text: /*
   * Copyright (c) 2015-2016 Fraunhofer FOKUS
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  // first an inline dependency, jquery.colorhelpers.js, we inline it here
  // for convenience
  
  /* Plugin for jQuery for working with colors.
   *
   * Version 1.1.
   *
   * Inspiration from jQuery color animation plugin by John Resig.
   *
   * Released under the MIT license by Ole Laursen, October 2009.
   *
   * Examples:
   *
   *   $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
   *   var c = $.color.extract($("#mydiv"), 'background-color');
   *   console.log(c.r, c.g, c.b, c.a);
   *   $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
   *
   * Note that .scale() and .add() return the same modified object
   * instead of making a new one.
   *
   * V. 1.1: Fix error handling so e.g. parsing an empty string does
   * produce a color rather than just crashing.
   */
  (function($){$.color={};$.color.make=function(r,g,b,a){var o={};o.r=r||0;o.g=g||0;o.b=b||0;o.a=a!=null?a:1;o.add=function(c,d){for(var i=0;i<c.length;++i)o[c.charAt(i)]+=d;return o.normalize()};o.scale=function(c,f){for(var i=0;i<c.length;++i)o[c.charAt(i)]*=f;return o.normalize()};o.toString=function(){if(o.a>=1){return"rgb("+[o.r,o.g,o.b].join(",")+")"}else{return"rgba("+[o.r,o.g,o.b,o.a].join(",")+")"}};o.normalize=function(){function clamp(min,value,max){return value<min?min:value>max?max:value}o.r=clamp(0,parseInt(o.r),255);o.g=clamp(0,parseInt(o.g),255);o.b=clamp(0,parseInt(o.b),255);o.a=clamp(0,o.a,1);return o};o.clone=function(){return $.color.make(o.r,o.b,o.g,o.a)};return o.normalize()};$.color.extract=function(elem,css){var c;do{c=elem.css(css).toLowerCase();if(c!=""&&c!="transparent")break;elem=elem.parent()}while(elem.length&&!$.nodeName(elem.get(0),"body"));if(c=="rgba(0, 0, 0, 0)")c="transparent";return $.color.parse(c)};$.color.parse=function(str){var res,m=$.color.make;if(res=/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(str))return m(parseInt(res[1],10),parseInt(res[2],10),parseInt(res[3],10));if(res=/rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(str))return m(parseInt(res[1],10),parseInt(res[2],10),parseInt(res[3],10),parseFloat(res[4]));if(res=/rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(str))return m(parseFloat(res[1])*2.55,parseFloat(res[2])*2.55,parseFloat(res[3])*2.55);if(res=/rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(str))return m(parseFloat(res[1])*2.55,parseFloat(res[2])*2.55,parseFloat(res[3])*2.55,parseFloat(res[4]));if(res=/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(str))return m(parseInt(res[1],16),parseInt(res[2],16),parseInt(res[3],16));if(res=/#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(str))return m(parseInt(res[1]+res[1],16),parseInt(res[2]+res[2],16),parseInt(res[3]+res[3],16));var name=$.trim(str).toLowerCase();if(name=="transparent")return m(255,255,255,0);else{res=lookupColors[name]||[0,0,0];return m(res[0],res[1],res[2])}};var lookupColors={aqua:[0,255,255],azure:[240,255,255],beige:[245,245,220],black:[0,0,0],blue:[0,0,255],brown:[165,42,42],cyan:[0,255,255],darkblue:[0,0,139],darkcyan:[0,139,139],darkgrey:[169,169,169],darkgreen:[0,100,0],darkkhaki:[189,183,107],darkmagenta:[139,0,139],darkolivegreen:[85,107,47],darkorange:[255,140,0],darkorchid:[153,50,204],darkred:[139,0,0],darksalmon:[233,150,122],darkviolet:[148,0,211],fuchsia:[255,0,255],gold:[255,215,0],green:[0,128,0],indigo:[75,0,130],khaki:[240,230,140],lightblue:[173,216,230],lightcyan:[224,255,255],lightgreen:[144,238,144],lightgrey:[211,211,211],lightpink:[255,182,193],lightyellow:[255,255,224],lime:[0,255,0],magenta:[255,0,255],maroon:[128,0,0],navy:[0,0,128],olive:[128,128,0],orange:[255,165,0],pink:[255,192,203],purple:[128,0,128],violet:[128,0,128],red:[255,0,0],silver:[192,192,192],white:[255,255,255],yellow:[255,255,0]}})(jQuery);
  
  // the actual Flot code
  (function($) {
  
  	// Cache the prototype hasOwnProperty for faster access
  
  	var hasOwnProperty = Object.prototype.hasOwnProperty;
  
      // A shim to provide 'detach' to jQuery versions prior to 1.4.  Using a DOM
      // operation produces the same effect as detach, i.e. removing the element
      // without touching its jQuery data.
  
      // Do not merge this into Flot 0.9, since it requires jQuery 1.4.4+.
  
      if (!$.fn.detach) {
          $.fn.detach = function() {
              return this.each(function() {
                  if (this.parentNode) {
                      this.parentNode.removeChild( this );
                  }
              });
          };
      }
  
  	///////////////////////////////////////////////////////////////////////////
  	// The Canvas object is a wrapper around an HTML5 <canvas> tag.
  	//
  	// @constructor
  	// @param {string} cls List of classes to apply to the canvas.
  	// @param {element} container Element onto which to append the canvas.
  	//
  	// Requiring a container is a little iffy, but unfortunately canvas
  	// operations don't work unless the canvas is attached to the DOM.
  
  	function Canvas(cls, container) {
  
  		var element = container.children("." + cls)[0];
  
  		if (element == null) {
  
  			element = document.createElement("canvas");
  			element.className = cls;
  
  			$(element).css({ direction: "ltr", position: "absolute", left: 0, top: 0 })
  				.appendTo(container);
  
  			// If HTML5 Canvas isn't available, fall back to [Ex|Flash]canvas
  
  			if (!element.getContext) {
  				if (window.G_vmlCanvasManager) {
  					element = window.G_vmlCanvasManager.initElement(element);
  				} else {
  					throw new Error("Canvas is not available. If you're using IE with a fall-back such as Excanvas, then there's either a mistake in your conditional include, or the page has no DOCTYPE and is rendering in Quirks Mode.");
  				}
  			}
  		}
  
  		this.element = element;
  
  		var context = this.context = element.getContext("2d");
  
  		// Determine the screen's ratio of physical to device-independent
  		// pixels.  This is the ratio between the canvas width that the browser
  		// advertises and the number of pixels actually present in that space.
  
  		// The iPhone 4, for example, has a device-independent width of 320px,
  		// but its screen is actually 640px wide.  It therefore has a pixel
  		// ratio of 2, while most normal devices have a ratio of 1.
  
  		var devicePixelRatio = window.devicePixelRatio || 1,
  			backingStoreRatio =
  				context.webkitBackingStorePixelRatio ||
  				context.mozBackingStorePixelRatio ||
  				context.msBackingStorePixelRatio ||
  				context.oBackingStorePixelRatio ||
  				context.backingStorePixelRatio || 1;
  
  		this.pixelRatio = devicePixelRatio / backingStoreRatio;
  
  		// Size the canvas to match the internal dimensions of its container
  
  		this.resize(container.width(), container.height());
  
  		// Collection of HTML div layers for text overlaid onto the canvas
  
  		this.textContainer = null;
  		this.text = {};
  
  		// Cache of text fragments and metrics, so we can avoid expensively
  		// re-calculating them when the plot is re-rendered in a loop.
  
  		this._textCache = {};
  	}
  
  	// Resizes the canvas to the given dimensions.
  	//
  	// @param {number} width New width of the canvas, in pixels.
  	// @param {number} width New height of the canvas, in pixels.
  
  	Canvas.prototype.resize = function(width, height) {
  
  		if (width <= 0 || height <= 0) {
  			throw new Error("Invalid dimensions for plot, width = " + width + ", height = " + height);
  		}
  
  		var element = this.element,
  			context = this.context,
  			pixelRatio = this.pixelRatio;
  
  		// Resize the canvas, increasing its density based on the display's
  		// pixel ratio; basically giving it more pixels without increasing the
  		// size of its element, to take advantage of the fact that retina
  		// displays have that many more pixels in the same advertised space.
  
  		// Resizing should reset the state (excanvas seems to be buggy though)
  
  		if (this.width != width) {
  			element.width = width * pixelRatio;
  			element.style.width = width + "px";
  			this.width = width;
  		}
  
  		if (this.height != height) {
  			element.height = height * pixelRatio;
  			element.style.height = height + "px";
  			this.height = height;
  		}
  
  		// Save the context, so we can reset in case we get replotted.  The
  		// restore ensure that we're really back at the initial state, and
  		// should be safe even if we haven't saved the initial state yet.
  
  		context.restore();
  		context.save();
  
  		// Scale the coordinate space to match the display density; so even though we
  		// may have twice as many pixels, we still want lines and other drawing to
  		// appear at the same size; the extra pixels will just make them crisper.
  
  		context.scale(pixelRatio, pixelRatio);
  	};
  
  	// Clears the entire canvas area, not including any overlaid HTML text
  
  	Canvas.prototype.clear = function() {
  		this.context.clearRect(0, 0, this.width, this.height);
  	};
  
  	// Finishes rendering the canvas, including managing the text overlay.
  
  	Canvas.prototype.render = function() {
  
  		var cache = this._textCache;
  
  		// For each text layer, add elements marked as active that haven't
  		// already been rendered, and remove those that are no longer active.
  
  		for (var layerKey in cache) {
  			if (hasOwnProperty.call(cache, layerKey)) {
  
  				var layer = this.getTextLayer(layerKey),
  					layerCache = cache[layerKey];
  
  				layer.hide();
  
  				for (var styleKey in layerCache) {
  					if (hasOwnProperty.call(layerCache, styleKey)) {
  						var styleCache = layerCache[styleKey];
  						for (var key in styleCache) {
  							if (hasOwnProperty.call(styleCache, key)) {
  
  								var positions = styleCache[key].positions;
  
  								for (var i = 0, position; position = positions[i]; i++) {
  									if (position.active) {
  										if (!position.rendered) {
  											layer.append(position.element);
  											position.rendered = true;
  										}
  									} else {
  										positions.splice(i--, 1);
  										if (position.rendered) {
  											position.element.detach();
  										}
  									}
  								}
  
  								if (positions.length == 0) {
  									delete styleCache[key];
  								}
  							}
  						}
  					}
  				}
  
  				layer.show();
  			}
  		}
  	};
  
  	// Creates (if necessary) and returns the text overlay container.
  	//
  	// @param {string} classes String of space-separated CSS classes used to
  	//     uniquely identify the text layer.
  	// @return {object} The jQuery-wrapped text-layer div.
  
  	Canvas.prototype.getTextLayer = function(classes) {
  
  		var layer = this.text[classes];
  
  		// Create the text layer if it doesn't exist
  
  		if (layer == null) {
  
  			// Create the text layer container, if it doesn't exist
  
  			if (this.textContainer == null) {
  				this.textContainer = $("<div class='flot-text'></div>")
  					.css({
  						position: "absolute",
  						top: 0,
  						left: 0,
  						bottom: 0,
  						right: 0,
  						'font-size': "smaller",
  						color: "#545454"
  					})
  					.insertAfter(this.element);
  			}
  
  			layer = this.text[classes] = $("<div></div>")
  				.addClass(classes)
  				.css({
  					position: "absolute",
  					top: 0,
  					left: 0,
  					bottom: 0,
  					right: 0
  				})
  				.appendTo(this.textContainer);
  		}
  
  		return layer;
  	};
  
  	// Creates (if necessary) and returns a text info object.
  	//
  	// The object looks like this:
  	//
  	// {
  	//     width: Width of the text's wrapper div.
  	//     height: Height of the text's wrapper div.
  	//     element: The jQuery-wrapped HTML div containing the text.
  	//     positions: Array of positions at which this text is drawn.
  	// }
  	//
  	// The positions array contains objects that look like this:
  	//
  	// {
  	//     active: Flag indicating whether the text should be visible.
  	//     rendered: Flag indicating whether the text is currently visible.
  	//     element: The jQuery-wrapped HTML div containing the text.
  	//     x: X coordinate at which to draw the text.
  	//     y: Y coordinate at which to draw the text.
  	// }
  	//
  	// Each position after the first receives a clone of the original element.
  	//
  	// The idea is that that the width, height, and general 'identity' of the
  	// text is constant no matter where it is placed; the placements are a
  	// secondary property.
  	//
  	// Canvas maintains a cache of recently-used text info objects; getTextInfo
  	// either returns the cached element or creates a new entry.
  	//
  	// @param {string} layer A string of space-separated CSS classes uniquely
  	//     identifying the layer containing this text.
  	// @param {string} text Text string to retrieve info for.
  	// @param {(string|object)=} font Either a string of space-separated CSS
  	//     classes or a font-spec object, defining the text's font and style.
  	// @param {number=} angle Angle at which to rotate the text, in degrees.
  	//     Angle is currently unused, it will be implemented in the future.
  	// @param {number=} width Maximum width of the text before it wraps.
  	// @return {object} a text info object.
  
  	Canvas.prototype.getTextInfo = function(layer, text, font, angle, width) {
  
  		var textStyle, layerCache, styleCache, info;
  
  		// Cast the value to a string, in case we were given a number or such
  
  		text = "" + text;
  
  		// If the font is a font-spec object, generate a CSS font definition
  
  		if (typeof font === "object") {
  			textStyle = font.style + " " + font.variant + " " + font.weight + " " + font.size + "px/" + font.lineHeight + "px " + font.family;
  		} else {
  			textStyle = font;
  		}
  
  		// Retrieve (or create) the cache for the text's layer and styles
  
  		layerCache = this._textCache[layer];
  
  		if (layerCache == null) {
  			layerCache = this._textCache[layer] = {};
  		}
  
  		styleCache = layerCache[textStyle];
  
  		if (styleCache == null) {
  			styleCache = layerCache[textStyle] = {};
  		}
  
  		info = styleCache[text];
  
  		// If we can't find a matching element in our cache, create a new one
  
  		if (info == null) {
  
  			var element = $("<div></div>").html(text)
  				.css({
  					position: "absolute",
  					'max-width': width,
  					top: -9999
  				})
  				.appendTo(this.getTextLayer(layer));
  
  			if (typeof font === "object") {
  				element.css({
  					font: textStyle,
  					color: font.color
  				});
  			} else if (typeof font === "string") {
  				element.addClass(font);
  			}
  
  			info = styleCache[text] = {
  				width: element.outerWidth(true),
  				height: element.outerHeight(true),
  				element: element,
  				positions: []
  			};
  
  			element.detach();
  		}
  
  		return info;
  	};
  
  	// Adds a text string to the canvas text overlay.
  	//
  	// The text isn't drawn immediately; it is marked as rendering, which will
  	// result in its addition to the canvas on the next render pass.
  	//
  	// @param {string} layer A string of space-separated CSS classes uniquely
  	//     identifying the layer containing this text.
  	// @param {number} x X coordinate at which to draw the text.
  	// @param {number} y Y coordinate at which to draw the text.
  	// @param {string} text Text string to draw.
  	// @param {(string|object)=} font Either a string of space-separated CSS
  	//     classes or a font-spec object, defining the text's font and style.
  	// @param {number=} angle Angle at which to rotate the text, in degrees.
  	//     Angle is currently unused, it will be implemented in the future.
  	// @param {number=} width Maximum width of the text before it wraps.
  	// @param {string=} halign Horizontal alignment of the text; either "left",
  	//     "center" or "right".
  	// @param {string=} valign Vertical alignment of the text; either "top",
  	//     "middle" or "bottom".
  
  	Canvas.prototype.addText = function(layer, x, y, text, font, angle, width, halign, valign) {
  
  		var info = this.getTextInfo(layer, text, font, angle, width),
  			positions = info.positions;
  
  		// Tweak the div's position to match the text's alignment
  
  		if (halign == "center") {
  			x -= info.width / 2;
  		} else if (halign == "right") {
  			x -= info.width;
  		}
  
  		if (valign == "middle") {
  			y -= info.height / 2;
  		} else if (valign == "bottom") {
  			y -= info.height;
  		}
  
  		// Determine whether this text already exists at this position.
  		// If so, mark it for inclusion in the next render pass.
  
  		for (var i = 0, position; position = positions[i]; i++) {
  			if (position.x == x && position.y == y) {
  				position.active = true;
  				return;
  			}
  		}
  
  		// If the text doesn't exist at this position, create a new entry
  
  		// For the very first position we'll re-use the original element,
  		// while for subsequent ones we'll clone it.
  
  		position = {
  			active: true,
  			rendered: false,
  			element: positions.length ? info.element.clone() : info.element,
  			x: x,
  			y: y
  		};
  
  		positions.push(position);
  
  		// Move the element to its final position within the container
  
  		position.element.css({
  			top: Math.round(y),
  			left: Math.round(x),
  			'text-align': halign	// In case the text wraps
  		});
  	};
  
  	// Removes one or more text strings from the canvas text overlay.
  	//
  	// If no parameters are given, all text within the layer is removed.
  	//
  	// Note that the text is not immediately removed; it is simply marked as
  	// inactive, which will result in its removal on the next render pass.
  	// This avoids the performance penalty for 'clear and redraw' behavior,
  	// where we potentially get rid of all text on a layer, but will likely
  	// add back most or all of it later, as when redrawing axes, for example.
  	//
  	// @param {string} layer A string of space-separated CSS classes uniquely
  	//     identifying the layer containing this text.
  	// @param {number=} x X coordinate of the text.
  	// @param {number=} y Y coordinate of the text.
  	// @param {string=} text Text string to remove.
  	// @param {(string|object)=} font Either a string of space-separated CSS
  	//     classes or a font-spec object, defining the text's font and style.
  	// @param {number=} angle Angle at which the text is rotated, in degrees.
  	//     Angle is currently unused, it will be implemented in the future.
  
  	Canvas.prototype.removeText = function(layer, x, y, text, font, angle) {
  		if (text == null) {
  			var layerCache = this._textCache[layer];
  			if (layerCache != null) {
  				for (var styleKey in layerCache) {
  					if (hasOwnProperty.call(layerCache, styleKey)) {
  						var styleCache = layerCache[styleKey];
  						for (var key in styleCache) {
  							if (hasOwnProperty.call(styleCache, key)) {
  								var positions = styleCache[key].positions;
  								for (var i = 0, position; position = positions[i]; i++) {
  									position.active = false;
  								}
  							}
  						}
  					}
  				}
  			}
  		} else {
  			var positions = this.getTextInfo(layer, text, font, angle).positions;
  			for (var i = 0, position; position = positions[i]; i++) {
  				if (position.x == x && position.y == y) {
  					position.active = false;
  				}
  			}
  		}
  	};
  
  	///////////////////////////////////////////////////////////////////////////
  	// The top-level container for the entire plot.
  
      function Plot(placeholder, data_, options_, plugins) {
          // data is on the form:
          //   [ series1, series2 ... ]
          // where series is either just the data as [ [x1, y1], [x2, y2], ... ]
          // or { data: [ [x1, y1], [x2, y2], ... ], label: "some label", ... }
  
          var series = [],
              options = {
                  // the color theme used for graphs
                  colors: ["#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed"],
                  legend: {
                      show: true,
                      noColumns: 1, // number of colums in legend table
                      labelFormatter: null, // fn: string -> string
                      labelBoxBorderColor: "#ccc", // border color for the little label boxes
                      container: null, // container (as jQuery object) to put legend in, null means default on top of graph
                      position: "ne", // position of default legend container within plot
                      margin: 5, // distance from grid edge to default legend container within plot
                      backgroundColor: null, // null means auto-detect
                      backgroundOpacity: 0.85, // set to 0 to avoid background
                      sorted: null    // default to no legend sorting
                  },
                  xaxis: {
                      show: null, // null = auto-detect, true = always, false = never
                      position: "bottom", // or "top"
                      mode: null, // null or "time"
                      font: null, // null (derived from CSS in placeholder) or object like { size: 11, lineHeight: 13, style: "italic", weight: "bold", family: "sans-serif", variant: "small-caps" }
                      color: null, // base color, labels, ticks
                      tickColor: null, // possibly different color of ticks, e.g. "rgba(0,0,0,0.15)"
                      transform: null, // null or f: number -> number to transform axis
                      inverseTransform: null, // if transform is set, this should be the inverse function
                      min: null, // min. value to show, null means set automatically
                      max: null, // max. value to show, null means set automatically
                      autoscaleMargin: null, // margin in % to add if auto-setting min/max
                      ticks: null, // either [1, 3] or [[1, "a"], 3] or (fn: axis info -> ticks) or app. number of ticks for auto-ticks
                      tickFormatter: null, // fn: number -> string
                      labelWidth: null, // size of tick labels in pixels
                      labelHeight: null,
                      reserveSpace: null, // whether to reserve space even if axis isn't shown
                      tickLength: null, // size in pixels of ticks, or "full" for whole line
                      alignTicksWithAxis: null, // axis number or null for no sync
                      tickDecimals: null, // no. of decimals, null means auto
                      tickSize: null, // number or [number, "unit"]
                      minTickSize: null // number or [number, "unit"]
                  },
                  yaxis: {
                      autoscaleMargin: 0.02,
                      position: "left" // or "right"
                  },
                  xaxes: [],
                  yaxes: [],
                  series: {
                      points: {
                          show: false,
                          radius: 3,
                          lineWidth: 2, // in pixels
                          fill: true,
                          fillColor: "#ffffff",
                          symbol: "circle" // or callback
                      },
                      lines: {
                          // we don't put in show: false so we can see
                          // whether lines were actively disabled
                          lineWidth: 2, // in pixels
                          fill: false,
                          fillColor: null,
                          steps: false
                          // Omit 'zero', so we can later default its value to
                          // match that of the 'fill' option.
                      },
                      bars: {
                          show: false,
                          lineWidth: 2, // in pixels
                          barWidth: 1, // in units of the x axis
                          fill: true,
                          fillColor: null,
                          align: "left", // "left", "right", or "center"
                          horizontal: false,
                          zero: true
                      },
                      shadowSize: 3,
                      highlightColor: null
                  },
                  grid: {
                      show: true,
                      aboveData: false,
                      color: "#545454", // primary color used for outline and labels
                      backgroundColor: null, // null for transparent, else color
                      borderColor: null, // set if different from the grid color
                      tickColor: null, // color for the ticks, e.g. "rgba(0,0,0,0.15)"
                      margin: 0, // distance from the canvas edge to the grid
                      labelMargin: 5, // in pixels
                      axisMargin: 8, // in pixels
                      borderWidth: 2, // in pixels
                      minBorderMargin: null, // in pixels, null means taken from points radius
                      markings: null, // array of ranges or fn: axes -> array of ranges
                      markingsColor: "#f4f4f4",
                      markingsLineWidth: 2,
                      // interactive stuff
                      clickable: false,
                      hoverable: false,
                      autoHighlight: true, // highlight in case mouse is near
                      mouseActiveRadius: 10 // how far the mouse can be away to activate an item
                  },
                  interaction: {
                      redrawOverlayInterval: 1000/60 // time between updates, -1 means in same flow
                  },
                  hooks: {}
              },
          surface = null,     // the canvas for the plot itself
          overlay = null,     // canvas for interactive stuff on top of plot
          eventHolder = null, // jQuery object that events should be bound to
          ctx = null, octx = null,
          xaxes = [], yaxes = [],
          plotOffset = { left: 0, right: 0, top: 0, bottom: 0},
          plotWidth = 0, plotHeight = 0,
          hooks = {
              processOptions: [],
              processRawData: [],
              processDatapoints: [],
              processOffset: [],
              drawBackground: [],
              drawSeries: [],
              draw: [],
              bindEvents: [],
              drawOverlay: [],
              shutdown: []
          },
          plot = this;
  
          // public functions
          plot.setData = setData;
          plot.setupGrid = setupGrid;
          plot.draw = draw;
          plot.getPlaceholder = function() { return placeholder; };
          plot.getCanvas = function() { return surface.element; };
          plot.getPlotOffset = function() { return plotOffset; };
          plot.width = function () { return plotWidth; };
          plot.height = function () { return plotHeight; };
          plot.offset = function () {
              var o = eventHolder.offset();
              o.left += plotOffset.left;
              o.top += plotOffset.top;
              return o;
          };
          plot.getData = function () { return series; };
          plot.getAxes = function () {
              var res = {}, i;
              $.each(xaxes.concat(yaxes), function (_, axis) {
                  if (axis)
                      res[axis.direction + (axis.n != 1 ? axis.n : "") + "axis"] = axis;
              });
              return res;
          };
          plot.getXAxes = function () { return xaxes; };
          plot.getYAxes = function () { return yaxes; };
          plot.c2p = canvasToAxisCoords;
          plot.p2c = axisToCanvasCoords;
          plot.getOptions = function () { return options; };
          plot.highlight = highlight;
          plot.unhighlight = unhighlight;
          plot.triggerRedrawOverlay = triggerRedrawOverlay;
          plot.pointOffset = function(point) {
              return {
                  left: parseInt(xaxes[axisNumber(point, "x") - 1].p2c(+point.x) + plotOffset.left, 10),
                  top: parseInt(yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top, 10)
              };
          };
          plot.shutdown = shutdown;
          plot.destroy = function () {
              shutdown();
              placeholder.removeData("plot").empty();
  
              series = [];
              options = null;
              surface = null;
              overlay = null;
              eventHolder = null;
              ctx = null;
              octx = null;
              xaxes = [];
              yaxes = [];
              hooks = null;
              highlights = [];
              plot = null;
          };
          plot.resize = function () {
          	var width = placeholder.width(),
          		height = placeholder.height();
              surface.resize(width, height);
              overlay.resize(width, height);
          };
  
          // public attributes
          plot.hooks = hooks;
  
          // initialize
          initPlugins(plot);
          parseOptions(options_);
          setupCanvases();
          setData(data_);
          setupGrid();
          draw();
          bindEvents();
  
  
          function executeHooks(hook, args) {
              args = [plot].concat(args);
              for (var i = 0; i < hook.length; ++i)
                  hook[i].apply(this, args);
          }
  
          function initPlugins() {
  
              // References to key classes, allowing plugins to modify them
  
              var classes = {
                  Canvas: Canvas
              };
  
              for (var i = 0; i < plugins.length; ++i) {
                  var p = plugins[i];
                  p.init(plot, classes);
                  if (p.options)
                      $.extend(true, options, p.options);
              }
          }
  
          function parseOptions(opts) {
  
              $.extend(true, options, opts);
  
              // $.extend merges arrays, rather than replacing them.  When less
              // colors are provided than the size of the default palette, we
              // end up with those colors plus the remaining defaults, which is
              // not expected behavior; avoid it by replacing them here.
  
              if (opts && opts.colors) {
              	options.colors = opts.colors;
              }
  
              if (options.xaxis.color == null)
                  options.xaxis.color = $.color.parse(options.grid.color).scale('a', 0.22).toString();
              if (options.yaxis.color == null)
                  options.yaxis.color = $.color.parse(options.grid.color).scale('a', 0.22).toString();
  
              if (options.xaxis.tickColor == null) // grid.tickColor for back-compatibility
                  options.xaxis.tickColor = options.grid.tickColor || options.xaxis.color;
              if (options.yaxis.tickColor == null) // grid.tickColor for back-compatibility
                  options.yaxis.tickColor = options.grid.tickColor || options.yaxis.color;
  
              if (options.grid.borderColor == null)
                  options.grid.borderColor = options.grid.color;
              if (options.grid.tickColor == null)
                  options.grid.tickColor = $.color.parse(options.grid.color).scale('a', 0.22).toString();
  
              // Fill in defaults for axis options, including any unspecified
              // font-spec fields, if a font-spec was provided.
  
              // If no x/y axis options were provided, create one of each anyway,
              // since the rest of the code assumes that they exist.
  
              var i, axisOptions, axisCount,
                  fontSize = placeholder.css("font-size"),
                  fontSizeDefault = fontSize ? +fontSize.replace("px", "") : 13,
                  fontDefaults = {
                      style: placeholder.css("font-style"),
                      size: Math.round(0.8 * fontSizeDefault),
                      variant: placeholder.css("font-variant"),
                      weight: placeholder.css("font-weight"),
                      family: placeholder.css("font-family")
                  };
  
              axisCount = options.xaxes.length || 1;
              for (i = 0; i < axisCount; ++i) {
  
                  axisOptions = options.xaxes[i];
                  if (axisOptions && !axisOptions.tickColor) {
                      axisOptions.tickColor = axisOptions.color;
                  }
  
                  axisOptions = $.extend(true, {}, options.xaxis, axisOptions);
                  options.xaxes[i] = axisOptions;
  
                  if (axisOptions.font) {
                      axisOptions.font = $.extend({}, fontDefaults, axisOptions.font);
                      if (!axisOptions.font.color) {
                          axisOptions.font.color = axisOptions.color;
                      }
                      if (!axisOptions.font.lineHeight) {
                          axisOptions.font.lineHeight = Math.round(axisOptions.font.size * 1.15);
                      }
                  }
              }
  
              axisCount = options.yaxes.length || 1;
              for (i = 0; i < axisCount; ++i) {
  
                  axisOptions = options.yaxes[i];
                  if (axisOptions && !axisOptions.tickColor) {
                      axisOptions.tickColor = axisOptions.color;
                  }
  
                  axisOptions = $.extend(true, {}, options.yaxis, axisOptions);
                  options.yaxes[i] = axisOptions;
  
                  if (axisOptions.font) {
                      axisOptions.font = $.extend({}, fontDefaults, axisOptions.font);
                      if (!axisOptions.font.color) {
                          axisOptions.font.color = axisOptions.color;
                      }
                      if (!axisOptions.font.lineHeight) {
                          axisOptions.font.lineHeight = Math.round(axisOptions.font.size * 1.15);
                      }
                  }
              }
  
              // backwards compatibility, to be removed in future
              if (options.xaxis.noTicks && options.xaxis.ticks == null)
                  options.xaxis.ticks = options.xaxis.noTicks;
              if (options.yaxis.noTicks && options.yaxis.ticks == null)
                  options.yaxis.ticks = options.yaxis.noTicks;
              if (options.x2axis) {
                  options.xaxes[1] = $.extend(true, {}, options.xaxis, options.x2axis);
                  options.xaxes[1].position = "top";
                  // Override the inherit to allow the axis to auto-scale
                  if (options.x2axis.min == null) {
                      options.xaxes[1].min = null;
                  }
                  if (options.x2axis.max == null) {
                      options.xaxes[1].max = null;
                  }
              }
              if (options.y2axis) {
                  options.yaxes[1] = $.extend(true, {}, options.yaxis, options.y2axis);
                  options.yaxes[1].position = "right";
                  // Override the inherit to allow the axis to auto-scale
                  if (options.y2axis.min == null) {
                      options.yaxes[1].min = null;
                  }
                  if (options.y2axis.max == null) {
                      options.yaxes[1].max = null;
                  }
              }
              if (options.grid.coloredAreas)
                  options.grid.markings = options.grid.coloredAreas;
              if (options.grid.coloredAreasColor)
                  options.grid.markingsColor = options.grid.coloredAreasColor;
              if (options.lines)
                  $.extend(true, options.series.lines, options.lines);
              if (options.points)
                  $.extend(true, options.series.points, options.points);
              if (options.bars)
                  $.extend(true, options.series.bars, options.bars);
              if (options.shadowSize != null)
                  options.series.shadowSize = options.shadowSize;
              if (options.highlightColor != null)
                  options.series.highlightColor = options.highlightColor;
  
              // save options on axes for future reference
              for (i = 0; i < options.xaxes.length; ++i)
                  getOrCreateAxis(xaxes, i + 1).options = options.xaxes[i];
              for (i = 0; i < options.yaxes.length; ++i)
                  getOrCreateAxis(yaxes, i + 1).options = options.yaxes[i];
  
              // add hooks from options
              for (var n in hooks)
                  if (options.hooks[n] && options.hooks[n].length)
                      hooks[n] = hooks[n].concat(options.hooks[n]);
  
              executeHooks(hooks.processOptions, [options]);
          }
  
          function setData(d) {
              series = parseData(d);
              fillInSeriesOptions();
              processData();
          }
  
          function parseData(d) {
              var res = [];
              for (var i = 0; i < d.length; ++i) {
                  var s = $.extend(true, {}, options.series);
  
                  if (d[i].data != null) {
                      s.data = d[i].data; // move the data instead of deep-copy
                      delete d[i].data;
  
                      $.extend(true, s, d[i]);
  
                      d[i].data = s.data;
                  }
                  else
                      s.data = d[i];
                  res.push(s);
              }
  
              return res;
          }
  
          function axisNumber(obj, coord) {
              var a = obj[coord + "axis"];
              if (typeof a == "object") // if we got a real axis, extract number
                  a = a.n;
              if (typeof a != "number")
                  a = 1; // default to first axis
              return a;
          }
  
          function allAxes() {
              // return flat array without annoying null entries
              return $.grep(xaxes.concat(yaxes), function (a) { return a; });
          }
  
          function canvasToAxisCoords(pos) {
              // return an object with x/y corresponding to all used axes
              var res = {}, i, axis;
              for (i = 0; i < xaxes.length; ++i) {
                  axis = xaxes[i];
                  if (axis && axis.used)
                      res["x" + axis.n] = axis.c2p(pos.left);
              }
  
              for (i = 0; i < yaxes.length; ++i) {
                  axis = yaxes[i];
                  if (axis && axis.used)
                      res["y" + axis.n] = axis.c2p(pos.top);
              }
  
              if (res.x1 !== undefined)
                  res.x = res.x1;
              if (res.y1 !== undefined)
                  res.y = res.y1;
  
              return res;
          }
  
          function axisToCanvasCoords(pos) {
              // get canvas coords from the first pair of x/y found in pos
              var res = {}, i, axis, key;
  
              for (i = 0; i < xaxes.length; ++i) {
                  axis = xaxes[i];
                  if (axis && axis.used) {
                      key = "x" + axis.n;
                      if (pos[key] == null && axis.n == 1)
                          key = "x";
  
                      if (pos[key] != null) {
                          res.left = axis.p2c(pos[key]);
                          break;
                      }
                  }
              }
  
              for (i = 0; i < yaxes.length; ++i) {
                  axis = yaxes[i];
                  if (axis && axis.used) {
                      key = "y" + axis.n;
                      if (pos[key] == null && axis.n == 1)
                          key = "y";
  
                      if (pos[key] != null) {
                          res.top = axis.p2c(pos[key]);
                          break;
                      }
                  }
              }
  
              return res;
          }
  
          function getOrCreateAxis(axes, number) {
              if (!axes[number - 1])
                  axes[number - 1] = {
                      n: number, // save the number for future reference
                      direction: axes == xaxes ? "x" : "y",
                      options: $.extend(true, {}, axes == xaxes ? options.xaxis : options.yaxis)
                  };
  
              return axes[number - 1];
          }
  
          function fillInSeriesOptions() {
  
              var neededColors = series.length, maxIndex = -1, i;
  
              // Subtract the number of series that already have fixed colors or
              // color indexes from the number that we still need to generate.
  
              for (i = 0; i < series.length; ++i) {
                  var sc = series[i].color;
                  if (sc != null) {
                      neededColors--;
                      if (typeof sc == "number" && sc > maxIndex) {
                          maxIndex = sc;
                      }
                  }
              }
  
              // If any of the series have fixed color indexes, then we need to
              // generate at least as many colors as the highest index.
  
              if (neededColors <= maxIndex) {
                  neededColors = maxIndex + 1;
              }
  
              // Generate all the colors, using first the option colors and then
              // variations on those colors once they're exhausted.
  
              var c, colors = [], colorPool = options.colors,
                  colorPoolSize = colorPool.length, variation = 0;
  
              for (i = 0; i < neededColors; i++) {
  
                  c = $.color.parse(colorPool[i % colorPoolSize] || "#666");
  
                  // Each time we exhaust the colors in the pool we adjust
                  // a scaling factor used to produce more variations on
                  // those colors. The factor alternates negative/positive
                  // to produce lighter/darker colors.
  
                  // Reset the variation after every few cycles, or else
                  // it will end up producing only white or black colors.
  
                  if (i % colorPoolSize == 0 && i) {
                      if (variation >= 0) {
                          if (variation < 0.5) {
                              variation = -variation - 0.2;
                          } else variation = 0;
                      } else variation = -variation;
                  }
  
                  colors[i] = c.scale('rgb', 1 + variation);
              }
  
              // Finalize the series options, filling in their colors
  
              var colori = 0, s;
              for (i = 0; i < series.length; ++i) {
                  s = series[i];
  
                  // assign colors
                  if (s.color == null) {
                      s.color = colors[colori].toString();
                      ++colori;
                  }
                  else if (typeof s.color == "number")
                      s.color = colors[s.color].toString();
  
                  // turn on lines automatically in case nothing is set
                  if (s.lines.show == null) {
                      var v, show = true;
                      for (v in s)
                          if (s[v] && s[v].show) {
                              show = false;
                              break;
                          }
                      if (show)
                          s.lines.show = true;
                  }
  
                  // If nothing was provided for lines.zero, default it to match
                  // lines.fill, since areas by default should extend to zero.
  
                  if (s.lines.zero == null) {
                      s.lines.zero = !!s.lines.fill;
                  }
  
                  // setup axes
                  s.xaxis = getOrCreateAxis(xaxes, axisNumber(s, "x"));
                  s.yaxis = getOrCreateAxis(yaxes, axisNumber(s, "y"));
              }
          }
  
          function processData() {
              var topSentry = Number.POSITIVE_INFINITY,
                  bottomSentry = Number.NEGATIVE_INFINITY,
                  fakeInfinity = Number.MAX_VALUE,
                  i, j, k, m, length,
                  s, points, ps, x, y, axis, val, f, p,
                  data, format;
  
              function updateAxis(axis, min, max) {
                  if (min < axis.datamin && min != -fakeInfinity)
                      axis.datamin = min;
                  if (max > axis.datamax && max != fakeInfinity)
                      axis.datamax = max;
              }
  
              $.each(allAxes(), function (_, axis) {
                  // init axis
                  axis.datamin = topSentry;
                  axis.datamax = bottomSentry;
                  axis.used = false;
              });
  
              for (i = 0; i < series.length; ++i) {
                  s = series[i];
                  s.datapoints = { points: [] };
  
                  executeHooks(hooks.processRawData, [ s, s.data, s.datapoints ]);
              }
  
              // first pass: clean and copy data
              for (i = 0; i < series.length; ++i) {
                  s = series[i];
  
                  data = s.data;
                  format = s.datapoints.format;
  
                  if (!format) {
                      format = [];
                      // find out how to copy
                      format.push({ x: true, number: true, required: true });
                      format.push({ y: true, number: true, required: true });
  
                      if (s.bars.show || (s.lines.show && s.lines.fill)) {
                          var autoscale = !!((s.bars.show && s.bars.zero) || (s.lines.show && s.lines.zero));
                          format.push({ y: true, number: true, required: false, defaultValue: 0, autoscale: autoscale });
                          if (s.bars.horizontal) {
                              delete format[format.length - 1].y;
                              format[format.length - 1].x = true;
                          }
                      }
  
                      s.datapoints.format = format;
                  }
  
                  if (s.datapoints.pointsize != null)
                      continue; // already filled in
  
                  s.datapoints.pointsize = format.length;
  
                  ps = s.datapoints.pointsize;
                  points = s.datapoints.points;
  
                  var insertSteps = s.lines.show && s.lines.steps;
                  s.xaxis.used = s.yaxis.used = true;
  
                  for (j = k = 0; j < data.length; ++j, k += ps) {
                      p = data[j];
  
                      var nullify = p == null;
                      if (!nullify) {
                          for (m = 0; m < ps; ++m) {
                              val = p[m];
                              f = format[m];
  
                              if (f) {
                                  if (f.number && val != null) {
                                      val = +val; // convert to number
                                      if (isNaN(val))
                                          val = null;
                                      else if (val == Infinity)
                                          val = fakeInfinity;
                                      else if (val == -Infinity)
                                          val = -fakeInfinity;
                                  }
  
                                  if (val == null) {
                                      if (f.required)
                                          nullify = true;
  
                                      if (f.defaultValue != null)
                                          val = f.defaultValue;
                                  }
                              }
  
                              points[k + m] = val;
                          }
                      }
  
                      if (nullify) {
                          for (m = 0; m < ps; ++m) {
                              val = points[k + m];
                              if (val != null) {
                                  f = format[m];
                                  // extract min/max info
                                  if (f.autoscale !== false) {
                                      if (f.x) {
                                          updateAxis(s.xaxis, val, val);
                                      }
                                      if (f.y) {
                                          updateAxis(s.yaxis, val, val);
                                      }
                                  }
                              }
                              points[k + m] = null;
                          }
                      }
                      else {
                          // a little bit of line specific stuff that
                          // perhaps shouldn't be here, but lacking
                          // better means...
                          if (insertSteps && k > 0
                              && points[k - ps] != null
                              && points[k - ps] != points[k]
                              && points[k - ps + 1] != points[k + 1]) {
                              // copy the point to make room for a middle point
                              for (m = 0; m < ps; ++m)
                                  points[k + ps + m] = points[k + m];
  
                              // middle point has same y
                              points[k + 1] = points[k - ps + 1];
  
                              // we've added a point, better reflect that
                              k += ps;
                          }
                      }
                  }
              }
  
              // give the hooks a chance to run
              for (i = 0; i < series.length; ++i) {
                  s = series[i];
  
                  executeHooks(hooks.processDatapoints, [ s, s.datapoints]);
              }
  
              // second pass: find datamax/datamin for auto-scaling
              for (i = 0; i < series.length; ++i) {
                  s = series[i];
                  points = s.datapoints.points;
                  ps = s.datapoints.pointsize;
                  format = s.datapoints.format;
  
                  var xmin = topSentry, ymin = topSentry,
                      xmax = bottomSentry, ymax = bottomSentry;
  
                  for (j = 0; j < points.length; j += ps) {
                      if (points[j] == null)
                          continue;
  
                      for (m = 0; m < ps; ++m) {
                          val = points[j + m];
                          f = format[m];
                          if (!f || f.autoscale === false || val == fakeInfinity || val == -fakeInfinity)
                              continue;
  
                          if (f.x) {
                              if (val < xmin)
                                  xmin = val;
                              if (val > xmax)
                                  xmax = val;
                          }
                          if (f.y) {
                              if (val < ymin)
                                  ymin = val;
                              if (val > ymax)
                                  ymax = val;
                          }
                      }
                  }
  
                  if (s.bars.show) {
                      // make sure we got room for the bar on the dancing floor
                      var delta;
  
                      switch (s.bars.align) {
                          case "left":
                              delta = 0;
                              break;
                          case "right":
                              delta = -s.bars.barWidth;
                              break;
                          default:
                              delta = -s.bars.barWidth / 2;
                      }
  
                      if (s.bars.horizontal) {
                          ymin += delta;
                          ymax += delta + s.bars.barWidth;
                      }
                      else {
                          xmin += delta;
                          xmax += delta + s.bars.barWidth;
                      }
                  }
  
                  updateAxis(s.xaxis, xmin, xmax);
                  updateAxis(s.yaxis, ymin, ymax);
              }
  
              $.each(allAxes(), function (_, axis) {
                  if (axis.datamin == topSentry)
                      axis.datamin = null;
                  if (axis.datamax == bottomSentry)
                      axis.datamax = null;
              });
          }
  
          function setupCanvases() {
  
              // Make sure the placeholder is clear of everything except canvases
              // from a previous plot in this container that we'll try to re-use.
  
              placeholder.css("padding", 0) // padding messes up the positioning
                  .children().filter(function(){
                      return !$(this).hasClass("flot-overlay") && !$(this).hasClass('flot-base');
                  }).remove();
  
              if (placeholder.css("position") == 'static')
                  placeholder.css("position", "relative"); // for positioning labels and overlay
  
              surface = new Canvas("flot-base", placeholder);
              overlay = new Canvas("flot-overlay", placeholder); // overlay canvas for interactive features
  
              ctx = surface.context;
              octx = overlay.context;
  
              // define which element we're listening for events on
              eventHolder = $(overlay.element).unbind();
  
              // If we're re-using a plot object, shut down the old one
  
              var existing = placeholder.data("plot");
  
              if (existing) {
                  existing.shutdown();
                  overlay.clear();
              }
  
              // save in case we get replotted
              placeholder.data("plot", plot);
          }
  
          function bindEvents() {
              // bind events
              if (options.grid.hoverable) {
                  eventHolder.mousemove(onMouseMove);
  
                  // Use bind, rather than .mouseleave, because we officially
                  // still support jQuery 1.2.6, which doesn't define a shortcut
                  // for mouseenter or mouseleave.  This was a bug/oversight that
                  // was fixed somewhere around 1.3.x.  We can return to using
                  // .mouseleave when we drop support for 1.2.6.
  
                  eventHolder.bind("mouseleave", onMouseLeave);
              }
  
              if (options.grid.clickable)
                  eventHolder.click(onClick);
  
              executeHooks(hooks.bindEvents, [eventHolder]);
          }
  
          function shutdown() {
              if (redrawTimeout)
                  clearTimeout(redrawTimeout);
  
              eventHolder.unbind("mousemove", onMouseMove);
              eventHolder.unbind("mouseleave", onMouseLeave);
              eventHolder.unbind("click", onClick);
  
              executeHooks(hooks.shutdown, [eventHolder]);
          }
  
          function setTransformationHelpers(axis) {
              // set helper functions on the axis, assumes plot area
              // has been computed already
  
              function identity(x) { return x; }
  
              var s, m, t = axis.options.transform || identity,
                  it = axis.options.inverseTransform;
  
              // precompute how much the axis is scaling a point
              // in canvas space
              if (axis.direction == "x") {
                  s = axis.scale = plotWidth / Math.abs(t(axis.max) - t(axis.min));
                  m = Math.min(t(axis.max), t(axis.min));
              }
              else {
                  s = axis.scale = plotHeight / Math.abs(t(axis.max) - t(axis.min));
                  s = -s;
                  m = Math.max(t(axis.max), t(axis.min));
              }
  
              // data point to canvas coordinate
              if (t == identity) // slight optimization
                  axis.p2c = function (p) { return (p - m) * s; };
              else
                  axis.p2c = function (p) { return (t(p) - m) * s; };
              // canvas coordinate to data point
              if (!it)
                  axis.c2p = function (c) { return m + c / s; };
              else
                  axis.c2p = function (c) { return it(m + c / s); };
          }
  
          function measureTickLabels(axis) {
  
              var opts = axis.options,
                  ticks = axis.ticks || [],
                  labelWidth = opts.labelWidth || 0,
                  labelHeight = opts.labelHeight || 0,
                  maxWidth = labelWidth || (axis.direction == "x" ? Math.floor(surface.width / (ticks.length || 1)) : null),
                  legacyStyles = axis.direction + "Axis " + axis.direction + axis.n + "Axis",
                  layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis " + legacyStyles,
                  font = opts.font || "flot-tick-label tickLabel";
  
              for (var i = 0; i < ticks.length; ++i) {
  
                  var t = ticks[i];
  
                  if (!t.label)
                      continue;
  
                  var info = surface.getTextInfo(layer, t.label, font, null, maxWidth);
  
                  labelWidth = Math.max(labelWidth, info.width);
                  labelHeight = Math.max(labelHeight, info.height);
              }
  
              axis.labelWidth = opts.labelWidth || labelWidth;
              axis.labelHeight = opts.labelHeight || labelHeight;
          }
  
          function allocateAxisBoxFirstPhase(axis) {
              // find the bounding box of the axis by looking at label
              // widths/heights and ticks, make room by diminishing the
              // plotOffset; this first phase only looks at one
              // dimension per axis, the other dimension depends on the
              // other axes so will have to wait
  
              var lw = axis.labelWidth,
                  lh = axis.labelHeight,
                  pos = axis.options.position,
                  isXAxis = axis.direction === "x",
                  tickLength = axis.options.tickLength,
                  axisMargin = options.grid.axisMargin,
                  padding = options.grid.labelMargin,
                  innermost = true,
                  outermost = true,
                  first = true,
                  found = false;
  
              // Determine the axis's position in its direction and on its side
  
              $.each(isXAxis ? xaxes : yaxes, function(i, a) {
                  if (a && (a.show || a.reserveSpace)) {
                      if (a === axis) {
                          found = true;
                      } else if (a.options.position === pos) {
                          if (found) {
                              outermost = false;
                          } else {
                              innermost = false;
                          }
                      }
                      if (!found) {
                          first = false;
                      }
                  }
              });
  
              // The outermost axis on each side has no margin
  
              if (outermost) {
                  axisMargin = 0;
              }
  
              // The ticks for the first axis in each direction stretch across
  
              if (tickLength == null) {
                  tickLength = first ? "full" : 5;
              }
  
              if (!isNaN(+tickLength))
                  padding += +tickLength;
  
              if (isXAxis) {
                  lh += padding;
  
                  if (pos == "bottom") {
                      plotOffset.bottom += lh + axisMargin;
                      axis.box = { top: surface.height - plotOffset.bottom, height: lh };
                  }
                  else {
                      axis.box = { top: plotOffset.top + axisMargin, height: lh };
                      plotOffset.top += lh + axisMargin;
                  }
              }
              else {
                  lw += padding;
  
                  if (pos == "left") {
                      axis.box = { left: plotOffset.left + axisMargin, width: lw };
                      plotOffset.left += lw + axisMargin;
                  }
                  else {
                      plotOffset.right += lw + axisMargin;
                      axis.box = { left: surface.width - plotOffset.right, width: lw };
                  }
              }
  
               // save for future reference
              axis.position = pos;
              axis.tickLength = tickLength;
              axis.box.padding = padding;
              axis.innermost = innermost;
          }
  
          function allocateAxisBoxSecondPhase(axis) {
              // now that all axis boxes have been placed in one
              // dimension, we can set the remaining dimension coordinates
              if (axis.direction == "x") {
                  axis.box.left = plotOffset.left - axis.labelWidth / 2;
                  axis.box.width = surface.width - plotOffset.left - plotOffset.right + axis.labelWidth;
              }
              else {
                  axis.box.top = plotOffset.top - axis.labelHeight / 2;
                  axis.box.height = surface.height - plotOffset.bottom - plotOffset.top + axis.labelHeight;
              }
          }
  
          function adjustLayoutForThingsStickingOut() {
              // possibly adjust plot offset to ensure everything stays
              // inside the canvas and isn't clipped off
  
              var minMargin = options.grid.minBorderMargin,
                  axis, i;
  
              // check stuff from the plot (FIXME: this should just read
              // a value from the series, otherwise it's impossible to
              // customize)
              if (minMargin == null) {
                  minMargin = 0;
                  for (i = 0; i < series.length; ++i)
                      minMargin = Math.max(minMargin, 2 * (series[i].points.radius + series[i].points.lineWidth/2));
              }
  
              var margins = {
                  left: minMargin,
                  right: minMargin,
                  top: minMargin,
                  bottom: minMargin
              };
  
              // check axis labels, note we don't check the actual
              // labels but instead use the overall width/height to not
              // jump as much around with replots
              $.each(allAxes(), function (_, axis) {
                  if (axis.reserveSpace && axis.ticks && axis.ticks.length) {
                      if (axis.direction === "x") {
                          margins.left = Math.max(margins.left, axis.labelWidth / 2);
                          margins.right = Math.max(margins.right, axis.labelWidth / 2);
                      } else {
                          margins.bottom = Math.max(margins.bottom, axis.labelHeight / 2);
                          margins.top = Math.max(margins.top, axis.labelHeight / 2);
                      }
                  }
              });
  
              plotOffset.left = Math.ceil(Math.max(margins.left, plotOffset.left));
              plotOffset.right = Math.ceil(Math.max(margins.right, plotOffset.right));
              plotOffset.top = Math.ceil(Math.max(margins.top, plotOffset.top));
              plotOffset.bottom = Math.ceil(Math.max(margins.bottom, plotOffset.bottom));
          }
  
          function setupGrid() {
              var i, axes = allAxes(), showGrid = options.grid.show;
  
              // Initialize the plot's offset from the edge of the canvas
  
              for (var a in plotOffset) {
                  var margin = options.grid.margin || 0;
                  plotOffset[a] = typeof margin == "number" ? margin : margin[a] || 0;
              }
  
              executeHooks(hooks.processOffset, [plotOffset]);
  
              // If the grid is visible, add its border width to the offset
  
              for (var a in plotOffset) {
                  if(typeof(options.grid.borderWidth) == "object") {
                      plotOffset[a] += showGrid ? options.grid.borderWidth[a] : 0;
                  }
                  else {
                      plotOffset[a] += showGrid ? options.grid.borderWidth : 0;
                  }
              }
  
              $.each(axes, function (_, axis) {
                  var axisOpts = axis.options;
                  axis.show = axisOpts.show == null ? axis.used : axisOpts.show;
                  axis.reserveSpace = axisOpts.reserveSpace == null ? axis.show : axisOpts.reserveSpace;
                  setRange(axis);
              });
  
              if (showGrid) {
  
                  var allocatedAxes = $.grep(axes, function (axis) {
                      return axis.show || axis.reserveSpace;
                  });
  
                  $.each(allocatedAxes, function (_, axis) {
                      // make the ticks
                      setupTickGeneration(axis);
                      setTicks(axis);
                      snapRangeToTicks(axis, axis.ticks);
                      // find labelWidth/Height for axis
                      measureTickLabels(axis);
                  });
  
                  // with all dimensions calculated, we can compute the
                  // axis bounding boxes, start from the outside
                  // (reverse order)
                  for (i = allocatedAxes.length - 1; i >= 0; --i)
                      allocateAxisBoxFirstPhase(allocatedAxes[i]);
  
                  // make sure we've got enough space for things that
                  // might stick out
                  adjustLayoutForThingsStickingOut();
  
                  $.each(allocatedAxes, function (_, axis) {
                      allocateAxisBoxSecondPhase(axis);
                  });
              }
  
              plotWidth = surface.width - plotOffset.left - plotOffset.right;
              plotHeight = surface.height - plotOffset.bottom - plotOffset.top;
  
              // now we got the proper plot dimensions, we can compute the scaling
              $.each(axes, function (_, axis) {
                  setTransformationHelpers(axis);
              });
  
              if (showGrid) {
                  drawAxisLabels();
              }
  
              insertLegend();
          }
  
          function setRange(axis) {
              var opts = axis.options,
                  min = +(opts.min != null ? opts.min : axis.datamin),
                  max = +(opts.max != null ? opts.max : axis.datamax),
                  delta = max - min;
  
              if (delta == 0.0) {
                  // degenerate case
                  var widen = max == 0 ? 1 : 0.01;
  
                  if (opts.min == null)
                      min -= widen;
                  // always widen max if we couldn't widen min to ensure we
                  // don't fall into min == max which doesn't work
                  if (opts.max == null || opts.min != null)
                      max += widen;
              }
              else {
                  // consider autoscaling
                  var margin = opts.autoscaleMargin;
                  if (margin != null) {
                      if (opts.min == null) {
                          min -= delta * margin;
                          // make sure we don't go below zero if all values
                          // are positive
                          if (min < 0 && axis.datamin != null && axis.datamin >= 0)
                              min = 0;
                      }
                      if (opts.max == null) {
                          max += delta * margin;
                          if (max > 0 && axis.datamax != null && axis.datamax <= 0)
                              max = 0;
                      }
                  }
              }
              axis.min = min;
              axis.max = max;
          }
  
          function setupTickGeneration(axis) {
              var opts = axis.options;
  
              // estimate number of ticks
              var noTicks;
              if (typeof opts.ticks == "number" && opts.ticks > 0)
                  noTicks = opts.ticks;
              else
                  // heuristic based on the model a*sqrt(x) fitted to
                  // some data points that seemed reasonable
                  noTicks = 0.3 * Math.sqrt(axis.direction == "x" ? surface.width : surface.height);
  
              var delta = (axis.max - axis.min) / noTicks,
                  dec = -Math.floor(Math.log(delta) / Math.LN10),
                  maxDec = opts.tickDecimals;
  
              if (maxDec != null && dec > maxDec) {
                  dec = maxDec;
              }
  
              var magn = Math.pow(10, -dec),
                  norm = delta / magn, // norm is between 1.0 and 10.0
                  size;
  
              if (norm < 1.5) {
                  size = 1;
              } else if (norm < 3) {
                  size = 2;
                  // special case for 2.5, requires an extra decimal
                  if (norm > 2.25 && (maxDec == null || dec + 1 <= maxDec)) {
                      size = 2.5;
                      ++dec;
                  }
              } else if (norm < 7.5) {
                  size = 5;
              } else {
                  size = 10;
              }
  
              size *= magn;
  
              if (opts.minTickSize != null && size < opts.minTickSize) {
                  size = opts.minTickSize;
              }
  
              axis.delta = delta;
              axis.tickDecimals = Math.max(0, maxDec != null ? maxDec : dec);
              axis.tickSize = opts.tickSize || size;
  
              // Time mode was moved to a plug-in in 0.8, and since so many people use it
              // we'll add an especially friendly reminder to make sure they included it.
  
              if (opts.mode == "time" && !axis.tickGenerator) {
                  throw new Error("Time mode requires the flot.time plugin.");
              }
  
              // Flot supports base-10 axes; any other mode else is handled by a plug-in,
              // like flot.time.js.
  
              if (!axis.tickGenerator) {
  
                  axis.tickGenerator = function (axis) {
  
                      var ticks = [],
                          start = floorInBase(axis.min, axis.tickSize),
                          i = 0,
                          v = Number.NaN,
                          prev;
  
                      do {
                          prev = v;
                          v = start + i * axis.tickSize;
                          ticks.push(v);
                          ++i;
                      } while (v < axis.max && v != prev);
                      return ticks;
                  };
  
  				axis.tickFormatter = function (value, axis) {
  
  					var factor = axis.tickDecimals ? Math.pow(10, axis.tickDecimals) : 1;
  					var formatted = "" + Math.round(value * factor) / factor;
  
  					// If tickDecimals was specified, ensure that we have exactly that
  					// much precision; otherwise default to the value's own precision.
  
  					if (axis.tickDecimals != null) {
  						var decimal = formatted.indexOf(".");
  						var precision = decimal == -1 ? 0 : formatted.length - decimal - 1;
  						if (precision < axis.tickDecimals) {
  							return (precision ? formatted : formatted + ".") + ("" + factor).substr(1, axis.tickDecimals - precision);
  						}
  					}
  
                      return formatted;
                  };
              }
  
              if ($.isFunction(opts.tickFormatter))
                  axis.tickFormatter = function (v, axis) { return "" + opts.tickFormatter(v, axis); };
  
              if (opts.alignTicksWithAxis != null) {
                  var otherAxis = (axis.direction == "x" ? xaxes : yaxes)[opts.alignTicksWithAxis - 1];
                  if (otherAxis && otherAxis.used && otherAxis != axis) {
                      // consider snapping min/max to outermost nice ticks
                      var niceTicks = axis.tickGenerator(axis);
                      if (niceTicks.length > 0) {
                          if (opts.min == null)
                              axis.min = Math.min(axis.min, niceTicks[0]);
                          if (opts.max == null && niceTicks.length > 1)
                              axis.max = Math.max(axis.max, niceTicks[niceTicks.length - 1]);
                      }
  
                      axis.tickGenerator = function (axis) {
                          // copy ticks, scaled to this axis
                          var ticks = [], v, i;
                          for (i = 0; i < otherAxis.ticks.length; ++i) {
                              v = (otherAxis.ticks[i].v - otherAxis.min) / (otherAxis.max - otherAxis.min);
                              v = axis.min + v * (axis.max - axis.min);
                              ticks.push(v);
                          }
                          return ticks;
                      };
  
                      // we might need an extra decimal since forced
                      // ticks don't necessarily fit naturally
                      if (!axis.mode && opts.tickDecimals == null) {
                          var extraDec = Math.max(0, -Math.floor(Math.log(axis.delta) / Math.LN10) + 1),
                              ts = axis.tickGenerator(axis);
  
                          // only proceed if the tick interval rounded
                          // with an extra decimal doesn't give us a
                          // zero at end
                          if (!(ts.length > 1 && /\..*0$/.test((ts[1] - ts[0]).toFixed(extraDec))))
                              axis.tickDecimals = extraDec;
                      }
                  }
              }
          }
  
          function setTicks(axis) {
              var oticks = axis.options.ticks, ticks = [];
              if (oticks == null || (typeof oticks == "number" && oticks > 0))
                  ticks = axis.tickGenerator(axis);
              else if (oticks) {
                  if ($.isFunction(oticks))
                      // generate the ticks
                      ticks = oticks(axis);
                  else
                      ticks = oticks;
              }
  
              // clean up/labelify the supplied ticks, copy them over
              var i, v;
              axis.ticks = [];
              for (i = 0; i < ticks.length; ++i) {
                  var label = null;
                  var t = ticks[i];
                  if (typeof t == "object") {
                      v = +t[0];
                      if (t.length > 1)
                          label = t[1];
                  }
                  else
                      v = +t;
                  if (label == null)
                      label = axis.tickFormatter(v, axis);
                  if (!isNaN(v))
                      axis.ticks.push({ v: v, label: label });
              }
          }
  
          function snapRangeToTicks(axis, ticks) {
              if (axis.options.autoscaleMargin && ticks.length > 0) {
                  // snap to ticks
                  if (axis.options.min == null)
                      axis.min = Math.min(axis.min, ticks[0].v);
                  if (axis.options.max == null && ticks.length > 1)
                      axis.max = Math.max(axis.max, ticks[ticks.length - 1].v);
              }
          }
  
          function draw() {
  
              surface.clear();
  
              executeHooks(hooks.drawBackground, [ctx]);
  
              var grid = options.grid;
  
              // draw background, if any
              if (grid.show && grid.backgroundColor)
                  drawBackground();
  
              if (grid.show && !grid.aboveData) {
                  drawGrid();
              }
  
              for (var i = 0; i < series.length; ++i) {
                  executeHooks(hooks.drawSeries, [ctx, series[i]]);
                  drawSeries(series[i]);
              }
  
              executeHooks(hooks.draw, [ctx]);
  
              if (grid.show && grid.aboveData) {
                  drawGrid();
              }
  
              surface.render();
  
              // A draw implies that either the axes or data have changed, so we
              // should probably update the overlay highlights as well.
  
              triggerRedrawOverlay();
          }
  
          function extractRange(ranges, coord) {
              var axis, from, to, key, axes = allAxes();
  
              for (var i = 0; i < axes.length; ++i) {
                  axis = axes[i];
                  if (axis.direction == coord) {
                      key = coord + axis.n + "axis";
                      if (!ranges[key] && axis.n == 1)
                          key = coord + "axis"; // support x1axis as xaxis
                      if (ranges[key]) {
                          from = ranges[key].from;
                          to = ranges[key].to;
                          break;
                      }
                  }
              }
  
              // backwards-compat stuff - to be removed in future
              if (!ranges[key]) {
                  axis = coord == "x" ? xaxes[0] : yaxes[0];
                  from = ranges[coord + "1"];
                  to = ranges[coord + "2"];
              }
  
              // auto-reverse as an added bonus
              if (from != null && to != null && from > to) {
                  var tmp = from;
                  from = to;
                  to = tmp;
              }
  
              return { from: from, to: to, axis: axis };
          }
  
          function drawBackground() {
              ctx.save();
              ctx.translate(plotOffset.left, plotOffset.top);
  
              ctx.fillStyle = getColorOrGradient(options.grid.backgroundColor, plotHeight, 0, "rgba(255, 255, 255, 0)");
              ctx.fillRect(0, 0, plotWidth, plotHeight);
              ctx.restore();
          }
  
          function drawGrid() {
              var i, axes, bw, bc;
  
              ctx.save();
              ctx.translate(plotOffset.left, plotOffset.top);
  
              // draw markings
              var markings = options.grid.markings;
              if (markings) {
                  if ($.isFunction(markings)) {
                      axes = plot.getAxes();
                      // xmin etc. is backwards compatibility, to be
                      // removed in the future
                      axes.xmin = axes.xaxis.min;
                      axes.xmax = axes.xaxis.max;
                      axes.ymin = axes.yaxis.min;
                      axes.ymax = axes.yaxis.max;
  
                      markings = markings(axes);
                  }
  
                  for (i = 0; i < markings.length; ++i) {
                      var m = markings[i],
                          xrange = extractRange(m, "x"),
                          yrange = extractRange(m, "y");
  
                      // fill in missing
                      if (xrange.from == null)
                          xrange.from = xrange.axis.min;
                      if (xrange.to == null)
                          xrange.to = xrange.axis.max;
                      if (yrange.from == null)
                          yrange.from = yrange.axis.min;
                      if (yrange.to == null)
                          yrange.to = yrange.axis.max;
  
                      // clip
                      if (xrange.to < xrange.axis.min || xrange.from > xrange.axis.max ||
                          yrange.to < yrange.axis.min || yrange.from > yrange.axis.max)
                          continue;
  
                      xrange.from = Math.max(xrange.from, xrange.axis.min);
                      xrange.to = Math.min(xrange.to, xrange.axis.max);
                      yrange.from = Math.max(yrange.from, yrange.axis.min);
                      yrange.to = Math.min(yrange.to, yrange.axis.max);
  
                      var xequal = xrange.from === xrange.to,
                          yequal = yrange.from === yrange.to;
  
                      if (xequal && yequal) {
                          continue;
                      }
  
                      // then draw
                      xrange.from = Math.floor(xrange.axis.p2c(xrange.from));
                      xrange.to = Math.floor(xrange.axis.p2c(xrange.to));
                      yrange.from = Math.floor(yrange.axis.p2c(yrange.from));
                      yrange.to = Math.floor(yrange.axis.p2c(yrange.to));
  
                      if (xequal || yequal) {
                          var lineWidth = m.lineWidth || options.grid.markingsLineWidth,
                              subPixel = lineWidth % 2 ? 0.5 : 0;
                          ctx.beginPath();
                          ctx.strokeStyle = m.color || options.grid.markingsColor;
                          ctx.lineWidth = lineWidth;
                          if (xequal) {
                              ctx.moveTo(xrange.to + subPixel, yrange.from);
                              ctx.lineTo(xrange.to + subPixel, yrange.to);
                          } else {
                              ctx.moveTo(xrange.from, yrange.to + subPixel);
                              ctx.lineTo(xrange.to, yrange.to + subPixel);                            
                          }
                          ctx.stroke();
                      } else {
                          ctx.fillStyle = m.color || options.grid.markingsColor;
                          ctx.fillRect(xrange.from, yrange.to,
                                       xrange.to - xrange.from,
                                       yrange.from - yrange.to);
                      }
                  }
              }
  
              // draw the ticks
              axes = allAxes();
              bw = options.grid.borderWidth;
  
              for (var j = 0; j < axes.length; ++j) {
                  var axis = axes[j], box = axis.box,
                      t = axis.tickLength, x, y, xoff, yoff;
                  if (!axis.show || axis.ticks.length == 0)
                      continue;
  
                  ctx.lineWidth = 1;
  
                  // find the edges
                  if (axis.direction == "x") {
                      x = 0;
                      if (t == "full")
                          y = (axis.position == "top" ? 0 : plotHeight);
                      else
                          y = box.top - plotOffset.top + (axis.position == "top" ? box.height : 0);
                  }
                  else {
                      y = 0;
                      if (t == "full")
                          x = (axis.position == "left" ? 0 : plotWidth);
                      else
                          x = box.left - plotOffset.left + (axis.position == "left" ? box.width : 0);
                  }
  
                  // draw tick bar
                  if (!axis.innermost) {
                      ctx.strokeStyle = axis.options.color;
                      ctx.beginPath();
                      xoff = yoff = 0;
                      if (axis.direction == "x")
                          xoff = plotWidth + 1;
                      else
                          yoff = plotHeight + 1;
  
                      if (ctx.lineWidth == 1) {
                          if (axis.direction == "x") {
                              y = Math.floor(y) + 0.5;
                          } else {
                              x = Math.floor(x) + 0.5;
                          }
                      }
  
                      ctx.moveTo(x, y);
                      ctx.lineTo(x + xoff, y + yoff);
                      ctx.stroke();
                  }
  
                  // draw ticks
  
                  ctx.strokeStyle = axis.options.tickColor;
  
                  ctx.beginPath();
                  for (i = 0; i < axis.ticks.length; ++i) {
                      var v = axis.ticks[i].v;
  
                      xoff = yoff = 0;
  
                      if (isNaN(v) || v < axis.min || v > axis.max
                          // skip those lying on the axes if we got a border
                          || (t == "full"
                              && ((typeof bw == "object" && bw[axis.position] > 0) || bw > 0)
                              && (v == axis.min || v == axis.max)))
                          continue;
  
                      if (axis.direction == "x") {
                          x = axis.p2c(v);
                          yoff = t == "full" ? -plotHeight : t;
  
                          if (axis.position == "top")
                              yoff = -yoff;
                      }
                      else {
                          y = axis.p2c(v);
                          xoff = t == "full" ? -plotWidth : t;
  
                          if (axis.position == "left")
                              xoff = -xoff;
                      }
  
                      if (ctx.lineWidth == 1) {
                          if (axis.direction == "x")
                              x = Math.floor(x) + 0.5;
                          else
                              y = Math.floor(y) + 0.5;
                      }
  
                      ctx.moveTo(x, y);
                      ctx.lineTo(x + xoff, y + yoff);
                  }
  
                  ctx.stroke();
              }
  
  
              // draw border
              if (bw) {
                  // If either borderWidth or borderColor is an object, then draw the border
                  // line by line instead of as one rectangle
                  bc = options.grid.borderColor;
                  if(typeof bw == "object" || typeof bc == "object") {
                      if (typeof bw !== "object") {
                          bw = {top: bw, right: bw, bottom: bw, left: bw};
                      }
                      if (typeof bc !== "object") {
                          bc = {top: bc, right: bc, bottom: bc, left: bc};
                      }
  
                      if (bw.top > 0) {
                          ctx.strokeStyle = bc.top;
                          ctx.lineWidth = bw.top;
                          ctx.beginPath();
                          ctx.moveTo(0 - bw.left, 0 - bw.top/2);
                          ctx.lineTo(plotWidth, 0 - bw.top/2);
                          ctx.stroke();
                      }
  
                      if (bw.right > 0) {
                          ctx.strokeStyle = bc.right;
                          ctx.lineWidth = bw.right;
                          ctx.beginPath();
                          ctx.moveTo(plotWidth + bw.right / 2, 0 - bw.top);
                          ctx.lineTo(plotWidth + bw.right / 2, plotHeight);
                          ctx.stroke();
                      }
  
                      if (bw.bottom > 0) {
                          ctx.strokeStyle = bc.bottom;
                          ctx.lineWidth = bw.bottom;
                          ctx.beginPath();
                          ctx.moveTo(plotWidth + bw.right, plotHeight + bw.bottom / 2);
                          ctx.lineTo(0, plotHeight + bw.bottom / 2);
                          ctx.stroke();
                      }
  
                      if (bw.left > 0) {
                          ctx.strokeStyle = bc.left;
                          ctx.lineWidth = bw.left;
                          ctx.beginPath();
                          ctx.moveTo(0 - bw.left/2, plotHeight + bw.bottom);
                          ctx.lineTo(0- bw.left/2, 0);
                          ctx.stroke();
                      }
                  }
                  else {
                      ctx.lineWidth = bw;
                      ctx.strokeStyle = options.grid.borderColor;
                      ctx.strokeRect(-bw/2, -bw/2, plotWidth + bw, plotHeight + bw);
                  }
              }
  
              ctx.restore();
          }
  
          function drawAxisLabels() {
  
              $.each(allAxes(), function (_, axis) {
                  var box = axis.box,
                      legacyStyles = axis.direction + "Axis " + axis.direction + axis.n + "Axis",
                      layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis " + legacyStyles,
                      font = axis.options.font || "flot-tick-label tickLabel",
                      tick, x, y, halign, valign;
  
                  // Remove text before checking for axis.show and ticks.length;
                  // otherwise plugins, like flot-tickrotor, that draw their own
                  // tick labels will end up with both theirs and the defaults.
  
                  surface.removeText(layer);
  
                  if (!axis.show || axis.ticks.length == 0)
                      return;
  
                  for (var i = 0; i < axis.ticks.length; ++i) {
  
                      tick = axis.ticks[i];
                      if (!tick.label || tick.v < axis.min || tick.v > axis.max)
                          continue;
  
                      if (axis.direction == "x") {
                          halign = "center";
                          x = plotOffset.left + axis.p2c(tick.v);
                          if (axis.position == "bottom") {
                              y = box.top + box.padding;
                          } else {
                              y = box.top + box.height - box.padding;
                              valign = "bottom";
                          }
                      } else {
                          valign = "middle";
                          y = plotOffset.top + axis.p2c(tick.v);
                          if (axis.position == "left") {
                              x = box.left + box.width - box.padding;
                              halign = "right";
                          } else {
                              x = box.left + box.padding;
                          }
                      }
  
                      surface.addText(layer, x, y, tick.label, font, null, null, halign, valign);
                  }
              });
          }
  
          function drawSeries(series) {
              if (series.lines.show)
                  drawSeriesLines(series);
              if (series.bars.show)
                  drawSeriesBars(series);
              if (series.points.show)
                  drawSeriesPoints(series);
          }
  
          function drawSeriesLines(series) {
              function plotLine(datapoints, xoffset, yoffset, axisx, axisy) {
                  var points = datapoints.points,
                      ps = datapoints.pointsize,
                      prevx = null, prevy = null;
  
                  ctx.beginPath();
                  for (var i = ps; i < points.length; i += ps) {
                      var x1 = points[i - ps], y1 = points[i - ps + 1],
                          x2 = points[i], y2 = points[i + 1];
  
                      if (x1 == null || x2 == null)
                          continue;
  
                      // clip with ymin
                      if (y1 <= y2 && y1 < axisy.min) {
                          if (y2 < axisy.min)
                              continue;   // line segment is outside
                          // compute new intersection point
                          x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
                          y1 = axisy.min;
                      }
                      else if (y2 <= y1 && y2 < axisy.min) {
                          if (y1 < axisy.min)
                              continue;
                          x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
                          y2 = axisy.min;
                      }
  
                      // clip with ymax
                      if (y1 >= y2 && y1 > axisy.max) {
                          if (y2 > axisy.max)
                              continue;
                          x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
                          y1 = axisy.max;
                      }
                      else if (y2 >= y1 && y2 > axisy.max) {
                          if (y1 > axisy.max)
                              continue;
                          x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
                          y2 = axisy.max;
                      }
  
                      // clip with xmin
                      if (x1 <= x2 && x1 < axisx.min) {
                          if (x2 < axisx.min)
                              continue;
                          y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
                          x1 = axisx.min;
                      }
                      else if (x2 <= x1 && x2 < axisx.min) {
                          if (x1 < axisx.min)
                              continue;
                          y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
                          x2 = axisx.min;
                      }
  
                      // clip with xmax
                      if (x1 >= x2 && x1 > axisx.max) {
                          if (x2 > axisx.max)
                              continue;
                          y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
                          x1 = axisx.max;
                      }
                      else if (x2 >= x1 && x2 > axisx.max) {
                          if (x1 > axisx.max)
                              continue;
                          y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
                          x2 = axisx.max;
                      }
  
                      if (x1 != prevx || y1 != prevy)
                          ctx.moveTo(axisx.p2c(x1) + xoffset, axisy.p2c(y1) + yoffset);
  
                      prevx = x2;
                      prevy = y2;
                      ctx.lineTo(axisx.p2c(x2) + xoffset, axisy.p2c(y2) + yoffset);
                  }
                  ctx.stroke();
              }
  
              function plotLineArea(datapoints, axisx, axisy) {
                  var points = datapoints.points,
                      ps = datapoints.pointsize,
                      bottom = Math.min(Math.max(0, axisy.min), axisy.max),
                      i = 0, top, areaOpen = false,
                      ypos = 1, segmentStart = 0, segmentEnd = 0;
  
                  // we process each segment in two turns, first forward
                  // direction to sketch out top, then once we hit the
                  // end we go backwards to sketch the bottom
                  while (true) {
                      if (ps > 0 && i > points.length + ps)
                          break;
  
                      i += ps; // ps is negative if going backwards
  
                      var x1 = points[i - ps],
                          y1 = points[i - ps + ypos],
                          x2 = points[i], y2 = points[i + ypos];
  
                      if (areaOpen) {
                          if (ps > 0 && x1 != null && x2 == null) {
                              // at turning point
                              segmentEnd = i;
                              ps = -ps;
                              ypos = 2;
                              continue;
                          }
  
                          if (ps < 0 && i == segmentStart + ps) {
                              // done with the reverse sweep
                              ctx.fill();
                              areaOpen = false;
                              ps = -ps;
                              ypos = 1;
                              i = segmentStart = segmentEnd + ps;
                              continue;
                          }
                      }
  
                      if (x1 == null || x2 == null)
                          continue;
  
                      // clip x values
  
                      // clip with xmin
                      if (x1 <= x2 && x1 < axisx.min) {
                          if (x2 < axisx.min)
                              continue;
                          y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
                          x1 = axisx.min;
                      }
                      else if (x2 <= x1 && x2 < axisx.min) {
                          if (x1 < axisx.min)
                              continue;
                          y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
                          x2 = axisx.min;
                      }
  
                      // clip with xmax
                      if (x1 >= x2 && x1 > axisx.max) {
                          if (x2 > axisx.max)
                              continue;
                          y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
                          x1 = axisx.max;
                      }
                      else if (x2 >= x1 && x2 > axisx.max) {
                          if (x1 > axisx.max)
                              continue;
                          y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
                          x2 = axisx.max;
                      }
  
                      if (!areaOpen) {
                          // open area
                          ctx.beginPath();
                          ctx.moveTo(axisx.p2c(x1), axisy.p2c(bottom));
                          areaOpen = true;
                      }
  
                      // now first check the case where both is outside
                      if (y1 >= axisy.max && y2 >= axisy.max) {
                          ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.max));
                          ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.max));
                          continue;
                      }
                      else if (y1 <= axisy.min && y2 <= axisy.min) {
                          ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.min));
                          ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.min));
                          continue;
                      }
  
                      // else it's a bit more complicated, there might
                      // be a flat maxed out rectangle first, then a
                      // triangular cutout or reverse; to find these
                      // keep track of the current x values
                      var x1old = x1, x2old = x2;
  
                      // clip the y values, without shortcutting, we
                      // go through all cases in turn
  
                      // clip with ymin
                      if (y1 <= y2 && y1 < axisy.min && y2 >= axisy.min) {
                          x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
                          y1 = axisy.min;
                      }
                      else if (y2 <= y1 && y2 < axisy.min && y1 >= axisy.min) {
                          x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
                          y2 = axisy.min;
                      }
  
                      // clip with ymax
                      if (y1 >= y2 && y1 > axisy.max && y2 <= axisy.max) {
                          x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
                          y1 = axisy.max;
                      }
                      else if (y2 >= y1 && y2 > axisy.max && y1 <= axisy.max) {
                          x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
                          y2 = axisy.max;
                      }
  
                      // if the x value was changed we got a rectangle
                      // to fill
                      if (x1 != x1old) {
                          ctx.lineTo(axisx.p2c(x1old), axisy.p2c(y1));
                          // it goes to (x1, y1), but we fill that below
                      }
  
                      // fill triangular section, this sometimes result
                      // in redundant points if (x1, y1) hasn't changed
                      // from previous line to, but we just ignore that
                      ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
                      ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
  
                      // fill the other rectangle if it's there
                      if (x2 != x2old) {
                          ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
                          ctx.lineTo(axisx.p2c(x2old), axisy.p2c(y2));
                      }
                  }
              }
  
              ctx.save();
              ctx.translate(plotOffset.left, plotOffset.top);
              ctx.lineJoin = "round";
  
              var lw = series.lines.lineWidth,
                  sw = series.shadowSize;
              // FIXME: consider another form of shadow when filling is turned on
              if (lw > 0 && sw > 0) {
                  // draw shadow as a thick and thin line with transparency
                  ctx.lineWidth = sw;
                  ctx.strokeStyle = "rgba(0,0,0,0.1)";
                  // position shadow at angle from the mid of line
                  var angle = Math.PI/18;
                  plotLine(series.datapoints, Math.sin(angle) * (lw/2 + sw/2), Math.cos(angle) * (lw/2 + sw/2), series.xaxis, series.yaxis);
                  ctx.lineWidth = sw/2;
                  plotLine(series.datapoints, Math.sin(angle) * (lw/2 + sw/4), Math.cos(angle) * (lw/2 + sw/4), series.xaxis, series.yaxis);
              }
  
              ctx.lineWidth = lw;
              ctx.strokeStyle = series.color;
              var fillStyle = getFillStyle(series.lines, series.color, 0, plotHeight);
              if (fillStyle) {
                  ctx.fillStyle = fillStyle;
                  plotLineArea(series.datapoints, series.xaxis, series.yaxis);
              }
  
              if (lw > 0)
                  plotLine(series.datapoints, 0, 0, series.xaxis, series.yaxis);
              ctx.restore();
          }
  
          function drawSeriesPoints(series) {
              function plotPoints(datapoints, radius, fillStyle, offset, shadow, axisx, axisy, symbol) {
                  var points = datapoints.points, ps = datapoints.pointsize;
  
                  for (var i = 0; i < points.length; i += ps) {
                      var x = points[i], y = points[i + 1];
                      if (x == null || x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
                          continue;
  
                      ctx.beginPath();
                      x = axisx.p2c(x);
                      y = axisy.p2c(y) + offset;
                      if (symbol == "circle")
                          ctx.arc(x, y, radius, 0, shadow ? Math.PI : Math.PI * 2, false);
                      else
                          symbol(ctx, x, y, radius, shadow);
                      ctx.closePath();
  
                      if (fillStyle) {
                          ctx.fillStyle = fillStyle;
                          ctx.fill();
                      }
                      ctx.stroke();
                  }
              }
  
              ctx.save();
              ctx.translate(plotOffset.left, plotOffset.top);
  
              var lw = series.points.lineWidth,
                  sw = series.shadowSize,
                  radius = series.points.radius,
                  symbol = series.points.symbol;
  
              // If the user sets the line width to 0, we change it to a very 
              // small value. A line width of 0 seems to force the default of 1.
              // Doing the conditional here allows the shadow setting to still be 
              // optional even with a lineWidth of 0.
  
              if( lw == 0 )
                  lw = 0.0001;
  
              if (lw > 0 && sw > 0) {
                  // draw shadow in two steps
                  var w = sw / 2;
                  ctx.lineWidth = w;
                  ctx.strokeStyle = "rgba(0,0,0,0.1)";
                  plotPoints(series.datapoints, radius, null, w + w/2, true,
                             series.xaxis, series.yaxis, symbol);
  
                  ctx.strokeStyle = "rgba(0,0,0,0.2)";
                  plotPoints(series.datapoints, radius, null, w/2, true,
                             series.xaxis, series.yaxis, symbol);
              }
  
              ctx.lineWidth = lw;
              ctx.strokeStyle = series.color;
              plotPoints(series.datapoints, radius,
                         getFillStyle(series.points, series.color), 0, false,
                         series.xaxis, series.yaxis, symbol);
              ctx.restore();
          }
  
          function drawBar(x, y, b, barLeft, barRight, fillStyleCallback, axisx, axisy, c, horizontal, lineWidth) {
              var left, right, bottom, top,
                  drawLeft, drawRight, drawTop, drawBottom,
                  tmp;
  
              // in horizontal mode, we start the bar from the left
              // instead of from the bottom so it appears to be
              // horizontal rather than vertical
              if (horizontal) {
                  drawBottom = drawRight = drawTop = true;
                  drawLeft = false;
                  left = b;
                  right = x;
                  top = y + barLeft;
                  bottom = y + barRight;
  
                  // account for negative bars
                  if (right < left) {
                      tmp = right;
                      right = left;
                      left = tmp;
                      drawLeft = true;
                      drawRight = false;
                  }
              }
              else {
                  drawLeft = drawRight = drawTop = true;
                  drawBottom = false;
                  left = x + barLeft;
                  right = x + barRight;
                  bottom = b;
                  top = y;
  
                  // account for negative bars
                  if (top < bottom) {
                      tmp = top;
                      top = bottom;
                      bottom = tmp;
                      drawBottom = true;
                      drawTop = false;
                  }
              }
  
              // clip
              if (right < axisx.min || left > axisx.max ||
                  top < axisy.min || bottom > axisy.max)
                  return;
  
              if (left < axisx.min) {
                  left = axisx.min;
                  drawLeft = false;
              }
  
              if (right > axisx.max) {
                  right = axisx.max;
                  drawRight = false;
              }
  
              if (bottom < axisy.min) {
                  bottom = axisy.min;
                  drawBottom = false;
              }
  
              if (top > axisy.max) {
                  top = axisy.max;
                  drawTop = false;
              }
  
              left = axisx.p2c(left);
              bottom = axisy.p2c(bottom);
              right = axisx.p2c(right);
              top = axisy.p2c(top);
  
              // fill the bar
              if (fillStyleCallback) {
                  c.fillStyle = fillStyleCallback(bottom, top);
                  c.fillRect(left, top, right - left, bottom - top)
              }
  
              // draw outline
              if (lineWidth > 0 && (drawLeft || drawRight || drawTop || drawBottom)) {
                  c.beginPath();
  
                  // FIXME: inline moveTo is buggy with excanvas
                  c.moveTo(left, bottom);
                  if (drawLeft)
                      c.lineTo(left, top);
                  else
                      c.moveTo(left, top);
                  if (drawTop)
                      c.lineTo(right, top);
                  else
                      c.moveTo(right, top);
                  if (drawRight)
                      c.lineTo(right, bottom);
                  else
                      c.moveTo(right, bottom);
                  if (drawBottom)
                      c.lineTo(left, bottom);
                  else
                      c.moveTo(left, bottom);
                  c.stroke();
              }
          }
  
          function drawSeriesBars(series) {
              function plotBars(datapoints, barLeft, barRight, fillStyleCallback, axisx, axisy) {
                  var points = datapoints.points, ps = datapoints.pointsize;
  
                  for (var i = 0; i < points.length; i += ps) {
                      if (points[i] == null)
                          continue;
                      drawBar(points[i], points[i + 1], points[i + 2], barLeft, barRight, fillStyleCallback, axisx, axisy, ctx, series.bars.horizontal, series.bars.lineWidth);
                  }
              }
  
              ctx.save();
              ctx.translate(plotOffset.left, plotOffset.top);
  
              // FIXME: figure out a way to add shadows (for instance along the right edge)
              ctx.lineWidth = series.bars.lineWidth;
              ctx.strokeStyle = series.color;
  
              var barLeft;
  
              switch (series.bars.align) {
                  case "left":
                      barLeft = 0;
                      break;
                  case "right":
                      barLeft = -series.bars.barWidth;
                      break;
                  default:
                      barLeft = -series.bars.barWidth / 2;
              }
  
              var fillStyleCallback = series.bars.fill ? function (bottom, top) { return getFillStyle(series.bars, series.color, bottom, top); } : null;
              plotBars(series.datapoints, barLeft, barLeft + series.bars.barWidth, fillStyleCallback, series.xaxis, series.yaxis);
              ctx.restore();
          }
  
          function getFillStyle(filloptions, seriesColor, bottom, top) {
              var fill = filloptions.fill;
              if (!fill)
                  return null;
  
              if (filloptions.fillColor)
                  return getColorOrGradient(filloptions.fillColor, bottom, top, seriesColor);
  
              var c = $.color.parse(seriesColor);
              c.a = typeof fill == "number" ? fill : 0.4;
              c.normalize();
              return c.toString();
          }
  
          function insertLegend() {
  
              if (options.legend.container != null) {
                  $(options.legend.container).html("");
              } else {
                  placeholder.find(".legend").remove();
              }
  
              if (!options.legend.show) {
                  return;
              }
  
              var fragments = [], entries = [], rowStarted = false,
                  lf = options.legend.labelFormatter, s, label;
  
              // Build a list of legend entries, with each having a label and a color
  
              for (var i = 0; i < series.length; ++i) {
                  s = series[i];
                  if (s.label) {
                      label = lf ? lf(s.label, s) : s.label;
                      if (label) {
                          entries.push({
                              label: label,
                              color: s.color
                          });
                      }
                  }
              }
  
              // Sort the legend using either the default or a custom comparator
  
              if (options.legend.sorted) {
                  if ($.isFunction(options.legend.sorted)) {
                      entries.sort(options.legend.sorted);
                  } else if (options.legend.sorted == "reverse") {
                  	entries.reverse();
                  } else {
                      var ascending = options.legend.sorted != "descending";
                      entries.sort(function(a, b) {
                          return a.label == b.label ? 0 : (
                              (a.label < b.label) != ascending ? 1 : -1   // Logical XOR
                          );
                      });
                  }
              }
  
              // Generate markup for the list of entries, in their final order
  
              for (var i = 0; i < entries.length; ++i) {
  
                  var entry = entries[i];
  
                  if (i % options.legend.noColumns == 0) {
                      if (rowStarted)
                          fragments.push('</tr>');
                      fragments.push('<tr>');
                      rowStarted = true;
                  }
  
                  fragments.push(
                      '<td class="legendColorBox"><div style="border:1px solid ' + options.legend.labelBoxBorderColor + ';padding:1px"><div style="width:4px;height:0;border:5px solid ' + entry.color + ';overflow:hidden"></div></div></td>' +
                      '<td class="legendLabel">' + entry.label + '</td>'
                  );
              }
  
              if (rowStarted)
                  fragments.push('</tr>');
  
              if (fragments.length == 0)
                  return;
  
              var table = '<table style="font-size:smaller;color:' + options.grid.color + '">' + fragments.join("") + '</table>';
              if (options.legend.container != null)
                  $(options.legend.container).html(table);
              else {
                  var pos = "",
                      p = options.legend.position,
                      m = options.legend.margin;
                  if (m[0] == null)
                      m = [m, m];
                  if (p.charAt(0) == "n")
                      pos += 'top:' + (m[1] + plotOffset.top) + 'px;';
                  else if (p.charAt(0) == "s")
                      pos += 'bottom:' + (m[1] + plotOffset.bottom) + 'px;';
                  if (p.charAt(1) == "e")
                      pos += 'right:' + (m[0] + plotOffset.right) + 'px;';
                  else if (p.charAt(1) == "w")
                      pos += 'left:' + (m[0] + plotOffset.left) + 'px;';
                  var legend = $('<div class="legend">' + table.replace('style="', 'style="position:absolute;' + pos +';') + '</div>').appendTo(placeholder);
                  if (options.legend.backgroundOpacity != 0.0) {
                      // put in the transparent background
                      // separately to avoid blended labels and
                      // label boxes
                      var c = options.legend.backgroundColor;
                      if (c == null) {
                          c = options.grid.backgroundColor;
                          if (c && typeof c == "string")
                              c = $.color.parse(c);
                          else
                              c = $.color.extract(legend, 'background-color');
                          c.a = 1;
                          c = c.toString();
                      }
                      var div = legend.children();
                      $('<div style="position:absolute;width:' + div.width() + 'px;height:' + div.height() + 'px;' + pos +'background-color:' + c + ';"> </div>').prependTo(legend).css('opacity', options.legend.backgroundOpacity);
                  }
              }
          }
  
  
          // interactive features
  
          var highlights = [],
              redrawTimeout = null;
  
          // returns the data item the mouse is over, or null if none is found
          function findNearbyItem(mouseX, mouseY, seriesFilter) {
              var maxDistance = options.grid.mouseActiveRadius,
                  smallestDistance = maxDistance * maxDistance + 1,
                  item = null, foundPoint = false, i, j, ps;
  
              for (i = series.length - 1; i >= 0; --i) {
                  if (!seriesFilter(series[i]))
                      continue;
  
                  var s = series[i],
                      axisx = s.xaxis,
                      axisy = s.yaxis,
                      points = s.datapoints.points,
                      mx = axisx.c2p(mouseX), // precompute some stuff to make the loop faster
                      my = axisy.c2p(mouseY),
                      maxx = maxDistance / axisx.scale,
                      maxy = maxDistance / axisy.scale;
  
                  ps = s.datapoints.pointsize;
                  // with inverse transforms, we can't use the maxx/maxy
                  // optimization, sadly
                  if (axisx.options.inverseTransform)
                      maxx = Number.MAX_VALUE;
                  if (axisy.options.inverseTransform)
                      maxy = Number.MAX_VALUE;
  
                  if (s.lines.show || s.points.show) {
                      for (j = 0; j < points.length; j += ps) {
                          var x = points[j], y = points[j + 1];
                          if (x == null)
                              continue;
  
                          // For points and lines, the cursor must be within a
                          // certain distance to the data point
                          if (x - mx > maxx || x - mx < -maxx ||
                              y - my > maxy || y - my < -maxy)
                              continue;
  
                          // We have to calculate distances in pixels, not in
                          // data units, because the scales of the axes may be different
                          var dx = Math.abs(axisx.p2c(x) - mouseX),
                              dy = Math.abs(axisy.p2c(y) - mouseY),
                              dist = dx * dx + dy * dy; // we save the sqrt
  
                          // use <= to ensure last point takes precedence
                          // (last generally means on top of)
                          if (dist < smallestDistance) {
                              smallestDistance = dist;
                              item = [i, j / ps];
                          }
                      }
                  }
  
                  if (s.bars.show && !item) { // no other point can be nearby
  
                      var barLeft, barRight;
  
                      switch (s.bars.align) {
                          case "left":
                              barLeft = 0;
                              break;
                          case "right":
                              barLeft = -s.bars.barWidth;
                              break;
                          default:
                              barLeft = -s.bars.barWidth / 2;
                      }
  
                      barRight = barLeft + s.bars.barWidth;
  
                      for (j = 0; j < points.length; j += ps) {
                          var x = points[j], y = points[j + 1], b = points[j + 2];
                          if (x == null)
                              continue;
  
                          // for a bar graph, the cursor must be inside the bar
                          if (series[i].bars.horizontal ?
                              (mx <= Math.max(b, x) && mx >= Math.min(b, x) &&
                               my >= y + barLeft && my <= y + barRight) :
                              (mx >= x + barLeft && mx <= x + barRight &&
                               my >= Math.min(b, y) && my <= Math.max(b, y)))
                                  item = [i, j / ps];
                      }
                  }
              }
  
              if (item) {
                  i = item[0];
                  j = item[1];
                  ps = series[i].datapoints.pointsize;
  
                  return { datapoint: series[i].datapoints.points.slice(j * ps, (j + 1) * ps),
                           dataIndex: j,
                           series: series[i],
                           seriesIndex: i };
              }
  
              return null;
          }
  
          function onMouseMove(e) {
              if (options.grid.hoverable)
                  triggerClickHoverEvent("plothover", e,
                                         function (s) { return s["hoverable"] != false; });
          }
  
          function onMouseLeave(e) {
              if (options.grid.hoverable)
                  triggerClickHoverEvent("plothover", e,
                                         function (s) { return false; });
          }
  
          function onClick(e) {
              triggerClickHoverEvent("plotclick", e,
                                     function (s) { return s["clickable"] != false; });
          }
  
          // trigger click or hover event (they send the same parameters
          // so we share their code)
          function triggerClickHoverEvent(eventname, event, seriesFilter) {
              var offset = eventHolder.offset(),
                  canvasX = event.pageX - offset.left - plotOffset.left,
                  canvasY = event.pageY - offset.top - plotOffset.top,
              pos = canvasToAxisCoords({ left: canvasX, top: canvasY });
  
              pos.pageX = event.pageX;
              pos.pageY = event.pageY;
  
              var item = findNearbyItem(canvasX, canvasY, seriesFilter);
  
              if (item) {
                  // fill in mouse pos for any listeners out there
                  item.pageX = parseInt(item.series.xaxis.p2c(item.datapoint[0]) + offset.left + plotOffset.left, 10);
                  item.pageY = parseInt(item.series.yaxis.p2c(item.datapoint[1]) + offset.top + plotOffset.top, 10);
              }
  
              if (options.grid.autoHighlight) {
                  // clear auto-highlights
                  for (var i = 0; i < highlights.length; ++i) {
                      var h = highlights[i];
                      if (h.auto == eventname &&
                          !(item && h.series == item.series &&
                            h.point[0] == item.datapoint[0] &&
                            h.point[1] == item.datapoint[1]))
                          unhighlight(h.series, h.point);
                  }
  
                  if (item)
                      highlight(item.series, item.datapoint, eventname);
              }
  
              placeholder.trigger(eventname, [ pos, item ]);
          }
  
          function triggerRedrawOverlay() {
              var t = options.interaction.redrawOverlayInterval;
              if (t == -1) {      // skip event queue
                  drawOverlay();
                  return;
              }
  
              if (!redrawTimeout)
                  redrawTimeout = setTimeout(drawOverlay, t);
          }
  
          function drawOverlay() {
              redrawTimeout = null;
  
              // draw highlights
              octx.save();
              overlay.clear();
              octx.translate(plotOffset.left, plotOffset.top);
  
              var i, hi;
              for (i = 0; i < highlights.length; ++i) {
                  hi = highlights[i];
  
                  if (hi.series.bars.show)
                      drawBarHighlight(hi.series, hi.point);
                  else
                      drawPointHighlight(hi.series, hi.point);
              }
              octx.restore();
  
              executeHooks(hooks.drawOverlay, [octx]);
          }
  
          function highlight(s, point, auto) {
              if (typeof s == "number")
                  s = series[s];
  
              if (typeof point == "number") {
                  var ps = s.datapoints.pointsize;
                  point = s.datapoints.points.slice(ps * point, ps * (point + 1));
              }
  
              var i = indexOfHighlight(s, point);
              if (i == -1) {
                  highlights.push({ series: s, point: point, auto: auto });
  
                  triggerRedrawOverlay();
              }
              else if (!auto)
                  highlights[i].auto = false;
          }
  
          function unhighlight(s, point) {
              if (s == null && point == null) {
                  highlights = [];
                  triggerRedrawOverlay();
                  return;
              }
  
              if (typeof s == "number")
                  s = series[s];
  
              if (typeof point == "number") {
                  var ps = s.datapoints.pointsize;
                  point = s.datapoints.points.slice(ps * point, ps * (point + 1));
              }
  
              var i = indexOfHighlight(s, point);
              if (i != -1) {
                  highlights.splice(i, 1);
  
                  triggerRedrawOverlay();
              }
          }
  
          function indexOfHighlight(s, p) {
              for (var i = 0; i < highlights.length; ++i) {
                  var h = highlights[i];
                  if (h.series == s && h.point[0] == p[0]
                      && h.point[1] == p[1])
                      return i;
              }
              return -1;
          }
  
          function drawPointHighlight(series, point) {
              var x = point[0], y = point[1],
                  axisx = series.xaxis, axisy = series.yaxis,
                  highlightColor = (typeof series.highlightColor === "string") ? series.highlightColor : $.color.parse(series.color).scale('a', 0.5).toString();
  
              if (x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
                  return;
  
              var pointRadius = series.points.radius + series.points.lineWidth / 2;
              octx.lineWidth = pointRadius;
              octx.strokeStyle = highlightColor;
              var radius = 1.5 * pointRadius;
              x = axisx.p2c(x);
              y = axisy.p2c(y);
  
              octx.beginPath();
              if (series.points.symbol == "circle")
                  octx.arc(x, y, radius, 0, 2 * Math.PI, false);
              else
                  series.points.symbol(octx, x, y, radius, false);
              octx.closePath();
              octx.stroke();
          }
  
          function drawBarHighlight(series, point) {
              var highlightColor = (typeof series.highlightColor === "string") ? series.highlightColor : $.color.parse(series.color).scale('a', 0.5).toString(),
                  fillStyle = highlightColor,
                  barLeft;
  
              switch (series.bars.align) {
                  case "left":
                      barLeft = 0;
                      break;
                  case "right":
                      barLeft = -series.bars.barWidth;
                      break;
                  default:
                      barLeft = -series.bars.barWidth / 2;
              }
  
              octx.lineWidth = series.bars.lineWidth;
              octx.strokeStyle = highlightColor;
  
              drawBar(point[0], point[1], point[2] || 0, barLeft, barLeft + series.bars.barWidth,
                      function () { return fillStyle; }, series.xaxis, series.yaxis, octx, series.bars.horizontal, series.bars.lineWidth);
          }
  
          function getColorOrGradient(spec, bottom, top, defaultColor) {
              if (typeof spec == "string")
                  return spec;
              else {
                  // assume this is a gradient spec; IE currently only
                  // supports a simple vertical gradient properly, so that's
                  // what we support too
                  var gradient = ctx.createLinearGradient(0, top, 0, bottom);
  
                  for (var i = 0, l = spec.colors.length; i < l; ++i) {
                      var c = spec.colors[i];
                      if (typeof c != "string") {
                          var co = $.color.parse(defaultColor);
                          if (c.brightness != null)
                              co = co.scale('rgb', c.brightness);
                          if (c.opacity != null)
                              co.a *= c.opacity;
                          c = co.toString();
                      }
                      gradient.addColorStop(i / (l - 1), c);
                  }
  
                  return gradient;
              }
          }
      }
  
      // Add the plot function to the top level of the jQuery object
  
      $.plot = function(placeholder, data, options) {
          //var t0 = new Date();
          var plot = new Plot($(placeholder), data, options, $.plot.plugins);
          //(window.console ? console.log : alert)("time used (msecs): " + ((new Date()).getTime() - t0.getTime()));
          return plot;
      };
  
      $.plot.version = "0.8.3";
  
      $.plot.plugins = [];
  
      // Also add the plot function as a chainable property
  
      $.fn.plot = function(data, options) {
          return this.each(function() {
              $.plot(this, data, options);
          });
      };
  
      // round to nearby lower multiple of base
      function floorInBase(n, base) {
          return base * Math.floor(n / base);
      }
  
  })(jQuery);
  