text: /* Javascript plotting library for jQuery, v. 0.6.
   *
   * Released under the MIT license by IOLA, December 2007.
   *
   */
  
  // first an inline dependency, jquery.colorhelpers.js, we inline it here
  // for convenience
  
  /* Plugin for jQuery for working with colors.
   * 
   * Version 1.0.
   * 
   * 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() work in-place instead of returning
   * new objects.
   */ 
  (function(){jQuery.color={};jQuery.color.make=function(E,D,B,C){var F={};F.r=E||0;F.g=D||0;F.b=B||0;F.a=C!=null?C:1;F.add=function(I,H){for(var G=0;G<I.length;++G){F[I.charAt(G)]+=H}return F.normalize()};F.scale=function(I,H){for(var G=0;G<I.length;++G){F[I.charAt(G)]*=H}return F.normalize()};F.toString=function(){if(F.a>=1){return"rgb("+[F.r,F.g,F.b].join(",")+")"}else{return"rgba("+[F.r,F.g,F.b,F.a].join(",")+")"}};F.normalize=function(){function G(I,J,H){return J<I?I:(J>H?H:J)}F.r=G(0,parseInt(F.r),255);F.g=G(0,parseInt(F.g),255);F.b=G(0,parseInt(F.b),255);F.a=G(0,F.a,1);return F};F.clone=function(){return jQuery.color.make(F.r,F.b,F.g,F.a)};return F.normalize()};jQuery.color.extract=function(C,B){var D;do{D=C.css(B).toLowerCase();if(D!=""&&D!="transparent"){break}C=C.parent()}while(!jQuery.nodeName(C.get(0),"body"));if(D=="rgba(0, 0, 0, 0)"){D="transparent"}return jQuery.color.parse(D)};jQuery.color.parse=function(E){var D,B=jQuery.color.make;if(D=/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(E)){return B(parseInt(D[1],10),parseInt(D[2],10),parseInt(D[3],10))}if(D=/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(E)){return B(parseInt(D[1],10),parseInt(D[2],10),parseInt(D[3],10),parseFloat(D[4]))}if(D=/rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(E)){return B(parseFloat(D[1])*2.55,parseFloat(D[2])*2.55,parseFloat(D[3])*2.55)}if(D=/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(E)){return B(parseFloat(D[1])*2.55,parseFloat(D[2])*2.55,parseFloat(D[3])*2.55,parseFloat(D[4]))}if(D=/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(E)){return B(parseInt(D[1],16),parseInt(D[2],16),parseInt(D[3],16))}if(D=/#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(E)){return B(parseInt(D[1]+D[1],16),parseInt(D[2]+D[2],16),parseInt(D[3]+D[3],16))}var C=jQuery.trim(E).toLowerCase();if(C=="transparent"){return B(255,255,255,0)}else{D=A[C];return B(D[0],D[1],D[2])}};var A={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]}})();
  
  // the actual Flot code
  (function($) {
      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
                  },
                  xaxis: {
                      position: "bottom", // or "top"
                      mode: null, // null or "time"
                      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,
                      tickLength: null, // size in pixels of ticks, or "full" for whole line
                      alignTicksWithAxis: null, // axis number or null for no sync
                      
                      // mode specific options
                      tickDecimals: null, // no. of decimals, null means auto
                      tickSize: null, // number or [number, "unit"]
                      minTickSize: null, // number or [number, "unit"]
                      monthNames: null, // list of names of months
                      timeformat: null, // format string to use
                      twelveHourClock: false // 12 or 24 time in time mode
                  },
                  yaxis: {
                      autoscaleMargin: 0.02,
                      position: "left" // or "right"
                  },
                  xaxes: [],
                  yaxes: [],
                  series: {
                      points: {
                          show: false,
                          radius: 3,
                          lineWidth: 2, // in pixels
                          fill: true,
                          fillColor: "#ffffff"
                      },
                      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
                      },
                      bars: {
                          show: false,
                          lineWidth: 2, // in pixels
                          barWidth: 1, // in units of the x axis
                          fill: true,
                          fillColor: null,
                          align: "left", // or "center" 
                          horizontal: false
                      },
                      shadowSize: 3
                  },
                  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)"
                      labelMargin: 5, // in pixels
                      axisMargin: 8, // in pixels
                      borderWidth: 2, // in pixels
                      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
                  },
                  hooks: {}
              },
          canvas = 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},
          canvasWidth = 0, canvasHeight = 0,
          plotWidth = 0, plotHeight = 0,
          hooks = {
              processOptions: [],
              processRawData: [],
              processDatapoints: [],
              drawSeries: [],
              draw: [],
              bindEvents: [],
              drawOverlay: []
          },
          plot = this;
  
          // public functions
          plot.setData = setData;
          plot.setupGrid = setupGrid;
          plot.draw = draw;
          plot.getPlaceholder = function() { return placeholder; };
          plot.getCanvas = function() { return canvas; };
          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.getAxis = function (dir, number) {
              var a = (dir == x ? xaxes : yaxes)[number - 1];
              if (a && !a.used)
                  a = null;
              return a;
          };
          plot.getAxes = function () {
              var res = {}, i;
              for (i = 0; i < xaxes.length; ++i)
                  res["x" + (i ? (i + 1) : "") + "axis"] = xaxes[i] || {};
              for (i = 0; i < yaxes.length; ++i)
                  res["y" + (i ? (i + 1) : "") + "axis"] = yaxes[i] || {};
  
              // backwards compatibility - to be removed
              if (!res.x2axis)
                  res.x2axis = { n: 2 };
              if (!res.y2axis)
                  res.y2axis = { n: 2 };
              
              return res;
          };
          plot.getXAxes = function () { return xaxes; };
          plot.getYAxes = function () { return yaxes; };
          plot.getUsedAxes = getUsedAxes; // return flat array with x and y axes that are in use
          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),
                  top: parseInt(yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top)
              };
          };
  
          // public attributes
          plot.hooks = hooks;
          
          // initialize
          initPlugins(plot);
          parseOptions(options_);
          constructCanvas();
          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() {
              for (var i = 0; i < plugins.length; ++i) {
                  var p = plugins[i];
                  p.init(plot);
                  if (p.options)
                      $.extend(true, options, p.options);
              }
          }
          
          function parseOptions(opts) {
              var i;
              
              $.extend(true, options, opts);
              
              if (options.xaxis.color == null)
                  options.xaxis.color = options.grid.color;
              if (options.yaxis.color == null)
                  options.yaxis.color = options.grid.color;
              
              if (options.xaxis.tickColor == null) // backwards-compatibility
                  options.xaxis.tickColor = options.grid.tickColor;
              if (options.yaxis.tickColor == null) // backwards-compatibility
                  options.yaxis.tickColor = options.grid.tickColor;
  
              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 in axes, copy at least always the
              // first as the rest of the code assumes it'll be there
              for (i = 0; i < Math.max(1, options.xaxes.length); ++i)
                  options.xaxes[i] = $.extend(true, {}, options.xaxis, options.xaxes[i]);
              for (i = 0; i < Math.max(1, options.yaxes.length); ++i)
                  options.yaxes[i] = $.extend(true, {}, options.yaxis, options.yaxes[i]);
              // 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.y2axis.position = "top";
                  options.xaxes[1] = options.x2axis;
              }
              if (options.y2axis) {
                  if (options.y2axis.autoscaleMargin === undefined)
                      options.y2axis.autoscaleMargin = 0.02;
                  options.y2axis.position = "right";
                  options.yaxes[1] = options.y2axis;
              }
              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)
                  options.series.shadowSize = options.shadowSize;
  
              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) {
                      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 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]) {
                          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]) {
                          res.top = axis.p2c(pos[key]);
                          break;
                      }
                  }
              }
              
              return res;
          }
          
          function getUsedAxes() {
              var res = [], i, axis;
              for (i = 0; i < xaxes.length; ++i) {
                  axis = xaxes[i];
                  if (axis && axis.used)
                      res.push(axis);
              }
              for (i = 0; i < yaxes.length; ++i) {
                  axis = yaxes[i];
                  if (axis && axis.used)
                      res.push(axis);
              }
              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 i;
              
              // collect what we already got of colors
              var neededColors = series.length,
                  usedColors = [],
                  assignedColors = [];
              for (i = 0; i < series.length; ++i) {
                  var sc = series[i].color;
                  if (sc != null) {
                      --neededColors;
                      if (typeof sc == "number")
                          assignedColors.push(sc);
                      else
                          usedColors.push($.color.parse(series[i].color));
                  }
              }
              
              // we might need to generate more colors if higher indices
              // are assigned
              for (i = 0; i < assignedColors.length; ++i) {
                  neededColors = Math.max(neededColors, assignedColors[i] + 1);
              }
  
              // produce colors as needed
              var colors = [], variation = 0;
              i = 0;
              while (colors.length < neededColors) {
                  var c;
                  if (options.colors.length == i) // check degenerate case
                      c = $.color.make(100, 100, 100);
                  else
                      c = $.color.parse(options.colors[i]);
  
                  // vary color if needed
                  var sign = variation % 2 == 1 ? -1 : 1;
                  c.scale('rgb', 1 + sign * Math.ceil(variation / 2) * 0.2)
  
                  // FIXME: if we're getting to close to something else,
                  // we should probably skip this one
                  colors.push(c);
                  
                  ++i;
                  if (i >= options.colors.length) {
                      i = 0;
                      ++variation;
                  }
              }
  
              // fill in the options
              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;
                  }
  
                  // 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,
                  i, j, k, m, length,
                  s, points, ps, x, y, axis, val, f, p;
  
              function initAxis(axis, number) {
                  if (!axis)
                      return;
                  
                  axis.datamin = topSentry;
                  axis.datamax = bottomSentry;
                  axis.used = false;
              }
  
              function updateAxis(axis, min, max) {
                  if (min < axis.datamin)
                      axis.datamin = min;
                  if (max > axis.datamax)
                      axis.datamax = max;
              }
  
              for (i = 0; i < xaxes.length; ++i)
                  initAxis(xaxes[i]);
              for (i = 0; i < yaxes.length; ++i)
                  initAxis(yaxes[i]);
              
              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];
  
                  var 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)) {
                          format.push({ y: true, number: true, required: false, defaultValue: 0 });
                          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
  
                  if (s.datapoints.pointsize == null)
                      s.datapoints.pointsize = format.length;
                  
                  ps = s.datapoints.pointsize;
                  points = s.datapoints.points;
  
                  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;
                                  }
  
                                  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.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;
  
                  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)
                              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 = s.bars.align == "left" ? 0 : -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(getUsedAxes(), function (i, axis) {
                  if (axis.datamin == topSentry)
                      axis.datamin = null;
                  if (axis.datamax == bottomSentry)
                      axis.datamax = null;
              });
          }
  
          function constructCanvas() {
              function makeCanvas(width, height) {
                  var c = document.createElement('canvas');
                  c.width = width;
                  c.height = height;
                  if (!c.getContext) // excanvas hack
                      c = window.G_vmlCanvasManager.initElement(c);
                  return c;
              }
              
              canvasWidth = placeholder.width();
              canvasHeight = placeholder.height();
              placeholder.html(""); // clear placeholder
              if (placeholder.css("position") == 'static')
                  placeholder.css("position", "relative"); // for positioning labels and overlay
  
              if (canvasWidth <= 0 || canvasHeight <= 0)
                  throw "Invalid dimensions for plot, width = " + canvasWidth + ", height = " + canvasHeight;
  
              if (window.G_vmlCanvasManager) // excanvas hack
                  window.G_vmlCanvasManager.init_(document); // make sure everything is setup
              
              // the canvas
              canvas = $(makeCanvas(canvasWidth, canvasHeight)).appendTo(placeholder).get(0);
              ctx = canvas.getContext("2d");
  
              // overlay canvas for interactive features
              overlay = $(makeCanvas(canvasWidth, canvasHeight)).css({ position: 'absolute', left: 0, top: 0 }).appendTo(placeholder).get(0);
              octx = overlay.getContext("2d");
              octx.stroke();
          }
  
          function bindEvents() {
              // we include the canvas in the event holder too, because IE 7
              // sometimes has trouble with the stacking order
              eventHolder = $([overlay, canvas]);
  
              // bind events
              if (options.grid.hoverable)
                  eventHolder.mousemove(onMouseMove);
  
              if (options.grid.clickable)
                  eventHolder.click(onClick);
  
              executeHooks(hooks.bindEvents, [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;
              
              if (axis.direction == "x") {
                  // precompute how much the axis is scaling a point
                  // in canvas space
                  s = axis.scale = plotWidth / (t(axis.max) - t(axis.min));
                  m = 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); };
              }
              else {
                  s = axis.scale = plotHeight / (t(axis.max) - t(axis.min));
                  m = t(axis.max);
                  
                  if (t == identity)
                      axis.p2c = function (p) { return (m - p) * s; };
                  else
                      axis.p2c = function (p) { return (m - t(p)) * s; };
                  if (!it)
                      axis.c2p = function (c) { return m - c / s; };
                  else
                      axis.c2p = function (c) { return it(m - c / s); };
              }
          }
  
          function measureTickLabels(axis) {
              if (!axis)
                  return;
              
              var opts = axis.options, i, ticks = axis.ticks || [], labels = [],
                  l, w = opts.labelWidth, h = opts.labelHeight, dummyDiv;
  
              function makeDummyDiv(labels, width) {
                  return $('<div style="position:absolute;top:-10000px;' + width + 'font-size:smaller">' +
                           '<div class="' + axis.direction + 'Axis ' + axis.direction + axis.n + 'Axis">'
                           + labels.join("") + '</div></div>')
                      .appendTo(placeholder);
              }
              
              if (axis.direction == "x") {
                  // to avoid measuring the widths of the labels (it's slow), we
                  // construct fixed-size boxes and put the labels inside
                  // them, we don't need the exact figures and the
                  // fixed-size box content is easy to center
                  if (w == null)
                      w = Math.floor(canvasWidth / (ticks.length > 0 ? ticks.length : 1));
  
                  // measure x label heights
                  if (h == null) {
                      labels = [];
                      for (i = 0; i < ticks.length; ++i) {
                          l = ticks[i].label;
                          if (l)
                              labels.push('<div class="tickLabel" style="float:left;width:' + w + 'px">' + l + '</div>');
                      }
  
                      if (labels.length > 0) {
                          // stick them all in the same div and measure
                          // collective height
                          labels.push('<div style="clear:left"></div>');
                          dummyDiv = makeDummyDiv(labels, "width:10000px;");
                          h = dummyDiv.height();
                          dummyDiv.remove();
                      }
                  }
              }
              else if (w == null || h == null) {
                  // calculate y label dimensions
                  for (i = 0; i < ticks.length; ++i) {
                      l = ticks[i].label;
                      if (l)
                          labels.push('<div class="tickLabel">' + l + '</div>');
                  }
                  
                  if (labels.length > 0) {
                      dummyDiv = makeDummyDiv(labels, "");
                      if (w == null)
                          w = dummyDiv.children().width();
                      if (h == null)
                          h = dummyDiv.find("div.tickLabel").height();
                      dummyDiv.remove();
                  }
              }
  
              if (w == null)
                  w = 0;
              if (h == null)
                  h = 0;
              
              axis.labelWidth = w;
              axis.labelHeight = h;
          }
  
          function computeAxisBox(axis) {
              if (!axis || (!axis.used && !(axis.labelWidth || axis.labelHeight)))
                  return;
  
              // find the bounding box of the axis by looking at label
              // widths/heights and ticks, make room by diminishing the
              // plotOffset
  
              var lw = axis.labelWidth,
                  lh = axis.labelHeight,
                  pos = axis.options.position,
                  tickLength = axis.options.tickLength,
                  axismargin = options.grid.axisMargin,
                  padding = options.grid.labelMargin,
                  all = axis.direction == "x" ? xaxes : yaxes,
                  index;
  
              // determine axis margin
              var samePosition = $.grep(all, function (a) {
                  return a && a.options.position == pos && (a.labelHeight || a.labelWidth);
              });
              if ($.inArray(axis, samePosition) == samePosition.length - 1)
                  axismargin = 0; // outermost
  
              // determine tick length - if we're innermost, we can use "full"
              if (tickLength == null)
                  tickLength = "full";
  
              var sameDirection = $.grep(all, function (a) {
                  return a && (a.labelHeight || a.labelWidth);
              });
  
              var innermost = $.inArray(axis, sameDirection) == 0;
              if (!innermost && tickLength == "full")
                  tickLength = 5;
                  
              if (!isNaN(+tickLength))
                  padding += +tickLength;
  
              // compute box
              if (axis.direction == "x") {
                  lh += padding;
                  
                  if (pos == "bottom") {
                      plotOffset.bottom += lh + axismargin;
                      axis.box = { top: canvasHeight - 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: canvasWidth - plotOffset.right, width: lw };
                  }
              }
  
               // save for future reference
              axis.position = pos;
              axis.tickLength = tickLength;
              axis.box.padding = padding;
              axis.innermost = innermost;
          }
  
          function fixupAxisBox(axis) {
              // set remaining bounding box coordinates
              if (axis.direction == "x") {
                  axis.box.left = plotOffset.left;
                  axis.box.width = plotWidth;
              }
              else {
                  axis.box.top = plotOffset.top;
                  axis.box.height = plotHeight;
              }
          }
          
          function setupGrid() {
              var axes = getUsedAxes(), j, k;
  
              // compute axis intervals
              for (k = 0; k < axes.length; ++k)
                  setRange(axes[k]);
  
              
              plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = 0;
              if (options.grid.show) {
                  // make the ticks
                  for (k = 0; k < axes.length; ++k) {
                      setupTickGeneration(axes[k]);
                      setTicks(axes[k]);
                      snapRangeToTicks(axes[k], axes[k].ticks);
                  }
  
                  // find labelWidth/Height, do this on all, not just
                  // used as we might need to reserve space for unused
                  // too if their labelWidth/Height is set
                  for (j = 0; j < xaxes.length; ++j)
                      measureTickLabels(xaxes[j]);
                  for (j = 0; j < yaxes.length; ++j)
                      measureTickLabels(yaxes[j]);
                      
                  // compute the axis boxes, start from the outside (reverse order)
                  for (j = xaxes.length - 1; j >= 0; --j)
                      computeAxisBox(xaxes[j]);
                  for (j = yaxes.length - 1; j >= 0; --j)
                      computeAxisBox(yaxes[j]);
  
                  // make sure we've got enough space for things that
                  // might stick out
                  var maxOutset = 0;
                  for (var i = 0; i < series.length; ++i)
                      maxOutset = Math.max(maxOutset, 2 * (series[i].points.radius + series[i].points.lineWidth/2));
  
                  for (var a in plotOffset) {
                      plotOffset[a] += options.grid.borderWidth;
                      plotOffset[a] = Math.max(maxOutset, plotOffset[a]);
                  }
              }
              
              plotWidth = canvasWidth - plotOffset.left - plotOffset.right;
              plotHeight = canvasHeight - plotOffset.bottom - plotOffset.top;
              
              // now we got the proper plotWidth/Height, we can compute the scaling
              for (k = 0; k < axes.length; ++k)
                  setTransformationHelpers(axes[k]);
  
              if (options.grid.show) {
                  for (k = 0; k < axes.length; ++k)
                      fixupAxisBox(axes[k]);
                  
                  insertAxisLabels();
              }
              
              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;
                  // alway 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 if (axis.direction == "x")
                   // heuristic based on the model a*sqrt(x) fitted to
                   // some reasonable data points
                  noTicks = 0.3 * Math.sqrt(canvasWidth);
              else
                  noTicks = 0.3 * Math.sqrt(canvasHeight);
  
              var delta = (axis.max - axis.min) / noTicks,
                  size, generator, unit, formatter, i, magn, norm;
  
              if (opts.mode == "time") {
                  // pretty handling of time
                  
                  // map of app. size of time units in milliseconds
                  var timeUnitSize = {
                      "second": 1000,
                      "minute": 60 * 1000,
                      "hour": 60 * 60 * 1000,
                      "day": 24 * 60 * 60 * 1000,
                      "month": 30 * 24 * 60 * 60 * 1000,
                      "year": 365.2425 * 24 * 60 * 60 * 1000
                  };
  
  
                  // the allowed tick sizes, after 1 year we use
                  // an integer algorithm
                  var spec = [
                      [1, "second"], [2, "second"], [5, "second"], [10, "second"],
                      [30, "second"], 
                      [1, "minute"], [2, "minute"], [5, "minute"], [10, "minute"],
                      [30, "minute"], 
                      [1, "hour"], [2, "hour"], [4, "hour"],
                      [8, "hour"], [12, "hour"],
                      [1, "day"], [2, "day"], [3, "day"],
                      [0.25, "month"], [0.5, "month"], [1, "month"],
                      [2, "month"], [3, "month"], [6, "month"],
                      [1, "year"]
                  ];
  
                  var minSize = 0;
                  if (opts.minTickSize != null) {
                      if (typeof opts.tickSize == "number")
                          minSize = opts.tickSize;
                      else
                          minSize = opts.minTickSize[0] * timeUnitSize[opts.minTickSize[1]];
                  }
  
                  for (var i = 0; i < spec.length - 1; ++i)
                      if (delta < (spec[i][0] * timeUnitSize[spec[i][1]]
                                   + spec[i + 1][0] * timeUnitSize[spec[i + 1][1]]) / 2
                         && spec[i][0] * timeUnitSize[spec[i][1]] >= minSize)
                          break;
                  size = spec[i][0];
                  unit = spec[i][1];
                  
                  // special-case the possibility of several years
                  if (unit == "year") {
                      magn = Math.pow(10, Math.floor(Math.log(delta / timeUnitSize.year) / Math.LN10));
                      norm = (delta / timeUnitSize.year) / magn;
                      if (norm < 1.5)
                          size = 1;
                      else if (norm < 3)
                          size = 2;
                      else if (norm < 7.5)
                          size = 5;
                      else
                          size = 10;
  
                      size *= magn;
                  }
  
                  axis.tickSize = opts.tickSize || [size, unit];
                  
                  generator = function(axis) {
                      var ticks = [],
                          tickSize = axis.tickSize[0], unit = axis.tickSize[1],
                          d = new Date(axis.min);
                      
                      var step = tickSize * timeUnitSize[unit];
  
                      if (unit == "second")
                          d.setUTCSeconds(floorInBase(d.getUTCSeconds(), tickSize));
                      if (unit == "minute")
                          d.setUTCMinutes(floorInBase(d.getUTCMinutes(), tickSize));
                      if (unit == "hour")
                          d.setUTCHours(floorInBase(d.getUTCHours(), tickSize));
                      if (unit == "month")
                          d.setUTCMonth(floorInBase(d.getUTCMonth(), tickSize));
                      if (unit == "year")
                          d.setUTCFullYear(floorInBase(d.getUTCFullYear(), tickSize));
                      
                      // reset smaller components
                      d.setUTCMilliseconds(0);
                      if (step >= timeUnitSize.minute)
                          d.setUTCSeconds(0);
                      if (step >= timeUnitSize.hour)
                          d.setUTCMinutes(0);
                      if (step >= timeUnitSize.day)
                          d.setUTCHours(0);
                      if (step >= timeUnitSize.day * 4)
                          d.setUTCDate(1);
                      if (step >= timeUnitSize.year)
                          d.setUTCMonth(0);
  
  
                      var carry = 0, v = Number.NaN, prev;
                      do {
                          prev = v;
                          v = d.getTime();
                          ticks.push(v);
                          if (unit == "month") {
                              if (tickSize < 1) {
                                  // a bit complicated - we'll divide the month
                                  // up but we need to take care of fractions
                                  // so we don't end up in the middle of a day
                                  d.setUTCDate(1);
                                  var start = d.getTime();
                                  d.setUTCMonth(d.getUTCMonth() + 1);
                                  var end = d.getTime();
                                  d.setTime(v + carry * timeUnitSize.hour + (end - start) * tickSize);
                                  carry = d.getUTCHours();
                                  d.setUTCHours(0);
                              }
                              else
                                  d.setUTCMonth(d.getUTCMonth() + tickSize);
                          }
                          else if (unit == "year") {
                              d.setUTCFullYear(d.getUTCFullYear() + tickSize);
                          }
                          else
                              d.setTime(v + step);
                      } while (v < axis.max && v != prev);
  
                      return ticks;
                  };
  
                  formatter = function (v, axis) {
                      var d = new Date(v);
  
                      // first check global format
                      if (opts.timeformat != null)
                          return $.plot.formatDate(d, opts.timeformat, opts.monthNames);
                      
                      var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
                      var span = axis.max - axis.min;
                      var suffix = (opts.twelveHourClock) ? " %p" : "";
                      
                      if (t < timeUnitSize.minute)
                          fmt = "%h:%M:%S" + suffix;
                      else if (t < timeUnitSize.day) {
                          if (span < 2 * timeUnitSize.day)
                              fmt = "%h:%M" + suffix;
                          else
                              fmt = "%b %d %h:%M" + suffix;
                      }
                      else if (t < timeUnitSize.month)
                          fmt = "%b %d";
                      else if (t < timeUnitSize.year) {
                          if (span < timeUnitSize.year)
                              fmt = "%b";
                          else
                              fmt = "%b %y";
                      }
                      else
                          fmt = "%y";
                      
                      return $.plot.formatDate(d, fmt, opts.monthNames);
                  };
              }
              else {
                  // pretty rounding of base-10 numbers
                  var maxDec = opts.tickDecimals;
                  var dec = -Math.floor(Math.log(delta) / Math.LN10);
                  if (maxDec != null && dec > maxDec)
                      dec = maxDec;
  
                  magn = Math.pow(10, -dec);
                  norm = delta / magn; // norm is between 1.0 and 10.0
                  
                  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.tickDecimals = Math.max(0, maxDec != null ? maxDec : dec);
                  axis.tickSize = opts.tickSize || size;
  
                  generator = function (axis) {
                      var ticks = [];
  
                      // spew out all possible ticks
                      var 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;
                  };
  
                  formatter = function (v, axis) {
                      return v.toFixed(axis.tickDecimals);
                  };
              }
  
              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 = generator(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]);
                      }
                      
                      generator = 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 != "time" && opts.tickDecimals == null) {
                          var extraDec = Math.max(0, -Math.floor(Math.log(delta) / Math.LN10) + 1),
                              ts = generator(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;
                      }
                  }
              }
  
              axis.tickGenerator = generator;
              if ($.isFunction(opts.tickFormatter))
                  axis.tickFormatter = function (v, axis) { return "" + opts.tickFormatter(v, axis); };
              else
                  axis.tickFormatter = formatter;
          }
          
          function setTicks(axis) {
              axis.ticks = [];
  
              var oticks = axis.options.ticks, ticks = null;
              if (oticks == null || (typeof oticks == "number" && oticks > 0))
                  ticks = axis.tickGenerator(axis);
              else if (oticks) {
                  if ($.isFunction(oticks))
                      // generate the ticks
                      ticks = oticks({ min: axis.min, max: axis.max });
                  else
                      ticks = oticks;
              }
  
              // clean up/labelify the supplied ticks, copy them over
              var i, v;
              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);
                  axis.ticks[i] = { v: v, label: label };
              }
          }
  
          function snapRangeToTicks(axis, ticks) {
              if (axis.options.autoscaleMargin != null && 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() {
              ctx.clearRect(0, 0, canvasWidth, canvasHeight);
  
              var grid = options.grid;
              
              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();
          }
  
          function extractRange(ranges, coord) {
              var axis, from, to, axes, key;
  
              axes = getUsedAxes();
              for (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 drawGrid() {
              var i;
              
              ctx.save();
              ctx.translate(plotOffset.left, plotOffset.top);
  
              // draw background, if any
              if (options.grid.backgroundColor) {
                  ctx.fillStyle = getColorOrGradient(options.grid.backgroundColor, plotHeight, 0, "rgba(255, 255, 255, 0)");
                  ctx.fillRect(0, 0, plotWidth, plotHeight);
              }
  
              // draw markings
              var markings = options.grid.markings;
              if (markings) {
                  if ($.isFunction(markings)) {
                      var 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);
  
                      if (xrange.from == xrange.to && yrange.from == yrange.to)
                          continue;
  
                      // then draw
                      xrange.from = xrange.axis.p2c(xrange.from);
                      xrange.to = xrange.axis.p2c(xrange.to);
                      yrange.from = yrange.axis.p2c(yrange.from);
                      yrange.to = yrange.axis.p2c(yrange.to);
                      
                      if (xrange.from == xrange.to || yrange.from == yrange.to) {
                          // draw line
                          ctx.beginPath();
                          ctx.strokeStyle = m.color || options.grid.markingsColor;
                          ctx.lineWidth = m.lineWidth || options.grid.markingsLineWidth;
                          ctx.moveTo(xrange.from, yrange.from);
                          ctx.lineTo(xrange.to, yrange.to);
                          ctx.stroke();
                      }
                      else {
                          // fill area
                          ctx.fillStyle = m.color || options.grid.markingsColor;
                          ctx.fillRect(xrange.from, yrange.to,
                                       xrange.to - xrange.from,
                                       yrange.from - yrange.to);
                      }
                  }
              }
              
              // draw the ticks
              var axes = getUsedAxes(), 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;
  
                  ctx.strokeStyle = axis.options.tickColor || $.color.parse(axis.options.color).scale('a', 0.22).toString();
                  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.beginPath();
                      xoff = yoff = 0;
                      if (axis.direction == "x")
                          xoff = plotWidth;
                      else
                          yoff = plotHeight;
                      
                      if (ctx.lineWidth == 1) {
                          x = Math.floor(x) + 0.5;
                          y = Math.floor(y) + 0.5;
                      }
  
                      ctx.moveTo(x, y);
                      ctx.lineTo(x + xoff, y + yoff);
                      ctx.stroke();
                  }
  
                  // draw ticks
                  ctx.beginPath();
                  for (i = 0; i < axis.ticks.length; ++i) {
                      var v = axis.ticks[i].v;
                      
                      xoff = yoff = 0;
  
                      if (v < axis.min || v > axis.max
                          // skip those lying on the axes if we got a border
                          || (t == "full" && 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) {
                  ctx.lineWidth = bw;
                  ctx.strokeStyle = options.grid.borderColor;
                  ctx.strokeRect(-bw/2, -bw/2, plotWidth + bw, plotHeight + bw);
              }
  
              ctx.restore();
          }
  
          function insertAxisLabels() {
              placeholder.find(".tickLabels").remove();
              
              var html = ['<div class="tickLabels" style="font-size:smaller">'];
  
              var axes = getUsedAxes();
              for (var j = 0; j < axes.length; ++j) {
                  var axis = axes[j], box = axis.box;
                  //debug: html.push('<div style="position:absolute;opacity:0.10;background-color:red;left:' + box.left + 'px;top:' + box.top + 'px;width:' + box.width +  'px;height:' + box.height + 'px"></div>')
                  html.push('<div class="' + axis.direction + 'Axis ' + axis.direction + axis.n + 'Axis" style="color:' + axis.options.color + '">');
                  for (var i = 0; i < axis.ticks.length; ++i) {
                      var tick = axis.ticks[i];
                      if (!tick.label || tick.v < axis.min || tick.v > axis.max)
                          continue;
  
                      var pos = {}, align;
                      
                      if (axis.direction == "x") {
                          align = "center";
                          pos.left = Math.round(plotOffset.left + axis.p2c(tick.v) - axis.labelWidth/2);
                          if (axis.position == "bottom")
                              pos.top = box.top + box.padding;
                          else
                              pos.bottom = canvasHeight - (box.top + box.height - box.padding);
                      }
                      else {
                          pos.top = Math.round(plotOffset.top + axis.p2c(tick.v) - axis.labelHeight/2);
                          if (axis.position == "left") {
                              pos.right = canvasWidth - (box.left + box.width - box.padding)
                              align = "right";
                          }
                          else {
                              pos.left = box.left + box.padding;
                              align = "left";
                          }
                      }
  
                      pos.width = axis.labelWidth;
  
                      var style = ["position:absolute", "text-align:" + align ];
                      for (var a in pos)
                          style.push(a + ":" + pos[a] + "px")
                      
                      html.push('<div class="tickLabel" style="' + style.join(';') + '">' + tick.label + '</div>');
                  }
                  html.push('</div>');
              }
  
              html.push('</div>');
  
              placeholder.append(html.join(""));
          }
  
          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, circumference, axisx, axisy) {
                  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();
                      ctx.arc(axisx.p2c(x), axisy.p2c(y) + offset, radius, 0, circumference, false);
                      if (fillStyle) {
                          ctx.fillStyle = fillStyle;
                          ctx.fill();
                      }
                      ctx.stroke();
                  }
              }
              
              ctx.save();
              ctx.translate(plotOffset.left, plotOffset.top);
  
              var lw = series.lines.lineWidth,
                  sw = series.shadowSize,
                  radius = series.points.radius;
              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, Math.PI,
                             series.xaxis, series.yaxis);
  
                  ctx.strokeStyle = "rgba(0,0,0,0.2)";
                  plotPoints(series.datapoints, radius, null, w/2, Math.PI,
                             series.xaxis, series.yaxis);
              }
  
              ctx.lineWidth = lw;
              ctx.strokeStyle = series.color;
              plotPoints(series.datapoints, radius,
                         getFillStyle(series.points, series.color), 0, 2 * Math.PI,
                         series.xaxis, series.yaxis);
              ctx.restore();
          }
  
          function drawBar(x, y, b, barLeft, barRight, offset, 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.beginPath();
                  c.moveTo(left, bottom);
                  c.lineTo(left, top);
                  c.lineTo(right, top);
                  c.lineTo(right, bottom);
                  c.fillStyle = fillStyleCallback(bottom, top);
                  c.fill();
              }
  
              // draw outline
              if (lineWidth > 0 && (drawLeft || drawRight || drawTop || drawBottom)) {
                  c.beginPath();
  
                  // FIXME: inline moveTo is buggy with excanvas
                  c.moveTo(left, bottom + offset);
                  if (drawLeft)
                      c.lineTo(left, top + offset);
                  else
                      c.moveTo(left, top + offset);
                  if (drawTop)
                      c.lineTo(right, top + offset);
                  else
                      c.moveTo(right, top + offset);
                  if (drawRight)
                      c.lineTo(right, bottom + offset);
                  else
                      c.moveTo(right, bottom + offset);
                  if (drawBottom)
                      c.lineTo(left, bottom + offset);
                  else
                      c.moveTo(left, bottom + offset);
                  c.stroke();
              }
          }
          
          function drawSeriesBars(series) {
              function plotBars(datapoints, barLeft, barRight, offset, 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, offset, 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 = series.bars.align == "left" ? 0 : -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, 0, 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() {
              placeholder.find(".legend").remove();
  
              if (!options.legend.show)
                  return;
              
              var fragments = [], rowStarted = false,
                  lf = options.legend.labelFormatter, s, label;
              for (var i = 0; i < series.length; ++i) {
                  s = series[i];
                  label = s.label;
                  if (!label)
                      continue;
                  
                  if (i % options.legend.noColumns == 0) {
                      if (rowStarted)
                          fragments.push('</tr>');
                      fragments.push('<tr>');
                      rowStarted = true;
                  }
  
                  if (lf)
                      label = lf(label, s);
                  
                  fragments.push(
                      '<td class="legendColorBox"><div style="border:1px solid ' + options.legend.labelBoxBorderColor + ';padding:1px"><div style="width:4px;height:0;border:5px solid ' + s.color + ';overflow:hidden"></div></div></td>' +
                      '<td class="legendLabel">' + 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;
  
              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,
                      ps = s.datapoints.pointsize,
                      mx = axisx.c2p(mouseX), // precompute some stuff to make the loop faster
                      my = axisy.c2p(mouseY),
                      maxx = maxDistance / axisx.scale,
                      maxy = maxDistance / axisy.scale;
  
                  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 = s.bars.align == "left" ? 0 : -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 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);
                  item.pageY = parseInt(item.series.yaxis.p2c(item.datapoint[1]) + offset.top + plotOffset.top);
              }
  
              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 == item.datapoint))
                          unhighlight(h.series, h.point);
                  }
                  
                  if (item)
                      highlight(item.series, item.datapoint, eventname);
              }
              
              placeholder.trigger(eventname, [ pos, item ]);
          }
  
          function triggerRedrawOverlay() {
              if (!redrawTimeout)
                  redrawTimeout = setTimeout(drawOverlay, 30);
          }
  
          function drawOverlay() {
              redrawTimeout = null;
  
              // draw highlights
              octx.save();
              octx.clearRect(0, 0, canvasWidth, canvasHeight);
              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();
              }
              
              if (typeof s == "number")
                  s = series[s];
  
              if (typeof point == "number")
                  point = s.data[point];
  
              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;
              
              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 = $.color.parse(series.color).scale('a', 0.5).toString();
              var radius = 1.5 * pointRadius;
              octx.beginPath();
              octx.arc(axisx.p2c(x), axisy.p2c(y), radius, 0, 2 * Math.PI, false);
              octx.stroke();
          }
  
          function drawBarHighlight(series, point) {
              octx.lineWidth = series.bars.lineWidth;
              octx.strokeStyle = $.color.parse(series.color).scale('a', 0.5).toString();
              var fillStyle = $.color.parse(series.color).scale('a', 0.5).toString();
              var barLeft = series.bars.align == "left" ? 0 : -series.bars.barWidth/2;
              drawBar(point[0], point[1], point[2] || 0, barLeft, barLeft + series.bars.barWidth,
                      0, 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;
              }
          }
      }
  
      $.plot = function(placeholder, data, options) {
          //var t0 = new Date();
          var plot = new Plot($(placeholder), data, options, $.plot.plugins);
          //(window.console ? console.log : alert)("time used (msecs): " + ((new Date()).getTime() - t0.getTime()));
          return plot;
      };
  
      $.plot.plugins = [];
  
      // returns a string with the date d formatted according to fmt
      $.plot.formatDate = function(d, fmt, monthNames) {
          var leftPad = function(n) {
              n = "" + n;
              return n.length == 1 ? "0" + n : n;
          };
          
          var r = [];
          var escape = false, padNext = false;
          var hours = d.getUTCHours();
          var isAM = hours < 12;
          if (monthNames == null)
              monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
  
          if (fmt.search(/%p|%P/) != -1) {
              if (hours > 12) {
                  hours = hours - 12;
              } else if (hours == 0) {
                  hours = 12;
              }
          }
          for (var i = 0; i < fmt.length; ++i) {
              var c = fmt.charAt(i);
              
              if (escape) {
                  switch (c) {
                  case 'h': c = "" + hours; break;
                  case 'H': c = leftPad(hours); break;
                  case 'M': c = leftPad(d.getUTCMinutes()); break;
                  case 'S': c = leftPad(d.getUTCSeconds()); break;
                  case 'd': c = "" + d.getUTCDate(); break;
                  case 'm': c = "" + (d.getUTCMonth() + 1); break;
                  case 'y': c = "" + d.getUTCFullYear(); break;
                  case 'b': c = "" + monthNames[d.getUTCMonth()]; break;
                  case 'p': c = (isAM) ? ("" + "am") : ("" + "pm"); break;
                  case 'P': c = (isAM) ? ("" + "AM") : ("" + "PM"); break;
                  case '0': c = ""; padNext = true; break;
                  }
                  if (c && padNext) {
                      c = leftPad(c);
                      padNext = false;
                  }
                  r.push(c);
                  if (!padNext)
                      escape = false;
              }
              else {
                  if (c == "%")
                      escape = true;
                  else
                      r.push(c);
              }
          }
          return r.join("");
      };
      
      // round to nearby lower multiple of base
      function floorInBase(n, base) {
          return base * Math.floor(n / base);
      }
      
  })(jQuery);
  