text: nv.models.pieChart = function() {
    "use strict";
    //============================================================
    // Public Variables with Default Settings
    //------------------------------------------------------------
  
    var pie = nv.models.pie()
      , legend = nv.models.legend()
      ;
  
    var margin = {top: 30, right: 20, bottom: 20, left: 20}
      , width = null
      , height = null
      , showLegend = true
      , color = nv.utils.defaultColor()
      , tooltips = true
      , tooltip = function(key, y, e, graph) {
          return '<h3>' + key + '</h3>' +
                 '<p>' +  y + '</p>'
        }
      , state = {}
      , defaultState = null
      , noData = "No Data Available."
      , dispatch = d3.dispatch('tooltipShow', 'tooltipHide', 'stateChange', 'changeState')
      ;
  
    //============================================================
  
  
    //============================================================
    // Private Variables
    //------------------------------------------------------------
  
    var showTooltip = function(e, offsetElement) {
      var tooltipLabel = pie.description()(e.point) || pie.x()(e.point)
      var left = e.pos[0] + ( (offsetElement && offsetElement.offsetLeft) || 0 ),
          top = e.pos[1] + ( (offsetElement && offsetElement.offsetTop) || 0),
          y = pie.valueFormat()(pie.y()(e.point)),
          content = tooltip(tooltipLabel, y, e, chart);
  
      nv.tooltip.show([left, top], content, e.value < 0 ? 'n' : 's', null, offsetElement);
    };
  
    //============================================================
  
  
    function chart(selection) {
      selection.each(function(data) {
        var container = d3.select(this),
            that = this;
  
        var availableWidth = (width || parseInt(container.style('width')) || 960)
                               - margin.left - margin.right,
            availableHeight = (height || parseInt(container.style('height')) || 400)
                               - margin.top - margin.bottom;
  
        chart.update = function() { container.transition().call(chart); };
        chart.container = this;
  
        //set state.disabled
        state.disabled = data.map(function(d) { return !!d.disabled });
  
        if (!defaultState) {
          var key;
          defaultState = {};
          for (key in state) {
            if (state[key] instanceof Array)
              defaultState[key] = state[key].slice(0);
            else
              defaultState[key] = state[key];
          }
        }
  
        //------------------------------------------------------------
        // Display No Data message if there's nothing to show.
  
        if (!data || !data.length) {
          var noDataText = container.selectAll('.nv-noData').data([noData]);
  
          noDataText.enter().append('text')
            .attr('class', 'nvd3 nv-noData')
            .attr('dy', '-.7em')
            .style('text-anchor', 'middle');
  
          noDataText
            .attr('x', margin.left + availableWidth / 2)
            .attr('y', margin.top + availableHeight / 2)
            .text(function(d) { return d });
  
          return chart;
        } else {
          container.selectAll('.nv-noData').remove();
        }
  
        //------------------------------------------------------------
  
  
        //------------------------------------------------------------
        // Setup containers and skeleton of chart
  
        var wrap = container.selectAll('g.nv-wrap.nv-pieChart').data([data]);
        var gEnter = wrap.enter().append('g').attr('class', 'nvd3 nv-wrap nv-pieChart').append('g');
        var g = wrap.select('g');
  
        gEnter.append('g').attr('class', 'nv-pieWrap');
        gEnter.append('g').attr('class', 'nv-legendWrap');
  
        //------------------------------------------------------------
  
  
        //------------------------------------------------------------
        // Legend
  
        if (showLegend) {
          legend
            .width( availableWidth )
            .key(pie.x());
  
          wrap.select('.nv-legendWrap')
              .datum(data)
              .call(legend);
  
          if ( margin.top != legend.height()) {
            margin.top = legend.height();
            availableHeight = (height || parseInt(container.style('height')) || 400)
                               - margin.top - margin.bottom;
          }
  
          wrap.select('.nv-legendWrap')
              .attr('transform', 'translate(0,' + (-margin.top) +')');
        }
  
        //------------------------------------------------------------
  
  
        wrap.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
  
  
        //------------------------------------------------------------
        // Main Chart Component(s)
  
        pie
          .width(availableWidth)
          .height(availableHeight);
  
  
        var pieWrap = g.select('.nv-pieWrap')
            .datum([data]);
  
        d3.transition(pieWrap).call(pie);
  
        //------------------------------------------------------------
  
  
        //============================================================
        // Event Handling/Dispatching (in chart's scope)
        //------------------------------------------------------------
  
        legend.dispatch.on('stateChange', function(newState) {
          state = newState;
          dispatch.stateChange(state);
          chart.update();
        });
  
        pie.dispatch.on('elementMouseout.tooltip', function(e) {
          dispatch.tooltipHide(e);
        });
  
        // Update chart from a state object passed to event handler
        dispatch.on('changeState', function(e) {
  
          if (typeof e.disabled !== 'undefined') {
            data.forEach(function(series,i) {
              series.disabled = e.disabled[i];
            });
  
            state.disabled = e.disabled;
          }
  
          chart.update();
        });
  
        //============================================================
  
  
      });
  
      return chart;
    }
  
    //============================================================
    // Event Handling/Dispatching (out of chart's scope)
    //------------------------------------------------------------
  
    pie.dispatch.on('elementMouseover.tooltip', function(e) {
      e.pos = [e.pos[0] +  margin.left, e.pos[1] + margin.top];
      dispatch.tooltipShow(e);
    });
  
    dispatch.on('tooltipShow', function(e) {
      if (tooltips) showTooltip(e);
    });
  
    dispatch.on('tooltipHide', function() {
      if (tooltips) nv.tooltip.cleanup();
    });
  
    //============================================================
  
  
    //============================================================
    // Expose Public Variables
    //------------------------------------------------------------
  
    // expose chart's sub-components
    chart.legend = legend;
    chart.dispatch = dispatch;
    chart.pie = pie;
  
    d3.rebind(chart, pie, 'valueFormat', 'labelFormat', 'values', 'x', 'y', 'description', 'id', 'showLabels', 'donutLabelsOutside', 'pieLabelsOutside', 'labelType', 'donut', 'donutRatio', 'labelThreshold');
    chart.options = nv.utils.optionsFunc.bind(chart);
  
    chart.margin = function(_) {
      if (!arguments.length) return margin;
      margin.top    = typeof _.top    != 'undefined' ? _.top    : margin.top;
      margin.right  = typeof _.right  != 'undefined' ? _.right  : margin.right;
      margin.bottom = typeof _.bottom != 'undefined' ? _.bottom : margin.bottom;
      margin.left   = typeof _.left   != 'undefined' ? _.left   : margin.left;
      return chart;
    };
  
    chart.width = function(_) {
      if (!arguments.length) return width;
      width = _;
      return chart;
    };
  
    chart.height = function(_) {
      if (!arguments.length) return height;
      height = _;
      return chart;
    };
  
    chart.color = function(_) {
      if (!arguments.length) return color;
      color = nv.utils.getColor(_);
      legend.color(color);
      pie.color(color);
      return chart;
    };
  
    chart.showLegend = function(_) {
      if (!arguments.length) return showLegend;
      showLegend = _;
      return chart;
    };
  
    chart.tooltips = function(_) {
      if (!arguments.length) return tooltips;
      tooltips = _;
      return chart;
    };
  
    chart.tooltipContent = function(_) {
      if (!arguments.length) return tooltip;
      tooltip = _;
      return chart;
    };
  
    chart.state = function(_) {
      if (!arguments.length) return state;
      state = _;
      return chart;
    };
  
    chart.defaultState = function(_) {
      if (!arguments.length) return defaultState;
      defaultState = _;
      return chart;
    };
  
    chart.noData = function(_) {
      if (!arguments.length) return noData;
      noData = _;
      return chart;
    };
  
    //============================================================
  
  
    return chart;
  }
  