text: 
  nv.models.multiBar = function() {
    "use strict";
    //============================================================
    // Public Variables with Default Settings
    //------------------------------------------------------------
  
    var margin = {top: 0, right: 0, bottom: 0, left: 0}
      , width = 960
      , height = 500
      , x = d3.scale.ordinal()
      , y = d3.scale.linear()
      , id = Math.floor(Math.random() * 10000) //Create semi-unique ID in case user doesn't select one
      , getX = function(d) { return d.x }
      , getY = function(d) { return d.y }
      , forceY = [0] // 0 is forced by default.. this makes sense for the majority of bar graphs... user can always do chart.forceY([]) to remove
      , clipEdge = true
      , stacked = false
      , stackOffset = 'zero' // options include 'silhouette', 'wiggle', 'expand', 'zero', or a custom function
      , color = nv.utils.defaultColor()
      , hideable = false
      , barColor = null // adding the ability to set the color for each rather than the whole group
      , disabled // used in conjunction with barColor to communicate from multiBarHorizontalChart what series are disabled
      , delay = 1200
      , xDomain
      , yDomain
      , xRange
      , yRange
      , groupSpacing = 0.1
      , dispatch = d3.dispatch('chartClick', 'elementClick', 'elementDblClick', 'elementMouseover', 'elementMouseout')
      ;
  
    //============================================================
  
  
    //============================================================
    // Private Variables
    //------------------------------------------------------------
  
    var x0, y0 //used to store previous scales
        ;
  
    //============================================================
  
  
    function chart(selection) {
      selection.each(function(data) {
        var availableWidth = width - margin.left - margin.right,
            availableHeight = height - margin.top - margin.bottom,
            container = d3.select(this);
  
        if(hideable && data.length) hideable = [{
          values: data[0].values.map(function(d) {
          return {
            x: d.x,
            y: 0,
            series: d.series,
            size: 0.01
          };}
        )}];
  
        if (stacked)
          data = d3.layout.stack()
                   .offset(stackOffset)
                   .values(function(d){ return d.values })
                   .y(getY)
                   (!data.length && hideable ? hideable : data);
  
  
        //add series index to each data point for reference
        data = data.map(function(series, i) {
          series.values = series.values.map(function(point) {
            point.series = i;
            return point;
          });
          return series;
        });
  
  
        //------------------------------------------------------------
        // HACK for negative value stacking
        if (stacked)
          data[0].values.map(function(d,i) {
            var posBase = 0, negBase = 0;
            data.map(function(d) {
              var f = d.values[i]
              f.size = Math.abs(f.y);
              if (f.y<0)  {
                f.y1 = negBase;
                negBase = negBase - f.size;
              } else
              { 
                f.y1 = f.size + posBase;
                posBase = posBase + f.size;
              }
            });
          });
  
        //------------------------------------------------------------
        // Setup Scales
  
        // remap and flatten the data for use in calculating the scales' domains
        var seriesData = (xDomain && yDomain) ? [] : // if we know xDomain and yDomain, no need to calculate
              data.map(function(d) {
                return d.values.map(function(d,i) {
                  return { x: getX(d,i), y: getY(d,i), y0: d.y0, y1: d.y1 }
                })
              });
  
        x   .domain(xDomain || d3.merge(seriesData).map(function(d) { return d.x }))
            .rangeBands(xRange || [0, availableWidth], groupSpacing);
  
        //y   .domain(yDomain || d3.extent(d3.merge(seriesData).map(function(d) { return d.y + (stacked ? d.y1 : 0) }).concat(forceY)))
        y   .domain(yDomain || d3.extent(d3.merge(seriesData).map(function(d) { return stacked ? (d.y > 0 ? d.y1 : d.y1 + d.y ) : d.y }).concat(forceY)))
            .range(yRange || [availableHeight, 0]);
  
        // If scale's domain don't have a range, slightly adjust to make one... so a chart can show a single data point
        if (x.domain()[0] === x.domain()[1])
          x.domain()[0] ?
              x.domain([x.domain()[0] - x.domain()[0] * 0.01, x.domain()[1] + x.domain()[1] * 0.01])
            : x.domain([-1,1]);
  
        if (y.domain()[0] === y.domain()[1])
          y.domain()[0] ?
              y.domain([y.domain()[0] + y.domain()[0] * 0.01, y.domain()[1] - y.domain()[1] * 0.01])
            : y.domain([-1,1]);
  
  
        x0 = x0 || x;
        y0 = y0 || y;
  
        //------------------------------------------------------------
  
  
        //------------------------------------------------------------
        // Setup containers and skeleton of chart
  
        var wrap = container.selectAll('g.nv-wrap.nv-multibar').data([data]);
        var wrapEnter = wrap.enter().append('g').attr('class', 'nvd3 nv-wrap nv-multibar');
        var defsEnter = wrapEnter.append('defs');
        var gEnter = wrapEnter.append('g');
        var g = wrap.select('g')
  
        gEnter.append('g').attr('class', 'nv-groups');
  
        wrap.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
  
        //------------------------------------------------------------
  
  
  
        defsEnter.append('clipPath')
            .attr('id', 'nv-edge-clip-' + id)
          .append('rect');
        wrap.select('#nv-edge-clip-' + id + ' rect')
            .attr('width', availableWidth)
            .attr('height', availableHeight);
  
        g   .attr('clip-path', clipEdge ? 'url(#nv-edge-clip-' + id + ')' : '');
  
  
  
        var groups = wrap.select('.nv-groups').selectAll('.nv-group')
            .data(function(d) { return d }, function(d,i) { return i });
        groups.enter().append('g')
            .style('stroke-opacity', 1e-6)
            .style('fill-opacity', 1e-6);
        groups.exit()
          .transition()
          .selectAll('rect.nv-bar')
          .delay(function(d,i) { 
               return i * delay/ data[0].values.length;
          })
            .attr('y', function(d) { return stacked ? y0(d.y0) : y0(0) })
            .attr('height', 0)
            .remove();
        groups
            .attr('class', function(d,i) { return 'nv-group nv-series-' + i })
            .classed('hover', function(d) { return d.hover })
            .style('fill', function(d,i){ return color(d, i) })
            .style('stroke', function(d,i){ return color(d, i) });
        groups
            .transition()
            .style('stroke-opacity', 1)
            .style('fill-opacity', .75);
  
  
        var bars = groups.selectAll('rect.nv-bar')
            .data(function(d) { return (hideable && !data.length) ? hideable.values : d.values });
  
        bars.exit().remove();
  
  
        var barsEnter = bars.enter().append('rect')
            .attr('class', function(d,i) { return getY(d,i) < 0 ? 'nv-bar negative' : 'nv-bar positive'})
            .attr('x', function(d,i,j) {
                return stacked ? 0 : (j * x.rangeBand() / data.length )
            })
            .attr('y', function(d) { return y0(stacked ? d.y0 : 0) })
            .attr('height', 0)
            .attr('width', x.rangeBand() / (stacked ? 1 : data.length) )
            .attr('transform', function(d,i) { return 'translate(' + x(getX(d,i)) + ',0)'; })
            ;
        bars
            .style('fill', function(d,i,j){ return color(d, j, i);  })
            .style('stroke', function(d,i,j){ return color(d, j, i); })
            .on('mouseover', function(d,i) { //TODO: figure out why j works above, but not here
              d3.select(this).classed('hover', true);
              dispatch.elementMouseover({
                value: getY(d,i),
                point: d,
                series: data[d.series],
                pos: [x(getX(d,i)) + (x.rangeBand() * (stacked ? data.length / 2 : d.series + .5) / data.length), y(getY(d,i) + (stacked ? d.y0 : 0))],  // TODO: Figure out why the value appears to be shifted
                pointIndex: i,
                seriesIndex: d.series,
                e: d3.event
              });
            })
            .on('mouseout', function(d,i) {
              d3.select(this).classed('hover', false);
              dispatch.elementMouseout({
                value: getY(d,i),
                point: d,
                series: data[d.series],
                pointIndex: i,
                seriesIndex: d.series,
                e: d3.event
              });
            })
            .on('click', function(d,i) {
              dispatch.elementClick({
                value: getY(d,i),
                point: d,
                series: data[d.series],
                pos: [x(getX(d,i)) + (x.rangeBand() * (stacked ? data.length / 2 : d.series + .5) / data.length), y(getY(d,i) + (stacked ? d.y0 : 0))],  // TODO: Figure out why the value appears to be shifted
                pointIndex: i,
                seriesIndex: d.series,
                e: d3.event
              });
              d3.event.stopPropagation();
            })
            .on('dblclick', function(d,i) {
              dispatch.elementDblClick({
                value: getY(d,i),
                point: d,
                series: data[d.series],
                pos: [x(getX(d,i)) + (x.rangeBand() * (stacked ? data.length / 2 : d.series + .5) / data.length), y(getY(d,i) + (stacked ? d.y0 : 0))],  // TODO: Figure out why the value appears to be shifted
                pointIndex: i,
                seriesIndex: d.series,
                e: d3.event
              });
              d3.event.stopPropagation();
            });
        bars
            .attr('class', function(d,i) { return getY(d,i) < 0 ? 'nv-bar negative' : 'nv-bar positive'})
            .transition()
            .attr('transform', function(d,i) { return 'translate(' + x(getX(d,i)) + ',0)'; })
  
        if (barColor) {
          if (!disabled) disabled = data.map(function() { return true });
          bars
            .style('fill', function(d,i,j) { return d3.rgb(barColor(d,i)).darker(  disabled.map(function(d,i) { return i }).filter(function(d,i){ return !disabled[i]  })[j]   ).toString(); })
            .style('stroke', function(d,i,j) { return d3.rgb(barColor(d,i)).darker(  disabled.map(function(d,i) { return i }).filter(function(d,i){ return !disabled[i]  })[j]   ).toString(); });
        }
  
  
        if (stacked)
            bars.transition()
              .delay(function(d,i) { 
  
                    return i * delay / data[0].values.length;
              })
              .attr('y', function(d,i) {
  
                return y((stacked ? d.y1 : 0));
              })
              .attr('height', function(d,i) {
                return Math.max(Math.abs(y(d.y + (stacked ? d.y0 : 0)) - y((stacked ? d.y0 : 0))),1);
              })
              .attr('x', function(d,i) {
                    return stacked ? 0 : (d.series * x.rangeBand() / data.length )
              })
              .attr('width', x.rangeBand() / (stacked ? 1 : data.length) );
        else
            bars.transition()
              .delay(function(d,i) { 
                  return i * delay/ data[0].values.length;
              })
              .attr('x', function(d,i) {
                return d.series * x.rangeBand() / data.length
              })
              .attr('width', x.rangeBand() / data.length)
              .attr('y', function(d,i) {
                  return getY(d,i) < 0 ?
                          y(0) :
                          y(0) - y(getY(d,i)) < 1 ?
                            y(0) - 1 :
                          y(getY(d,i)) || 0;
              })
              .attr('height', function(d,i) {
                  return Math.max(Math.abs(y(getY(d,i)) - y(0)),1) || 0;
              });
  
  
  
        //store old scales for use in transitions on update
        x0 = x.copy();
        y0 = y.copy();
  
      });
  
      return chart;
    }
  
  
    //============================================================
    // Expose Public Variables
    //------------------------------------------------------------
  
    chart.dispatch = dispatch;
  
    chart.options = nv.utils.optionsFunc.bind(chart);
    
    chart.x = function(_) {
      if (!arguments.length) return getX;
      getX = _;
      return chart;
    };
  
    chart.y = function(_) {
      if (!arguments.length) return getY;
      getY = _;
      return 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.xScale = function(_) {
      if (!arguments.length) return x;
      x = _;
      return chart;
    };
  
    chart.yScale = function(_) {
      if (!arguments.length) return y;
      y = _;
      return chart;
    };
  
    chart.xDomain = function(_) {
      if (!arguments.length) return xDomain;
      xDomain = _;
      return chart;
    };
  
    chart.yDomain = function(_) {
      if (!arguments.length) return yDomain;
      yDomain = _;
      return chart;
    };
  
    chart.xRange = function(_) {
      if (!arguments.length) return xRange;
      xRange = _;
      return chart;
    };
  
    chart.yRange = function(_) {
      if (!arguments.length) return yRange;
      yRange = _;
      return chart;
    };
  
    chart.forceY = function(_) {
      if (!arguments.length) return forceY;
      forceY = _;
      return chart;
    };
  
    chart.stacked = function(_) {
      if (!arguments.length) return stacked;
      stacked = _;
      return chart;
    };
  
    chart.stackOffset = function(_) {
      if (!arguments.length) return stackOffset;
      stackOffset = _;
      return chart;
    };
  
    chart.clipEdge = function(_) {
      if (!arguments.length) return clipEdge;
      clipEdge = _;
      return chart;
    };
  
    chart.color = function(_) {
      if (!arguments.length) return color;
      color = nv.utils.getColor(_);
      return chart;
    };
  
    chart.barColor = function(_) {
      if (!arguments.length) return barColor;
      barColor = nv.utils.getColor(_);
      return chart;
    };
  
    chart.disabled = function(_) {
      if (!arguments.length) return disabled;
      disabled = _;
      return chart;
    };
  
    chart.id = function(_) {
      if (!arguments.length) return id;
      id = _;
      return chart;
    };
  
    chart.hideable = function(_) {
      if (!arguments.length) return hideable;
      hideable = _;
      return chart;
    };
  
    chart.delay = function(_) {
      if (!arguments.length) return delay;
      delay = _;
      return chart;
    };
  
    chart.groupSpacing = function(_) {
      if (!arguments.length) return groupSpacing;
      groupSpacing = _;
      return chart;
    };
  
    //============================================================
  
  
    return chart;
  }
  