dc.colorChart = function(_chart) {

var _colors = d3.scale.category20c();

var _colorDomain = [0, _colors.range().length];

var _colorCalculator = function(value) {

var minValue = _colorDomain[0];

var maxValue = _colorDomain[1];

if (isNaN(value)) value = 0;

if(maxValue == null) return _colors(value);

var colorsLength = _chart.colors().range().length;

var denominator = (maxValue - minValue) / colorsLength;

var colorValue = Math.abs(Math.min(colorsLength - 1, Math.round((value - minValue) / denominator)));

return _chart.colors()(colorValue);

};

var _colorAccessor = function(d, i){return i;};

_chart.colors = function(_) {

if (!arguments.length) return _colors;

if (_ instanceof Array) {

_colors = d3.scale.ordinal().range(_);

var domain = [];

for(var i = 0; i < _.length; ++i){

domain.push(i);

}

_colors.domain(domain);

} else {

_colors = _;

}

_colorDomain = [0, _colors.range().length];

return _chart;

};

_chart.colorCalculator = function(_){

if(!arguments.length) return _colorCalculator;

_colorCalculator = _;

return _chart;

};

_chart.getColor = function(d, i){

return _colorCalculator(_colorAccessor(d, i));

};

_chart.colorAccessor = function(_){

if(!arguments.length) return _colorAccessor;

_colorAccessor = _;

return _chart;

};

_chart.colorDomain = function(_){

if(!arguments.length) return _colorDomain;

_colorDomain = _;

return _chart;

};

return _chart;

};