How to use the color.range function in color

color: function() {
                        // i am cool with dc.js's color accessor
                        if(_.has(defn, 'color'))
                            chart.colorAccessor(key_value(accessor(defn.color)));
                        // however i don't understand why dc chooses to use a
                        // "color calculator" when a d3 scale seems like it ought
                        // to serve the purpose. so just plug a d3 scale into colors
                        // and override the calculator to use it
                        // also default to category10 which seems better for discrete colors

                        var scale = defn['color.scale'];
                        if(_.has(defn, 'color.domain'))
                            scale.domain(defn['color.domain']);
                        if(_.has(defn, 'color.range'))
                            scale.range(defn['color.range']);
                        chart.colors(scale);
                        chart.colorCalculator(function(x) { return chart.colors()(x); });
                    },
                    stackable: function() {

color: function() {
                // i am cool with dc.js's color accessor
                if(_.has(defn, 'color'))
                    chart.colorAccessor(key_value(accessor(defn.color)));
                // however i don't understand why dc chooses to use a
                // "color calculator" when a d3 scale seems like it ought
                // to serve the purpose. so just plug a d3 scale into colors
                // and override the calculator to use it
                // also default to category10 which seems better for discrete colors
                var scale = defn['color.scale'] || d3.scale.category10();
                if(_.has(defn, 'color.domain'))
                    scale.domain(defn['color.domain']);
                else if(mhas(defn, 'color', 'attrs', 'levels'))
                    scale.domain(defn.color.attrs.levels);
                if(_.has(defn, 'color.range'))
                    scale.range(defn['color.range']);
                chart.colors(scale);
                chart.colorCalculator(function(x) { return chart.colors()(x); });
            },
            stackable: function() {

create: function(definition, object, groupname, frame, defn, dims, groups, errors) {
            if(_.has(defn, 'color'))
                object.chart.colorAccessor(dcplot.key_value(dcplot.accessor(frame, defn.color)));

            var scale = defn['color.scale'];
            if(_.has(defn, 'color.domain'))
                scale.domain(defn['color.domain']);
            if(_.has(defn, 'color.range'))
                scale.range(defn['color.range']);
            object.chart.colors(scale);
        }
    },