JaBa/dashboard/public/bower_components/jquery-sparkline/src/chart-discrete.js

    /**
     * Discrete charts
     */
    $.fn.sparkline.discrete = discrete = createClass($.fn.sparkline._base, barHighlightMixin, {
        type: 'discrete',

        init: function (el, values, options, width, height) {
            discrete._super.init.call(this, el, values, options, width, height);

            this.regionShapes = {};
            this.values = values = $.map(values, Number);
            this.min = Math.min.apply(Math, values);
            this.max = Math.max.apply(Math, values);
            this.range = this.max - this.min;
            this.width = width = options.get('width') === 'auto' ? values.length * 2 : this.width;
            this.interval = Math.floor(width / values.length);
            this.itemWidth = width / values.length;
            if (options.get('chartRangeMin') !== undefined && (options.get('chartRangeClip') || options.get('chartRangeMin') < this.min)) {
                this.min = options.get('chartRangeMin');
            }
            if (options.get('chartRangeMax') !== undefined && (options.get('chartRangeClip') || options.get('chartRangeMax') > this.max)) {
                this.max = options.get('chartRangeMax');
            }
            this.initTarget();
            if (this.target) {
                this.lineHeight = options.get('lineHeight') === 'auto' ? Math.round(this.canvasHeight * 0.3) : options.get('lineHeight');
            }
        },

        getRegion: function (el, x, y) {
            return Math.floor(x / this.itemWidth);
        },

        getCurrentRegionFields: function () {
            var currentRegion = this.currentRegion;
            return {
                isNull: this.values[currentRegion] === undefined,
                value: this.values[currentRegion],
                offset: currentRegion
            };
        },

        renderRegion: function (valuenum, highlight) {
            var values = this.values,
                options = this.options,
                min = this.min,
                max = this.max,
                range = this.range,
                interval = this.interval,
                target = this.target,
                canvasHeight = this.canvasHeight,
                lineHeight = this.lineHeight,
                pheight = canvasHeight - lineHeight,
                ytop, val, color, x;

            val = clipval(values[valuenum], min, max);
            x = valuenum * interval;
            ytop = Math.round(pheight - pheight * ((val - min) / range));
            color = (options.get('thresholdColor') && val < options.get('thresholdValue')) ? options.get('thresholdColor') : options.get('lineColor');
            if (highlight) {
                color = this.calcHighlightColor(color, options);
            }
            return target.drawLine(x, ytop, x, ytop + lineHeight, color);
        }
    });