    /**
     * Box plots
     */
    $.fn.sparkline.box = box = createClass($.fn.sparkline._base, {
        type: 'box',

        init: function (el, values, options, width, height) {
            box._super.init.call(this, el, values, options, width, height);
            this.values = $.map(values, Number);
            this.width = options.get('width') === 'auto' ? '4.0em' : width;
            this.initTarget();
            if (!this.values.length) {
                this.disabled = 1;
            }
        },

        /**
         * Simulate a single region
         */
        getRegion: function () {
            return 1;
        },

        getCurrentRegionFields: function () {
            var result = [
                { field: 'lq', value: this.quartiles[0] },
                { field: 'med', value: this.quartiles[1] },
                { field: 'uq', value: this.quartiles[2] }
            ];
            if (this.loutlier !== undefined) {
                result.push({ field: 'lo', value: this.loutlier});
            }
            if (this.routlier !== undefined) {
                result.push({ field: 'ro', value: this.routlier});
            }
            if (this.lwhisker !== undefined) {
                result.push({ field: 'lw', value: this.lwhisker});
            }
            if (this.rwhisker !== undefined) {
                result.push({ field: 'rw', value: this.rwhisker});
            }
            return result;
        },

        render: function () {
            var target = this.target,
                values = this.values,
                vlen = values.length,
                options = this.options,
                canvasWidth = this.canvasWidth,
                canvasHeight = this.canvasHeight,
                minValue = options.get('chartRangeMin') === undefined ? Math.min.apply(Math, values) : options.get('chartRangeMin'),
                maxValue = options.get('chartRangeMax') === undefined ? Math.max.apply(Math, values) : options.get('chartRangeMax'),
                canvasLeft = 0,
                lwhisker, loutlier, iqr, q1, q2, q3, rwhisker, routlier, i,
                size, unitSize;

            if (!box._super.render.call(this)) {
                return;
            }

            if (options.get('raw')) {
                if (options.get('showOutliers') && values.length > 5) {
                    loutlier = values[0];
                    lwhisker = values[1];
                    q1 = values[2];
                    q2 = values[3];
                    q3 = values[4];
                    rwhisker = values[5];
                    routlier = values[6];
                } else {
                    lwhisker = values[0];
                    q1 = values[1];
                    q2 = values[2];
                    q3 = values[3];
                    rwhisker = values[4];
                }
            } else {
                values.sort(function (a, b) { return a - b; });
                q1 = quartile(values, 1);
                q2 = quartile(values, 2);
                q3 = quartile(values, 3);
                iqr = q3 - q1;
                if (options.get('showOutliers')) {
                    lwhisker = rwhisker = undefined;
                    for (i = 0; i < vlen; i++) {
                        if (lwhisker === undefined && values[i] > q1 - (iqr * options.get('outlierIQR'))) {
                            lwhisker = values[i];
                        }
                        if (values[i] < q3 + (iqr * options.get('outlierIQR'))) {
                            rwhisker = values[i];
                        }
                    }
                    loutlier = values[0];
                    routlier = values[vlen - 1];
                } else {
                    lwhisker = values[0];
                    rwhisker = values[vlen - 1];
                }
            }
            this.quartiles = [q1, q2, q3];
            this.lwhisker = lwhisker;
            this.rwhisker = rwhisker;
            this.loutlier = loutlier;
            this.routlier = routlier;

            unitSize = canvasWidth / (maxValue - minValue + 1);
            if (options.get('showOutliers')) {
                canvasLeft = Math.ceil(options.get('spotRadius'));
                canvasWidth -= 2 * Math.ceil(options.get('spotRadius'));
                unitSize = canvasWidth / (maxValue - minValue + 1);
                if (loutlier < lwhisker) {
                    target.drawCircle((loutlier - minValue) * unitSize + canvasLeft,
                        canvasHeight / 2,
                        options.get('spotRadius'),
                        options.get('outlierLineColor'),
                        options.get('outlierFillColor')).append();
                }
                if (routlier > rwhisker) {
                    target.drawCircle((routlier - minValue) * unitSize + canvasLeft,
                        canvasHeight / 2,
                        options.get('spotRadius'),
                        options.get('outlierLineColor'),
                        options.get('outlierFillColor')).append();
                }
            }

            // box
            target.drawRect(
                Math.round((q1 - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight * 0.1),
                Math.round((q3 - q1) * unitSize),
                Math.round(canvasHeight * 0.8),
                options.get('boxLineColor'),
                options.get('boxFillColor')).append();
            // left whisker
            target.drawLine(
                Math.round((lwhisker - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight / 2),
                Math.round((q1 - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight / 2),
                options.get('lineColor')).append();
            target.drawLine(
                Math.round((lwhisker - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight / 4),
                Math.round((lwhisker - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight - canvasHeight / 4),
                options.get('whiskerColor')).append();
            // right whisker
            target.drawLine(Math.round((rwhisker - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight / 2),
                Math.round((q3 - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight / 2),
                options.get('lineColor')).append();
            target.drawLine(
                Math.round((rwhisker - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight / 4),
                Math.round((rwhisker - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight - canvasHeight / 4),
                options.get('whiskerColor')).append();
            // median line
            target.drawLine(
                Math.round((q2 - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight * 0.1),
                Math.round((q2 - minValue) * unitSize + canvasLeft),
                Math.round(canvasHeight * 0.9),
                options.get('medianColor')).append();
            if (options.get('target')) {
                size = Math.ceil(options.get('spotRadius'));
                target.drawLine(
                    Math.round((options.get('target') - minValue) * unitSize + canvasLeft),
                    Math.round((canvasHeight / 2) - size),
                    Math.round((options.get('target') - minValue) * unitSize + canvasLeft),
                    Math.round((canvasHeight / 2) + size),
                    options.get('targetColor')).append();
                target.drawLine(
                    Math.round((options.get('target') - minValue) * unitSize + canvasLeft - size),
                    Math.round(canvasHeight / 2),
                    Math.round((options.get('target') - minValue) * unitSize + canvasLeft + size),
                    Math.round(canvasHeight / 2),
                    options.get('targetColor')).append();
            }
            target.render();
        }
    });
