TrainSignManage/WebFrame/bower_components/jquery-sparkline/src/vcanvas-canvas.js

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    VCanvas_canvas = createClass(VCanvas_base, {
        init: function (width, height, target, interact) {
            VCanvas_canvas._super.init.call(this, width, height, target);
            this.canvas = document.createElement('canvas');
            if (target[0]) {
                target = target[0];
            }
            $.data(target, '_jqs_vcanvas', this);
            $(this.canvas).css({ display: 'inline-block', width: width, height: height, verticalAlign: 'top' });
            this._insert(this.canvas, target);
            this._calculatePixelDims(width, height, this.canvas);
            this.canvas.width = this.pixelWidth;
            this.canvas.height = this.pixelHeight;
            this.interact = interact;
            this.shapes = {};
            this.shapeseq = [];
            this.currentTargetShapeId = undefined;
            $(this.canvas).css({width: this.pixelWidth, height: this.pixelHeight});
        },

        _getContext: function (lineColor, fillColor, lineWidth) {
            var context = this.canvas.getContext('2d');
            if (lineColor !== undefined) {
                context.strokeStyle = lineColor;
            }
            context.lineWidth = lineWidth === undefined ? 1 : lineWidth;
            if (fillColor !== undefined) {
                context.fillStyle = fillColor;
            }
            return context;
        },

        reset: function () {
            var context = this._getContext();
            context.clearRect(0, 0, this.pixelWidth, this.pixelHeight);
            this.shapes = {};
            this.shapeseq = [];
            this.currentTargetShapeId = undefined;
        },

        _drawShape: function (shapeid, path, lineColor, fillColor, lineWidth) {
            var context = this._getContext(lineColor, fillColor, lineWidth),
                i, plen;
            context.beginPath();
            context.moveTo(path[0][0] + 0.5, path[0][1] + 0.5);
            for (i = 1, plen = path.length; i < plen; i++) {
                context.lineTo(path[i][0] + 0.5, path[i][1] + 0.5); // the 0.5 offset gives us crisp pixel-width lines
            }
            if (lineColor !== undefined) {
                context.stroke();
            }
            if (fillColor !== undefined) {
                context.fill();
            }
            if (this.targetX !== undefined && this.targetY !== undefined &&
                context.isPointInPath(this.targetX, this.targetY)) {
                this.currentTargetShapeId = shapeid;
            }
        },