fbird/frameworks/cocos2d-html5/cocos2d/shape-nodes/CCDrawNodeCanvasRenderCmd.js

/****************************************************************************
 Copyright (c) 2013-2014 Chukong Technologies Inc.

 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 THE SOFTWARE.
 ****************************************************************************/

(function () {

    cc.DrawNode.CanvasRenderCmd = function (renderableObject) {
        this._rootCtor(renderableObject);
        this._needDraw = true;
        this._buffer = null;
        this._drawColor = null;
        this._blendFunc = null;
    };


    cc.DrawNode.CanvasRenderCmd.prototype = Object.create(cc.Node.CanvasRenderCmd.prototype);
    cc.DrawNode.CanvasRenderCmd.prototype.constructor = cc.DrawNode.CanvasRenderCmd;

    cc.DrawNode.CanvasRenderCmd.prototype.getLocalBB = function () {
        var node = this._node;
        return node._localBB;
    };

    cc.extend(cc.DrawNode.CanvasRenderCmd.prototype, {
        rendering: function (ctx, scaleX, scaleY) {
            var wrapper = ctx || cc._renderContext, context = wrapper.getContext(), node = this._node;
            var alpha = this._displayedOpacity / 255;
            if (alpha === 0)
                return;

            wrapper.setTransform(this._worldTransform, scaleX, scaleY);

            //context.save();
            wrapper.setGlobalAlpha(alpha);
            if ((this._blendFunc && (this._blendFunc.src === cc.SRC_ALPHA) && (this._blendFunc.dst === cc.ONE)))
                wrapper.setCompositeOperation('lighter');               //todo: need refactor
            var locBuffer = this._buffer;
            for (var i = 0, len = locBuffer.length; i < len; i++) {
                var element = locBuffer[i];
                switch (element.type) {
                    case cc.DrawNode.TYPE_DOT:
                        this._drawDot(wrapper, element, scaleX, scaleY);
                        break;
                    case cc.DrawNode.TYPE_SEGMENT:
                        this._drawSegment(wrapper, element, scaleX, scaleY);
                        break;
                    case cc.DrawNode.TYPE_POLY:
                        this._drawPoly(wrapper, element, scaleX, scaleY);
                        break;
                }
            }
            //context.restore();            //todo It can be reserve
        },

        _drawDot: function (wrapper, element) {
            var locColor = element.fillColor, locPos = element.verts[0], locRadius = element.lineWidth;

            var ctx = wrapper.getContext();
            wrapper.setFillStyle("rgba(" + (0 | locColor.r) + "," + (0 | locColor.g) + "," + (0 | locColor.b) + "," + locColor.a / 255 + ")");

            ctx.beginPath();
            ctx.arc(locPos.x, -locPos.y, locRadius, 0, Math.PI * 2, false);
            ctx.closePath();
            ctx.fill();
        },

        _drawSegment: function (wrapper, element, scaleX) {
            var locColor = element.lineColor;
            var locFrom = element.verts[0], locTo = element.verts[1];
            var locLineWidth = element.lineWidth, locLineCap = element.lineCap;

            var ctx = wrapper.getContext();
            wrapper.setStrokeStyle("rgba(" + (0 | locColor.r) + "," + (0 | locColor.g) + "," + (0 | locColor.b) + "," + locColor.a / 255 + ")");

            ctx.lineWidth = locLineWidth * scaleX;
            ctx.beginPath();
            ctx.lineCap = locLineCap;
            ctx.moveTo(locFrom.x, -locFrom.y);
            ctx.lineTo(locTo.x, -locTo.y);
            ctx.stroke();
        },

        _drawPoly: function (wrapper, element, scaleX) {
            var locVertices = element.verts, locLineCap = element.lineCap;
            if (locVertices == null)
                return;

            var locFillColor = element.fillColor, locLineWidth = element.lineWidth;
            var locLineColor = element.lineColor, locIsClosePolygon = element.isClosePolygon;
            var locIsFill = element.isFill, locIsStroke = element.isStroke;

            var ctx = wrapper.getContext();
            var firstPoint = locVertices[0];
            ctx.lineCap = locLineCap;
            if (locFillColor)
                wrapper.setFillStyle("rgba(" + (0 | locFillColor.r) + "," + (0 | locFillColor.g) + ","
                    + (0 | locFillColor.b) + "," + locFillColor.a / 255 + ")");
            if (locLineWidth)
                ctx.lineWidth = locLineWidth * scaleX;
            if (locLineColor)
                wrapper.setStrokeStyle("rgba(" + (0 | locLineColor.r) + "," + (0 | locLineColor.g) + ","
                    + (0 | locLineColor.b) + "," + locLineColor.a / 255 + ")");

            ctx.beginPath();
            ctx.moveTo(firstPoint.x, -firstPoint.y);
            for (var i = 1, len = locVertices.length; i < len; i++)
                ctx.lineTo(locVertices[i].x, -locVertices[i].y);

            if (locIsClosePolygon)
                ctx.closePath();
            if (locIsFill)
                ctx.fill();
            if (locIsStroke)
                ctx.stroke();
        }
    });
    
})();