tv_xiaoyouxi/games/symdsb/frameworks/cocos2d-html5/CCDrawingPrimitivesCanvas.js

/****************************************************************************
 Copyright (c) 2008-2010 Ricardo Quesada
 Copyright (c) 2011-2012 cocos2d-x.org
 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
 copies of the Software, and to permit persons to whom the Software is
 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,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/
/**
 * @const
 * @type {number}
 */
cc.PI2 = Math.PI * 2;

/**
 * Canvas of DrawingPrimitive implement version use for canvasMode
 * @class
 * @extends cc.Class
 * @param {CanvasRenderingContext2D} renderContext
 */
cc.DrawingPrimitiveCanvas = cc.Class.extend(/** @lends cc.DrawingPrimitiveCanvas# */{
    _cacheArray:[],
    _renderContext:null,
    /**
     * Constructor of cc.DrawingPrimitiveCanvas
     * @param {CanvasRenderingContext2D} renderContext
     */
    ctor:function (renderContext) {
        this._renderContext = renderContext;
    },

    /**
     * draws a point given x and y coordinate measured in points
     * @override
     * @param {cc.Point} point
     * @param {Number} size
     */
    drawPoint:function (point, size) {
        if (!size) {
            size = 1;
        }
        var locScaleX = cc.view.getScaleX(), locScaleY = cc.view.getScaleY();
        var newPoint = cc.p(point.x  * locScaleX, point.y * locScaleY);
        this._renderContext.beginPath();
        this._renderContext.arc(newPoint.x, -newPoint.y, size * locScaleX, 0, Math.PI * 2, false);
        this._renderContext.closePath();
        this._renderContext.fill();
    },

    /**
     * draws an array of points.
     * @override
     * @param {Array} points point of array
     * @param {Number} numberOfPoints
     * @param {Number} size
     */
    drawPoints:function (points, numberOfPoints, size) {
        if (points == null) {
            return;
        }
        if (!size) {
            size = 1;
        }
        var locContext = this._renderContext,locScaleX = cc.view.getScaleX(), locScaleY = cc.view.getScaleY();

        locContext.beginPath();
        for (var i = 0, len = points.length; i < len; i++)
            locContext.arc(points[i].x * locScaleX, -points[i].y * locScaleY, size * locScaleX, 0, Math.PI * 2, false);
        locContext.closePath();
        locContext.fill();
    },

    /**
     * draws a line given the origin and destination point measured in points
     * @override
     * @param {cc.Point} origin
     * @param {cc.Point} destination
     */
    drawLine:function (origin, destination) {
        var locContext = this._renderContext, locScaleX = cc.view.getScaleX(), locScaleY = cc.view.getScaleY();
        locContext.beginPath();
        locContext.moveTo(origin.x * locScaleX, -origin.y * locScaleY);
        locContext.lineTo(destination.x * locScaleX, -destination.y * locScaleY);
        locContext.closePath();
        locContext.stroke();
    },

    /**
     * draws a rectangle given the origin and destination point measured in points.
     * @param {cc.Point} origin
     * @param {cc.Point} destination
     */
    drawRect:function (origin, destination) {
        this.drawLine(cc.p(origin.x, origin.y), cc.p(destination.x, origin.y));
        this.drawLine(cc.p(destination.x, origin.y), cc.p(destination.x, destination.y));
        this.drawLine(cc.p(destination.x, destination.y), cc.p(origin.x, destination.y));
        this.drawLine(cc.p(origin.x, destination.y), cc.p(origin.x, origin.y));
    },

    /**
     * draws a solid rectangle given the origin and destination point measured in points.
     * @param {cc.Point} origin
     * @param {cc.Point} destination
     * @param {cc.Color} color
     */
    drawSolidRect:function (origin, destination, color) {
        var vertices = [
            origin,
            cc.p(destination.x, origin.y),
            destination,
            cc.p(origin.x, destination.y)
        ];

        this.drawSolidPoly(vertices, 4, color);
    },

    /**
     * draws a polygon given a pointer to cc.Point coordinates and the number of vertices measured in points.
     * @override
     * @param {Array} vertices a pointer to cc.Point coordinates
     * @param {Number} numOfVertices the number of vertices measured in points
     * @param {Boolean} closePolygon The polygon can be closed or open
     * @param {Boolean} [fill=] The polygon can be closed or open and optionally filled with current color
     */
    drawPoly:function (vertices, numOfVertices, closePolygon, fill) {
        fill = fill || false;

        if (vertices == null)
            return;

        if (vertices.length < 3)
            throw new Error("Polygon's point must greater than 2");

        var firstPoint = vertices[0], locContext = this._renderContext;
        var locScaleX = cc.view.getScaleX(), locScaleY = cc.view.getScaleY();
        locContext.beginPath();
        locContext.moveTo(firstPoint.x * locScaleX, -firstPoint.y * locScaleY);
        for (var i = 1, len = vertices.length; i < len; i++)
            locContext.lineTo(vertices[i].x * locScaleX, -vertices[i].y * locScaleY);

        if (closePolygon)
            locContext.closePath();

        if (fill)
            locContext.fill();
        else
            locContext.stroke();
    },

    /**
     * draws a solid polygon given a pointer to CGPoint coordinates, the number of vertices measured in points, and a color.
     * @param {Array} polygons
     * @param {Number} numberOfPoints
     * @param {cc.Color} color
     */
    drawSolidPoly:function (polygons, numberOfPoints, color) {
        this.setDrawColor(color.r, color.g, color.b, color.a);
        this.drawPoly(polygons, numberOfPoints, true, true);
    },

    /**
     * draws a circle given the center, radius and number of segments.
     * @override
     * @param {cc.Point} center center of circle
     * @param {Number} radius
     * @param {Number} angle angle in radians
     * @param {Number} segments
     * @param {Boolean} [drawLineToCenter=]
     */
    drawCircle: function (center, radius, angle, segments, drawLineToCenter) {
        drawLineToCenter = drawLineToCenter || false;
        var locContext = this._renderContext;
        var locScaleX = cc.view.getScaleX(), locScaleY = cc.view.getScaleY();
        locContext.beginPath();
        var endAngle = angle - Math.PI * 2;
        locContext.arc(0 | (center.x * locScaleX), 0 | -(center.y * locScaleY), radius * locScaleX, -angle, -endAngle, false);
        if (drawLineToCenter) {
            locContext.lineTo(0 | (center.x * locScaleX), 0 | -(center.y * locScaleY));
        }
        locContext.stroke();
    },

    /**
     * draws a quad bezier path
     * @override
     * @param {cc.Point} origin
     * @param {cc.Point} control
     * @param {cc.Point} destination
     * @param {Number} segments
     */
    drawQuadBezier:function (origin, control, destination, segments) {
        //this is OpenGL Algorithm
        var vertices = this._cacheArray;
        vertices.length =0;

        var t = 0.0;
        for (var i = 0; i < segments; i++) {
            var x = Math.pow(1 - t, 2) * origin.x + 2.0 * (1 - t) * t * control.x + t * t * destination.x;
            var y = Math.pow(1 - t, 2) * origin.y + 2.0 * (1 - t) * t * control.y + t * t * destination.y;
            vertices.push(cc.p(x, y));
            t += 1.0 / segments;
        }
        vertices.push(cc.p(destination.x, destination.y));

        this.drawPoly(vertices, segments + 1, false, false);
    },

    /**
     * draws a cubic bezier path
     * @override
     * @param {cc.Point} origin
     * @param {cc.Point} control1
     * @param {cc.Point} control2
     * @param {cc.Point} destination
     * @param {Number} segments
     */
    drawCubicBezier:function (origin, control1, control2, destination, segments) {
        //this is OpenGL Algorithm
        var vertices = this._cacheArray;
        vertices.length =0;

        var t = 0;
        for (var i = 0; i < segments; i++) {
            var x = Math.pow(1 - t, 3) * origin.x + 3.0 * Math.pow(1 - t, 2) * t * control1.x + 3.0 * (1 - t) * t * t * control2.x + t * t * t * destination.x;
            var y = Math.pow(1 - t, 3) * origin.y + 3.0 * Math.pow(1 - t, 2) * t * control1.y + 3.0 * (1 - t) * t * t * control2.y + t * t * t * destination.y;
            vertices.push(cc.p(x , y ));
            t += 1.0 / segments;
        }
        vertices.push(cc.p(destination.x , destination.y));

        this.drawPoly(vertices, segments + 1, false, false);
    },

    /**
     * draw a CatmullRom curve
     * @override
     * @param {Array} points
     * @param {Number} segments
     */
    drawCatmullRom:function (points, segments) {
        this.drawCardinalSpline(points, 0.5, segments);
    },

    /**
     * draw a cardinal spline path
     * @override
     * @param {Array} config
     * @param {Number} tension
     * @param {Number} segments
     */
    drawCardinalSpline:function (config, tension, segments) {
        //lazy_init();
        cc._renderContext.strokeStyle = "rgba(255,255,255,1)";
        var points = this._cacheArray;
        points.length = 0;
        var p, lt;
        var deltaT = 1.0 / config.length;

        for (var i = 0; i < segments + 1; i++) {
            var dt = i / segments;

            // border
            if (dt == 1) {
                p = config.length - 1;
                lt = 1;
            } else {
                p = 0 | (dt / deltaT);
                lt = (dt - deltaT * p) / deltaT;
            }

            // Interpolate
            var newPos = cc.CardinalSplineAt(
                cc.getControlPointAt(config, p - 1),
                cc.getControlPointAt(config, p - 0),
                cc.getControlPointAt(config, p + 1),
                cc.getControlPointAt(config, p + 2),
                tension, lt);
            points.push(newPos);
        }
        this.drawPoly(points, segments + 1, false, false);
    },

    /**
     * draw an image
     * @override
     * @param {HTMLImageElement|HTMLCanvasElement} image
     * @param {cc.Point} sourcePoint
     * @param {cc.Size} sourceSize
     * @param {cc.Point} destPoint
     * @param {cc.Size} destSize
     */
    drawImage:function (image, sourcePoint, sourceSize, destPoint, destSize) {
        var len = arguments.length;
        switch (len) {
            case 2:
                var height = image.height;
                this._renderContext.drawImage(image, sourcePoint.x, -(sourcePoint.y + height));
                break;
            case 3:
                this._renderContext.drawImage(image, sourcePoint.x, -(sourcePoint.y + sourceSize.height), sourceSize.width, sourceSize.height);
                break;
            case 5:
                this._renderContext.drawImage(image, sourcePoint.x, sourcePoint.y, sourceSize.width, sourceSize.height, destPoint.x, -(destPoint.y + destSize.height),
                    destSize.width, destSize.height);
                break;
            default:
                throw new Error("Argument must be non-nil");
                break;
        }
    },

    /**
     * draw a star
     * @param {CanvasRenderingContext2D} ctx canvas context
     * @param {Number} radius
     * @param {cc.Color} color
     */
    drawStar:function (ctx, radius, color) {
        var context = ctx || this._renderContext;
        radius *= cc.view.getScaleX();
        var colorStr = "rgba(" + (0 | color.r) + "," + (0 | color.g) + "," + (0 | color.b);
        context.fillStyle = colorStr + ",1)";
        var subRadius = radius / 10;

        context.beginPath();
        context.moveTo(-radius, radius);
        context.lineTo(0, subRadius);
        context.lineTo(radius, radius);
        context.lineTo(subRadius, 0);
        context.lineTo(radius, -radius);
        context.lineTo(0, -subRadius);
        context.lineTo(-radius, -radius);
        context.lineTo(-subRadius, 0);
        context.lineTo(-radius, radius);
        context.closePath();
        context.fill();

        var g1 = context.createRadialGradient(0, 0, subRadius, 0, 0, radius);
        g1.addColorStop(0, colorStr + ", 1)");
        g1.addColorStop(0.3, colorStr + ", 0.8)");
        g1.addColorStop(1.0, colorStr + ", 0.0)");
        context.fillStyle = g1;
        context.beginPath();
        var startAngle_1 = 0;
        var endAngle_1 = cc.PI2;
        context.arc(0, 0, radius - subRadius, startAngle_1, endAngle_1, false);
        context.closePath();
        context.fill();
    },

    /**
     * draw a color ball
     * @param {CanvasRenderingContext2D} ctx canvas context
     * @param {Number} radius
     * @param {cc.Color} color
     */
    drawColorBall:function (ctx, radius, color) {
        var context = ctx || this._renderContext;
        radius *= cc.view.getScaleX();
        var colorStr = "rgba(" +(0|color.r) + "," + (0|color.g) + "," + (0|color.b);
        var subRadius = radius / 10;

        var g1 = context.createRadialGradient(0, 0, subRadius, 0, 0, radius);
        g1.addColorStop(0, colorStr + ", 1)");
        g1.addColorStop(0.3, colorStr + ", 0.8)");
        g1.addColorStop(0.6, colorStr + ", 0.4)");
        g1.addColorStop(1.0, colorStr + ", 0.0)");
        context.fillStyle = g1;
        context.beginPath();
        var startAngle_1 = 0;
        var endAngle_1 = cc.PI2;
        context.arc(0, 0, radius, startAngle_1, endAngle_1, false);
        context.closePath();
        context.fill();
    },

    /**
     * fill text
     * @param {String} strText
     * @param {Number} x
     * @param {Number} y
     */
    fillText:function (strText, x, y) {
        this._renderContext.fillText(strText, x, -y);
    },

    /**
     * set the drawing color with 4 unsigned bytes
     * @param {Number} r red value (0 to 255)
     * @param {Number} g green value (0 to 255)
     * @param {Number} b blue value (0 to 255)
     * @param {Number} a Alpha value (0 to 255)
     */
    setDrawColor:function (r, g, b, a) {
        this._renderContext.fillStyle = "rgba(" + r + "," + g + "," + b + "," + a / 255 + ")";
        this._renderContext.strokeStyle = "rgba(" + r + "," + g + "," + b + "," + a / 255 + ")";
    },

    /**
     * set the point size in points. Default 1.
     * @param {Number} pointSize
     */
    setPointSize:function (pointSize) {
    },

    /**
     * set the line width. Default 1.
     * @param {Number} width
     */
    setLineWidth:function (width) {
        this._renderContext.lineWidth = width * cc.view.getScaleX();
    }
});