fbird/frameworks/cocos2d-html5/cocos2d/physics/CCPhysicsDebugNode.js

/****************************************************************************
 Copyright (c) 2008-2010 Ricardo Quesada
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2014 Chukong Technologies Inc.
 Copyright (c) 2012 Scott Lembcke and Howling Moon Software

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/*
 IMPORTANT - READ ME!

 This file sets pokes around in the private API a lot to provide efficient
 debug rendering given nothing more than reference to a Chipmunk space.
 It is not recommended to write rendering code like this in your own games
 as the private API may change with little or no warning.
 */

/**
 *  Converts an array of numbers into an array of vectors(x,y)
 *  @function
 *  @param {Array} verts
 *  @return {Array}
 */
cc.__convertVerts = function (verts) {
    var ret = [];
    for (var i = 0; i < verts.length / 2; i++) {
        ret[i] = {x:verts[i * 2], y:verts[i * 2 + 1]};
    }
    return ret;
};

/**
 * color for body
 * @function
 * @param {cp.Body} body
 * @return {cc.color}
 */
cc.ColorForBody = function (body) {
    if (body.isRogue() || body.isSleeping()) {
        return cc.color(128, 128, 128, 128);
    } else if (body.nodeIdleTime > body.space.sleepTimeThreshold) {
        return cc.color(84, 84, 84, 128);
    } else {
        return cc.color(255, 0, 0, 128);
    }
};

/**
 * draw shape
 * @param {cp.Shape} shape
 * @param renderer
 */
cc.DrawShape = function (shape, renderer) {
    var body = shape.body;
    var color = cc.ColorForBody(body);
    switch (shape.collisionCode) {
        case cp.CircleShape.prototype.collisionCode:
            this.drawDot(shape.tc, Math.max(shape.r, 1.0), color);
            this.drawSegment(shape.tc, cp.v.add(shape.tc, cp.v.mult(body.rot, shape.r)), 1.0, color);
            break;
        case cp.SegmentShape.prototype.collisionCode:
            this.drawSegment(shape.ta, shape.tb, Math.max(shape.r, 2.0), color);
            break;
        case cp.PolyShape.prototype.collisionCode:
            var line = cc.color(color.r, color.g, color.b, cc.lerp(color.a, 255, 0.5));
            this.drawPoly(cc.__convertVerts(shape.tVerts), color, 1.0, line);
            break;
        default:
            cc.log("cc.DrawShape(): Bad assertion in DrawShape()");
            break;
    }
};

/**
 * draw constraint
 * @param {cp.Constraint} constraint
 * @param renderer
 */
cc.DrawConstraint = function (constraint, renderer) {
    var body_a = constraint.a;
    var body_b = constraint.b;
    var a, b;

    if (constraint instanceof cp.PinJoint) {
        a = body_a.local2World(constraint.anchr1);
        b = body_b.local2World(constraint.anchr2);
        this.drawDot(a, 3.0, cc.CONSTRAINT_COLOR);
        this.drawDot(b, 3.0, cc.CONSTRAINT_COLOR);
        this.drawSegment(a, b, 1.0, cc.CONSTRAINT_COLOR);
    } else if (constraint instanceof cp.SlideJoint) {
        a = body_a.local2World(constraint.anchr1);
        b = body_b.local2World(constraint.anchr2);

        this.drawDot(a, 3.0, cc.CONSTRAINT_COLOR);
        this.drawDot(b, 3.0, cc.CONSTRAINT_COLOR);
        this.drawSegment(a, b, 1.0, cc.CONSTRAINT_COLOR);
    } else if (constraint instanceof cp.PivotJoint) {
        a = body_a.local2World(constraint.anchr1);
        b = body_b.local2World(constraint.anchr2);
        this.drawDot(a, 3.0, cc.CONSTRAINT_COLOR);
        this.drawDot(b, 3.0, cc.CONSTRAINT_COLOR);
    } else if (constraint instanceof cp.GrooveJoint) {
        a = body_a.local2World(constraint.grv_a);
        b = body_a.local2World(constraint.grv_b);
        var c = body_b.local2World(constraint.anchr2);

        this.drawDot(c, 3.0, cc.CONSTRAINT_COLOR);
        this.drawSegment(a, b, 1.0, cc.CONSTRAINT_COLOR);
    } else if (constraint instanceof cp.DampedSpring) {
        // TODO
    } else {
        //printf("Cannot draw constraint\n");
    }
};

/**
 * @constant
 * @type {cc.color}
 */
cc.CONSTRAINT_COLOR = cc.color(0, 255, 0, 128);


/**
 * <p>A Node that draws the components of a physics engine.<br/>
 * Supported physics engines:<br/>
 * - Chipmunk<br/>
 * - Objective-Chipmunk</p>
 *
 * @class
 * @extends cc.DrawNode
 *
 * @property {cp.Space} space     Physic world space
 */
cc.PhysicsDebugNode = cc.DrawNode.extend({
    _space:null,
    _className:"PhysicsDebugNode",

    /**
     * constructor of cc.PhysicsDebugNode
     * @param {cp.Space} space
     */
    ctor: function (space) {
        cc.DrawNode.prototype.ctor.call(this);
        this._space = space;
    },

    /**
     * get space
     * @returns {cp.Space}
     */
    getSpace:function () {
        return this._space;
    },

    /**
     * set space
     * @param {cp.Space} space
     */
    setSpace:function (space) {
        this._space = space;
    },

    /**
     * draw
     * @param {object} context
     */
    draw:function (context) {
        if (!this._space)
            return;

        this._space.eachShape(cc.DrawShape.bind(this));
        this._space.eachConstraint(cc.DrawConstraint.bind(this));
        cc.DrawNode.prototype.draw.call(this);
        this.clear();
    },

    _createRenderCmd: function(){
        if(cc._renderType === cc.game.RENDER_TYPE_CANVAS)
            return new cc.PhysicsDebugNode.CanvasRenderCmd(this);
        else
            return new cc.PhysicsDebugNode.WebGLRenderCmd(this);
    }
});

/**
 * Create a debug node for a regular Chipmunk space.
 * @deprecated since v3.0, please use new cc.PhysicsDebugNode(space)
 * @param {cp.Space} space
 * @return {cc.PhysicsDebugNode}
 */
cc.PhysicsDebugNode.create = function (space) {
    return new cc.PhysicsDebugNode(space);
};