tv_xiaoyouxi/games/dwy/cocos2d-html5-v2.2.3/cocos2d/CCActionCamera.js

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 Copyright (c) 2010-2012 cocos2d-x.org
 Copyright (c) 2008-2010 Ricardo Quesada
 Copyright (c) 2011      Zynga Inc.

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/**
 * Base class for cc.Camera actions
 * @class
 * @extends cc.ActionInterval
 */
cc.ActionCamera = cc.ActionInterval.extend(/** @lends cc.ActionCamera# */{
    _centerXOrig:0,
    _centerYOrig:0,
    _centerZOrig:0,
    _eyeXOrig:0,
    _eyeYOrig:0,
    _eyeZOrig:0,
    _upXOrig:0,
    _upYOrig:0,
    _upZOrig:0,

    ctor:function(){
        cc.ActionInterval.prototype.ctor.call(this);

        this._centerXOrig=0;
        this._centerYOrig=0;
        this._centerZOrig=0;
        this._eyeXOrig=0;
        this._eyeYOrig=0;
        this._eyeZOrig=0;
        this._upXOrig=0;
        this._upYOrig=0;
        this._upZOrig=0;
    },


    startWithTarget:function (target) {
        cc.ActionInterval.prototype.startWithTarget.call(this, target);

        var camera = target.getCamera();
        var centerXYZ = camera.getCenter();
        this._centerXOrig = centerXYZ.x;
        this._centerYOrig = centerXYZ.y;
        this._centerZOrig = centerXYZ.z;

        var eyeXYZ = camera.getEye();
        this._eyeXOrig = eyeXYZ.x;
        this._eyeYOrig = eyeXYZ.y;
        this._eyeZOrig = eyeXYZ.z;

        var upXYZ = camera.getUp();
        this._upXOrig = upXYZ.x;
        this._upYOrig = upXYZ.y;
        this._upZOrig = upXYZ.z;
    },

    /**
     * returns a new clone of the action
     * @returns {cc.ActionCamera}
     */
    clone:function(){
       return new cc.ActionCamera();
    },

    reverse:function () {
        return cc.ReverseTime.create(this);
    }
});

/**
 * Orbits the camera around the center of the screen using spherical coordinates
 * @class
 * @extends cc.ActionCamera
 */
cc.OrbitCamera = cc.ActionCamera.extend(/** @lends cc.OrbitCamera# */{
    _radius:0.0,
    _deltaRadius:0.0,
    _angleZ:0.0,
    _deltaAngleZ:0.0,
    _angleX:0.0,
    _deltaAngleX:0.0,
    _radZ:0.0,
    _radDeltaZ:0.0,
    _radX:0.0,
    _radDeltaX:0.0,

    ctor:function(){
        cc.ActionCamera.prototype.ctor.call(this);

        this._radius=0.0;
        this._deltaRadius=0.0;
        this._angleZ=0.0;
        this._deltaAngleZ=0.0;
        this._angleX=0.0;
        this._deltaAngleX=0.0;
        this._radZ=0.0;
        this._radDeltaZ=0.0;
        this._radX=0.0;
        this._radDeltaX=0.0;
    },

    /**
     * initializes a cc.OrbitCamera action with radius, delta-radius,  z, deltaZ, x, deltaX
     * @param {Number} t time
     * @param {Number} radius
     * @param {Number} deltaRadius
     * @param {Number} angleZ
     * @param {Number} deltaAngleZ
     * @param {Number} angleX
     * @param {Number} deltaAngleX
     * @return {Boolean}
     */
    initWithDuration:function (t, radius, deltaRadius, angleZ, deltaAngleZ, angleX, deltaAngleX) {
        if (cc.ActionInterval.prototype.initWithDuration.call(this, t)) {
            this._radius = radius;
            this._deltaRadius = deltaRadius;
            this._angleZ = angleZ;
            this._deltaAngleZ = deltaAngleZ;
            this._angleX = angleX;
            this._deltaAngleX = deltaAngleX;

            this._radDeltaZ = cc.DEGREES_TO_RADIANS(deltaAngleZ);
            this._radDeltaX = cc.DEGREES_TO_RADIANS(deltaAngleX);
            return true;
        }
        return false;
    },

    /**
     * positions the camera according to spherical coordinates
     * @return {Object}
     */
    sphericalRadius:function () {
        var newRadius, zenith, azimuth;
        var camera = this._target.getCamera();
        var eyeXYZ = camera.getEye();
        var centerXYZ = camera.getCenter();

        var x = eyeXYZ.x - centerXYZ.x;
        var y = eyeXYZ.y - centerXYZ.y;
        var z = eyeXYZ.z - centerXYZ.z;

        var r = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2));
        var s = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
        if (s === 0.0)
            s = cc.FLT_EPSILON;
        if (r === 0.0)
            r = cc.FLT_EPSILON;

        zenith = Math.acos(z / r);
        if (x < 0)
            azimuth = Math.PI - Math.asin(y / s);
        else
            azimuth = Math.asin(y / s);
        newRadius = r / cc.Camera.getZEye();
        return {newRadius:newRadius, zenith:zenith, azimuth:azimuth};
    },

    startWithTarget:function (target) {
        cc.ActionInterval.prototype.startWithTarget.call(this, target);
        var retValue = this.sphericalRadius();
        if (isNaN(this._radius))
            this._radius = retValue.newRadius;

        if (isNaN(this._angleZ))
            this._angleZ = cc.RADIANS_TO_DEGREES(retValue.zenith);

        if (isNaN(this._angleX))
            this._angleX = cc.RADIANS_TO_DEGREES(retValue.azimuth);

        this._radZ = cc.DEGREES_TO_RADIANS(this._angleZ);
        this._radX = cc.DEGREES_TO_RADIANS(this._angleX);
    },

    clone:function(){
        var a = new cc.OrbitCamera();
        a.initWithDuration(this._duration, this._radius, this._deltaRadius, this._angleZ, this._deltaAngleZ, this._angleX, this._deltaAngleX);
        return a;
    },

    update:function (dt) {
        var r = (this._radius + this._deltaRadius * dt) * cc.Camera.getZEye();
        var za = this._radZ + this._radDeltaZ * dt;
        var xa = this._radX + this._radDeltaX * dt;

        var i = Math.sin(za) * Math.cos(xa) * r + this._centerXOrig;
        var j = Math.sin(za) * Math.sin(xa) * r + this._centerYOrig;
        var k = Math.cos(za) * r + this._centerZOrig;

        this._target.getCamera().setEye(i, j, k);
    }
});

/**
 * creates a cc.OrbitCamera action with radius, delta-radius,  z, deltaZ, x, deltaX
 * @param {Number} t time
 * @param {Number} radius
 * @param {Number} deltaRadius
 * @param {Number} angleZ
 * @param {Number} deltaAngleZ
 * @param {Number} angleX
 * @param {Number} deltaAngleX
 * @return {cc.OrbitCamera}
 */
cc.OrbitCamera.create = function (t, radius, deltaRadius, angleZ, deltaAngleZ, angleX, deltaAngleX) {
    var ret = new cc.OrbitCamera();
    if (ret.initWithDuration(t, radius, deltaRadius, angleZ, deltaAngleZ, angleX, deltaAngleX))
        return ret;
    return null;
};