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

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 Copyright (c) 2008-2010 Ricardo Quesada
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 Copyright (c) 2013-2014 Chukong Technologies 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,

    /**
     * Constructor function, override it to extend the construction behavior, remember to call "this._super()" in the extended "ctor" function.
     */
    ctor:function(){
        var _t = this;
        cc.ActionInterval.prototype.ctor.call(_t);

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

    /**
     * called before the action start. It will also set the target.
     *
     * @param {cc.Node} target
     */
    startWithTarget:function (target) {
        var _t = this;
        cc.ActionInterval.prototype.startWithTarget.call(_t, target);

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

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

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

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

    /**
     * returns a reversed action. <br />
     * For example: <br />
     * - The action will be x coordinates of 0 move to 100. <br />
     * - The reversed action will be x of 100 move to 0.
     * - Will be rewritten
     *
     */
    reverse:function () {
        return new cc.ReverseTime(this);
    }
});

/**
 * Orbits the camera around the center of the screen using spherical coordinates.
 *
 * @param {Number} t time
 * @param {Number} radius
 * @param {Number} deltaRadius
 * @param {Number} angleZ
 * @param {Number} deltaAngleZ
 * @param {Number} angleX
 * @param {Number} deltaAngleX
 *
 * @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,

	/**
     * Constructor function, override it to extend the construction behavior, remember to call "this._super()" in the extended "ctor" function. <br />
	 * 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
	 */
    ctor:function(t, radius, deltaRadius, angleZ, deltaAngleZ, angleX, deltaAngleX){
        cc.ActionCamera.prototype.ctor.call(this);

		deltaAngleX !== undefined && this.initWithDuration(t, radius, deltaRadius, angleZ, deltaAngleZ, angleX, deltaAngleX);
    },

    /**
     * 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)) {
            var _t = this;
            _t._radius = radius;
            _t._deltaRadius = deltaRadius;
            _t._angleZ = angleZ;
            _t._deltaAngleZ = deltaAngleZ;
            _t._angleX = angleX;
            _t._deltaAngleX = deltaAngleX;

            _t._radDeltaZ = cc.degreesToRadians(deltaAngleZ);
            _t._radDeltaX = cc.degreesToRadians(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, y = eyeXYZ.y - centerXYZ.y, 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};
    },

    /**
     * called before the action start. It will also set the target.
     *
     * @param {cc.Node} target
     */
    startWithTarget:function (target) {
        var _t = this;
        cc.ActionInterval.prototype.startWithTarget.call(_t, target);
        var retValue = _t.sphericalRadius();
        if (isNaN(_t._radius))
            _t._radius = retValue.newRadius;

        if (isNaN(_t._angleZ))
            _t._angleZ = cc.radiansToDegrees(retValue.zenith);

        if (isNaN(_t._angleX))
            _t._angleX = cc.radiansToDegrees(retValue.azimuth);

        _t._radZ = cc.degreesToRadians(_t._angleZ);
        _t._radX = cc.degreesToRadians(_t._angleX);
    },

    /**
     * to copy object with deep copy.
     * returns a new clone of the action
     *
     * @returns {cc.ActionCamera}
     */
    clone:function(){
        var a = new cc.OrbitCamera(), _t = this;
        a.initWithDuration(_t._duration, _t._radius, _t._deltaRadius, _t._angleZ, _t._deltaAngleZ, _t._angleX, _t._deltaAngleX);
        return a;
    },

    /**
     * Called once per frame. Time is the number of seconds of a frame interval.
     *
     * @param {Number}  dt
     */
    update:function (dt) {
        dt = this._computeEaseTime(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
 * @function
 * @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 = function (t, radius, deltaRadius, angleZ, deltaAngleZ, angleX, deltaAngleX) {
    return new cc.OrbitCamera(t, radius, deltaRadius, angleZ, deltaAngleZ, angleX, deltaAngleX);
};

/**
 * Please use cc.orbitCamera instead
 * 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}
 * @static
 * @deprecated since v3.0 please use cc.orbitCamera() instead.
 */
cc.OrbitCamera.create = cc.orbitCamera;