# Source: src/core/Camera.js

    /**
    * @author       Richard Davey <rich@photonstorm.com>
    * @copyright    2016 Photon Storm Ltd.
    * @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
    */

    /**
    * A Camera is your view into the game world. It has a position and size and renders only those objects within its field of view.
    * The game automatically creates a single Stage sized camera on boot. Move the camera around the world with Phaser.Camera.x/y
    *
    * @class Phaser.Camera
    * @constructor
    * @param {Phaser.Game} game - Game reference to the currently running game.
    * @param {number} id - Not being used at the moment, will be when Phaser supports multiple camera
    * @param {number} x - Position of the camera on the X axis
    * @param {number} y - Position of the camera on the Y axis
    * @param {number} width - The width of the view rectangle
    * @param {number} height - The height of the view rectangle
    */
    Phaser.Camera = function (game, id, x, y, width, height) {

        /**
        * @property {Phaser.Game} game - A reference to the currently running Game.
        */
        this.game = game;

        /**
        * @property {Phaser.World} world - A reference to the game world.
        */
        this.world = game.world;

        /**
        * @property {number} id - Reserved for future multiple camera set-ups.
        * @default
        */
        this.id = 0;

        /**
        * Camera view.
        * The view into the world we wish to render (by default the game dimensions).
        * The x/y values are in world coordinates, not screen coordinates, the width/height is how many pixels to render.
        * Sprites outside of this view are not rendered if Sprite.autoCull is set to `true`. Otherwise they are always rendered.
        * @property {Phaser.Rectangle} view
        */
        this.view = new Phaser.Rectangle(x, y, width, height);

        /**
        * The Camera is bound to this Rectangle and cannot move outside of it. By default it is enabled and set to the size of the World.
        * The Rectangle can be located anywhere in the world and updated as often as you like. If you don't wish the Camera to be bound
        * at all then set this to null. The values can be anything and are in World coordinates, with 0,0 being the top-left of the world.
        *
        * @property {Phaser.Rectangle} bounds - The Rectangle in which the Camera is bounded. Set to null to allow for movement anywhere.
        */
        this.bounds = new Phaser.Rectangle(x, y, width, height);

        /**
        * @property {Phaser.Rectangle} deadzone - Moving inside this Rectangle will not cause the camera to move.
        */
        this.deadzone = null;

        /**
        * @property {boolean} visible - Whether this camera is visible or not.
        * @default
        */
        this.visible = true;

        /**
        * @property {boolean} roundPx - If a Camera has roundPx set to `true` it will call `view.floor` as part of its update loop, keeping its boundary to integer values. Set this to `false` to disable this from happening.
        * @default
        */
        this.roundPx = true;

        /**
        * @property {boolean} atLimit - Whether this camera is flush with the World Bounds or not.
        */
        this.atLimit = { x: false, y: false };

        /**
        * @property {Phaser.Sprite} target - If the camera is tracking a Sprite, this is a reference to it, otherwise null.
        * @default
        */
        this.target = null;

        /**
        * @property {PIXI.DisplayObject} displayObject - The display object to which all game objects are added. Set by World.boot.
        */
        this.displayObject = null;

        /**
        * @property {Phaser.Point} scale - The scale of the display object to which all game objects are added. Set by World.boot.
        */
        this.scale = null;

        /**
        * @property {number} totalInView - The total number of Sprites with `autoCull` set to `true` that are visible by this Camera.
        * @readonly
        */
        this.totalInView = 0;

        /**
        * The linear interpolation value to use when following a target.
        * The default values of 1 means the camera will instantly snap to the target coordinates.
        * A lower value, such as 0.1 means the camera will more slowly track the target, giving
        * a smooth transition. You can set the horizontal and vertical values independently, and also
        * adjust this value in real-time during your game.
        * @property {Phaser.Point} lerp
        * @default
        */
        this.lerp = new Phaser.Point(1, 1);

        /**
        * @property {Phaser.Signal} onShakeComplete - This signal is dispatched when the camera shake effect completes.
        */
        this.onShakeComplete = new Phaser.Signal();

        /**
        * @property {Phaser.Signal} onFlashComplete - This signal is dispatched when the camera flash effect completes.
        */
        this.onFlashComplete = new Phaser.Signal();

        /**
        * This signal is dispatched when the camera fade effect completes.
        * When the fade effect completes you will be left with the screen black (or whatever
        * color you faded to). In order to reset this call `Camera.resetFX`. This is called
        * automatically when you change State.
        * @property {Phaser.Signal} onFadeComplete
        */
        this.onFadeComplete = new Phaser.Signal();

        /**
        * The Graphics object used to handle camera fx such as fade and flash.
        * @property {Phaser.Graphics} fx
        * @protected
        */
        this.fx = null;

        /**
        * @property {Phaser.Point} _targetPosition - Internal point used to calculate target position.
        * @private
        */
        this._targetPosition = new Phaser.Point();

        /**
        * @property {number} edge - Edge property.
        * @private
        * @default
        */
        this._edge = 0;

        /**
        * @property {Phaser.Point} position - Current position of the camera in world.
        * @private
        * @default
        */
        this._position = new Phaser.Point();

        /**
        * @property {Object} _shake - The shake effect container.
        * @private
        */
        this._shake = {
            intensity: 0,
            duration: 0,
            horizontal: false,
            vertical: false,
            shakeBounds: true,
            x: 0,
            y: 0
        };

        /**
        * @property {number} _fxDuration - FX duration timer.
        * @private
        */
        this._fxDuration = 0;

        /**
        * @property {number} _fxType - The FX type running.
        * @private
        */
        this._fxType = 0;

    };

    /**
    * @constant
    * @type {number}
    */
    Phaser.Camera.FOLLOW_LOCKON = 0;

    /**
    * @constant
    * @type {number}
    */
    Phaser.Camera.FOLLOW_PLATFORMER = 1;

    /**
    * @constant
    * @type {number}
    */
    Phaser.Camera.FOLLOW_TOPDOWN = 2;

    /**
    * @constant
    * @type {number}
    */
    Phaser.Camera.FOLLOW_TOPDOWN_TIGHT = 3;

    /**
    * @constant
    * @type {number}
    */
    Phaser.Camera.SHAKE_BOTH = 4;

    /**
    * @constant
    * @type {number}
    */
    Phaser.Camera.SHAKE_HORIZONTAL = 5;

    /**
    * @constant
    * @type {number}
    */
    Phaser.Camera.SHAKE_VERTICAL = 6;

    /**
    * @constant
    * @type {boolean}
    */
    Phaser.Camera.ENABLE_FX = true;

    Phaser.Camera.prototype = {

        /**
        * Called automatically by Phaser.World.
        *
        * @method Phaser.Camera#boot
        * @private
        */
        boot: function () {

            this.displayObject = this.game.world;

            this.scale = this.game.world.scale;

            this.game.camera = this;

            if (Phaser.Graphics && Phaser.Camera.ENABLE_FX)
            {
                this.fx = new Phaser.Graphics(this.game);

                this.game.stage.addChild(this.fx);
            }

        },

        /**
        * Camera preUpdate. Sets the total view counter to zero.
        *
        * @method Phaser.Camera#preUpdate
        */
        preUpdate: function () {

            this.totalInView = 0;

        },

        /**
        * Tell the camera which sprite to follow.
        *
        * You can set the follow type and a linear interpolation value.
        * Use low lerp values (such as 0.1) to automatically smooth the camera motion.
        *
        * If you find you're getting a slight "jitter" effect when following a Sprite it's probably to do with sub-pixel rendering of the Sprite position.
        * This can be disabled by setting `game.renderer.renderSession.roundPixels = true` to force full pixel rendering.
        *
        * @method Phaser.Camera#follow
        * @param {Phaser.Sprite|Phaser.Image|Phaser.Text} target - The object you want the camera to track. Set to null to not follow anything.
        * @param {number} [style] - Leverage one of the existing "deadzone" presets. If you use a custom deadzone, ignore this parameter and manually specify the deadzone after calling follow().
        * @param {float} [lerpX=1] - A value between 0 and 1. This value specifies the amount of linear interpolation to use when horizontally tracking the target. The closer the value to 1, the faster the camera will track.
        * @param {float} [lerpY=1] - A value between 0 and 1. This value specifies the amount of linear interpolation to use when vertically tracking the target. The closer the value to 1, the faster the camera will track.
        */
        follow: function (target, style, lerpX, lerpY) {

            if (style === undefined) { style = Phaser.Camera.FOLLOW_LOCKON; }
            if (lerpX === undefined) { lerpX = 1; }
            if (lerpY === undefined) { lerpY = 1; }

            this.target = target;
            this.lerp.set(lerpX, lerpY);

            var helper;

            switch (style) {

                case Phaser.Camera.FOLLOW_PLATFORMER:
                    var w = this.width / 8;
                    var h = this.height / 3;
                    this.deadzone = new Phaser.Rectangle((this.width - w) / 2, (this.height - h) / 2 - h * 0.25, w, h);
                    break;

                case Phaser.Camera.FOLLOW_TOPDOWN:
                    helper = Math.max(this.width, this.height) / 4;
                    this.deadzone = new Phaser.Rectangle((this.width - helper) / 2, (this.height - helper) / 2, helper, helper);
                    break;

                case Phaser.Camera.FOLLOW_TOPDOWN_TIGHT:
                    helper = Math.max(this.width, this.height) / 8;
                    this.deadzone = new Phaser.Rectangle((this.width - helper) / 2, (this.height - helper) / 2, helper, helper);
                    break;

                case Phaser.Camera.FOLLOW_LOCKON:
                    this.deadzone = null;
                    break;

                default:
                    this.deadzone = null;
                    break;
            }

        },

        /**
        * Sets the Camera follow target to null, stopping it from following an object if it's doing so.
        *
        * @method Phaser.Camera#unfollow
        */
        unfollow: function () {

            this.target = null;

        },

        /**
        * Move the camera focus on a display object instantly.
        * @method Phaser.Camera#focusOn
        * @param {any} displayObject - The display object to focus the camera on. Must have visible x/y properties.
        */
        focusOn: function (displayObject) {

            this.setPosition(Math.round(displayObject.x - this.view.halfWidth), Math.round(displayObject.y - this.view.halfHeight));

        },

        /**
        * Move the camera focus on a location instantly.
        * @method Phaser.Camera#focusOnXY
        * @param {number} x - X position.
        * @param {number} y - Y position.
        */
        focusOnXY: function (x, y) {

            this.setPosition(Math.round(x - this.view.halfWidth), Math.round(y - this.view.halfHeight));

        },

        /**
        * This creates a camera shake effect. It works by applying a random amount of additional
        * spacing on the x and y axis each frame. You can control the intensity and duration
        * of the effect, and if it should effect both axis or just one.
        *
        * When the shake effect ends the signal Camera.onShakeComplete is dispatched.
        *
        * @method Phaser.Camera#shake
        * @param {float} [intensity=0.05] - The intensity of the camera shake. Given as a percentage of the camera size representing the maximum distance that the camera can move while shaking.
        * @param {number} [duration=500] - The duration of the shake effect in milliseconds.
        * @param {boolean} [force=true] - If a camera shake effect is already running and force is true it will replace the previous effect, resetting the duration.
        * @param {number} [direction=Phaser.Camera.SHAKE_BOTH] - The directions in which the camera can shake. Either Phaser.Camera.SHAKE_BOTH, Phaser.Camera.SHAKE_HORIZONTAL or Phaser.Camera.SHAKE_VERTICAL.
        * @param {boolean} [shakeBounds=true] - Is the effect allowed to shake the camera beyond its bounds (if set?).
        * @return {boolean} True if the shake effect was started, otherwise false.
        */
        shake: function (intensity, duration, force, direction, shakeBounds) {

            if (intensity === undefined) { intensity = 0.05; }
            if (duration === undefined) { duration = 500; }
            if (force === undefined) { force = true; }
            if (direction === undefined) { direction = Phaser.Camera.SHAKE_BOTH; }
            if (shakeBounds === undefined) { shakeBounds = true; }

            if (!force && this._shake.duration > 0)
            {
                //  Can't reset an already running shake
                return false;
            }

            this._shake.intensity = intensity;
            this._shake.duration = duration;
            this._shake.shakeBounds = shakeBounds;

            this._shake.x = 0;
            this._shake.y = 0;

            this._shake.horizontal = (direction === Phaser.Camera.SHAKE_BOTH || direction === Phaser.Camera.SHAKE_HORIZONTAL);
            this._shake.vertical = (direction === Phaser.Camera.SHAKE_BOTH || direction === Phaser.Camera.SHAKE_VERTICAL);

            return true;

        },

        /**
        * This creates a camera flash effect. It works by filling the game with the solid fill
        * color specified, and then fading it away to alpha 0 over the duration given.
        *
        * You can use this for things such as hit feedback effects.
        *
        * When the effect ends the signal Camera.onFlashComplete is dispatched.
        *
        * @method Phaser.Camera#flash
        * @param {numer} [color=0xffffff] - The color of the flash effect. I.e. 0xffffff for white, 0xff0000 for red, etc.
        * @param {number} [duration=500] - The duration of the flash effect in milliseconds.
        * @param {boolean} [force=false] - If a camera flash or fade effect is already running and force is true it will replace the previous effect, resetting the duration.
        * @return {boolean} True if the effect was started, otherwise false.
        */
        flash: function (color, duration, force) {

            if (color === undefined) { color = 0xffffff; }
            if (duration === undefined) { duration = 500; }
            if (force === undefined) { force = false; }

            if (!this.fx || (!force && this._fxDuration > 0))
            {
                return false;
            }

            this.fx.clear();

            this.fx.beginFill(color);
            this.fx.drawRect(0, 0, this.width, this.height);
            this.fx.endFill();

            this.fx.alpha = 1;

            this._fxDuration = duration;
            this._fxType = 0;

            return true;

        },

        /**
        * This creates a camera fade effect. It works by filling the game with the
        * color specified, over the duration given, ending with a solid fill.
        *
        * You can use this for things such as transitioning to a new scene.
        *
        * The game will be left 'filled' at the end of this effect, likely obscuring
        * everything. In order to reset it you can call `Camera.resetFX` and it will clear the
        * fade. Or you can call `Camera.flash` with the same color as the fade, and it will
        * reverse the process, bringing the game back into view again.
        *
        * When the effect ends the signal Camera.onFadeComplete is dispatched.
        *
        * @method Phaser.Camera#fade
        * @param {numer} [color=0x000000] - The color the game will fade to. I.e. 0x000000 for black, 0xff0000 for red, etc.
        * @param {number} [duration=500] - The duration of the fade in milliseconds.
        * @param {boolean} [force=false] - If a camera flash or fade effect is already running and force is true it will replace the previous effect, resetting the duration.
        * @return {boolean} True if the effect was started, otherwise false.
        */
        fade: function (color, duration, force) {

            if (color === undefined) { color = 0x000000; }
            if (duration === undefined) { duration = 500; }
            if (force === undefined) { force = false; }

            if (!this.fx || (!force && this._fxDuration > 0))
            {
                return false;
            }

            this.fx.clear();

            this.fx.beginFill(color);
            this.fx.drawRect(0, 0, this.width, this.height);
            this.fx.endFill();

            this.fx.alpha = 0;

            this._fxDuration = duration;
            this._fxType = 1;

            return true;

        },

        /**
        * The camera update loop. This is called automatically by the core game loop.
        *
        * @method Phaser.Camera#update
        * @protected
        */
        update: function () {

            if (this._fxDuration > 0)
            {
                this.updateFX();
            }

            if (this._shake.duration > 0)
            {
                this.updateShake();
            }

            if (this.bounds)
            {
                this.checkBounds();
            }

            if (this.roundPx)
            {
                this.view.floor();
                this._shake.x = Math.floor(this._shake.x);
                this._shake.y = Math.floor(this._shake.y);
            }

            this.displayObject.position.x = -this.view.x;
            this.displayObject.position.y = -this.view.y;

        },

        /**
        * Update the camera flash and fade effects.
        *
        * @method Phaser.Camera#updateFX
        * @private
        */
        updateFX: function () {

            if (this._fxType === 0)
            {
                //  flash
                this.fx.alpha -= this.game.time.elapsedMS / this._fxDuration;

                if (this.fx.alpha <= 0)
                {
                    this._fxDuration = 0;
                    this.fx.alpha = 0;
                    this.onFlashComplete.dispatch();
                }
            }
            else
            {
                //  fade
                this.fx.alpha += this.game.time.elapsedMS / this._fxDuration;

                if (this.fx.alpha >= 1)
                {
                    this._fxDuration = 0;
                    this.fx.alpha = 1;
                    this.onFadeComplete.dispatch();
                }
            }

        },

        /**
        * Update the camera shake effect.
        *
        * @method Phaser.Camera#updateShake
        * @private
        */
        updateShake: function () {

            this._shake.duration -= this.game.time.elapsedMS;

            if (this._shake.duration <= 0)
            {
                this.onShakeComplete.dispatch();
                this._shake.x = 0;
                this._shake.y = 0;
            }
            else
            {
                if (this._shake.horizontal)
                {
                    this._shake.x = this.game.rnd.frac() * this._shake.intensity * this.view.width * 2 - this._shake.intensity * this.view.width;
                }

                if (this._shake.vertical)
                {
                    this._shake.y = this.game.rnd.frac() * this._shake.intensity * this.view.height * 2 - this._shake.intensity * this.view.height;
                }
            }

        },

        /**
        * Internal method that handles tracking a sprite.
        *
        * @method Phaser.Camera#updateTarget
        * @private
        */
        updateTarget: function () {

            this._targetPosition.x = this.view.x + this.target.worldPosition.x;
            this._targetPosition.y = this.view.y + this.target.worldPosition.y;

            if (this.deadzone)
            {
                this._edge = this._targetPosition.x - this.view.x;

                if (this._edge < this.deadzone.left)
                {
                    this.view.x = this.game.math.linear(this.view.x, this._targetPosition.x - this.deadzone.left, this.lerp.x);
                }
                else if (this._edge > this.deadzone.right)
                {
                    this.view.x = this.game.math.linear(this.view.x, this._targetPosition.x - this.deadzone.right, this.lerp.x);
                }

                this._edge = this._targetPosition.y - this.view.y;

                if (this._edge < this.deadzone.top)
                {
                    this.view.y = this.game.math.linear(this.view.y, this._targetPosition.y - this.deadzone.top, this.lerp.y);
                }
                else if (this._edge > this.deadzone.bottom)
                {
                    this.view.y = this.game.math.linear(this.view.y, this._targetPosition.y - this.deadzone.bottom, this.lerp.y);
                }
            }
            else
            {
                this.view.x = this.game.math.linear(this.view.x, this._targetPosition.x - this.view.halfWidth, this.lerp.x);
                this.view.y = this.game.math.linear(this.view.y, this._targetPosition.y - this.view.halfHeight, this.lerp.y);
            }

            if (this.bounds)
            {
                this.checkBounds();
            }

            if (this.roundPx)
            {
                this.view.floor();
            }

            this.displayObject.position.x = -this.view.x;
            this.displayObject.position.y = -this.view.y;

        },

        /**
        * Update the Camera bounds to match the game world.
        *
        * @method Phaser.Camera#setBoundsToWorld
        */
        setBoundsToWorld: function () {

            if (this.bounds)
            {
                this.bounds.copyFrom(this.game.world.bounds);
            }

        },

        /**
        * Method called to ensure the camera doesn't venture outside of the game world.
        * Called automatically by Camera.update.
        *
        * @method Phaser.Camera#checkBounds
        * @protected
        */
        checkBounds: function () {

            this.atLimit.x = false;
            this.atLimit.y = false;

            var vx = this.view.x + this._shake.x;
            var vw = this.view.right + this._shake.x;
            var vy = this.view.y + this._shake.y;
            var vh = this.view.bottom + this._shake.y;

            //  Make sure we didn't go outside the cameras bounds
            if (vx <= this.bounds.x * this.scale.x)
            {
                this.atLimit.x = true;
                this.view.x = this.bounds.x * this.scale.x;

                if (!this._shake.shakeBounds)
                {
                    //  The camera is up against the bounds, so reset the shake
                    this._shake.x = 0;
                }
            }

            if (vw >= this.bounds.right * this.scale.x)
            {
                this.atLimit.x = true;
                this.view.x = (this.bounds.right * this.scale.x) - this.width;

                if (!this._shake.shakeBounds)
                {
                    //  The camera is up against the bounds, so reset the shake
                    this._shake.x = 0;
                }
            }

            if (vy <= this.bounds.top * this.scale.y)
            {
                this.atLimit.y = true;
                this.view.y = this.bounds.top * this.scale.y;

                if (!this._shake.shakeBounds)
                {
                    //  The camera is up against the bounds, so reset the shake
                    this._shake.y = 0;
                }
            }

            if (vh >= this.bounds.bottom * this.scale.y)
            {
                this.atLimit.y = true;
                this.view.y = (this.bounds.bottom * this.scale.y) - this.height;

                if (!this._shake.shakeBounds)
                {
                    //  The camera is up against the bounds, so reset the shake
                    this._shake.y = 0;
                }
            }

        },

        /**
        * A helper function to set both the X and Y properties of the camera at once
        * without having to use game.camera.x and game.camera.y.
        *
        * @method Phaser.Camera#setPosition
        * @param {number} x - X position.
        * @param {number} y - Y position.
        */
        setPosition: function (x, y) {

            this.view.x = x;
            this.view.y = y;

            if (this.bounds)
            {
                this.checkBounds();
            }

        },

        /**
        * Sets the size of the view rectangle given the width and height in parameters.
        *
        * @method Phaser.Camera#setSize
        * @param {number} width - The desired width.
        * @param {number} height - The desired height.
        */
        setSize: function (width, height) {

            this.view.width = width;
            this.view.height = height;

        },

        /**
        * Resets the camera back to 0,0 and un-follows any object it may have been tracking.
        * Also immediately resets any camera effects that may have been running such as
        * shake, flash or fade.
        *
        * @method Phaser.Camera#reset
        */
        reset: function () {

            this.target = null;

            this.view.x = 0;
            this.view.y = 0;

            this._shake.duration = 0;

            this.resetFX();

        },

        /**
        * Resets any active FX, such as a fade or flash and immediately clears it.
        * Useful to calling after a fade in order to remove the fade from the Stage.
        *
        * @method Phaser.Camera#resetFX
        */
        resetFX: function () {

            this.fx.clear();

            this.fx.alpha = 0;

            this._fxDuration = 0;

        }

    };

    Phaser.Camera.prototype.constructor = Phaser.Camera;

    /**
    * The Cameras x coordinate. This value is automatically clamped if it falls outside of the World bounds.
    * @name Phaser.Camera#x
    * @property {number} x - Gets or sets the cameras x position.
    */
    Object.defineProperty(Phaser.Camera.prototype, "x", {

        get: function () {

            return this.view.x;

        },

        set: function (value) {

            this.view.x = value;

            if (this.bounds)
            {
                this.checkBounds();
            }
        }

    });

    /**
    * The Cameras y coordinate. This value is automatically clamped if it falls outside of the World bounds.
    * @name Phaser.Camera#y
    * @property {number} y - Gets or sets the cameras y position.
    */
    Object.defineProperty(Phaser.Camera.prototype, "y", {

        get: function () {

            return this.view.y;

        },

        set: function (value) {

            this.view.y = value;

            if (this.bounds)
            {
                this.checkBounds();
            }
        }

    });

    /**
    * The Cameras position. This value is automatically clamped if it falls outside of the World bounds.
    * @name Phaser.Camera#position
    * @property {Phaser.Point} position - Gets or sets the cameras xy position using Phaser.Point object.
    */
    Object.defineProperty(Phaser.Camera.prototype, "position", {

        get: function () {

            this._position.set(this.view.x, this.view.y);

            return this._position;

        },

        set: function (value) {

            if (typeof value.x !== "undefined") { this.view.x = value.x; }
            if (typeof value.y !== "undefined") { this.view.y = value.y; }

            if (this.bounds)
            {
                this.checkBounds();
            }
        }

    });

    /**
    * The Cameras width. By default this is the same as the Game size and should not be adjusted for now.
    * @name Phaser.Camera#width
    * @property {number} width - Gets or sets the cameras width.
    */
    Object.defineProperty(Phaser.Camera.prototype, "width", {

        get: function () {

            return this.view.width;

        },

        set: function (value) {

            this.view.width = value;

        }

    });

    /**
    * The Cameras height. By default this is the same as the Game size and should not be adjusted for now.
    * @name Phaser.Camera#height
    * @property {number} height - Gets or sets the cameras height.
    */
    Object.defineProperty(Phaser.Camera.prototype, "height", {

        get: function () {

            return this.view.height;

        },

        set: function (value) {

            this.view.height = value;

        }

    });

    /**
    * The Cameras shake intensity.
    * @name Phaser.Camera#shakeIntensity
    * @property {number} shakeIntensity - Gets or sets the cameras shake intensity.
    */
    Object.defineProperty(Phaser.Camera.prototype, "shakeIntensity", {

        get: function () {

            return this._shake.intensity;

        },

        set: function (value) {

            this._shake.intensity = value;

        }

    });