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<h1 class="page-title">Source: core/Camera.js</h1>
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<pre class="sunlight-highlight-javascript linenums">/**
* @author Richard Davey &lt;rich@photonstorm.com>
* @copyright 2013 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.
* Objects outside of this view are not rendered (unless set to ignore the Camera, i.e. UI?).
* @property {Phaser.Rectangle} view
*/
this.view = new Phaser.Rectangle(x, y, width, height);
/**
* @property {Phaser.Rectangle} screenView - Used by Sprites to work out Camera culling.
*/
this.screenView = new Phaser.Rectangle(x, y, width, height);
/**
* @property {Phaser.Rectangle} deadzone - Moving inside this Rectangle will not cause camera moving.
*/
this.deadzone = null;
/**
* @property {boolean} visible - Whether this camera is visible or not.
* @default
*/
this.visible = 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 {number} edge - Edge property.
* @private
* @default
*/
this._edge = 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;
Phaser.Camera.prototype = {
/**
* Tells this camera which sprite to follow.
* @method Phaser.Camera#follow
* @param {Phaser.Sprite} 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().
*/
follow: function (target, style) {
if (typeof style === "undefined") { style = Phaser.Camera.FOLLOW_LOCKON; }
this.target = target;
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:
default:
this.deadzone = null;
break;
}
},
/**
* Move the camera focus to a location instantly.
* @method Phaser.Camera#focusOnXY
* @param {number} x - X position.
* @param {number} y - Y position.
*/
focusOnXY: function (x, y) {
this.view.x = Math.round(x - this.view.halfWidth);
this.view.y = Math.round(y - this.view.halfHeight);
},
/**
* Update focusing and scrolling.
* @method Phaser.Camera#update
*/
update: function () {
// Add dirty flag
if (this.target !== null)
{
if (this.deadzone)
{
this._edge = this.target.x - this.deadzone.x;
if (this.view.x > this._edge)
{
this.view.x = this._edge;
}
this._edge = this.target.x + this.target.width - this.deadzone.x - this.deadzone.width;
if (this.view.x &lt; this._edge)
{
this.view.x = this._edge;
}
this._edge = this.target.y - this.deadzone.y;
if (this.view.y > this._edge)
{
this.view.y = this._edge;
}
this._edge = this.target.y + this.target.height - this.deadzone.y - this.deadzone.height;
if (this.view.y &lt; this._edge)
{
this.view.y = this._edge;
}
}
else
{
this.focusOnXY(this.target.x, this.target.y);
}
}
this.checkWorldBounds();
},
/**
* Method called to ensure the camera doesn't venture outside of the game world.
* @method Phaser.Camera#checkWorldBounds
*/
checkWorldBounds: function () {
this.atLimit.x = false;
this.atLimit.y = false;
// Make sure we didn't go outside the cameras worldBounds
if (this.view.x &lt; this.world.bounds.left)
{
this.atLimit.x = true;
this.view.x = this.world.bounds.left;
}
if (this.view.x > this.world.bounds.right - this.width)
{
this.atLimit.x = true;
this.view.x = (this.world.bounds.right - this.width) + 1;
}
if (this.view.y &lt; this.world.bounds.top)
{
this.atLimit.y = true;
this.view.y = this.world.bounds.top;
}
if (this.view.y > this.world.bounds.bottom - this.height)
{
this.atLimit.y = true;
this.view.y = (this.world.bounds.bottom - this.height) + 1;
}
this.view.floor();
},
/**
* 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;
this.checkWorldBounds();
},
/**
* 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;
}
};
/**
* 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;
this.checkWorldBounds();
}
});
/**
* 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;
this.checkWorldBounds();
}
});
/**
* 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;
}
});
</pre>
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