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<!DOCTYPE html>
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<title>Phaser Source: core/Group.js</title>
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<h1 class="page-title">Source: core/Group.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2014 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* Phaser Group constructor.
* @class Phaser.Group
* @classdesc A Group is a container for display objects that allows for fast pooling and object recycling. Groups can be nested within other Groups and have their own local transforms.
* @constructor
* @param {Phaser.Game} game - A reference to the currently running game.
* @param {Phaser.Group|Phaser.Sprite|null} parent - The parent Group, DisplayObject or DisplayObjectContainer that this Group will be added to. If `undefined` it will use game.world. If null it won't be added to anything.
* @param {string} [name=group] - A name for this Group. Not used internally but useful for debugging.
* @param {boolean} [addToStage=false] - If set to true this Group will be added directly to the Game.Stage instead of Game.World.
* @param {boolean} [enableBody=false] - If true all Sprites created with `Group.create` or `Group.createMulitple` will have a physics body created on them. Change the body type with physicsBodyType.
* @param {number} [physicsBodyType=0] - If enableBody is true this is the type of physics body that is created on new Sprites. Phaser.Physics.ARCADE, Phaser.Physics.P2, Phaser.Physics.NINJA, etc.
*/
Phaser.Group = function (game, parent, name, addToStage, enableBody, physicsBodyType) {
if (typeof addToStage === 'undefined') { addToStage = false; }
if (typeof enableBody === 'undefined') { enableBody = false; }
if (typeof physicsBodyType === 'undefined') { physicsBodyType = Phaser.Physics.ARCADE; }
/**
* @property {Phaser.Game} game - A reference to the currently running Game.
*/
this.game = game;
if (typeof parent === 'undefined')
{
parent = game.world;
}
/**
* @property {string} name - A name for this Group. Not used internally but useful for debugging.
*/
this.name = name || 'group';
PIXI.DisplayObjectContainer.call(this);
if (addToStage)
{
this.game.stage.addChild(this);
}
else
{
if (parent)
{
parent.addChild(this);
}
}
/**
* @property {number} z - The z-depth value of this object within its Group (remember the World is a Group as well). No two objects in a Group can have the same z value.
*/
this.z = 0;
/**
* @property {number} type - Internal Phaser Type value.
* @protected
*/
this.type = Phaser.GROUP;
/**
* @property {boolean} alive - The alive property is useful for Groups that are children of other Groups and need to be included/excluded in checks like forEachAlive.
* @default
*/
this.alive = true;
/**
* @property {boolean} exists - If exists is true the Group is updated, otherwise it is skipped.
* @default
*/
this.exists = true;
/**
* The type of objects that will be created when you use Group.create or Group.createMultiple. Defaults to Phaser.Sprite.
* When a new object is created it is passed the following parameters to its constructor: game, x, y, key, frame.
* @property {object} classType
* @default
*/
this.classType = Phaser.Sprite;
/**
* @property {Phaser.Group|Phaser.Sprite} parent - The parent of this Group.
*/
/**
* @property {Phaser.Point} scale - The scale of the Group container.
*/
this.scale = new Phaser.Point(1, 1);
/**
* @property {Phaser.Point} pivot - The pivot point of the Group container.
*/
/**
* The cursor is a simple way to iterate through the objects in a Group using the Group.next and Group.previous functions.
* The cursor is set to the first child added to the Group and doesn't change unless you call next, previous or set it directly with Group.cursor.
* @property {any} cursor - The current display object that the Group cursor is pointing to.
*/
this.cursor = null;
/**
* @property {Phaser.Point} cameraOffset - If this object is fixedToCamera then this stores the x/y offset that its drawn at, from the top-left of the camera view.
*/
this.cameraOffset = new Phaser.Point();
/**
* @property {boolean} enableBody - If true all Sprites created by, or added to this Group, will have a physics body enabled on them. Change the body type with `Group.physicsBodyType`.
* @default
*/
this.enableBody = enableBody;
/**
* @property {boolean} enableBodyDebug - If true when a physics body is created (via Group.enableBody) it will create a physics debug object as well. Only works for P2 bodies.
*/
this.enableBodyDebug = false;
/**
* @property {number} physicsBodyType - If Group.enableBody is true this is the type of physics body that is created on new Sprites. Phaser.Physics.ARCADE, Phaser.Physics.P2, Phaser.Physics.NINJA, etc.
*/
this.physicsBodyType = physicsBodyType;
/**
* @property {string} _sortProperty - The property on which children are sorted.
* @private
*/
this._sortProperty = 'z';
/**
* A small internal cache:
* 0 = previous position.x
* 1 = previous position.y
* 2 = previous rotation
* 3 = renderID
* 4 = fresh? (0 = no, 1 = yes)
* 5 = outOfBoundsFired (0 = no, 1 = yes)
* 6 = exists (0 = no, 1 = yes)
* 7 = fixed to camera (0 = no, 1 = yes)
* 8 = cursor index
* 9 = sort order
* @property {Array} _cache
* @private
*/
this._cache = [ 0, 0, 0, 0, 1, 0, 1, 0, 0, 0 ];
};
Phaser.Group.prototype = Object.create(PIXI.DisplayObjectContainer.prototype);
Phaser.Group.prototype.constructor = Phaser.Group;
/**
* @constant
* @type {number}
*/
Phaser.Group.RETURN_NONE = 0;
/**
* @constant
* @type {number}
*/
Phaser.Group.RETURN_TOTAL = 1;
/**
* @constant
* @type {number}
*/
Phaser.Group.RETURN_CHILD = 2;
/**
* @constant
* @type {number}
*/
Phaser.Group.SORT_ASCENDING = -1;
/**
* @constant
* @type {number}
*/
Phaser.Group.SORT_DESCENDING = 1;
/**
* Adds an existing object to this Group. The object can be an instance of Phaser.Sprite, Phaser.Button or any other display object.
* The child is automatically added to the top of the Group, so renders on-top of everything else within the Group. If you need to control
* that then see the addAt method.
*
* @see Phaser.Group#create
* @see Phaser.Group#addAt
* @method Phaser.Group#add
* @param {*} child - An instance of Phaser.Sprite, Phaser.Button or any other display object..
* @param {boolean} [silent=false] - If the silent parameter is `true` the child will not dispatch the onAddedToGroup event.
* @return {*} The child that was added to the Group.
*/
Phaser.Group.prototype.add = function (child, silent) {
if (typeof silent === 'undefined') { silent = false; }
if (child.parent !== this)
{
if (this.enableBody)
{
this.game.physics.enable(child, this.physicsBodyType);
}
this.addChild(child);
child.z = this.children.length;
if (!silent && child.events)
{
child.events.onAddedToGroup.dispatch(child, this);
}
if (this.cursor === null)
{
this.cursor = child;
}
}
return child;
};
/**
* Adds an existing object to this Group. The object can be an instance of Phaser.Sprite, Phaser.Button or any other display object.
* The child is added to the Group at the location specified by the index value, this allows you to control child ordering.
*
* @method Phaser.Group#addAt
* @param {*} child - An instance of Phaser.Sprite, Phaser.Button or any other display object..
* @param {number} index - The index within the Group to insert the child to.
* @param {boolean} [silent=false] - If the silent parameter is `true` the child will not dispatch the onAddedToGroup event.
* @return {*} The child that was added to the Group.
*/
Phaser.Group.prototype.addAt = function (child, index, silent) {
if (typeof silent === 'undefined') { silent = false; }
if (child.parent !== this)
{
if (this.enableBody)
{
this.game.physics.enable(child, this.physicsBodyType);
}
this.addChildAt(child, index);
this.updateZ();
if (!silent && child.events)
{
child.events.onAddedToGroup.dispatch(child, this);
}
if (this.cursor === null)
{
this.cursor = child;
}
}
return child;
};
/**
* Returns the child found at the given index within this Group.
*
* @method Phaser.Group#getAt
* @param {number} index - The index to return the child from.
* @return {*} The child that was found at the given index. If the index was out of bounds then this will return -1.
*/
Phaser.Group.prototype.getAt = function (index) {
if (index < 0 || index >= this.children.length)
{
return -1;
}
else
{
return this.getChildAt(index);
}
};
/**
* Automatically creates a new Phaser.Sprite object and adds it to the top of this Group.
* You can change Group.classType to any object and this call will create an object of that type instead, but it should extend either Sprite or Image.
*
* @method Phaser.Group#create
* @param {number} x - The x coordinate to display the newly created Sprite at. The value is in relation to the Group.x point.
* @param {number} y - The y coordinate to display the newly created Sprite at. The value is in relation to the Group.y point.
* @param {string} key - The Game.cache key of the image that this Sprite will use.
* @param {number|string} [frame] - If the Sprite image contains multiple frames you can specify which one to use here.
* @param {boolean} [exists=true] - The default exists state of the Sprite.
* @return {Phaser.Sprite|object} The child that was created. Will be a Phaser.Sprite unless Group.classType has been changed.
*/
Phaser.Group.prototype.create = function (x, y, key, frame, exists) {
if (typeof exists === 'undefined') { exists = true; }
var child = new this.classType(this.game, x, y, key, frame);
if (this.enableBody)
{
this.game.physics.enable(child, this.physicsBodyType, this.enableBodyDebug);
}
child.exists = exists;
child.visible = exists;
child.alive = exists;
this.addChild(child);
child.z = this.children.length;
if (child.events)
{
child.events.onAddedToGroup.dispatch(child, this);
}
if (this.cursor === null)
{
this.cursor = child;
}
return child;
};
/**
* Automatically creates multiple Phaser.Sprite objects and adds them to the top of this Group.
* Useful if you need to quickly generate a pool of identical sprites, such as bullets. By default the sprites will be set to not exist
* and will be positioned at 0, 0 (relative to the Group.x/y)
* You can change Group.classType to any object and this call will create an object of that type instead, but it should extend either Sprite or Image.
*
* @method Phaser.Group#createMultiple
* @param {number} quantity - The number of Sprites to create.
* @param {string} key - The Game.cache key of the image that this Sprite will use.
* @param {number|string} [frame] - If the Sprite image contains multiple frames you can specify which one to use here.
* @param {boolean} [exists=false] - The default exists state of the Sprite.
*/
Phaser.Group.prototype.createMultiple = function (quantity, key, frame, exists) {
if (typeof exists === 'undefined') { exists = false; }
for (var i = 0; i < quantity; i++)
{
this.create(0, 0, key, frame, exists);
}
};
/**
* Internal method that re-applies all of the childrens Z values.
*
* @method Phaser.Group#updateZ
* @protected
*/
Phaser.Group.prototype.updateZ = function () {
var i = this.children.length;
while (i--)
{
this.children[i].z = i;
}
};
/**
* Sets the Group cursor to the first object in the Group. If the optional index parameter is given it sets the cursor to the object at that index instead.
*
* @method Phaser.Group#resetCursor
* @param {number} [index=0] - Set the cursor to point to a specific index.
* @return {*} The child the cursor now points to.
*/
Phaser.Group.prototype.resetCursor = function (index) {
if (typeof index === 'undefined') { index = 0; }
if (index > this.children.length - 1)
{
index = 0;
}
if (this.cursor)
{
this._cache[8] = index;
this.cursor = this.children[this._cache[8]];
return this.cursor;
}
};
/**
* Advances the Group cursor to the next object in the Group. If it's at the end of the Group it wraps around to the first object.
*
* @method Phaser.Group#next
* @return {*} The child the cursor now points to.
*/
Phaser.Group.prototype.next = function () {
if (this.cursor)
{
// Wrap the cursor?
if (this._cache[8] >= this.children.length - 1)
{
this._cache[8] = 0;
}
else
{
this._cache[8]++;
}
this.cursor = this.children[this._cache[8]];
return this.cursor;
}
};
/**
* Moves the Group cursor to the previous object in the Group. If it's at the start of the Group it wraps around to the last object.
*
* @method Phaser.Group#previous
* @return {*} The child the cursor now points to.
*/
Phaser.Group.prototype.previous = function () {
if (this.cursor)
{
// Wrap the cursor?
if (this._cache[8] === 0)
{
this._cache[8] = this.children.length - 1;
}
else
{
this._cache[8]--;
}
this.cursor = this.children[this._cache[8]];
return this.cursor;
}
};
/**
* Swaps the position of two children in this Group. Both children must be in this Group.
* You cannot swap a child with itself, or swap un-parented children, doing so will return false.
*
* @method Phaser.Group#swap
* @param {*} child1 - The first child to swap.
* @param {*} child2 - The second child to swap.
*/
Phaser.Group.prototype.swap = function (child1, child2) {
var result = this.swapChildren(child1, child2);
if (result)
{
this.updateZ();
}
return result;
};
/**
* Brings the given child to the top of this Group so it renders above all other children.
*
* @method Phaser.Group#bringToTop
* @param {*} child - The child to bring to the top of this Group.
* @return {*} The child that was moved.
*/
Phaser.Group.prototype.bringToTop = function (child) {