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<h1 class="file-heading">File: pixi/loaders/SpriteSheetLoader.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* The sprite sheet loader is used to load in JSON sprite sheet data
* To generate the data you can use http://www.codeandweb.com/texturepacker and publish the "JSON" format
* There is a free version so thats nice, although the paid version is great value for money.
* It is highly recommended to use Sprite sheets (also know as texture atlas') as it means sprite's can be batched and drawn together for highly increased rendering speed.
* Once the data has been loaded the frames are stored in the PIXI texture cache and can be accessed though PIXI.Texture.fromFrameId() and PIXI.Sprite.fromFromeId()
* This loader will also load the image file that the Spritesheet points to as well as the data.
* When loaded this class will dispatch a 'loaded' event
* @class SpriteSheetLoader
* @extends EventTarget
* @constructor
* @param url {String} the url of the sprite sheet JSON file
*/
PIXI.SpriteSheetLoader = function(url)
{
/*
* i use texture packer to load the assets..
* http://www.codeandweb.com/texturepacker
* make sure to set the format as "JSON"
*/
PIXI.EventTarget.call( this );
this.url = url;
this.baseUrl = url.replace(/[^\/]*$/, '');
this.texture;
this.frames = {};
}
// constructor
PIXI.SpriteSheetLoader.constructor = PIXI.SpriteSheetLoader;
/**
* This will begin loading the JSON file
*/
PIXI.SpriteSheetLoader.prototype.load = function()
{
this.ajaxRequest = new AjaxRequest();
var scope = this;
this.ajaxRequest.onreadystatechange=function()
{
scope.onLoaded();
}
this.ajaxRequest.open("GET", this.url, true)
this.ajaxRequest.send(null)
}
PIXI.SpriteSheetLoader.prototype.onLoaded = function()
{
if (this.ajaxRequest.readyState==4)
{
if (this.ajaxRequest.status==200 || window.location.href.indexOf("http")==-1)
{
var jsondata = eval("("+this.ajaxRequest.responseText+")");
var textureUrl = this.baseUrl + jsondata.meta.image;
this.texture = PIXI.Texture.fromImage(textureUrl).baseTexture;
// if(!this.texture)this.texture = new PIXI.Texture(textureUrl);
var frameData = jsondata.frames;
for (var i in frameData)
{
var rect = frameData[i].frame;
PIXI.TextureCache[i] = new PIXI.Texture(this.texture, {x:rect.x, y:rect.y, width:rect.w, height:rect.h});
if(frameData[i].trimmed)
{
//var realSize = frameData[i].spriteSourceSize;
PIXI.TextureCache[i].realSize = frameData[i].spriteSourceSize;
PIXI.TextureCache[i].trim.x = 0// (realSize.x / rect.w)
// calculate the offset!
}
// this.frames[i] = ;
}
if(this.texture.hasLoaded)
{
this.dispatchEvent( { type: 'loaded', content: this } );
}
else
{
var scope = this;
// wait for the texture to load..
this.texture.addEventListener('loaded', function(){
scope.dispatchEvent( { type: 'loaded', content: scope } );
});
}
}
}
}
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