The atlas file loader is used to load in Texture Atlas data and parse it. When loaded this class will dispatch a 'loaded' event. If loading fails this class will dispatch an 'error' event.

To generate the data you can use http://www.codeandweb.com/texturepacker and publish in the 'JSON' format.

It is highly recommended to use texture atlases (also know as 'sprite sheets') as it allowed sprites to 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.fromFrameId()