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J2ME Gaming API: An Overview


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J2ME Gaming API: An Overview


A D V E R T I S E M E N T

There are only five classes in the javax.microedition.lcdui.game package: GameCanvas, Layer, Sprite, TiledLayer, and LayerManager. These five classes are enough to provide a platform for the development of games with a wide range of capabilities.

The Layer class is the superclass of the Sprite and TiledLayer classes. This class abstracts the behavior of a visual element in a game. This element can be a sprite, which represents an independent graphic (or a collection of graphics for animation) that can be moved around the game screen, or a tiled layer, which represents a graphic that can be used to create vast game backgrounds with only a handful of images. You use the Layer classes for positioning and visibility. The subclasses override the paint(Graphics g) method, which has the task of rendering the elements on the screen.

The LayerManager class provides a convenient mechanism to manage the various visual elements of a game (sprites and tiled layers) by rendering the proper layer in the proper order.

The GameCanvas class is made useful by extending the functionality of the Canvas class . It provides an off-screen buffer, to which all rendering operations are done before flushing them on the device screen. It also provides an easy-to-use mechanism to query the current keys being pressed by the user.

The best way to introduce you to these classes is with the help of a working game example, which we will build from the ground up, explaining the various facets of a game. This is helpful whether or not you have programmed a game before, if you are looking to learn how to do it for the wireless devices using J2ME's gaming API. After a quick introduction to game building (for those who have never created a game), the remaining sections introduce each of the classes from the javax.microedition.lcdui.game package, with the help of a concise but complete game.



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