starling-handbook-preview

Relative Positioning
Right now, we are creating a Flash game with a fixed size of 320x480 pixels.
However, I’d like to port the game to mobile, later.
Mobile devices have all kinds of different screen sizes, so it’s a good idea to take
that into account right away. I’m doing that by working with relative instead of
absolute positions.
// bad: fixed position
_cloud1.x = 160;
// better: relative position
_cloud1.x = _width * 0.5;
What’s left to do, of course, is to reference this new class from Game.as. Here’s how it should look
like now:
Game.as
public class Game extends Sprite
{
private static var sAssets:AssetManager;
private var _world:World; 1
public function Game()
{ }
public function start(assets:AssetManager):void
{
sAssets = assets;
}
_world = new World(stage.stageWidth, stage.stageHeight); 2
addChild(_world);
}
public static function get assets():AssetManager
{
return sAssets;
}
1 Add a new member variable.
2 Instantiate the new class (passing the stage dimensions along) and add it to the stage.
Compile and run to check if everything worked out. Except for the two inconspicuous new clouds, it
should look just like before.
11