import org.newdawn.slick.util.MaskUtil; //导入依赖的package包/类
/**
 * @see org.newdawn.slick.state.transition.Transition#preRender(org.newdawn.slick.state.StateBasedGame, org.newdawn.slick.GameContainer, org.newdawn.slick.Graphics)
 */
public void preRender(StateBasedGame game, GameContainer container,
		Graphics g) throws SlickException {
	prev.render(container, game, g);
	
	MaskUtil.defineMask();
	for (int i=0;i<blobs.size();i++) {
		((Blob) blobs.get(i)).render(g);
	}
	MaskUtil.finishDefineMask();

	MaskUtil.drawOnMask();
	if (background != null) {
		Color c = g.getColor();
		g.setColor(background);
		g.fillRect(0,0,container.getWidth(),container.getHeight());
		g.setColor(c);
	}
}
 

import org.newdawn.slick.util.MaskUtil; //导入依赖的package包/类
/**
 * @see org.newdawn.slick.state.transition.Transition#postRender(org.newdawn.slick.state.StateBasedGame, org.newdawn.slick.GameContainer, org.newdawn.slick.Graphics)
 */
public void postRender(StateBasedGame game, GameContainer container, Graphics g) throws SlickException {
	MaskUtil.resetMask();
}