playfield.java

awt图形界面的生成

import java.awt.*;
import java.util.*;

public class Playfield extends DoubleBufferedContainer
                               implements Runnable, 
                                          CollisionArena {
	private   boolean running = false;
	private   Thread  animationThread;
	private   CollisionDetector spriteDetector, edgeDetector;

	public Playfield() {
		edgeDetector   = new EdgeCollisionDetector(this);
		spriteDetector = new SpriteCollisionDetector(this);
		setLayout(new BulletinLayout());
	}
	public void spriteCollision(Sprite sprite, Sprite other) { }
	public void edgeCollision  (Sprite sprite, Orientation o){ }

	public void    stop   ()  { running = false;  }
	public boolean running()  { return running;   }

	public void start() {
		animationThread = new Thread(this);
		running = true;
		animationThread.start();
	}
	public void run() {
		while(running == true) {
			edgeDetector.detectCollisions  ();
			spriteDetector.detectCollisions();

			animateSprites();
			try { Thread.currentThread().sleep(50); }
			catch(Exception e) { e.printStackTrace(); }
		}
		animationThread = null;
	}
	public Vector getSprites() {
		int         ncomps = getComponentCount();
		Component   comp;
		Vector      vector = new Vector();

		for(int i=0; i < ncomps; ++i) {
			if((comp = getComponent(i)) instanceof Sprite)
				vector.addElement(comp);
		}
		return vector;
	}
	protected void animateSprites() {
		int         ncomps = getComponentCount();
		Component   comp;
	
		for(int i=0; i < ncomps; ++i) 
			if((comp = getComponent(i)) instanceof Sprite)
				((Sprite)comp).animate();
	}
}