pinballpanel1.java

一些JAVA的小程序

import java.awt.event.*;
import java.util.Vector;
import javax.swing.*;
import java.awt.*;

public class PinBallPanel extends JPanel {
  private Vector balls;   //A vector to hold balls
  private PinBallFire fireButton = new PinBallFire(new Point(PinBallGame.FrameWidth-40, PinBallGame.FrameHeight-70));

  public PinBallPanel(){
    balls = new Vector();
    addMouseListener(new MouseKeeper());
  }

  private class MouseKeeper extends MouseAdapter{
    public void mousePressed(MouseEvent e) {
	//locate position of mouse cursor when moused clicked
      int x = e.getX();
      int y = e.getY();
	//if mouse clicked within firing region, create new
	//ball and thread, and start thread
      if (fireButton.includes(x, y)) balls.addElement(fireButton.fire(x, y));
    }
  }

  public void run() {
    while (true) {
      moveBalls();
      repaint();
      try {
        Thread.sleep(10);
      } catch(InterruptedException e) {System.exit(0);}
    }
  }

  private void moveBalls() {
    for (int i = 0; i < balls.size(); i++) {
      Ball theBall = (Ball) balls.elementAt(i);
      if (theBall.y() < PinBallGame.FrameHeight)
        theBall.move();
    }
  }

  public void paintComponent(Graphics g) {
    super.paintComponent(g); //clear window
    fireButton.paint(g);
    for (int i = 0; i < balls.size(); i++) {
      Ball aBall = (Ball) balls.elementAt(i);
      aBall.paint(g);
    }
  }
}