GD - DrawMove.java

package gd;

/**
 * Illustrates drawing and moving of DrawableAndMovable objects
 *
 * @author Peter Sestoft
 * @version 2007-11-05
 */

import java.awt.*;
import javax.swing.JFrame;

public class DrawMove extends JFrame {
  private MyCanvas canvas = new MyCanvas();
  private Drawable[] drawables;

  public DrawMove() {
    add(canvas);
    pack();
    setVisible(true);
  }

  public void drawThem(Drawable[] dms) {
    this.drawables = dms;
    canvas.repaint();
  }

  public void drawAndMoveThem(DrawableAndMovable[] dms) {
    this.drawables = dms;
    for (int i=0; i<500; i++) {
      canvas.repaint();
      try { Thread.sleep(50); } catch (InterruptedException exn) { };
      for (Movable m : dms) {
          m.move(3,2);
      }
    }
  }


  private class MyCanvas extends Canvas {
    public Dimension getPreferredSize() {
      return new Dimension(600, 400);
    }

    public void paint(Graphics g) {
      g.setColor(Color.RED);
      if (drawables != null) {
        for (Drawable d : drawables) {
          d.draw(g);
        }
      }
    }
  }
}