scene.java

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     import java.awt.*;
     import java.awt.geom.*;

     // 提供场景管理的框架类
     public abstract class Scene
     {
          // 场景的总体边界
          protected Rectangle2D bounds;

          // 场景中可见的部分;通常就是applet窗体的大小
          protected Rectangle2D viewable;

          // 用传入的边界和可见区域创建一个新的Scene对象
          public Scene(Rectangle2D v, Rectangle2D b)
          {
               setViewable(v);
               setBounds(b);
          }

          // 添加一个到场景中,使用Actor2D对象的子类应该覆盖这个方法
          public void add(Actor2D a)
          {

          }

          public final void setViewable(Rectangle2D r)
          {
               viewable = new Rectangle2D.Double(r.getX(), r.getY(), r.getWidth(), r.getHeight());  
          }

          public final Rectangle2D getViewable()
          {
               return viewable;
          }

          public final void setBounds(Rectangle2D r)
          {
               bounds   = new Rectangle2D.Double(r.getX(), r.getY(), r.getWidth(), r.getHeight());  
          }

          public final Rectangle2D getBounds()
          {
               return bounds;
          }

          // 更新场景 
          public abstract void update();

          // 在Graphics2D容器上绘制场景        
          public abstract void paint(Graphics2D g2d);

     }    // Scene