// Sprite class
//
// Sprites are objects which can be displayed
//

import java.awt.*;
import java.applet.*;

/////////////////////////////////////////////////////////////////
abstract class Sprite {
  protected boolean visible;           // is sprite visible
  protected boolean active;            // is sprite updatable

  // abstract methods:
  abstract void paint (Graphics g);
  abstract void update();

  // accessor methods:
  public boolean isVisible() {
    return visible;
  }

  public void setVisible(boolean b) {
    visible = b;
  }

  public boolean isActive() {
    return active;
  }

  public void setActive(boolean b) {
    active = b;
  }

  // suspend the sprite
  public void suspend() {
    setVisible(false);
    setActive(false);
  }

  // restore the sprite
  public void restore() {
    setVisible(true);
    setActive(true);
  }

}


abstract class Sprite2D extends Sprite {

  protected int locx;   
  protected int locy;

  Color color;
  boolean fill; 

  public boolean getFill() {
    return fill;
  }

  public void setFill(boolean b) {
    fill = b;
  }

  public void setColor(Color c) {
    color = c;
  }

  public Color getColor() {
    return color;
  }


}
 
 
 /////////////////////////////////////////////////////////////////
 class RectSprite extends Sprite2D {
 
   protected int width, height;    // dimensions of rectangle
 
   
   public RectSprite(int x,int y,int w,int h,Color c) {
     locx = x;
     locy = y;
     width = w;
     height = h;
     color = c;
     fill = false;                 // default: don't fill
     restore();                    // restore the sprite
   }
 
   // provide implementation of abstract methods:
 
   public void update() {
    
     // does nothing
 
   }
 
 
   // check if sprite's visible before painting
   public void paint(Graphics g) {
     if (visible) {
       g.setColor(color);
 
       if (fill) {
 	g.fillRect(locx,locy,width,height);
       }
 
       else {
 	g.drawRect(locx,locy,width,height);
       }
 
     }
 
   }
 
 }
   
 // Moveable interface. Note that the declarations public 
 // and abstract are optional. All methods specified in an
 // interface are automatically public and abstract!
 
 interface Moveable {
   public abstract void setPosition(int c, int d);
   public abstract void setVelocity(int x, int y);
   public abstract void updatePosition();
 }