//
// FILE:     MultiBallWorldFrame.java
// AUTHOR:   Eugene Wallingford 
// DATE:     2012/10/11
// COMMENT:  a frame with a bunch of moving balls and a button
//           that causes the balls to move
//
// MODIFIED: 2012/10/28 -- Eugene Wallingford
// CHANGE:   modified to demonstrate generic ball decorator
//           added factory methods for different kinds of ball
//

import java.awt.Button;
import java.awt.Frame;
import java.awt.Graphics;

public class MultiBallWorldFrame extends CloseableFrame
{
  private static final int FrameWidth  =  600;
  private static final int FrameHeight =  400;
  private static final int Iterations  = 2000;

  private Ball[] ball;
  private int    counter;

  public MultiBallWorldFrame( int numberOfBalls )
  {
    super();
    
    setSize ( FrameWidth, FrameHeight );
    setTitle( "Multi Ball World" );
    
    ball = new Ball[numberOfBalls];
    for (int i = 0; i < numberOfBalls; i++)
    {
      int dx = (int) (20 * Math.random() );
      int dy = (int) (10 * Math.random() );
      // ball[i] = makeDeceleratingBall( dx, dy );     // case 1
      // ball[i] = makeExpandingBall( dx, dy );        // case 2
      ball[i] = makeComboBall( dx, dy );               // case 3
    }

    counter = 0;
  }

  public void paint( Graphics g )
  {
    for (int i = 0; i < ball.length; i++)
    {
      ball[i].paint( g );
      ball[i].move();
    }
    counter++;
    
    if ( counter >= Iterations )
      System.exit( 0 );
    repaint();
  }

  protected Ball makeExpandingBall( int dx, int dy )
  {
    return new ExpandingBall(
               new BoundedBall( 100, 100, 10, dx, dy, this ) );
  }

  protected Ball makeDeceleratingBall( int dx, int dy )
  {
    return new DeceleratingBall(
               new BoundedBall( 100, 100, 10, dx, dy, this ) );
  }

  protected Ball makeComboBall( int dx, int dy )
  {
    return new ExpandingBall(
               new DeceleratingBall(
                   new BoundedBall(100, 100, 10, dx, dy, this )));
  }
}