/**
 * The test class ThreadMoveBallInterface.
 *
 * @author Gerald Gordon
 * @version May 28, 2007
 */
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

public class ThreadMoveInterface extends JFrame implements ActionListener,Runnable
{
    private int x,y;
    private int direction_x,direction_y;
    private JButton move;
    private FilledOval redOval;
    Thread t;
    
    private final int FRAME_WIDTH = 300;
    private final int FRAME_HEIGHT = 300;
    private final int FRAME_X_AXIS =100;
    private final int FRAME_Y_AXIS =100;
    
       public ThreadMoveInterface()
    {
        setSize(FRAME_WIDTH,FRAME_HEIGHT);
        setLocation(FRAME_X_AXIS,FRAME_Y_AXIS);
        setTitle("Move Ball");
        setLayout(null);
               
        move = new JButton("Move");
        move.setBounds(100,60,100,30);
        add(move);
               
        move.addActionListener(this);
         
    }

    public void actionPerformed(ActionEvent e)
    {
         direction_x = 1;direction_y = 1;  
         x = 20; y = 50;
         redOval = new FilledOval(x,y,20,20,0);
         redOval.setForeground(Color.red);
         this.add(redOval);
    
         t = new Thread(this);
         t.start();      
    }
    
    public void run()
    {
        int dx = 15,dy = 15;
        while(true)
        {
          
                x += dx * direction_x;              
                y += dy * direction_y;
           
            if (x >=FRAME_WIDTH -(redOval.getWidth() + dx) || x <= 0)
               direction_x *= -1;
    
            if (y >=FRAME_HEIGHT - (redOval.getHeight()+((double)3/2)*dy) || y <= 0)
               direction_y *= -1;
         
                redOval.setBounds(x,y,20,20);
                try
                {
                    Thread.sleep(100);
                }
                catch(InterruptedException e)
                {
                    e.printStackTrace();
                }
           
        }
    }
 }