import javax.swing.*;						// J stuff
import java.awt.*;							// Color
import java.awt.event.*;					// Timer, KeyListener, ActionListener
import java.util.Random;					// we don't want to use java.util.* since that package has its own Timer class

public class BouncingBallWithWind
{
	public static void main(String[] args)
	{
		JFrame frame=new JFrame();
		frame.setSize(540,540);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		GraphicsPanel gp=new GraphicsPanel();
		gp.setFocusable(true);				// need to make the panel focusable for KeyListener
		frame.add(gp);
		frame.setVisible(true);
	}
	
	public static class GraphicsPanel extends JPanel implements KeyListener, ActionListener	// uses both Timer and keyboard input
	{
		private BouncingBall2 ball;					// We will have a single ball which bounces but we can also affect it with "wind" (keyboard input)
		private Random gen;							// just used in the instantiation of the BouncingBall class
		public GraphicsPanel()
		{
			gen=new Random();
			ball=new BouncingBall2(500,500,gen);				// instantiate the object
			addKeyListener(this);						// add a KeyListener requiring that we implement 3 methods
			Timer t=new Timer(10,this);					// create a Timer whose ActionListener will be this class
			t.start();									// start the Timer
		}
		
		public void actionPerformed(ActionEvent e)		// Timer generated an ActionEvent, move the ball
		{
			ball.move();
			repaint();									// and then redraw the Graphics object
		}
		
		public void keyTyped(KeyEvent e){}
		public void keyReleased(KeyEvent e){}
		public void keyPressed(KeyEvent e)				// if an arrow is pressed, we will move the ball slightly in the direction of the arrow
		{
			if(e.getKeyCode()==KeyEvent.VK_RIGHT) ball.move(5,0);		// the values passed to ball.move are the amount of pixels to move the
			else if(e.getKeyCode()==KeyEvent.VK_LEFT) ball.move(-5,0);	// ball in the x and y direction, for instance (5,0) moves it a little to the right
			else if(e.getKeyCode()==KeyEvent.VK_UP) ball.move(0,-5);
			else if(e.getKeyCode()==KeyEvent.VK_DOWN) ball.move(0,5);
			repaint();									// redraw the ball once we have moved it
		}
		
		
		public void paintComponent(Graphics g)
		{
			super.paintComponent(g);					// start with a new image
			g.setColor(Color.white);
			g.fillRect(0,0,540,540);					// fill the background as white
				ball.draw(g);							// have the ball draw itself
		}
	}
}