//BouncingMouse.java
//click on ball kills it

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class BouncingMouse extends JApplet implements ActionListener {

    JLabel infoLabel, sizeLabel, moveLabel, animationDelayLabel;
    JTextField sizeTextField, movesizeTextField, animationDelayTextField;
    JPanel controlPanel;
    int size, movesize;
    int x, y, dir;
    Color circleColor;
    int hits;
    //boolean mouseHit;
    int animationDelay;        // millisecond delay
    Timer animationTimer;     // Timer drives animation
    
   public void init() {

	Container container = getContentPane();  
	container.setLayout( new BorderLayout() ); 

	controlPanel = new JPanel();
	controlPanel.setLayout(new FlowLayout());
	controlPanel.setBackground(Color.MAGENTA);
	controlPanel.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.RAISED));
	container.add(controlPanel,BorderLayout.NORTH);

	infoLabel = new JLabel( "Click the circle.     " );
	controlPanel.add( infoLabel );

	sizeLabel = new JLabel( "Size of circle" );
	controlPanel.add( sizeLabel );
	sizeTextField = new JTextField("50",3);
	size = Integer.parseInt(sizeTextField.getText());
	sizeTextField.setBackground(Color.CYAN);
	sizeTextField.addActionListener( this );
	controlPanel.add( sizeTextField );

	moveLabel = new JLabel( "Size of move" );
	controlPanel.add( moveLabel );
	movesizeTextField = new JTextField("10",3);
	movesize = Integer.parseInt(movesizeTextField.getText());
	movesizeTextField.setBackground(Color.CYAN);
	movesizeTextField.addActionListener(this );
	controlPanel.add( movesizeTextField );

	animationDelayLabel = new JLabel( "Frame rate in ms" );
	controlPanel.add( animationDelayLabel );
	animationDelayTextField = new JTextField("30",3);
	animationDelay = Integer.parseInt(animationDelayTextField.getText());
	animationDelayTextField.setBackground(Color.CYAN);
	animationDelayTextField.addActionListener( this );
	controlPanel.add( animationDelayTextField );
	

	x=(int)(Math.random()*getWidth());  //random starting 
	y=(int)(Math.random()*getHeight());
	dir=(int)(Math.random()*4);   //random diagonal direction:
        	//0 is NE, 1 is SE, 2 is SW, 3 is NW
	circleColor = new Color((int)(Math.random()*256),
				(int)(Math.random()*256),
				(int)(Math.random()*256));

	//incantation that responds to mouse click events:
	addMouseListener(
	    //anonymous inner class overrides mouseClicked.
	    //creates a $1 class file which must be uploaded to web site
	    new MouseAdapter() {
		public void mouseClicked( MouseEvent event) {
		    int mouseX = event.getX(); //gets X coord of mouse click event
		    int mouseY = event.getY();
		    if (Math.abs(x-mouseX)<=size/2 &&
			Math.abs(y-mouseY)<=size/2) {    //is inside circle
			hits++;
			showStatus("hits="+hits+"  ("+mouseX+","+mouseY+")");
			//generate new circle
			x=(int)(Math.random()*getWidth());  //random starting 
			y=(int)(Math.random()*getHeight());
			dir=(int)(Math.random()*4);   //random diagonal direction:
			circleColor = new Color((int)(Math.random()*256),
						(int)(Math.random()*256),
						(int)(Math.random()*256));
			//mouseHit = true;
			repaint();   //will invoke paint
		    }
		    else
			showStatus("hits="+hits+"  ("+mouseX+","+mouseY+")");
		}
	    }
	);

  	startAnimation();  //begin animation
   }
	

    //will be called when mouse clicks on ball
    //and each time timer goes off
    public void paint (Graphics g) {
		
	super.paint(g);    //clears entire screen
	//g.setColor( Color.WHITE );      //problem when new x,y when mouse click...???
	//g.fillOval(x-size/2,y-size/2,size,size);  //erase current circle
	
	    if (dir == 0) {    //moving NE
		x = x + movesize;
		y = y - movesize;				
		if (y-size/2 <= 0)   //hit top,
		    dir = 1;  //change to SE.
		else if (x+size/2 >= getWidth())  //hit right,
		    dir = 3;               //change to NW
	    }
	    else if (dir == 1) {
		x = x + movesize;
		y = y + movesize;				
		if (x+size/2 >= getWidth())
		    dir = 2;
		else if (y+size/2 >= getHeight())
		    dir = 0;
	    }
	    else if (dir == 2) {
		x = x - movesize;
		y = y + movesize;				
		if (x-size/2 <= 0)
		    dir = 1;
		else if (y+size/2 >= getHeight())
		    dir = 3;
	    }
	    else if (dir == 3) {
		x = x - movesize;
		y = y - movesize;				
		if (y-size/2 <= 0)
		    dir = 2;
		else if (x-size/2 <= 0)
		    dir = 0;
	    }
	    
	    /*
	else {    //paint called because of mouse click inside ball
	    mouseHit = false;   //turn off hit flag
	    //generate new circle
	    x=(int)(Math.random()*getWidth());  //random starting 
	    y=(int)(Math.random()*getHeight());
	    dir=(int)(Math.random()*4);   //random diagonal direction:

	}
	    */

	g.setColor( circleColor );
	g.fillOval(x-size/2,y-size/2,size,size);
    }


    //** Generic animation stuff:  use this as is for any animation.
    
    // respond to Timer's event and textfield events
    public void actionPerformed( ActionEvent event ) {
	if ( event.getSource() == animationTimer ) {
	    repaint();
	}
	else if ( event.getSource() == sizeTextField ) {
	    size = Integer.parseInt(sizeTextField.getText());
	    repaint();    
	}
	else if ( event.getSource() == movesizeTextField ) {
	    movesize = Integer.parseInt(movesizeTextField.getText());
	    repaint();    
	}
	else if ( event.getSource() == animationDelayTextField ) {
	    animationDelay = Integer.parseInt(animationDelayTextField.getText());
	    stopAnimation();
	    startAnimation();
	    repaint();    
	}
    }
    
    // start or restart animation
    public void startAnimation() {
	//	if ( animationTimer == null ) {
	    animationTimer = new Timer( animationDelay, this );
	    animationTimer.start();
	    /*
	}
	else // continue from last image displayed
	    if ( ! animationTimer.isRunning() )
		animationTimer.restart();
	    */
    }
    
    // stop animation timer
    public void stopAnimation() {
	animationTimer.stop();
    }
}