How to make object stop moving with mouse click

[mackavelirip]

Hi my assignment is to make a checkers board with 4 squares and two checkers moving in opposite directions. I have to then make it so the checkers stop moving when you press and hold the mouse then they start moving again when you release it. I have the board and checkers set up and moving, im just not sure how to make them stop with a mouse click. I know your supposed to use the mouse listener but im not sure how to write the code that goes in mouse pressed and mouse released(ie how to make the checker stop moving.. If someone could steer me in the right direction that would be great. My thinking would be to make it stop repainting when the mouse clicks then start repainting when the mouse is released but im not too sure on how to do that. Heres my code thus far.

import java.awt.Graphics;
import java.awt.Color;
import java.awt.Image;

public class Checkers extends java.applet.Applet implements Runnable, MouseListener {

  Thread runner;
  int ypos, xpos;
  Image offscreenImg;
  Graphics offscreenG;
  int num = 1;
  

  public void init() 
{
    offscreenImg = createImage(this.size().width, this.size().height);
    offscreenG = offscreenImg.getGraphics();
  }
  
 
  public void start() {
    if (runner == null); {
      runner = new Thread(this);
      runner.start();
    }
  }

  public void stop() {
    if (runner != null) {
      runner.stop();
      runner = null;
    }
  }

  public void run() {
  
  	while(num ==1)
	{
    while (ypos <= 105)
	 {
      for (ypos = 5; ypos <= 105; ypos+=5) 
		{
        repaint();
        try { Thread.sleep(100); }
        catch (InterruptedException e) { }
      }

    }

	
	 while(ypos >= 5)
	 {
	 	for (ypos = 105; ypos >= 5; ypos-=5) 
		{
        repaint();
        try { Thread.sleep(100); }
        catch (InterruptedException e) { }
		 }
	  }
	  

	 
	 }
  }


  public void update(Graphics g) {
     paint(g);
  }


  public void paint(Graphics g) {
    // Draw background onto the buffer area
    offscreenG.setColor(Color.black);
    offscreenG.fillRect(0,0,100,100);
	 offscreenG.setColor(Color.black);
	 offscreenG.fillRect(100,100,100,100);
    offscreenG.setColor(Color.gray);
    offscreenG.fillRect(100,0,100,100);
	 offscreenG.setColor(Color.gray);
	 offscreenG.fillRect(0,100,100,100);
	 
    // Draw checker
    offscreenG.setColor(Color.red);
    offscreenG.fillOval(ypos,5,90,90);
	 offscreenG.setColor(Color.blue);
	 offscreenG.fillOval(105,ypos,90,90);
  
    // Now, transfer the entire buffer onto the screen
    g.drawImage(offscreenImg,0,0,this);
  }
  public void destroy() {
     offscreenG.dispose();
  }
}

[erversteeg]

This may not be the best way to do it, but what you could do is set up a MouseListener on your panel. In the mousePressed method you can "pause" the thread that your graphics are working over. Then in the mouseReleased just resume the thread.

gamePanel.addMouseListener(new MouseListener(){

			@Override
			public void mouseClicked(MouseEvent arg0) {
				// TODO Auto-generated method stub
				
			}

			@Override
			public void mouseEntered(MouseEvent arg0) {
				// TODO Auto-generated method stub
				
			}

			@Override
			public void mouseExited(MouseEvent arg0) {
				// TODO Auto-generated method stub
				
			}

			@Override
			public void mousePressed(MouseEvent arg0) {
				// Pause thread.
				
			}

			@Override
			public void mouseReleased(MouseEvent arg0) {
				// Resume thread.
				
			}
			
		});

[mackavelirip]

Thank you for you help. I tried what you said and now when I click it stops but when I release it doesnt start moving again.

Heres my code.

import java.awt.Graphics;
import java.awt.Color;
import java.awt.Image;
import java.awt.event.*;


public class Checkers extends java.applet.Applet implements Runnable, MouseListener {

  Thread runner;
  int xpos, ypos;
  Image offscreenImg;
  Graphics offscreenG;
  boolean pleaseWait = false;
  

  public void init() {
    offscreenImg = createImage(this.size().width, this.size().height);
    offscreenG = offscreenImg.getGraphics();
	 addMouseListener(this);

  }
  
    public void mouseMoved(MouseEvent e) {}
    public void mouseClicked(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
	 
	 public void mousePressed(MouseEvent e) 
	 {
	 	while(true)
		{
		pleaseWait = true;
		}
	 
	 }
	 
	 public void mouseReleased(MouseEvent e)
	 {
	   pleaseWait = false;
	 } 

	
 
  public void start()
   {
      if (runner == null);
	   {
       runner = new Thread(this);
       runner.start();
		 
      }
  }

  public void stop()
   {
       if (runner != null)
	   {
       runner.stop();
       runner = null;
      }
  }

  public void run() {
  
  while(pleaseWait == false)
  {
  	 //Top checker starting position
  	 xpos = 5;
	 //Bottom Checker starting position
	 ypos = 105;
	 
	 //infinit loop to keep checkers moving
	 while(true)
	 {
	 //moves checkers the from one side to the other
              while (xpos < 105 && ypos > 5)
	 {
	 	xpos += 5;
		ypos -= 5;
		
                 repaint();
                 try { Thread.sleep(100); }
                 catch (InterruptedException e) { }
		 
	}
		//moves checkers from the other side
	while(xpos > 5 && ypos < 105)
	 {
	      xpos -= 5;
	      ypos += 5;
			
	      repaint();
                   try { Thread.sleep(100); }
                   catch (InterruptedException e) { }
	}
	}
	}

	 
 }
  


  public void update(Graphics g) {
     paint(g);
  }


  public void paint(Graphics g) {
    // Draw background onto the buffer area
    offscreenG.setColor(Color.black);
    offscreenG.fillRect(0,0,100,100);
	 offscreenG.setColor(Color.black);
	 offscreenG.fillRect(100,100,100,100);
    offscreenG.setColor(Color.gray);
    offscreenG.fillRect(100,0,100,100);
	 offscreenG.setColor(Color.gray);
	 offscreenG.fillRect(0,100,100,100);
	 
    // Draw checker
    offscreenG.setColor(Color.red);
    offscreenG.fillOval(xpos,5,90,90);
	 offscreenG.setColor(Color.blue);
	 offscreenG.fillOval(ypos,105,90,90);
  
    // Now, transfer the entire buffer onto the screen
    g.drawImage(offscreenImg,0,0,this);
  }
  public void destroy() {
     offscreenG.dispose();
  }
}

[Fubarable]

You need to use a background thread for this so you don't call Thread.sleep on the GUI's thread putting the GUI to sleep, either that or use a timer of some sorts. I've used a Swing Timer for Swing apps, but I'm not sure if it would work for AWT apps -- don't know.