FRANK

Hi, the following code shows my image moving around the screen but I cannot seem to stop it from hitting the edge of the panel. Can anyone add to the end of the code... much appreciated

import javax.swing.JPanel;
import java.awt.Graphics;


class robotpanel extends JPanel

{

private robot ted;
private Thread robothread;


public robotpanel()
{
ted=new robot(this);
robothread = new Thread(ted);
robothread.start();
}


public void paintComponent(Graphics g)
{
super.paintComponent(g);
System.out.println(this.getWidth()+" " +this.getHeight());
g.fillRect(ted.getX(),ted.getY(),20,20);
}
}

^^^ I need to add the code at the end to stop "ted" hitting the edge. Please advise. Cheers

Marlek D

The way to solve this is to have a function that calls itself--lets say every millisecond--to check the value of a certain variable. For example your "ted" could have two variables, x, and y, initialized at (0,0) that you either add to or subtract from as "ted" moves left and right, up and down. While this is happening, the function that calls itself is checking the values of x and y. You tell this function to ignore any calls to move "ted" up/down left/right by assigning a maximum value of x and a maximum value of y. I did this in JavaScript so you should be able to do it in full fledged Java.