Question

I am writing a program that shows a image moving across the screen, however for the assignment I must use the drawImage method. I create a new Image called turtle, and then draw the Image at the one point, then I draw it again at a later point, however, the first drawn Image is still visible, how can I hide/make this disappear. I am new to Java so please explain this as simply as possible.

Thanks!

Here is a sample of my code:

import java.awt.*;
import java.applet.*;

public class Race extends Applet {

         Image tortoise;

   public void init() {
           setSize(1275,1000);
           tortoise = getImage( getDocumentBase(), "resources/tortoise.png" );



   }

   public void paint( Graphics g) {

           g.drawImage(turtle, 100, 100, this);
           g.drawImage(turtle, 200, 200, this); // Both images are shown.               

     }
  }

Answer 1

You will have to overwrite its previous position with the background before you redraw it. clearRect would be a good option for this.

g.drawImage(turtle, 100, 100, this);
try {
    Thread.sleep(5000);
} catch(InterruptedException e) {}

g.clearRect(100, 100, turtle.getWidth(null), turtle.getHeight(null));
g.drawImage(turtle, 200, 200, this);

If you are drawing more than the one image to the screen, you will have to redraw all images which overlap the area you clear, in the correct z order, to maintain the screen state.