Simple Problem
I am trying to draw some objects in an applet, instead of retaining the old objects, it removes the earlier ones & draws the new ones, can anyone suggest me a method by which I can retain the old images in the applet. I am attaching a simple java applet.
Sample Code :
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*;
public class appl1 extends Applet
{
int top,left,x1;
public void init()
{
top = 100;
left = 200;
repaint();
left = 300;
repaint();
left = 400;
repaint();
}
public void paint(Graphics g)
{
update(g);
}
public void update(Graphics g)
{
g.drawRect(200,100,300,200);
g.drawRect(left,top,100,100);
}
}
[831 byte] By [
rahul420a] at [2007-9-27 9:56:25]
Hi Rahul420,
In your code, the method repaint() did not make any change when I commented. See the link I have given down to the reason.
public void init()
{
top = 100;
left = 200;
//repaint();
left = 300;
//repaint();
left = 400;
//repaint();
}
The values in 'left' keep changing which does not give purpose in your program. Finally, top = 100 and left is 400. With these values set, you are moving to,
public void paint(Graphics g)
{
update(g);
}
public void update(Graphics g)
{
g.drawRect(200,100,300,200);
g.drawRect(left,top,100,100);
}
Hence you are getting the result.
Now, tell what you wish to do. If you have doubt, please put more explanations to your question.
I would also suggest you to read the following.
http://java.sun.com/docs/books/tutorial/applet/index.html
http://java.sun.com/docs/books/tutorial/essential/threads/lifecycle.html
Hope this helps you,
Rajesh
