OK i''m just trying to create a gameloop with double buffering, which will load a 640x480 image as background. which i have done. however, it flashes periodically and when you move the mouse about. i think paint is drawing to the screen without copying from the buffer but i dont know how to fix it. any help anyone? ps when i have sorted this out i will switch it to use proper buffers and that Game.java ________________________________________________________ package game; import java.awt.*; import java.awt.event.*; import java.awt.Toolkit; public class Game implements Runnable { private Image backBuffer, background; private Graphics offscr; private int width, height = 0; private long time, lastFrameTime = 0; private Thread runThread; private Frame drawFrame; /**Game state */ boolean gameRunning = true; public Game() { // this is where it looks for the 640x480 gif file... background = Toolkit.getDefaultToolkit().getImage("c:/game/back.gif"); if (background == null) {System.out.println("isNull");} drawFrame = new Frame(); drawFrame.setSize(640,480); width = drawFrame.getSize().width; height = drawFrame.getSize().height; drawFrame.setVisible(true); /**Set backbuffer*/ backBuffer = drawFrame.createImage(width, height); offscr = backBuffer.getGraphics(); runThread = new Thread(this); runThread.start(); } public void paint(Graphics g) { g.drawImage(backBuffer, 0, 0, this.drawFrame); } public void run() { System.out.println("entering main loop..."); while (runThread != null) { /**Check time and update*/ lastFrameTime = System.currentTimeMillis() - time; time = System.currentTimeMillis(); //get Input //update game world //draw to buffer drawObjects(); drawFrame.getGraphics().drawImage(backBuffer, 0, 0, this.drawFrame); //draw to screen drawFrame.repaint(); //limit fps?? try { runThread.sleep(5); } catch (InterruptedException e) { ; } } } public void drawObjects(){ //load background offscr.drawRect(10,10,10,10); offscr.drawImage(background, 0,0,Color.black,this.drawFrame); offscr.drawRect(30,10,10,10); } public void update(Graphics g) { } public static void main(String[] args){ Game game = new Game(); } }

whats the difference between update and repaint and paint?
what gets called when?

1) Your drawing logic is a bit of a mess, you shouldn''t be calling repaint for a start and you''re not double buffered efficiently either. Grab this file for some sample code. It''s a test program i did for double buffering/active rendering amongst other things and should give you a few pointers.

2) Check out javagaming.org forums as well, theres tons of info there...

thanks everyone you have been a great help. OrangyTang your code is exactly what i was trying to make. Think i may still chop your ups though so i see how it all works. ANd cheers for the clarification on whats going on with the paint/repaint

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