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Jorg hi
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 Posted: Sun Aug 08, 2010 10:16 am Post subject: [Java] Repaint is flickering |
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I'm drawing a rectangle to the window and I put a repaint event on a timer set to 1 and the rectangle flickers?
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justa_dude
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| Posted: Sun Aug 08, 2010 4:08 pm Post subject: |
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| Show us the code.
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Cheat Engine User
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atom0s
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| Posted: Sun Aug 08, 2010 7:48 pm Post subject: |
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This has been brought up a few times in the past week or so.
You are not drawing in sync with the other window, just tossing a drawing routine into a timer will not give you flicker free drawing. You need to sync your drawing with the applications refreshing. There are multiple ways of doing it, such as hooking the painting method of the target application and drawing your information afterward.
Also in the future, post more information, show code, or explain in more detail before you post. Saying 'it don't work' is not a suitable topic.
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Jorg hi
I post too much
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Location: Minnesota
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| Posted: Sun Aug 08, 2010 8:19 pm Post subject: |
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Yeah I know. I solved it though by calling update(this.getGraphics) instead of using the repaint().
| Code: |
public void update(Graphics g) {
Graphics offgc;
Image offscreen = null;
Rectangle box = g.getClipRect();
// create the offscreen buffer and associated Graphics
offscreen = createImage(box.width, box.height);
offgc = offscreen.getGraphics();
// clear the exposed area
offgc.setColor(getBackground());
offgc.fillRect(0, 0, box.width, box.height);
offgc.setColor(getForeground());
// do normal redraw
offgc.translate(-box.x, -box.y);
paint(offgc);
// transfer offscreen to window
g.drawImage(offscreen, box.x, box.y, this);
}
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Noz3001
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| Posted: Wed Aug 11, 2010 9:45 am Post subject: |
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In Java, you can create a BufferStrategy for double buffering animation. Something like this:
| Code: | BufferStrategy bufferStrategy = null;
Graphics2D g = null;
this.setIgnoreRepaint(true); // this = JFrame
try {
this.createBufferStrategy(2);
bufferStrategy = this.getBufferStrategy();
} catch (Exception e) {
e.printStackTrace();
} |
Then in animation loop:
| Code: |
g = (Graphics2D) bufferStrategy.getDrawGraphics();
// Do drawing with g.drawWhatever() and whatever else
g.dispose()
bufferStrategy.show(); |
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iPromise
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| Posted: Mon Aug 16, 2010 4:28 am Post subject: |
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| I don't code in Java, but the methods are the same. Draw on to a memory DC, then swap the memory DC to the applications DC. This is called the 'Double Buffering' technique, you can search it up and find some decent examples.
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