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POJava, how to draw constantly changing graphics
 

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    <p>Have not done this before, so obviously I suck at it. Here 64 pixels around current mouse position get drawn little bigger on a form. Problem is, that it's 'kind of' to slow, and I have no idea where to start fixing.</p> <p>Besides that, I made a thread, that constantly calls update graphics when it's finished and a little fps like text, to show really how fast things are drawn.</p> <p>Image example: (Image is from letter 'a' in Eclipse)</p> <p><img src="https://i.stack.imgur.com/i0OQQ.png" alt="alt text"></p> <p>Code example :</p> <pre><code>@SuppressWarnings("serial") public static class AwtZoom extends Frame { private BufferedImage image; private long timeRef = new Date().getTime(); Robot robot = null; public AwtZoom() { super("Image zoom"); setLocation(new Point(640, 0)); setSize(400, 400); setVisible(true); final Ticker t = new Ticker(); this.image = (BufferedImage) (this.createImage(320, 330)); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { t.done(); dispose(); } }); try { robot = new Robot(); } catch (AWTException e) { e.printStackTrace(); } t.start(); } private class Ticker extends Thread { public boolean update = true; public void done() { update = false; } public void run() { try { while (update == true) { update(getGraphics()); // try { // Thread.sleep(200); // } catch (InterruptedException e) { // e.printStackTrace(); // return; // } } } catch (Exception e) { update=false; } } } public void update(Graphics g) { paint(g); } boolean isdone = true; public void paint(Graphics g) { if (isdone) { isdone=false; int step = 40; Point p = MouseInfo.getPointerInfo().getLocation(); Graphics2D gc = this.image.createGraphics(); try { for (int x = 0; x &lt; 8; x++) { for (int y = 0; y &lt; 8; y++) { gc.setColor(robot.getPixelColor(p.x - 4 + x, p.y - 4 + y)); gc.fillOval(x * step, y * step, step - 3, step - 3); gc.setColor(Color.GRAY); gc.drawOval(x * step, y * step, step - 3, step - 3); } } } catch (Exception e) { e.printStackTrace(); } gc.dispose(); isdone = true; iter++; } g.drawImage(image, 40, 45, this); g.setColor(Color.black); StringBuilder sb = new StringBuilder(); sb.append(iter) .append(" frames in ") .append((double) (new Date().getTime() - this.timeRef) / 1000) .append("s."); g.drawString(sb.toString(), 50, 375); } int iter = 0; } </code></pre> <p>Changes made: <br> * added "gc.dispose();"<br> * added "isdone", so redraw could not be called faster, then it should.<br> * added <a href="http://pastebin.com/huD9s6bq" rel="noreferrer">this link</a> to thrashgod source rewrite <br> * added <a href="http://pastebin.com/V8mDfUiV" rel="noreferrer">this link</a> to thrashgod source rewrite 2</p>
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    1. COwhy don't you only repaint when a mouse move event occurs?
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    2. COWhy are you invoking the garbage collector during `paint`?
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    3. COReally want to paint what is near the mouse, and want it to work where-ever the mouse is (as fast as it could, even if on a video). The problem I assume you found was, that paint event could also be called not by thread t. I think, it was not a problem, but fixed it with adding "isdone" anyhow.
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