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POGlitch drawing on JComponent
 

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  1. POGlitch drawing on JComponent
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    <p>I'm having this weird kind of glitch with drawing on an JComponent. What happens is that whenever i drag the JFrame window outside the bounds of my monitor, the drawing accelerates and draws faster than it should. I'm guessing it has to do something with swing management, seems like drawing stops once the Jframe is offscreen and resumes in a burst kind of way after being set inside the bounds of the monitor screen.</p> <p>Here's my code:</p> <pre><code>package javagame; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import javax.swing.JComponent; /** * * */ public class Screen extends JComponent implements Runnable{ // paintbrush for drawing. //private Graphics internalg; private boolean keepDrawing = true; public Screen() { super(); startDrawing(); } /// Draw methods @Override protected void paintComponent(Graphics g) { super.paintComponent(g); //internalg = g; //Draw //System.out.println("painted"); drawSomething(g); } @Override public void run() { //Draw until manually stopped while(keepDrawing){ repaint(); try { Thread.sleep(100); } catch (InterruptedException ex) { } } } /** * Fire off thread. */ private void startDrawing() { Thread t = new Thread(this); //thread ends when JFrame is closed. t.setDaemon(true); t.start(); } /// Draw Logic /// /// Images int d = 2; public void drawSomething( Graphics internalg ) { if (isValid()){ internalg.setColor(Color.BLACK); internalg.fillRect(0, 0, getWidth(), getHeight());//clear bg internalg.setFont( new Font(Font.DIALOG, Font.BOLD, 15) ); internalg.setColor( Color.GREEN ); internalg.drawOval( (getWidth()/2)-(d/2) , (getHeight()/2)-(d/25), d, d); d++; } } /// Images } </code></pre>
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    1. USAndrew Thompson
    1. USEdQ3
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      1. VTUpMod
    1. COI, personally, would avoid the use of `Thread`s to perform animation (unless you have a particularly complex model that might take a variable amount of time to update) and rely on `javax.swing.Timer` instead
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      1. USMadProgrammer
    2. CODitto on @MadProgrammer's advice. Also you shouldn't have any program logic within your drawing code, even something as seemingly innocuous as `d++`. You do not have full control over when or if drawing will take place.
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      1. POGlitch drawing on JComponent
      1. USHovercraft Full Of Eels
    3. COI'm not seeing your particular issue under Java 7/Windows 7. It is possible that you might getter a better refresh under some circumstances as the required area to be updated is smaller, but I don't see it...
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      1. POGlitch drawing on JComponent
      1. USMadProgrammer
 

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