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POStop flickering in swing when i repaint too much
 

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  1. POStop flickering in swing when i repaint too much
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    <p>I am making an RPG with a tilemap. To generate the tilemap i loop through a 2 dimensional array but that means that when I repaint I have to do that each time. If I repaint too much the screen flickers how could I stop this.</p> <pre><code>package sexyCyborgFromAnOtherDimension; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Timer; import java.util.TimerTask; import javax.swing.JPanel; @SuppressWarnings("serial") public class Game extends JPanel { KeyLis listener; int mapX = 20; int mapY = 20; boolean up = false; boolean down = false; boolean right = false; boolean left = false; String[][] map; public Game() { super(); try { map = load("/maps/map1.txt"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } listener = new KeyLis(); this.setFocusable(true); this.requestFocus(); this.addKeyListener(listener); Timer timer = new Timer(); TimerTask task = new TimerTask() { @Override public void run() { if(up) { mapY++; repaint(); } if(down) { mapY--; repaint(); } if(right) { mapX--; repaint(); } if(left) { mapX++; repaint(); } } }; timer.scheduleAtFixedRate(task, 0, 10); } public void paint(Graphics g) { super.paintComponent(g); setDoubleBuffered(true); Graphics2D g2 = (Graphics2D)g; g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); for (int x = 0; x &lt; map.length; x++) { for (int y = 0; y &lt; map[x].length; y++) { switch(map[x][y]) { case "0": g.setColor(Color.GREEN); break; case "1": g.setColor(Color.GRAY); break; } g.fillRect(y*20+mapX, x*20+mapY, 20, 20); } } g.setColor(Color.BLACK); g.fillRect(400, 400, 20, 20); } String[][] load(String file) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream(file))); int lines = 1; int length = br.readLine().split(" ").length; while (br.readLine() != null) lines++; br.close(); BufferedReader br1 = new BufferedReader(new InputStreamReader(getClass().getResourceAsStream(file))); String[][] map = new String[lines][length]; for (int i = 0; i &lt; lines; i++) { String line = br1.readLine(); String[] parts = line.split(" "); for (int y = 0; y &lt; length; y++) { map[i][y] = parts[y]; } } br1.close(); return map; } private class KeyLis extends KeyAdapter { @Override public void keyPressed(KeyEvent e) { switch (e.getKeyCode()) { case KeyEvent.VK_UP: up = true; break; case KeyEvent.VK_DOWN: down = true; break; case KeyEvent.VK_LEFT: left = true; break; case KeyEvent.VK_RIGHT: right = true; break; } } @Override public void keyReleased(KeyEvent e) { switch (e.getKeyCode()) { case KeyEvent.VK_UP: up = false; break; case KeyEvent.VK_DOWN: down = false; break; case KeyEvent.VK_LEFT: left = false; break; case KeyEvent.VK_RIGHT: right = false; break; } } } } </code></pre> <p>Thank you for your help</p> <h2>Edit</h2> <p>Using <code>javax.swing.Timer</code> removes all flickering even with a 10 ms delay.</p>
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    1. CO+1 for your package name.
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    2. CO@Qwerky indeed nice - but not complying to java naming conventions <g>
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    3. CO@kleopatra Ok i will change it to com.sexyCyborgFromAnOtherDimension.
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