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POHow can I prevent flashing?
 

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  1. POHow can I prevent flashing?
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    <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Racing extends JFrame { private static final long serialVersionUID = -198172151996959655L; //makes the screen size final int WIDTH = 900, HEIGHT = 650; //keeps track of player speed double plSpeed = .5; //numbers that represent direction final int UP = 0, RIGHT = 1, DOWN = 2, LEFT = 3, STOP = 5, START = 6; //keeps track of player direction int p1Direction = START; //makes player 1's car Rectangle p1 = new Rectangle ( 100, 325, 30, 30 ); Rectangle foreground = new Rectangle( 500, 500, 200, 200 ); //constructor public Racing() { //define defaults for the JFrame super ("Racing"); setSize( WIDTH, HEIGHT ); setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); setBackground(Color.BLACK); //start the inner class Move1 m1 = new Move1(); m1.start(); } //draws the cars and race track public void paint(Graphics g) { super.paint(g); //draw p1 g.setColor(Color.RED); g.fillRect(p1.x,p1.y,p1.width,p1.height); g.setColor(Color.GREEN); g.fillRect(foreground.x,foreground.y,foreground.width,foreground.height); } private class Move1 extends Thread implements KeyListener { public void run() { //makes the key listener "wake up" addKeyListener(this); //should be done in an infinite loop, so it repeats while (true) { //make try block, so it can exit if it errors try { //refresh screen repaint(); //makes car increase speed a bit if (plSpeed &lt;= 7) { plSpeed += .2; } //lets the car stop if (plSpeed==0) { p1Direction = STOP; } //moves player based on direction if (p1Direction==UP) { p1.y -= (int) plSpeed; } if (p1Direction==DOWN) { p1.y += (int) plSpeed; } if (p1Direction==LEFT) { p1.x -= (int) plSpeed; } if (p1Direction==RIGHT) { p1.x += (int) plSpeed; } if (p1Direction==STOP) { plSpeed = 0; } //delays refresh rate Thread.sleep(75); } catch(Exception e) { //if an error, exit break; } } } //have to input these (so it will compile) public void keyPressed(KeyEvent event) { try { //makes car increase speed a bit if (event.getKeyChar()=='w' || event.getKeyChar()=='a' || event.getKeyChar()=='s' || event.getKeyChar()=='d') { plSpeed += .2; repaint(); } } catch (Exception I) {} } public void keyReleased(KeyEvent event) {} //now, to be able to set the direction public void keyTyped(KeyEvent event) { if (plSpeed &gt; 0) { if (event.getKeyChar()=='a') { if (p1Direction==RIGHT) { p1Brake(); } else { if (p1Direction==LEFT) { } else { p1Direction = LEFT; } } } if (event.getKeyChar()=='s') { if (p1Direction==UP) { p1Brake(); } else { if (p1Direction==DOWN) { } else { p1Direction = DOWN; } } } if (event.getKeyChar()=='d') { if (p1Direction==LEFT) { p1Brake(); } else { if (p1Direction==RIGHT) { } else { p1Direction = RIGHT; } } } if (event.getKeyChar()=='w') { if (p1Direction==DOWN) { p1Brake(); } else { if (p1Direction==UP) { } else { p1Direction = UP; } } } if (event.getKeyChar()=='z') { p1Brake(); } } } public void p1Brake () { try { while (plSpeed != 0) { plSpeed -= .2; Thread.sleep(75); } } catch (Exception e) { plSpeed = 0; } } } //finally, to start the program public static void main(String[] args) { Racing frame = new Racing(); frame.setVisible( true ); frame.setLocationRelativeTo( null ); frame.setResizable( false ); } </code></pre> <p>}</p> <p>This is an SSCCE of my code. If I add super.paint(g); to the top of this, inside the class, then it gets all flashy. If I leave that out, then whenever you move the player, then it creates a line of where the player has been-without repainting. I need to know how to - and where to repaint. The closest I have gotten to my answer here here:</p> <p><a href="http://www.java-forums.org/awt-swing/37406-repaint-without-flashing.html" rel="nofollow noreferrer">http://www.java-forums.org/awt-swing/37406-repaint-without-flashing.html</a></p> <p>but they have an applet (which I have never dealt with before, and assuming it would be rather tricky to translate the code from applet to frames). Can anybody help me with this?</p> <p>Notes:</p> <p>I didn't know you could make a frame with awt, because I was happy and familiar with swing, so I didn't want to change. Sorry about that. As you can see, whatever i draw flashes, not just the player.</p> <p>Andrew, here's my screenshot: <img src="https://i.stack.imgur.com/sSfM2.png" alt="the game"></p> <p>Oh, and it doesn't register P2.</p>
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    1. COWhat happened to *"I'll make sure to do that next time."* from [this thread](http://stackoverflow.com/questions/8889977/how-do-i-set-an-image-in-a-rectangle). I don't see an SSCCE, only uncompilable code snippets where you cannot even tell if Swing or AWT is used. -1
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      1. POHow can I prevent flashing?
      1. USAndrew Thompson
    2. COSorry, I was a bit confused- and therefore misguided- on the definition of SSCCE. i'll be able to post one tomarrow.
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      1. USNick Catlin
    3. COThere, this demonstrates my problem.
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      1. USNick Catlin
 

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