Bad effect when draw object moving fast

Question

Hi, i have a shooter game where a gun can shoot a bullet.
This bullet run fast so i move it whit X+=dx (dx is distance in pixel)
When the bullet run too fast i ahve a bad effect, ot smootly.
How i can resolve?
Now my code is frame based i think, i use this:
delay =30;
Timer timer=new Timer(delay, new ActionListener(){
          public void actionPerformed(ActionEvent e){
                    processBulletPosition();
                    timer.setDelay(delay-delayed);
public void processBulletPosition(){
         bullet.process(new 2DVector(10,0)); //2DVector is simple object contain dx and dy increment.
         repaint();
//im use JPanel to paint, not canvas
protected void paintComponent(Graphics g) {
          super.paintComponent(g);
          Graphics2D g2=(Graphics2D)g;
                nanoTime=System.nanoTime();
                bullet.draw(g2);
                delayed=(System.nanoTime()-nanoTime)*1E-6; //make delayed in millisec
}bullet proces is like this:
public void process(2DVector vect){
          int dx=vect.dx;
          int dy=vect.dy;
          x+=dx;
          y+=dy;
}Animation is very smooty, but when a bullet or an other object run too fast and dx increment is too many pixel the effect is very bad, and not smooty.
I think i have same fps becouse i decrement delay time of a delayed time...
Can you help me?
Message was edited by:
blow

Answer 1

One problem is that I'm not sure how accurate Timer is.
A standard approach in this sort of animation is to measure the time since the last redraw and move each component based on the time difference, rather than trying to keep the redraws an exact time apart and moving the components fixed distances.
The distance/time approach reduces the effect of pauses in your rendering code caused by outside influences such as the garbage collector and other game logic such as spawning controllers etc. It won't eliminate pauses but it makes them much less noticable.