Ballistisk kurve i Java Swing

Java kode 

 package frozenlife;
 
 
 import java.text.*;
 import javax.swing.*;
 
 
 /**
  *
  * @author Jakob
  */
 public class Main {
 
     /**
      * @param args the command line arguments
      */
     public static void main(String[] args) {
 
         Ballistics panel = new Ballistics();
         JFrame window = new JFrame("Ballistics");
         window.add(panel);
         window.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
         window.setSize(500, 500);
         window.setVisible(true);
 
         for (double t=0; t<100000; t+=0.1)
         {
             double speed = 14, angle = 45;
             double speedX = speed * Math.cos(angle), speedY = speed * Math.sin(angle);
             double willHitIn = 2*speedY/9.82, xMax = 2*speedX * speedY / 9.82, yMax = Math.pow(speedY, 2) / (2 * 9.82);
             //DecimalFormat threeDigit = new DecimalFormat("#,##0.000");
             //System.out.println("Bolden rammer om: " + threeDigit.format(willHitIn)  + " sekunder");
             //System.out.println("Den kommer " + threeDigit.format(xMax) + " meter og når en højde på " + threeDigit.format(yMax));
             //System.out.println("Efter 1 sek. er den er den koordinater: " + threeDigit.format(speedX*t) + " og " + threeDigit.format(speedY*t - 0.5*9.82*Math.pow(t, 2)));
             int pointY = (int) Math.round(speedY*(t/100) - 0.5*9.82*Math.pow((t/100), 2));
             int pointX = (int) Math.round(speedX*(t/100));
             panel.setPoint(pointX, pointY);
             panel.repaint();  
             try { Thread.sleep(1); } catch (Exception e) {}
         }
     }
 
 }

Java kode 

 /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
 
 package frozenlife;
 import java.awt.*;
 import javax.swing.*;
 
 /**
  *
  * @author Jakob
  */
 public class Ballistics extends JPanel {
     private int x, y;
     public void paintComponent(Graphics g)
     {
         super.paintComponent(g);
         g.setColor(Color.GREEN);
         if(this.y < 0) this.y = 0;
         g.fillOval(this.x*5, this.y*5, 30, 30);
     }
 
     public void setPoint(int posX, int posY)
     {
         this.x = posX;
         this.y = posY;
     }
 }