Java - Animacion cañon

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Polygon;

import java.awt.RenderingHints;

import java.awt.geom.AffineTransform;

import java.awt.geom.Rectangle2D;

import java.util.ArrayList;

import java.util.List;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.swing.JFrame;

/**

 *

 * @author andreas

 */

public class SimulaTiro extends JFrame {

    private int x1 = 0;

    private int y1 = 0;

    private double theta = 45;

    class Point {

        private int x;

        private int y;

        public Point(int x, int y) {

            this.x = x;

            this.y = y;

        }

        public int getX() {

            return x;

        }

        public void setX(int x) {

            this.x = x;

        }

        public int getY() {

            return y;

        }

        public void setY(int y) {

            this.y = y;

        }

    }

    private List<Point> points = new ArrayList<Point>();

    class SimulaTiroThread extends Thread {

        public void run() {

        double gravity = 9.81;

        double v0 = 60;

        double sinTheta = Math.sin(Math.toRadians(theta));

        double cosTheta = Math.cos(Math.toRadians(theta));

        double t = 2 * v0 * sinTheta / gravity;

        double deltaT = t / 1000;

        double cnt = 0;

        while (cnt < t) {

            double x = v0 * cosTheta * cnt;

            double y = v0 * sinTheta * cnt - .5 * gravity * cnt * cnt;

            points.add(new Point(15 + (int) x, 415 - (int) y));

            cnt += deltaT;

        }

        }

    }

    public SimulaTiro() {

        try {

            SimulaTiroThread simulaTiroThread = new SimulaTiroThread();

            simulaTiroThread.start();

            simulaTiroThread.join();

            setSize(800, 450);

            setLocation(100, 100);

            setVisible(true);

            this.setTitle("Simulacion cañon");

            this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        } catch (InterruptedException ex) {

            Logger.getLogger(SimulaTiro.class.getName()).log(Level.SEVERE, null, ex);

        }

    }

    public void paint(Graphics g) {

        Graphics2D g2 = (Graphics2D) g;

        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

                RenderingHints.VALUE_ANTIALIAS_ON);

        Dimension d = this.getSize();

        super.paintComponents(g);

        AffineTransform transform = new AffineTransform();

        transform.rotate(Math.toRadians(-theta), 15, 415);

        AffineTransform old = g2.getTransform();

        g2.transform(transform);

        g2.setColor(Color.BLACK);

        g2.fillOval(x1, 400, 31, 31);

        Polygon poly = new Polygon();

        poly.addPoint(15, 400);

        poly.addPoint(60, 410);

        poly.addPoint(60, 420);

        poly.addPoint(15, 431);

        g2.setColor(Color.BLACK);

        g2.fillPolygon(poly);

        g2.setColor(Color.RED);

        g2.drawLine(15, 415, 100, 415);

        g2.setTransform(old);

        g2.setColor(Color.GRAY);

        g2.fill(new Rectangle2D.Double(0, 431, 31, 10));

        g2.setColor(Color.WHITE);

        g2.drawLine(15, 0, 15, (int) d.getHeight());

        g2.drawLine(0, 415, (int) d.getWidth(), 415);

        g2.setColor(Color.BLUE);

        for(Point p : points) {

            g2.drawOval(p.getX(), p.getY(), 1, 1);

        }

    }

    public static void main(String argv[]) {

        SimulaTiro c = new SimulaTiro();

    }

}