Create collision of two rockets in java

Problem:

Create a GUI java-based application that animates the
collision of two rockets.

Output:

Solution:

//********************RocketsCollisionFrame.java***************/
import javax.swing.JFrame;

public class RocketsCollisionFrame {

 
 public static void main(String[] args) {
  
  JFrame frame = new JFrame("Rockets collision");
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
  frame.getContentPane().add(new RocketsCollisionPanel());
  frame.pack();
  frame.setVisible(true);
  
  

 }

}














//*******************RocketsCollisionPanel.java**************/
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JPanel;
import javax.swing.Timer;

public class RocketsCollisionPanel extends JPanel {

 private final int WIDTH = 600, HEIGHT = 600;
 private final int DELAY = 20; 
 
 private int[] xValues = {15,25,25,5,5};
 private int[] yValues = {5,15,55,55,15};
 
 private int[] x2Values = {285, 295, 295, 275, 275};
 
 private int deltaX1, deltaY1, deltaX2, deltaY2;
 
 

 Polygon rocket1, rocket2;
 private Timer timer;
 
 public RocketsCollisionPanel() {
  
  timer = new Timer(DELAY, new CollisionListener());
  
  rocket1 = new Polygon(xValues, yValues, xValues.length);
  rocket2 = new Polygon(x2Values, yValues, xValues.length);
  
  deltaX1 = deltaY1 = deltaX2 = deltaY2 = 5;
  
  setBackground(Color.BLACK);
  setPreferredSize(new Dimension(WIDTH, HEIGHT));
  timer.start();
  
 }
 
 @Override
 protected void paintComponent(Graphics g) {
  super.paintComponent(g);
  
  g.setColor(Color.RED);
  g.fillPolygon(rocket1);
  
  g.setColor(Color.BLUE);
  g.fillPolygon(rocket2);
 
  
 }
 
 
 private class CollisionListener  implements ActionListener {

  @Override
  public void actionPerformed(ActionEvent arg0) {
   rocket1.translate(deltaX1, deltaY1);
   rocket2.translate(deltaX2, deltaY2);
   
   Rectangle r1 = rocket1.getBounds();
   Rectangle r2 = rocket2.getBounds();
   
   
   if (r1.intersects(r2)) { 
    deltaX1 *= -1;
    deltaX2 *= -1;
    deltaY1 *= -1;
    deltaY2 *= -1;
   }
   
   Point topLeftCornerR1 = r1.getLocation();
   Point topLeftCornerR2 = r2.getLocation();
   
   double x1 = topLeftCornerR1.getX();
   double y1 = topLeftCornerR1.getY();
   double x2 = topLeftCornerR2.getX();
   double y2 = topLeftCornerR2.getY();
   
   if(x1 <= 0 || x1 >= WIDTH - 20)
    deltaX1 *= -1;
   if(y1 <= 0 || y1 >= HEIGHT - 50)
    deltaY1 *= -1;
   
   if(x2 <= 0 || x2 >= WIDTH - 20)
    deltaX2 *= -1;
   if(y2 <= 0 || y2 >= HEIGHT - 50)
    deltaY2 *= -1;
  
   repaint();
  }
  
 }
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
}

Read More