Java 2d collision detection

[Arkie]

[Update]
Watch the video here: http://www.engineeringser...collision-detection-demo/



A Java 2d collision detection demo that I wrote earlier today for a game that i'm planning to make.

Screenshot

Java 2d collision detection

Code

GeSHi (java):
/*--------------------------------------------------------------------------
SpriteDemoJFrame class
 *****************
By: deAppel 	http://www.engineeringserver.com - http://www.javaforums.net
Contact:		info [@] engineeringserver.com
Version:		15/August/2008
Last updated: 	15/August/2008
 
 
 *****************
Note: a demo that shows collision detection using rectangles.
//----------------------------------------------------------------------*/
import java.awt.Color;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
 
import javax.swing.BorderFactory;
import javax.swing.JFrame;
 
public class SpriteDemoJFrame extends JFrame  implements MouseMotionListener, Runnable{
	SpriteDemo SD = new SpriteDemo();
	int sizeX = 500;
	int sizeY = 500;
	public SpriteDemoJFrame(){
		setLayout(null);
		SD.setPlayingField(sizeX,sizeY);
		SD.setBorder(BorderFactory.createLineBorder(Color.BLACK));
		SD.setSize(sizeX,sizeY);
		add(SD);
 
		setTitle("Collision detection demo");
		setDefaultCloseOperation(3);
		setSize(800,600);
		setVisible(true);
	}
 
 
	public static void main(String[] args) {
		SpriteDemoJFrame SDF = new SpriteDemoJFrame();
		SDF.run();
	}
 
	public void mouseDragged(MouseEvent e) {
	}
 
	public void run() {		
		while(true){
			Thread t = new Thread();
			try {
				t.sleep(50);
				SD.moveRectangle();
			} catch (InterruptedException e) {			
				e.printStackTrace();
			}			
		}
	}
 
	public void mouseMoved(MouseEvent e) {	}
 
}
 
Created by GeSHI 1.0.7.20

Code

GeSHi (java):
/*--------------------------------------------------------------------------
SpriteDemoJFrame class
*****************
By: deAppel 	http://www.engineeringserver.com - http://www.javaforums.net
Contact:		info [@] engineeringserver.com
Version:		15/August/2008
Last updated: 	15/August/2008
 
 
*****************
Note: a demo that shows collision detection using rectangles.
//----------------------------------------------------------------------*/
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
 
import javax.swing.JPanel;
 
 
public class SpriteDemo extends JPanel  implements MouseMotionListener{
	int positionX = 0;
	int positionY = 0;
	int positionMovingX = 0;
	int positionMovingY = 0;
	boolean flip = false;
	boolean gotHit = false;
	boolean debug = false;
	int playFieldX = 0;
	int playFieldY = 0;
	int movement = 0;
	Point x;
	int speed;
	int size = 10;
	int hit = 0;
	Rectangle rect = new Rectangle(positionMovingX,positionMovingY,size,size);
	Rectangle rect2 = new Rectangle(100,100,40,40);
 
	public SpriteDemo(){
		addMouseMotionListener(this);
	}
 
	public void paintComponent(Graphics g){
		super.paintComponent(g);
		if(debug){
		System.out.println(positionMovingX +  "   " + positionMovingY +  "  " + hit);
		}
		rect2.setLocation(positionX, positionY);	
 
		g.setColor(Color.GREEN);
		g.fillRect(rect.x,rect.y,rect.width,rect.height);
 
		g.setColor(Color.WHITE);
		g.fillRect(positionX, positionY,rect2.width,rect2.width);
 
		g.setColor(Color.BLACK);
		g.setFont(new Font("Arial",Font.BOLD,16));
 
		g.drawString("You got hit " + hit + " times", 20, 20);
 
	}
	public static void main(String[] args) {
	}
 
	public void mouseDragged(MouseEvent e) {	
		positionX = e.getX()-20;
		positionY = e.getY()-20;
		repaint();
	}
 
	public void mouseMoved(MouseEvent e) {
	}
 
	public void moveRectangle(){
		speed = (int) (5+Math.random()*20);
 
		if(flip == false){	
			positionMovingX = 	positionMovingX+speed;
			positionMovingY = 	positionMovingY+speed;
			rect.setLocation(positionMovingX, positionMovingY);
		}
		if(positionMovingX+rect.height  >= playFieldX || positionMovingY+rect.width >= playFieldY ){		
			flip = true;		
		}
 
		if(flip == true){
			speed = (int) (1+Math.random()*50);
			size = (int) (10+Math.random()*100);
 
			positionMovingX = 	positionMovingX-speed;
			positionMovingY = 	positionMovingY-speed;
 
			rect.setLocation(positionMovingX, positionMovingY);
		}
		if(positionMovingX <=0 || positionMovingY<=0 && flip == true){
			rect.setSize(size,size);
			flip = false;
 
		}
 
		if(rect.intersects(rect2) && gotHit == false){					
			hit = hit+1;
			gotHit = true;
		}
 
		if(!rect.intersects(rect2) && gotHit == true){		
			gotHit = false;
		}		
		repaint();
	}
 
	public void setPlayingField(int x, int y){
		this.playFieldX = x;
		this.playFieldY = y;
	}
}
 
Created by GeSHI 1.0.7.20

[Arkie]

Here's the sourcecode that was shown compiled in the youtube video i've uploaded.

No changes were made in the SpriteDemoJFrame.java file so you can copy the one in the first post and compile it with this one below.

Code

GeSHi (java):
/*--------------------------------------------------------------------------
SpriteDemoJFrame class
 *****************
By: HappyFace 	http://www.engineeringserver.com - http://www.javaforums.net
Contact:		info [@] engineeringserver.com
Version:		15/August/2008
Last updated: 	17/August/2008
 *****************
Note: a demo that shows collision detection using rectangles.
//----------------------------------------------------------------------*/
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
 
import javax.swing.JPanel;
 
public class SpriteDemo extends JPanel  implements MouseMotionListener{
	int positionX = 0, positionY = 0;
	int positionMovingX = 0, positionMovingY = 0;
	int playFieldX = 0, playFieldY = 0;
	int movement = 0;
	boolean flip = false, gotHit = false, debug = false, fliphit  = false;
	int speed = 0;
	int size = 10;
	int hit = 0;
	int points = 0;
 
	Rectangle rect = new Rectangle(positionMovingX,positionMovingY,size,size);
	Rectangle rect2 = new Rectangle(100,100,40,40);
 
	public SpriteDemo(){
		addMouseMotionListener(this);
	}
 
	public void paintComponent(Graphics g){
		super.paintComponent(g);
		Graphics2D g2 = (Graphics2D) g;
		if(debug){
			System.out.println(positionMovingX +  "   " + positionMovingY +  "  " + hit);
		}
		rect2.setLocation(positionX, positionY);	
 
		g2.setColor(Color.GREEN);
		g2.fillRect(rect.x,rect.y,rect.width,rect.height);
 
		g2.setColor(Color.WHITE);
		g2.fillRect(positionX, positionY,rect2.width,rect2.width);
 
		g2.setColor(Color.BLACK);
		g2.setFont(new Font("Arial",Font.BOLD,16));
 
		g2.drawString("You got hit " + hit + " times, you got " + points + " points", 20, 20);
 
	}
	public static void main(String[] args) {
	}
 
	public void mouseDragged(MouseEvent e) {	
		positionX = e.getX()-20;
		positionY = e.getY()-20;
		repaint();
	}
 
	public void mouseMoved(MouseEvent e) {
	}
 
	public void moveRectangle(){		
		speed = (int) (5+Math.random()*20);
		if(flip == false){	
			positionMovingX = 	positionMovingX+speed;
			positionMovingY = 	positionMovingY+speed;
			rect.setLocation(positionMovingX, positionMovingY);
		}
		if(positionMovingX+rect.height  >= playFieldX || positionMovingY+rect.width >= playFieldY ){		
			flip = true;		
		}
 
		if(flip == true){
			speed = (int) (1+Math.random()*50);
			size = (int) (10+Math.random()*100);
 
			positionMovingX = 	positionMovingX-speed;
			positionMovingY = 	positionMovingY-speed;
 
			rect.setLocation(positionMovingX, positionMovingY);
		}
		if(positionMovingX <=0 || positionMovingY<=0 && flip == true){
			rect.setSize(size,size);
			flip = false;
		}
 
		if(rect.intersects(rect2) && gotHit == false){					
			hit = hit+1;
			gotHit = true;
		}
 
		if(!rect.intersects(rect2) && gotHit == true){		
			gotHit = false;
		}		
 
		if(rect2.x <=0 && rect2.y <=0 && fliphit == false){
			points = points+1;
			fliphit = true;
		}
 
		if(rect2.x+size/2 >= playFieldX && rect2.y+size/2 >=playFieldY  && fliphit == true){
			points = points+1;
			fliphit = false;
		}
		repaint();
	}
 
	public void setPlayingField(int x, int y){
		this.playFieldX = x;
		this.playFieldY = y;
	}
 
 
}
 
Created by GeSHI 1.0.7.20