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Thread: collision detection not working...

  1. #1
    Junior Member
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    Default collision detection not working...

    I am coding a game that is a maze and im trying to figure out where to put my collision detection but anywhere it try it it doesnt work... i tried to put it int o multiple classes but it got to confuzing so i started basic. the code is... please help!
    package ballgame;

    import java.awt.Color;
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.Rectangle;
    import java.awt.event.KeyAdapter;
    import java.awt.event.KeyEvent;

    import javax.swing.ImageIcon;
    import javax.swing.JFrame;
    //create class that extends JFrame


    public class BALLGAME extends JFrame implements Runnable {


    double p1speed = .5, p2speed = .5;
    int x, y, xDirection, yDirection;
    private Image dbImage;
    private Graphics dbGraphics;
    Image face;



    public void run(){
    try{
    while(true){
    move();

    Thread.sleep(3);
    }

    }catch(Exception e){
    System.out.println("ERROR");
    }
    }

    public void move(){
    x += xDirection;
    y += yDirection;
    if(x <= 0)
    x=0;
    if(x>= 1180)
    x=1180;
    if(y <= 20)
    y = 20;
    if(y >= 780)
    y = 780;


    }
    public void setXDirection(int xdir){
    xDirection = xdir;

    }

    public void setYDirection(int ydir){
    yDirection = ydir;
    }

    public class AL extends KeyAdapter{
    public void keyPressed(KeyEvent e){
    int Keycode = e.getKeyCode();
    if(Keycode == e.VK_UP){
    setYDirection(-1);

    }
    if(Keycode == e.VK_LEFT){
    setXDirection(-1);

    }
    if(Keycode == e.VK_DOWN){
    setYDirection(+1);

    }
    if(Keycode == e.VK_RIGHT){
    setXDirection(+1);
    }


    }
    public void keyReleased(KeyEvent e){
    int Keycode = e.getKeyCode();
    if(Keycode == e.VK_UP){
    setYDirection(0);

    }
    if(Keycode == e.VK_LEFT){
    setXDirection(0);
    }
    if(Keycode == e.VK_DOWN){
    setYDirection(0);
    }
    if(Keycode == e.VK_RIGHT){
    setXDirection(0);
    }

    }
    }




    //constructor to create frame properties
    public BALLGAME(){


    setTitle("spanky babies");
    addKeyListener(new AL());
    setSize(1200,800);
    setVisible(true);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


    x = 150;
    y = 150;

    }
    //main method
    public static void main(String [] args){

    //calls the frame
    BALLGAME t = new BALLGAME();

    Thread t1 = new Thread(t);
    t1.start();
    }









    public void paint(Graphics g){
    dbImage =createImage(getWidth(), getHeight());
    dbGraphics = dbImage.getGraphics();
    paintCopmponent(dbGraphics);
    g.drawImage(dbImage, 0, 0, this);
    }
    // a graphics method allowing you to access the graphics to draw on the screen
    public void paintCopmponent(Graphics g){
    Rectangle p1 = new Rectangle(250,750,20,20);
    Rectangle ob = new Rectangle(200,250,90,90);

    g.setColor(Color.GRAY);

    g.fillRect(ob.x, ob.y, ob.width, ob.height);


    g.setColor(Color.blue);
    //draw player 1

    g.fillRect(x, y,p1.width, p1.height);


    if(p1.intersects(ob)){
    //to test if it works
    System.out.println("x");





    }
    //Collision












    //paint it all
    repaint();

    }

    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: collision detection not working...

    Please Edit your post and wrap your code with[code=java]<YOUR CODE HERE>[/code] to get highlighting.

    When you change the x and y values of the thing that is moving, you could test the new values to see if they will cause a collision.

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