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  Collision Handling Issue - Brick Breaker Game  (Read 1147 times)
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Offline SteM

Junior Newbie





« Posted 2011-12-16 12:41:29 »

  Hello guys, i'm working on a game project which is a basic brick breaker type game but i have some trouble in collisions between ball and the bricks. I wanted to revert the balls velocity according to the side of the brick that ball collides with. For this purpose i provided the code below. Here i got a problem, when the ball hits to a brick it just simply reverts the both velocities ( i am aware that my code over detects collisions ), my question is that, is there any better approach that can i follow, because it seems that i cannot handle the 4 side collisions with this approach. Any suggestions will be appreciated, thanks.
             
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if ( ball.getBounds().intersects(brick.getBounds()) )
{
                  boolean bottom  = ball.getVy() < 0 && ball.getY()<= brick.getY() + brick.getHeight();
                  boolean top  = ball.getVy() > 0 && ball.getY()+ball.getHeight()>= brick.getY();
                  boolean left = ball.getVx() > 0 && ball.getX() + ball.getWidth() >= brick.getX();
                  boolean right = ball.getVx() < 0 && ball.getX() <= brick.getX()+brick.getWidth();
                 
                  // Left Side
                  if (left)
                  {
                     ball.setPosX(br.getX() - ball.getWidth()); // reposition ball
                     ball.setVx(-ball.getVx());
                     
                  }

                  // Right Side
                  else if (right)
                  {
                     ball.setPosX(br.getX());        // reposition ball
                     ball.setVx(-ball.getVx());
                     
                  }

                  // Bottom Side
                  if (bottom)
                  {
                     ball.setPosY(brick.getY()+brick.getHeight());    // reposition ball
                     ball.setVy(-ball.getVy());
                  }
                 
                  // Top Side
                  else if (top)
                  {
                     ball.setPosY(brick.getY()-ball.getHeight());    //reposition ball
                     ball.setVy(-ball.getVy());
                  }
}
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