Question

So I am stumped. Here is my collision check method`

 public void checkCollision ()
  {
   for (int i = 0; i < bullets.size()-1; i ++)
{
  for (int j = 0; j < enemiesLaunched.size()-1; j++)
  {
    Rectangle temp = enemiesLaunched.get(j).getRectangle();
    Rectangle temp2 = bullets.get(i).getRectangle();
    `

    if (temp2.intersects (temp))
    {
      String str = bullets.get(i).getPath();

      // since the bullets are selective, the following code is to check
      // if the right bullets hit the right germs

      if (str.equals("oil gland.png")) // bullet is from oil gland
      {
        if (enemiesLaunched.get(j).getInfo().equals("highAcid"))
        {
         enemiesLaunched.get(j).setVisible(false);
         bullets.remove(i);
        }
      }
      else if (str.equals ("sweat gland.png"))
      {
        if (enemiesLaunched.get(j).getInfo().equals("lysozome"))
        {
         enemiesLaunched.get(j).setVisible(false);
         bullets.remove(i);
        }
      }
      else
      {
        if (enemiesLaunched.get(j).getInfo().equals("mucus"))
        {
         enemiesLaunched.get(j).setVisible(false);
         bullets.remove(i);
        }
      }

`

On my mac, it works exactly how I intended. However, on my PC, it does not. To make matters more baffling, I have implemented the same logic on games further along in the game, and it works just fine on both the mac and pc, any help would be greatly appreciated!

Answer 1

How are you doing your time delta, and what is the velocity on the two objects? If your time delta is sufficiently large enough, you might not detect the collision as the two objects could have pass right through each other between checks. Have a look here for an explaination.