Question

I´ve been debugging this for hours now. Detecting collision. this code bellow works fine.

while (numberOfTurns >= 0)                                      
            {   
        GObject collision = getElementAt(ball.getX(),ball.getY());
        }

It will get any graphical object the ball collides with on screen and return it. However, this is not how I want to design the program. But instead make a seperate method for collision detection, like bellow:

    while (numberOfTurns >= 0)                                      
        {   
        getCollidingObject();
        }

Here is the method, it just returns itself

private GObject getCollidingObject()
{       
    return getElementAt (ball.getX(),ball.getY());
}

then I assign it to this private instance variable

private GObject collider = getCollidingObject();

But!!! it does not work, it just returns null. the first code snippet i posted works fine… anyone knows what is happening here?

Answer 1

You say that you’re assigning the return value of getCollidingObject() to a private instance variable. With the code you posted, that call is being made once on construction of your object, not every time you want the result. Try:

while (numberOfTurns >= 0)                                      
    {   
    GObject collision = getCollidingObject();
    }