You know in model program they have a multiple windows, that I can make also. But, how do they have it so 1 window, the center, is 0,0? Then if you move mouse left the coordinates are negative, you move right the are positive, you move up they positive, and move down below 0,0 it is negative.
How they do that? I try, and 0,0 for me is one of the corners of the window. I search for something to make 0,0 center of window, but I can not find!