Select a custom coordinates scale (x,y) for 2D screens.
This statement does not change screen resolution; only 2D coordinates.
Backsic uses the same convention for 2D and 3D coordinates: the vertical axis goes upward.
scale screen l,d to r,u
l left d bottom r right u top
Source ' 0,0 is center of screen scale screen -100, -100 to 100, 100 ' Pixels coords for a 1920p screen scale screen 0, 1080 to 1920, 0