Absolute position = Relative position * Parent size
If there is no parent, parent size will be screen size.
For example, My resolution is 1920x1080,
dgsCreateWindow(0.5,0.5,0.2,0.2,"test",true)
The relative position of window is x:0.5, y:0.5
The absolute position of window is x:960, y:540 ( x:1920*0.5, y:1080*0.5 )
The relative size of window is x:0.2, y:0.2
The absolute size of window is x:384, y:215 ( x:1920*0.2, y:1080*0.2 )