use screen origin when centering window
use screen origin when centering window

theblacklion/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,theblacklion/pyglet