python - Why does the mouse input not work correctly? -

i've spent past week creating raycasting algorithm in python using pygame, , ran fine before added textures walls. when running in windowed mode mouse input not work properly, , solution made q , e keys job of turning camera instead. code can found here, run in windowed mode you'll have change these lines:

width    = 1360 height   = 768  screen   = pygame.display.set_mode((width, height), pygame.hwsurface|pygame.doublebuf|pygame.fullscreen) 

to these lines:

width    = 680  height   = 384  screen   = pygame.display.set_mode((width, height)) 

so entire screen can seen in windowed mode.

so why mouse input doesn't work properly, , can fix it?