php man page for set_mouse_range

set_mouse_range(3alleg4)					  Allegro manual					  set_mouse_range(3alleg4)

NAME
       set_mouse_range - Sets the area of the screen restricting mouse movement. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       void set_mouse_range(int x1, int y1, int x2, int y2);

DESCRIPTION
       Sets the area of the screen within which the mouse can move. Pass the top left corner and the bottom right corner (inclusive). If you don't
       call this function the range defaults to (0, 0, SCREEN_W-1, SCREEN_H-1).

SEE ALSO
       install_mouse(3alleg4), set_mouse_speed(3alleg4), position_mouse(3alleg4)

Allegro 							   version 4.4.2					  set_mouse_range(3alleg4)