/// @description Update GUI Variables

_cam = view_get_camera(0);
_cam_x = camera_get_view_x(_cam);
_cam_y = camera_get_view_y(_cam);
_cam_width = camera_get_view_width(_cam);
_cam_height = camera_get_view_height(_cam);
_cam_center_x = _cam_width/2;
_cam_center_y = _cam_height/2;