Designing Games with Game Maker - YoYo Games

instance_activate_all();
instance_deactivate_region(view_xview[0],view_yview[0],
view_wview[0],view_hview[0],false,true);
}
In practice you might want to use a region slightly larger than the view.
Timing
Good games require careful timing of things happening. Fortunately Game Maker does most of
the timing for you. It makes sure things happen at a constant rate. This rate is defined when
defining the rooms. But you can change it using the global variable room_speed. So for
example, you can slowly increase the speed of the game, making it more difficult, by adding a
very small amount (like 0.001) to room_speed in every step. If your machine is slow the game
speed might not be achieved. This can be checked using the variable fps that constantly
monitors the actual number of frames per second. Finally, for some advanced timing you can
use the variable current_time that gives the number of milliseconds since the computer was
started. Here is the total collection of variables available (only the first one can be changed):
room_speed Speed of the game in the current room (in steps per second).
fps* Number of frames that are actually drawn per second.
current_time* Number of milliseconds that have passed since the system
was started.
current_year* The current year.
current_month* The current month.
current_day* The current day.
current_weekday* The current day of the week (1=sunday, ...,
7=saturday).
current_hour* The current hour.
current_minute* The current minute.
current_second* The current second.
Sometimes you might want to stop the game for a short while. For this, use the sleep
function.
sleep(numb) Sleeps numb milliseconds.