|id||The id of the joystick (1 or 2).|
This function will return the position of the u-axis of the
joystick/gamepad with the given id, with the value being somewhere
between -1 and 1. See the image below for the relationship between
the different axes of rotation that are accepted. The id can be
either 1 or 2 as GameMaker: Studio only accepts input from a
maximum of two joysticks/gamepads.
NOTE: This function is only available for Windows.
uu += spd * joystick_upos(1);
The above code uses the returned value of the joystick_ypos function to set a variable within the instance.