User interaction
There is no game without interaction with the user. The standard
way of doing this in Game Maker is to put actions in mouse
or keyboard events. But sometimes you need more control. From
within a piece of code you can check whether certain keys on the
keyboard are pressed and you can check for the position of the
mouse and whether its buttons are pressed. Normally you check these
aspects in the step event of some controller object and take action
accordingly.
Information on user interaction can be found in the following
pages:
The Keyboard
The Mouse
The Joystick