Designing Games with Game Maker - YoYo Games

Set Friction
Friction slows down the instances when they move. You specify the amount of friction. In each
step this amount is subtracted from the speed until the speed becomes 0. Normally you want
a very small number here (like 0.01).
Jump to Position
Using this action you can place the instance in a particular position. You simply specify the x-
and y-coordinate, and the instance is placed with its reference point on that position. If you
check the Relative box, the position is relative to the current position of the instance. This
action is often used to continuously move an instance. In each step we increment the position
a bit.
Jump to Start
This action places the instance back at the position where it was created.
Jump to Random
This action moves the instance to a random position in the room. Only positions are chosen
where the instance does not intersect any solid instance. You can specify the snapping used. If
you specify positive values, the coordinates chosen with be integer multiples of the indicated
values. This could for example be used to keep the instance aligned with the cells in your
game (if any). You can specify a separate horizontal snapping and vertical snapping.
Align to Grid
With this action you can round the position of the instance to a grid. You can indicate both the
horizontal and vertical snapping value (that is, the size of the cells of the grid). This can be
very useful to make sure that instances stay on a grid.
Wrap Screen
With this action you can let an instance wrap around, that is, when it leaves on one side of the
room it reappears at the other side. This action is normally used in the Outside event. Note
that the instance must have a speed for wrapping to work, cause the direction of wrapping is
based on the direction of the motion. You can indicate whether to wrap only horizontal, only
vertical, or in both directions.
Move to Contact
With this action you can move the instance in a given direction until a contact position with an