Designing Games with Game Maker - YoYo Games

To create a time line, choose Create Time Line from the Resources menu. The following
form will pop up.
It looks a bit like the object properties form. At the left you can set the name and there are
buttons to add and modify moments in the time line. Next there is the list of moments. This
list specifies the moments in time steps at which assigned action(s) will happen. Then there is
the familiar list of actions for the selected moment and finally there is the total set of actions
available.
To add a moment press the button Add. Indicate the moment of time (this is the number of
steps since the time line was started). Now you can drag actions to the list as for object
events. There are also buttons to delete the selected moment, to change the time for the
selected moment, to duplicate a moment and to clear the time line.
Finally there are two special buttons. With the Merge button you can merge all moments in a
time interval into one. With the Shift button you can shift all moments in a time interval
forwards or backwards by a given amount of time. Make sure you do not create negative time
moments. They will never be executed.
There are two actions related to time lines.
Set a time line
With this action you set the particular time line for an instance of an object. You indicate the
time line and the starting position within the time line (0 is the beginning). You can also use
this action to end a time line by choosing No Time Line as value.