Designing Games with Game Maker - YoYo Games

16 = Push from top
17 = Push from bottom
18 = Rotate to the left
19 = Rotate to the right
20 = Blend the rooms
21 = Fade out and in
transition_steps Indicates the number of steps in the transition. The more
steps, the longer the transition takes. Default is 80.
transition_define(kind,name) You can actually create your own
transitions. To this end you must define a script (possibly in an extension
package) to do the transition. With this function you can then add the
transition to the system. kind is the index of the transition (either a new one
or an existing transitions). name is the name of the script. Note that the name
of the script is a string! So there must be quotes around it. Note that this is
really advanced stuff. The script must take five arguments: a surface with the
image of the previous room, a surface with the image of the next room, the
width of the surfaces, the height of the surfaces, and the fraction of the
transition (between 0 and 1). It must then draw the image using the two
surfaces.
transition_exists(kind) This function returns whether a transition of the
indicated kind exists.
Please note that transitions do not work when using using 3d graphics. Also, room transitions
in general do not work correctly when the sizes of the rooms (or to be more precise of the
region on the screen) are not the same.
Score
Other important aspects of many games are the score, the health, and the number of lives.
Game Maker keeps track of the score in a global variable score and the number of lives in
a global variable lives. You can change the score by simply changing the value of this variable.
The same applies to health and lives. If lives is larger than 0 and becomes smaller than or
equal to 0 the no-more-lives event is performed for all instances. If you don't want to show
the score and lives in the caption, set the variable show_score, etc., to false. Also you can
change the caption. For more complicated games best display the score yourself.