Designing Games with Game Maker - YoYo Games

• Game end: The event happens to all instances when the game ends. Again typically
just one object defines this event. It is for example used to store certain data in a file.
• Room start: This event happens for all instances initially in a room when the room
starts. It happens after the creation events.
• Room end: This event happens to all existing instances when the room ends.
• No more lives: Game Maker has a built-in lives system. There is an action to set and
change the number of lives. Whenever the number of lives becomes less than or equal
to 0, this event happens. It is typically used to end or restart the game.
• No more health: Game Maker has a built-in health system. There is an action to set
and change the health. Whenever the health becomes less than or equal to 0, this
event happens. It is typically used to reduce the number of lives or to restart the
game.
• End of animation: As indicated above, an animation consists of a number of images
that are shown one after the other. After the last one is shown we start again with the
first one. The event happens at precisely that moment. As an example, this can be
used to change the animation, or destroy the instance.
• End of path: This event happens when the instance follows a path and the end of the
path is reached.
• Close button: This event happens when the user clicks on the close button of the
window. This only happens when disabling in the game settings the option to have the
close button behave as the Escape key.
• User defined: There are 16 of these events. They normally never happen unless you
yourself call them from a piece of code.
Drawing event
Instances, when visible, draw their sprite in each step on the screen. When you specify actions
in the drawing event, the sprite is not drawn, but these actions are executed instead. This can
be used to draw something other than the sprite, or first make some changes to sprite
parameters. There are a number of drawing actions that are especially meant for use in the
drawing event. Note that the drawing event is only executed when the object is visible. Also
note that, independent of what you draw, collision events are based on the sprite that is
associated with the instance.
Key press events
This event is similar to the keyboard event but it happens only once when the key is pressed,
rather than continuously. This is useful when you want an action to happen only once.