Designing Games with Game Maker - YoYo Games

part_type_create() Creates a new particle type. It returns the index of the
type. This index must be used in all calls below to set the properties of the
particle type. So you will often store it in a global variable.
part_type_destroy(ind) Destroys particle type ind. Call this if you don't
need it anymore to save space.
part_type_exists(ind) Returns whether the indicated particle type exists.
part_type_clear(ind) Clears the particle type ind to its default settings.
The shape of a particle
A particle has a shape. This shape is indicated by a sprite. You can use any sprite you like for
your particles but there are 15 built-in sprites. These are all 64x64 in size and have alpha
values set such that they nicely blend with the background. They are indicate by the following
constants:
• pt_shape_pixel
• pt_shape_disk
• pt_shape_square
• pt_shape_line
• pt_shape_star
• pt_shape_circle
• pt_shape_ring
• pt_shape_sphere
• pt_shape_flare
• pt_shape_spark
• pt_shape_explosion
• pt_shape_cloud
• pt_shape_smoke
• pt_shape_snow
You set the shape using the following function:
part_type_shape(ind,shape) Sets the shape of the particle type to any of
the constants above (default is pt_shape_pixel).
You can also use your own sprite for the particle. If the sprite has multiple subimages you can
indicate what should be done with them. You can pick a random one, animate the sprite, start