|ind||The index of the particle system to draw the particles of.|
With this function you can force a particle system to draw all
the current particles on the screen. If part_system_automatic_draw
is switched off then this function will show the particles when
used in the draw event of an instance, or it can be used when the
drawing target is set to a surface (using surface_set_target)
to draw the particles in the system to that surface.
The above code checks to see if the surface indexed in the variable "surf" exists, and if it does it then sets the drawing target to the surface, draws the particles and then resets the drawing target so all normal drawing appears on the screen once more.