splits effect_system.dm into multiple files

code/game/objects/effects/effect_system/effect_system.dm

@@ -0,0 +1,62 @@
+/* This is an attempt to make some easily reusable "particle" type effect, to stop the code
+constantly having to be rewritten. An item like the jetpack that uses the ion_trail_follow system, just has one
+defined, then set up when it is created with New(). Then this same system can just be reused each time
+it needs to create more trails.A beaker could have a steam_trail_follow system set up, then the steam
+would spawn and follow the beaker, even if it is carried or thrown.
+*/
+
+
+/obj/effect/effect
+	name = "effect"
+	icon = 'icons/effects/effects.dmi'
+	mouse_opacity = 0
+	unacidable = 1//So effect are not targeted by alien acid.
+
+/obj/effect/effect/New()
+	..()
+	if(ticker)
+		cameranet.updateVisibility(src)
+
+/obj/effect/effect/Destroy()
+	if(ticker)
+		cameranet.updateVisibility(src)
+	return ..()
+
+/obj/effect/proc/delete()
+	qdel(src)
+
+/datum/effect/proc/fadeOut(var/atom/A, var/frames = 16)
+	if(A.alpha == 0) //Handle already transparent case
+		return
+	if(frames == 0)
+		frames = 1 //We will just assume that by 0 frames, the coder meant "during one frame".
+	var/step = A.alpha / frames
+	for(var/i = 0, i < frames, i++)
+		A.alpha -= step
+		sleep(world.tick_lag)
+	return
+
+/datum/effect/system
+	var/number = 3
+	var/cardinals = 0
+	var/turf/location
+	var/atom/holder
+	var/setup = 0
+
+	Destroy()
+		holder = null
+		location = null
+		return ..()
+
+	proc/set_up(n = 3, c = 0, turf/loc)
+		if(n > 10)
+			n = 10
+		number = n
+		cardinals = c
+		location = loc
+		setup = 1
+
+	proc/attach(atom/atom)
+		holder = atom
+
+	proc/start()