Wibbly Gravity Well Artifact (#17541)

Co-authored-by: Amylizzlep <amylizzle@users.noreply.github.com>

code/obj/artifacts/artifact_machines/grav_well.dm

@@ -2,6 +2,17 @@
 	name = "artifact gravity well generator"
 	associated_datum = /datum/artifact/gravity_well_generator
 
+/obj/effect/grav_pulse
+	icon='icons/effects/overlays/lensing.dmi'
+	icon_state="blank" //haha such hackery
+	pixel_x = -224
+	pixel_y = -224
+	plane = PLANE_DISTORTION
+	appearance_flags = PIXEL_SCALE | RESET_COLOR | RESET_ALPHA
+
+	proc/pulse()
+		flick("pulse",src)
+
 /datum/artifact/gravity_well_generator
 	associated_object = /obj/machinery/artifact/gravity_well_generator
 	type_name = "Gravity Well"
@@ -21,15 +32,28 @@
 	var/field_radius = 7
 	var/gravity_type = 0 // push or pull?
 	examine_hint = "It is covered in very conspicuous markings."
+	var/obj/effect/grav_pulse/lense
 
 	New()
 		..()
 		src.field_radius = rand(4,9) // well radius
 		src.gravity_type = rand(0,1) // 0 for pull, 1 for push
+		lense = new()
+
+	effect_activate(obj/O)
+		. = ..()
+		O.vis_contents += lense
+
+	effect_deactivate(obj/O)
+		. = ..()
+		O.vis_contents -= lense
 
 	effect_process(var/obj/O)
 		if (..())
 			return
+
+		lense.pulse()
+
 		for (var/obj/V in orange(src.field_radius,get_turf(O)))
 			if (V.anchored)
 				continue