reflector

code/__DEFINES/math.dm

@@ -38,6 +38,10 @@
 
 #define SHORT_REAL_LIMIT 16777216
 
+// Real modulus that handles decimals
+#define MODULUS(x, y) ( (x) - (y) * round((x) / (y)) )
+
+
 //"fancy" math for calculating time in ms from tick_usage percentage and the length of ticks
 //percent_of_tick_used * (ticklag * 100(to convert to ms)) / 100(percent ratio)
 //collapsed to percent_of_tick_used * tick_lag
@@ -53,3 +57,10 @@
 
 // round() acts like floor(x, 1) by default but can't handle other values
 #define FLOOR(x, y) ( round((x) / (y)) * (y) )
+
+
+// Will filter out extra rotations and negative rotations
+// E.g: 540 becomes 180. -180 becomes 180.
+#define SIMPLIFY_DEGREES(degrees) (MODULUS((degrees), 360))
+
+#define GET_ANGLE_OF_INCIDENCE(face, input) (MODULUS((face) - (input), 360))

code/game/gamemodes/blob/blobs/shield.dm

@@ -3,9 +3,9 @@
 	icon = 'icons/mob/blob.dmi'
 	icon_state = "blob_idle"
 	desc = "Some blob creature thingy"
-	health = 75
+	health = 75 
 	fire_resist = 2
-
+	var/maxHealth = 75 
 
 /obj/structure/blob/shield/update_icon()
 	if(health <= 0)
@@ -19,3 +19,28 @@
 /obj/structure/blob/shield/CanPass(atom/movable/mover, turf/target, height=0)
 	if(istype(mover) && mover.checkpass(PASSBLOB))	return 1
 	return 0
+
+/obj/structure/blob/shield/reflective
+	name = "reflective blob"
+	desc = "A solid wall of slightly twitching tendrils with a reflective glow."
+	icon_state = "blob_idle_glow"
+	brute_resist = 0
+	health = 50
+	maxHealth = 50
+	var/reflect_chance = 80 //80% chance to reflect
+	
+/obj/structure/blob/shield/reflective/bullet_act(obj/item/projectile/P)
+	if(P.is_reflectable && prob(reflect_chance) && !istype(P, /obj/item/projectile/beam/pulse))
+		var/P_turf = get_turf(P)
+		var/face_direction = get_dir(src, P_turf)
+		var.face_angle = dir2angle(face_direction)
+		var/incidence_s = GET_ANGLE_OF_INCIDENCE(face_angle, (P.Angle + 180))
+		if(abs(incidence_s) > 90 && abs(incidence_s) < 270)
+			return FALSE
+		var/new_angle_s = SIMPLIFY_DEGREES(face_angle + incidence_s)
+		P.Angle = new_angle_s
+		P.firer = src //so people who fired the lasers are not immune to them when it reflects
+		visible_message("<span class='warning'>[P] reflects off [src]!</span>")
+		return -1// complete projectile permutation 
+	else
+		take_damage(P.damage, P.damage_type)

code/game/gamemodes/blob/overmind.dm

@@ -56,6 +56,7 @@
 	to_chat(src, "You are the overmind and can control the blob! You can expand, which will attack people, and place new blob pieces such as...")
 	to_chat(src, "<b>Normal Blob</b> will expand your reach and allow you to upgrade into special blobs that perform certain functions.")
 	to_chat(src, "<b>Shield Blob</b> is a strong and expensive blob which can take more damage. It is fireproof and can block air, use this to protect yourself from station fires.")
+	to_chat(src, "<b>Reflective Blob</b>is an upgraded Shield Blob which has a high chance of deflecting energy projectiles, but is vulnerable to ballistics and brute damage.")
 	to_chat(src, "<b>Resource Blob</b> is a blob which will collect more resources for you, try to build these earlier to get a strong income. It will benefit from being near your core or multiple nodes, by having an increased resource rate; put it alone and it won't create resources at all.")
 	to_chat(src, "<b>Node Blob</b> is a blob which will grow, like the core. Unlike the core it won't give you a small income but it can power resource and factory blobs to increase their rate.")
 	to_chat(src, "<b>Factory Blob</b> is a blob which will spawn blob spores which will attack nearby food. Putting this nearby nodes and your core will increase the spawn rate; put it alone and it will not spawn any spores.")

code/game/gamemodes/blob/powers.dm

@@ -34,7 +34,7 @@
 /mob/camera/blob/verb/create_shield_power()
 	set category = "Blob"
 	set name = "Create Shield Blob (10)"
-	set desc = "Create a shield blob."
+	set desc = "Create a shield blob. "
 
 	var/turf/T = get_turf(src)
 	create_shield(T)
@@ -59,7 +59,35 @@
 
 	return
 
+/mob/camera/blob/verb/upgrade_shield()
+	set category = "Blob"
+	set name = "Upgrade Shield Blob (20)"
+	set desc = "Using this on an existing shield blob turns it into a reflective blob, capable of reflecting most energy projectiles but making it much weaker than usual to brute attacks."
+	
+	var/turf/T = get_turf(src)
+	
+	var/obj/structure/blob/shield/S = locate(/obj/structure/blob/shield) in T
+	if(S)
+	
+		if(!can_buy(20))
+			return
 
+		if(S.health < S.maxHealth * 0.5)
+			to_chat(src, "<span class='warning'>This shield blob is too damaged to be modified properly!</span>")
+			return
+			
+		if(istype(S, /obj/structure/blob/shield/reflective))
+			to_chat(src, "<span class='warning'>There's already a reflector blob here!</span>")
+			return
+			
+		to_chat(src, "<span class='warning'>You secrete a reflective ooze over the shield blob, allowing it to reflect energy projectiles at the cost of reduced intregrity.</span>")
+		
+		S.change_to(/obj/structure/blob/shield/reflective)
+		S.color = blob_reagent_datum.color
+		
+	else
+		to_chat(src, "<span class='warning'>There is no shield blob here!</span>")
+	return
 
 /mob/camera/blob/verb/create_resource()
 	set category = "Blob"