Merge pull request #629 from tigercat2000/portgetPixelDistance

Ports getPixelDistance() from -tg-

code/__HELPERS/unsorted.dm

@@ -1268,6 +1268,39 @@ proc/get_mob_with_client_list()
 			if (0)
 				return
 
+//Finds the distance between two atoms, in pixels
+/proc/getPixelDistance(var/atom/A, var/atom/B)
+	if(!istype(A)||!istype(B))
+		return 0
+
+	var/_x1 = A.x
+	var/_x2 = B.x
+	var/_y1 = A.y
+	var/_y2 = B.y
+
+	//Ensure _x1 is bigger, simplicity
+	if(_x2 > _x1)
+		var/tx = _x1
+		_x1 = _x2
+		_x2 = tx
+
+	//Ensure _y1 is bigger, simplicity
+	if(_y2 > _y1)
+		var/ty = _y1
+		_y1 = _y2
+		_y2 = ty
+
+	//DY/DX
+	var/dx = _x1 - _x2 + A.pixel_x + B.pixel_x
+	var/dy = _y1 - _y2 + A.pixel_y + B.pixel_y
+
+	//Distance check
+	if(dx == 0 && dy == 0) //No distance, don't bother calculating
+		return 0
+
+	. = sqrt(((dx**2) + (dy**2)))
+
+
 /proc/get(atom/loc, type)
 	while(loc)
 		if(istype(loc, type))
@@ -1627,4 +1660,4 @@ atom/proc/GetTypeInAllContents(typepath)
 		if(prob(chance))
 			step(AM, pick(alldirs))
 		chance = max(chance - (initial_chance / steps), 0)
-		steps--
+		steps--