RedMew/locale/gen_shape/spiral.lua

if shape_module then return end
shape_module = true

function run_shape_module(event)
	local area = event.area 
	local surface = event.surface
	local tiles = {}
	
	top_left = area.left_top	--make a more direct reference
	
	--if top_left.y > 80 or top_left.x > 180 or top_left.x < -180 then
		for x = top_left.x-1, top_left.x + 32 do
			for y = top_left.y-1, top_left.y + 32 do       

				local distance = math.sqrt(x*x + y*y)
				if distance > 128 then
					local angle = 180 + math.deg(math.atan2(x,y))
					
					local offset = distance
					if angle ~= 0 then offset = offset + angle /3.75 end
					--if angle ~= 0 then offset = offset + angle /1.33333333 end
					
					if offset % 96 < 48 then
						table.insert(tiles, {name = "out-of-map", position = {x,y}}) 
					end
				end
			end
		end
		surface.set_tiles(tiles)
		
		--return false
	--end
	
	return true
end