Add maidroid_core's aux

maidroid_core/cores/_aux.lua

@@ -0,0 +1,28 @@
+------------------------------------------------------------
+-- Copyright (c) 2016 tacigar. All rights reserved.
+-- https://github.com/tacigar/maidroid
+------------------------------------------------------------
+
+maidroid_core._aux = {}
+
+local default_searching_range = {
+	x = 5, y = 1, z = 5,
+}
+
+-- maidroid_core._aux.search_surrounding searchs maidroid surrounding.
+function maidroid_core._aux.search_surrounding(self, pred, searching_range)
+	if searching_range == nil then
+		searching_range = default_searching_range
+	end
+	for x = -searching_range.x, searching_range.x do
+		for y = -searching_range.y, searching_range.y do
+			for z = -searching_range.z, searching_range.z do
+				local pos = {x = x, y = y, z = z}
+				if pred(self, pos) then
+					return pos
+				end
+			end
+		end
+	end
+	return nil
+end