1 files changed, 44 insertions, 0 deletions
diff --git a/digistuff/internal.lua b/digistuff/internal.lua
new file mode 100644
index 0000000..494a206
--- /dev/null
+++ b/digistuff/internal.lua
@@ -0,0 +1,44 @@
+digistuff.rotate_rules = function(rulesin,dir)
+	local rules = {}
+	for k,v in ipairs(rulesin) do rules[k] = v end
+	if dir.z > 0 then
+		return rules
+	elseif dir.z < 0 then
+		for _,i in ipairs(rules) do
+			i.x = -i.x
+			i.z = -i.z
+		end
+		return rules
+	elseif dir.x > 0 then
+		for _,i in ipairs(rules) do
+			local z = i.x
+			i.x = i.z
+			i.z = -z
+		end
+		return rules
+	elseif dir.x < 0 then
+		for _,i in ipairs(rules) do
+			local z = i.x
+			i.x = -i.z
+			i.z = z
+		end
+		return rules
+	elseif dir.y > 0 then
+		for _,i in ipairs(rules) do
+			local z = i.y
+			i.y = i.z
+			i.z = z
+		end
+		return rules
+	elseif dir.y < 0 then
+		for _,i in ipairs(rules) do
+			local z = i.y
+			i.y = -i.z
+			i.z = -z
+		end
+		return rules
+	else
+		minetest.log("warning",string.format("digistuff.rotate_rules() called with invalid direction %s,%s,%s",dir.x,dir.y,dir.z))
+		return {}
+	end
+end