Screwdriver: allow simple wallmounted rotation.

Allows rotating things like signs and torches. Axis rotation rotates over all 6 faces, face rotation flips upside down to flat on floor only, and of course in the 4 horizontal directions. Made the code a bit more modular to account for different rotation schemes. Should be easier to extend from here on to other needs, and the functions can be reused by other mods for convenience.
minetest · Mar 12, 2017 · f14b0a6 · f14b0a6
1 parent 0850314
commit f14b0a6
Showing 1 changed file with 29 additions and 13 deletions.
diff --git a/mods/screwdriver/init.lua b/mods/screwdriver/init.lua
@@ -19,6 +19,31 @@ screwdriver.rotate_simple = function(pos, node, user, mode, new_param2)
 	end
 end
 
+screwdriver.rotate = {}
+
+screwdriver.rotate.facedir = function(node, mode)
+	-- Compute param2
+	local rotationPart = node.param2 % 32 -- get first 4 bits
+	local preservePart = node.param2 - rotationPart
+	local axisdir = math.floor(rotationPart / 4)
+	local rotation = rotationPart - axisdir * 4
+	if mode == screwdriver.ROTATE_FACE then
+		rotationPart = axisdir * 4 + nextrange(rotation, 3)
+	elseif mode == screwdriver.ROTATE_AXIS then
+		rotationPart = nextrange(axisdir, 5) * 4
+	end
+
+	return preservePart + rotationPart
+end
+
+local wallmounted_tbl = {
+	[screwdriver.ROTATE_FACE] = {[2] = 5, [3] = 4, [4] = 2, [5] = 3, [1] = 0, [0] = 1},
+	[screwdriver.ROTATE_AXIS] = {[2] = 5, [3] = 4, [4] = 2, [5] = 1, [1] = 0, [0] = 3}
+}
+screwdriver.rotate.wallmounted = function(node, mode)
+	return wallmounted_tbl[mode][node.param2]
+end
+
 -- Handles rotation
 screwdriver.handler = function(itemstack, user, pointed_thing, mode, uses)
 	if pointed_thing.type ~= "node" then
@@ -34,23 +59,14 @@ screwdriver.handler = function(itemstack, user, pointed_thing, mode, uses)
 
 	local node = minetest.get_node(pos)
 	local ndef = minetest.registered_nodes[node.name]
-	-- verify node is facedir (expected to be rotatable)
-	if not ndef or ndef.paramtype2 ~= "facedir" then
+	-- can we rotate this paramtype2?
+	local fn = screwdriver.rotate[ndef.paramtype2]
+	if not fn then
 		return
 	end
-	-- Compute param2
-	local rotationPart = node.param2 % 32 -- get first 4 bits
-	local preservePart = node.param2 - rotationPart
-	local axisdir = math.floor(rotationPart / 4)
-	local rotation = rotationPart - axisdir * 4
-	if mode == screwdriver.ROTATE_FACE then
-		rotationPart = axisdir * 4 + nextrange(rotation, 3)
-	elseif mode == screwdriver.ROTATE_AXIS then
-		rotationPart = nextrange(axisdir, 5) * 4
-	end
 
-	local new_param2 = preservePart + rotationPart
 	local should_rotate = true
+	local new_param2 = fn(node, mode)
 
 	-- Node provides a handler, so let the handler decide instead if the node can be rotated
 	if ndef and ndef.on_rotate then