Add a tree swing

model and textures by jp

To place, point at the underside of a node, e.g. a ceiling or the bottom
side of tree leaves or something.  It will automatically stretch
downward trying to find the ground (well, anything that isn't
buildable_to anyway), down to a maximum of 4 meters' worth of rope.

To remove, dig the swing itself and it'll take the rope with it.

homedecor/crafts.lua

@@ -2748,4 +2748,29 @@ minetest.register_craft({
 	},
 })
 
+minetest.register_craft({
+	output = "homedecor:swing",
+	recipe = {
+		{ "farming:string","","farming:string" },
+		{ "farming:string","","farming:string" },
+		{ "farming:string","stairs:slab_wood","farming:string" }
+	},
+})
 
+minetest.register_craft({
+	output = "homedecor:swing",
+	recipe = {
+		{ "farming:string","","farming:string" },
+		{ "farming:string","","farming:string" },
+		{ "farming:string","moreblocks:slab_wood","farming:string" }
+	},
+})
+
+minetest.register_craft({
+	output = "homedecor:swing",
+	recipe = {
+		{ "farming:string","","farming:string" },
+		{ "farming:string","","farming:string" },
+		{ "farming:string","moreblocks:panel_wood_1","farming:string" }
+	},
+})

homedecor/init.lua

@@ -146,6 +146,54 @@ function homedecor.stack_sideways(itemstack, placer, pointed_thing, node1, node2
 	end
 end
 
+-- Determine if the item being pointed at is the underside of a node (e.g a ceiling)
+
+function homedecor.find_ceiling(itemstack, placer, pointed_thing)
+	-- most of this is copied from the rotate-and-place function in builtin
+	local unode = core.get_node_or_nil(pointed_thing.under)
+	if not unode then
+		return
+	end
+	local undef = core.registered_nodes[unode.name]
+	if undef and undef.on_rightclick then
+		undef.on_rightclick(pointed_thing.under, unode, placer,
+				itemstack, pointed_thing)
+		return
+	end
+	local pitch = placer:get_look_pitch()
+	local fdir = core.dir_to_facedir(placer:get_look_dir())
+	local wield_name = itemstack:get_name()
+
+	local above = pointed_thing.above
+	local under = pointed_thing.under
+	local iswall = (above.y == under.y)
+	local isceiling = not iswall and (above.y < under.y)
+	local anode = core.get_node_or_nil(above)
+	if not anode then
+		return
+	end
+	local pos = pointed_thing.above
+	local node = anode
+
+	if undef and undef.buildable_to then
+		pos = pointed_thing.under
+		node = unode
+		iswall = false
+	end
+
+	if core.is_protected(pos, placer:get_player_name()) then
+		core.record_protection_violation(pos,
+				placer:get_player_name())
+		return
+	end
+
+	local ndef = core.registered_nodes[node.name]
+	if not ndef or not ndef.buildable_to then
+		return
+	end
+	return isceiling, pos
+end
+
 -- load various other components
 
 dofile(homedecor.modpath.."/misc-nodes.lua")					-- the catch-all for all misc nodes

homedecor/misc-nodes.lua

@@ -1788,6 +1788,7 @@ minetest.register_node("homedecor:swing", {
 		"homedecor_swing_bottom.png",
 		"homedecor_swing_sides.png"
 	},
+	inventory_image = "homedecor_swing_inv.png",
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",
@@ -1795,19 +1796,62 @@ minetest.register_node("homedecor:swing", {
 	node_box = {
 		type = "fixed",
 		fixed = {
-			{-0.3125, 0.33, -0.125, 0.3125, 0.376, 0.1875}, -- NodeBox1
+			{-0.3125, 0.33, -0.125,  0.3125, 0.376, 0.1875}, -- NodeBox1
-			{-0.3125, 0.376, 0.025, -0.3, 0.5, 0.0375}, -- NodeBox2
+			{-0.3125, 0.376, 0.025, -0.3,    0.5,   0.0375}, -- NodeBox2
-			{0.3, 0.376, 0.025, 0.3125, 0.5, 0.0375}, -- NodeBox3
+			{ 0.3,    0.376, 0.025,  0.3125, 0.5,   0.0375}, -- NodeBox3
 		}
 	},
+	selection_box = {
+		type = "fixed",
+		fixed = { -0.3125, 0.33, -0.125, 0.3125, 0.5, 0.1875 }
+	},
 	on_place = function(itemstack, placer, pointed_thing)
-		return homedecor.stack_vertically(itemstack, placer, pointed_thing,
+		isceiling, pos = homedecor.find_ceiling(itemstack, placer, pointed_thing)
-			"homedecor:swing", "homedecor:swing_rope")
+		if isceiling then
+			local height = 0
+
+			for i = 0, 4 do	-- search up to 5 spaces downward from the ceiling for the first non-buildable-to node...
+				height = i
+				local testpos = { x=pos.x, y=pos.y-i-1, z=pos.z }
+				local testnode = minetest.get_node(testpos)
+				local testreg = core.registered_nodes[testnode.name]
+
+				if not testreg.buildable_to then
+					if i < 1 then
+						minetest.chat_send_player(placer:get_player_name(), "No room under there to hang a swing.")
+						return
+					else
+						break
+					end
+				end
+			end
+
+			for j = 0, height do -- then fill that space with ropes...
+				local testpos = { x=pos.x, y=pos.y-j, z=pos.z }
+				local testnode = minetest.get_node(testpos)
+				local testreg = core.registered_nodes[testnode.name]
+				minetest.set_node(testpos, { name = "homedecor:swing_rope", param2 = fdir })
+			end
+
+			minetest.set_node({ x=pos.x, y=pos.y-height, z=pos.z }, { name = "homedecor:swing", param2 = fdir })
+
+			if not homedecor.expect_infinite_stacks then
+				itemstack:take_item()
+				return itemstack
+			end
+
+		else
+			minetest.chat_send_player(placer:get_player_name(), "You have to point at the bottom side of an overhanging object to place a swing.")
+		end
 	end,
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
-		local pos2 = { x = pos.x, y=pos.y + 1, z = pos.z }
+		for i = 0, 4 do
-		if minetest.get_node(pos2).name == "homedecor:swing_rope" then
+			local testpos = { x=pos.x, y=pos.y+i+1, z=pos.z }
-			minetest.remove_node(pos2)
+			if minetest.get_node(testpos).name == "homedecor:swing_rope" then
+				minetest.remove_node(testpos)
+			else
+				return
+			end
 		end
 	end
 })
@@ -1819,12 +1863,16 @@ minetest.register_node("homedecor:swing_rope", {
 	drawtype = "nodebox",
 	paramtype = "light",
 	paramtype2 = "facedir",
-	groups = { snappy=3, not_in_creative_inventory=1 },
+	groups = { not_in_creative_inventory=1 },
 	node_box = {
 		type = "fixed",
 		fixed = {
 			{-0.3125, -0.5, 0.025, -0.3, 0.5, 0.0375}, -- NodeBox1
 			{0.3, -0.5, 0.025, 0.3125, 0.5, 0.0375}, -- NodeBox2
 		}
+	},
+	selection_box = {
+		type = "fixed",
+		fixed = { 0, 0, 0, 0, 0, 0 }
 	}
 })