From a8bcab584fcef2075ce0b282589723659759930a Mon Sep 17 00:00:00 2001
From: Evert Prants <imsonotsleepy@gmail.com>
Date: Tue, 2 Oct 2018 12:31:42 +0300
Subject: [PATCH] Experimental tunneling focus

---
 crystals.lua                           |  16 ++-
 focuses.lua                            | 153 +++++++++++++++++++++++++
 textures/magicalities_focus_tunnel.png | Bin 0 -> 1923 bytes
 textures/magicalities_void.png         | Bin 0 -> 1069 bytes
 4 files changed, 165 insertions(+), 4 deletions(-)
 create mode 100644 textures/magicalities_focus_tunnel.png
 create mode 100644 textures/magicalities_void.png

diff --git a/crystals.lua b/crystals.lua
index 81fbf61..e417e18 100644
--- a/crystals.lua
+++ b/crystals.lua
@@ -212,13 +212,21 @@ function magicalities.register_crystal(element, description, color)
 		deco_type = "simple",
 		place_on  = "default:stone",
 		sidelen   = 16,
-
 		y_max = -30,
 		y_min = -31000,
-		flags = "all_floors, all_ceilings",
-
-		fill_ratio = 0.0008,
+		flags = "all_ceilings",
+		fill_ratio = 0.0004,
+		decoration = "magicalities:crystal_cluster_"..element,
+	})
 
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on  = "default:stone",
+		sidelen   = 16,
+		y_max = -30,
+		y_min = -31000,
+		flags = "all_floors",
+		fill_ratio = 0.0004,
 		decoration = "magicalities:crystal_cluster_"..element,
 	})
 
diff --git a/focuses.lua b/focuses.lua
index 5c8fc80..e4faee6 100644
--- a/focuses.lua
+++ b/focuses.lua
@@ -113,3 +113,156 @@ minetest.register_craftitem("magicalities:focus_swap", {
 		return itemstack
 	end
 })
+
+
+local tunneler_memory = {}
+local tunneler_depth  = 8
+
+local function reset_tunnel(tid)
+	local infos = tunneler_memory['t' .. tid]
+	if not infos then return end
+
+	local manip = minetest.get_voxel_manip()
+	local e1, e2 = manip:read_from_map(infos.minp, infos.maxp)
+	local area = VoxelArea:new{MinEdge=e1, MaxEdge=e2}
+
+	local data = manip:get_data()
+
+	for i in area:iterp(infos.minp, infos.maxp) do
+		if infos.data[i] ~= nil then
+			data[i] = infos.data[i]
+		end
+	end
+
+	manip:set_data(data)
+	manip:write_to_map()
+
+	tunneler_memory['t' .. tid] = nil
+
+	t = false
+end
+
+local function create_tunnel(pos, dir, owner)
+	-- Ensure no double tunnels
+	for id,data in pairs(tunneler_memory) do
+		if data.owner == owner then
+			return
+		end
+	end
+
+	local minp
+	local maxp
+
+	if dir.x < 0 or dir.y < 0 or dir.z < 0 then
+		maxp = vector.add(pos, dir)
+		minp = vector.add(pos, vector.multiply(dir, tunneler_depth))
+	else
+		minp = vector.add(pos, dir)
+		maxp = vector.add(pos, vector.multiply(dir, tunneler_depth))
+	end
+
+	if dir.z ~= 0 then
+		minp.x = minp.x + -1
+		maxp.x = maxp.x + 1
+
+		minp.y = minp.y + -1
+		maxp.y = maxp.y + 1
+	end
+
+	if dir.y ~= 0 then
+		minp.z = minp.z + -1
+		maxp.z = maxp.z + 1
+
+		minp.x = minp.x + -1
+		maxp.x = maxp.x + 1
+	end
+
+	if dir.x ~= 0 then
+		minp.z = minp.z + -1
+		maxp.z = maxp.z + 1
+
+		minp.y = minp.y + -1
+		maxp.y = maxp.y + 1
+	end
+
+	-- Set the nodes
+	local manip = minetest.get_voxel_manip()
+	local e1, e2 = manip:read_from_map(minp, maxp)
+	local area = VoxelArea:new{MinEdge=e1, MaxEdge=e2}
+
+	local data = manip:get_data()
+
+	local c_air = minetest.get_content_id("air")
+	local c_tunnel = minetest.get_content_id("magicalities:tunnel_node")
+	local dtree = {}
+	local abort = false
+
+	for i in area:iterp(minp, maxp) do
+		if data[i] ~= c_air then
+			dtree[i] = data[i]
+			data[i] = c_tunnel
+		elseif data[i] == c_tunnel then
+			abort = true
+			break
+		end
+	end
+
+	if abort then return end
+
+	-- Set nodes in map
+	manip:set_data(data)
+	manip:write_to_map()
+
+	-- Save in cache
+	local cnum = math.random(10, 1000)
+	local comp1 = math.random(10, 1000)
+	local comp2 = math.random(10, 1000)
+	cnum = (math.ceil(comp2 + comp1 / cnum) + cnum)
+
+	tunneler_memory['t' .. cnum] = {
+		data  = dtree,
+		minp  = minp,
+		maxp  = maxp,
+		owner = owner,
+	}
+
+	minetest.after(10, reset_tunnel, cnum)
+end
+
+minetest.register_node("magicalities:tunnel_node", {
+	groups    = {not_in_creative_inventory = 1},
+	walkable  = false,
+	pointable = false,
+	diggable  = false,
+	drawtype  = "glasslike_framed",
+	paramtype = "light",
+	sunlight_propagates = true,
+	tiles     = {"magicalities_void.png"},
+})
+
+minetest.register_craftitem("magicalities:focus_tunnel", {
+	description = "Wand Focus of Tunneling",
+	groups = {wand_focus = 1},
+	inventory_image = "magicalities_focus_tunnel.png",
+	stack_max = 1,
+	_wand_requirements = {
+		["air"] = 1
+	},
+	_wand_use = function (itemstack, user, pointed_thing)
+		if not pointed_thing.above or pointed_thing.type ~= "node" then return itemstack end
+		if not user or user:get_player_name() == "" then return itemstack end
+		local dir = user:get_look_dir()
+		local wm  = minetest.dir_to_wallmounted(dir)
+		dir = minetest.wallmounted_to_dir(wm)
+
+		minetest.after(0.1, create_tunnel, pointed_thing.above, dir, user:get_player_name())
+
+		return itemstack
+	end
+})
+
+minetest.register_on_shutdown(function ()
+	for id in pairs(tunneler_memory) do
+		reset_tunnel(id)
+	end
+end)
diff --git a/textures/magicalities_focus_tunnel.png b/textures/magicalities_focus_tunnel.png
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