aboutsummaryrefslogtreecommitdiff
path: root/advtrains/advtrains/trackplacer.lua
blob: 9fee01150ec07d8f9251abd085316f9e87e0a4c7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
--trackplacer.lua
--holds code for the track-placing system. the default 'track' item will be a craftitem that places rails as needed. this will neither place or change switches nor place vertical rails.

--all new trackplacer code
local tp={
	tracks={}
}

function tp.register_tracktype(nnprefix, n_suffix)
	tp.tracks[nnprefix]={
		default=n_suffix,
		single_conn={},
		double_conn={},
		--keys:conn1_conn2 (example:1_4)
		--values:{name=x, param2=x}
		twcycle={},
		twrotate={},--indexed by suffix, list, tells order of rotations
		modify={}
	}
end
function tp.add_double_conn(nnprefix, suffix, rotation, conns)
	local nodename=nnprefix.."_"..suffix..rotation
	for i=0,3 do
		tp.tracks[nnprefix].double_conn[((conns.conn1+4*i)%16).."_"..((conns.conn2+4*i)%16)]={name=nodename, param2=i}
		tp.tracks[nnprefix].double_conn[((conns.conn2+4*i)%16).."_"..((conns.conn1+4*i)%16)]={name=nodename, param2=i}
	end
	tp.tracks[nnprefix].modify[nodename]=true
end
function tp.add_single_conn(nnprefix, suffix, rotation, conns)
	local nodename=nnprefix.."_"..suffix..rotation
	for i=0,3 do
		tp.tracks[nnprefix].single_conn[((conns.conn1+4*i)%16)]={name=nodename, param2=i}
		tp.tracks[nnprefix].single_conn[((conns.conn2+4*i)%16)]={name=nodename, param2=i}
	end
	tp.tracks[nnprefix].modify[nodename]=true
end

function tp.add_worked(nnprefix, suffix, rotation, cycle_follows)
	tp.tracks[nnprefix].twcycle[suffix]=cycle_follows
	if not tp.tracks[nnprefix].twrotate[suffix] then tp.tracks[nnprefix].twrotate[suffix]={} end
	table.insert(tp.tracks[nnprefix].twrotate[suffix], rotation)
end


--[[
	rewrite algorithm.
	selection criteria: these will never be changed or even selected:
	- tracks being already connected on both sides
	- tracks that are already connected on one side but are not bendable to the desired position
	the following situations can occur:
	1. there are two more than two rails around
		1.1 there is one or more subset(s) that can be directly connected
			-> choose the first possibility
		2.2 not
			-> choose the first one and orient straight
	2. there's exactly 1 rail around
		-> choose and orient straight
	3. there's no rail around
		-> set straight
]]
function tp.find_already_connected(pos)--TODO vertical calculations(check node below)
	local function istrackandbc(pos, conn)
		local cnode=minetest.get_node(advtrains.dirCoordSet(pos, conn))
		local bconn=(conn+8)%16
		if advtrains.is_track_and_drives_on(cnode.name, advtrains.all_tracktypes) then
			local cconn1, cconn2=advtrains.get_track_connections(cnode.name, cnode.param2)
			return cconn1==bconn or cconn2==bconn
		end
		return false
	end
	local dnode=minetest.get_node(pos)
	local dconn1, dconn2=advtrains.get_track_connections(dnode.name, dnode.param2)
	local t={[true]="true", [false]="false"}
	if istrackandbc(pos, dconn1) and istrackandbc(pos, dconn2) then return dconn1, dconn2
	elseif istrackandbc(pos, dconn1) then return dconn1
	elseif istrackandbc(pos, dconn2) then return dconn2
	end
	return nil
end
function tp.rail_and_can_be_bent(originpos, conn, nnpref)
	local pos=advtrains.dirCoordSet(originpos, conn)
	local newdir=(conn+8)%16
	local node=minetest.get_node(pos)
	local tr=tp.tracks[nnpref]
	if not advtrains.is_track_and_drives_on(node.name, advtrains.all_tracktypes) then
		return false
	end
	--rail at other end?
	local adj1, adj2=tp.find_already_connected(pos)
	if adj1 and adj2 then
		return false--dont destroy existing track
	elseif adj1 and not adj2 then
		if tr.double_conn[adj1.."_"..newdir] then
			return true--if exists, connect new rail and old end
		end
		return false
	else
		if tr.single_conn[newdir] then--just rotate old rail to right orientation
			return true
		end
		return false
	end
end
function tp.bend_rail(originpos, conn, nnpref)
	local pos=advtrains.dirCoordSet(originpos, conn)
	local newdir=(conn+8)%16
	local node=minetest.get_node(pos)
	local tr=tp.tracks[nnpref]
	--is rail already connected? no need to bend.
	local conn1, conn2=advtrains.get_track_connections(node.name, node.param2)
	if newdir==conn1 or newdir==conn2 then
		return
	end
	--rail at other end?
	local adj1, adj2=tp.find_already_connected(pos)
	if adj1 and adj2 then
		return false--dont destroy existing track
	elseif adj1 and not adj2 then
		if tr.double_conn[adj1.."_"..newdir] then
			advtrains.ndb.swap_node(pos, tr.double_conn[adj1.."_"..newdir])
			return true--if exists, connect new rail and old end
		end
		return false
	else
		if tr.single_conn[newdir] then--just rotate old rail to right orientation
			advtrains.ndb.swap_node(pos, tr.single_conn[newdir])
			return true
		end
		return false
	end
end
function tp.placetrack(pos, nnpref, placer, itemstack, pointed_thing)
	--1. find all rails that are likely to be connected
	local tr=tp.tracks[nnpref]
	local p_rails={}
	for i=0,15 do
		if tp.rail_and_can_be_bent(pos, i, nnpref) then
			p_rails[#p_rails+1]=i
		end
	end
	if #p_rails==0 then
		minetest.set_node(pos, {name=nnpref.."_"..tr.default})
		if minetest.registered_nodes[nnpref.."_"..tr.default] and minetest.registered_nodes[nnpref.."_"..tr.default].after_place_node then
			minetest.registered_nodes[nnpref.."_"..tr.default].after_place_node(pos, placer, itemstack, pointed_thing)
		end
	elseif #p_rails==1 then
		tp.bend_rail(pos, p_rails[1], nnpref)
		advtrains.ndb.swap_node(pos, tr.single_conn[p_rails[1]])
		local nname=tr.single_conn[p_rails[1]].name
		if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
			minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
		end
	else
		--iterate subsets
		for k1, conn1 in ipairs(p_rails) do
			for k2, conn2 in ipairs(p_rails) do
				if k1~=k2 then
					if (tr.double_conn[conn1.."_"..conn2]) then
						tp.bend_rail(pos, conn1, nnpref)
						tp.bend_rail(pos, conn2, nnpref)
						advtrains.ndb.swap_node(pos, tr.double_conn[conn1.."_"..conn2])
						local nname=tr.double_conn[conn1.."_"..conn2].name
						if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
							minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
						end
						return
					end
				end
			end
		end
		--not found
		tp.bend_rail(pos, p_rails[1], nnpref)
		advtrains.ndb.swap_node(pos, tr.single_conn[p_rails[1]])
		local nname=tr.single_conn[p_rails[1]].name
		if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
			minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
		end
	end
end


function tp.register_track_placer(nnprefix, imgprefix, dispname)
	minetest.register_craftitem(nnprefix.."_placer",{
		description = dispname,
		inventory_image = imgprefix.."_placer.png",
		wield_image = imgprefix.."_placer.png",
		groups={},
		on_place = function(itemstack, placer, pointed_thing)
		        local name = placer:get_player_name()
			if not name then
			   return itemstack
			end
			if pointed_thing.type=="node" then
				local pos=pointed_thing.above
				local upos=pointed_thing.under
				if minetest.is_protected(pos,name) and minetest.is_protected(upos,name) then
				   return itemstack
				end
				if minetest.registered_nodes[minetest.get_node(pos).name] and minetest.registered_nodes[minetest.get_node(pos).name].buildable_to
					and minetest.registered_nodes[minetest.get_node(upos).name] and minetest.registered_nodes[minetest.get_node(upos).name].walkable then
					tp.placetrack(pos, nnprefix, placer, itemstack, pointed_thing)
					if not minetest.setting_getbool("creative_mode") then
						itemstack:take_item()
					end
				end
			end
			return itemstack
		end,
	})
end



minetest.register_craftitem("advtrains:trackworker",{
	description = attrans("Track Worker Tool\n\nLeft-click: change rail type (straight/curve/switch)\nRight-click: rotate rail/bumper/signal/etc."),
	groups = {cracky=1}, -- key=name, value=rating; rating=1..3.
	inventory_image = "advtrains_trackworker.png",
	wield_image = "advtrains_trackworker.png",
	stack_max = 1,
	on_place = function(itemstack, placer, pointed_thing)
		local name = placer:get_player_name()
		if not name then
			return
		end
		if pointed_thing.type=="node" then
			local pos=pointed_thing.under
			if minetest.is_protected(pos, name) then
				return
			end
			local node=minetest.get_node(pos)

			--if not advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then return end
			if advtrains.get_train_at_pos(pos) then return end

			local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
			--atprint(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
			if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
				nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
				rotation = ""
				if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
					minetest.chat_send_player(placer:get_player_name(), attrans("This node can't be rotated using the trackworker!"))
					return
				end
			end
			local modext=tp.tracks[nnprefix].twrotate[suffix]

			if rotation==modext[#modext] then --increase param2
				advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..suffix..modext[1], param2=(node.param2+1)%4})
				return
			else
				local modpos
				for k,v in pairs(modext) do if v==rotation then modpos=k end end
					if not modpos then
						minetest.chat_send_player(placer:get_player_name(), attrans("This node can't be rotated using the trackworker!"))
					return
				end
				advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..suffix..modext[modpos+1], param2=node.param2})
			end
		end
	end,
	on_use=function(itemstack, user, pointed_thing)
	        local name = user:get_player_name()
		if not name then
		   return
		end
		if pointed_thing.type=="node" then
			local pos=pointed_thing.under
			local node=minetest.get_node(pos)
			if minetest.is_protected(pos, name) then
			   return
			end
			
			--if not advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then return end
			if advtrains.get_train_at_pos(pos) then return end
			local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
	        --atprint(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
		    if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
			  nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
			  rotation = ""
			  if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
			    minetest.chat_send_player(user:get_player_name(), attrans("This node can't be changed using the trackworker!"))
			    return
			  end
		    end
			local nextsuffix=tp.tracks[nnprefix].twcycle[suffix]
			advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..nextsuffix..rotation, param2=node.param2})
			
		else
			atprint(name, dump(tp.tracks))
		end
	end,
})

--putting into right place
advtrains.trackplacer=tp