summaryrefslogtreecommitdiff
path: root/mesecons_mvps/init.lua
blob: 1707408fd49ff7dc0e2752fa16da5859a9fc94f7 (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
--register stoppers for movestones/pistons

mesecon.mvps_stoppers = {}
mesecon.on_mvps_move = {}
mesecon.mvps_unmov = {}

--- Objects (entities) that cannot be moved
function mesecon.register_mvps_unmov(objectname)
	mesecon.mvps_unmov[objectname] = true;
end

function mesecon.is_mvps_unmov(objectname)
	return mesecon.mvps_unmov[objectname]
end

-- Nodes that cannot be pushed / pulled by movestones, pistons
function mesecon.is_mvps_stopper(node, pushdir, stack, stackid)
	-- unknown nodes are always stoppers
	if not minetest.registered_nodes[node.name] then
		return true
	end

	local get_stopper = mesecon.mvps_stoppers[node.name]
	if type (get_stopper) == "function" then
		get_stopper = get_stopper(node, pushdir, stack, stackid)
	end

	return get_stopper
end

function mesecon.register_mvps_stopper(nodename, get_stopper)
	if get_stopper == nil then
			get_stopper = true
	end
	mesecon.mvps_stoppers[nodename] = get_stopper
end

-- Functions to be called on mvps movement
function mesecon.register_on_mvps_move(callback)
	mesecon.on_mvps_move[#mesecon.on_mvps_move+1] = callback
end

local function on_mvps_move(moved_nodes)
	for _, callback in ipairs(mesecon.on_mvps_move) do
		callback(moved_nodes)
	end
end

function mesecon.mvps_process_stack(stack)
	-- update mesecons for placed nodes ( has to be done after all nodes have been added )
	for _, n in ipairs(stack) do
		mesecon.on_placenode(n.pos, minetest.get_node(n.pos))
	end
end

-- tests if the node can be pushed into, e.g. air, water, grass
local function node_replaceable(name)
	if name == "ignore" then return true end

	if minetest.registered_nodes[name] then
		return minetest.registered_nodes[name].buildable_to or false
	end

	return false
end

function mesecon.mvps_get_stack(pos, dir, maximum, all_pull_sticky)
	-- determine the number of nodes to be pushed
	local nodes = {}
	local frontiers = {pos}

	while #frontiers > 0 do
		local np = frontiers[1]
		local nn = minetest.get_node(np)

		if not node_replaceable(nn.name) then
			table.insert(nodes, {node = nn, pos = np})
			if #nodes > maximum then return nil end

			-- add connected nodes to frontiers, connected is a vector list
			-- the vectors must be absolute positions
			local connected = {}
			if minetest.registered_nodes[nn.name]
			and minetest.registered_nodes[nn.name].mvps_sticky then
				connected = minetest.registered_nodes[nn.name].mvps_sticky(np, nn)
			end

			table.insert(connected, vector.add(np, dir))

			-- If adjacent node is sticky block and connects add that
			-- position to the connected table
			for _, r in ipairs(mesecon.rules.alldirs) do
				local adjpos = vector.add(np, r)
				local adjnode = minetest.get_node(adjpos)
				if minetest.registered_nodes[adjnode.name]
				and minetest.registered_nodes[adjnode.name].mvps_sticky then
					local sticksto = minetest.registered_nodes[adjnode.name]
						.mvps_sticky(adjpos, adjnode)

					-- connects to this position?
					for _, link in ipairs(sticksto) do
						if vector.equals(link, np) then
							table.insert(connected, adjpos)
						end
					end
				end
			end

			if all_pull_sticky then
				table.insert(connected, vector.subtract(np, dir))
			end

			-- Make sure there are no duplicates in frontiers / nodes before
			-- adding nodes in "connected" to frontiers
			for _, cp in ipairs(connected) do
				local duplicate = false
				for _, rp in ipairs(nodes) do
					if vector.equals(cp, rp.pos) then
						duplicate = true
					end
				end
				for _, fp in ipairs(frontiers) do
					if vector.equals(cp, fp) then
						duplicate = true
					end
				end
				if not duplicate then
					table.insert(frontiers, cp)
				end
			end
		end
		table.remove(frontiers, 1)
	end

	return nodes
end

function mesecon.mvps_push(pos, dir, maximum)
	return mesecon.mvps_push_or_pull(pos, dir, dir, maximum)
end

function mesecon.mvps_pull_all(pos, dir, maximum)
	return mesecon.mvps_push_or_pull(pos, vector.multiply(dir, -1), dir, maximum, true)
end

function mesecon.mvps_pull_single(pos, dir, maximum)
	return mesecon.mvps_push_or_pull(pos, vector.multiply(dir, -1), dir, maximum)
end

-- pos: pos of mvps; stackdir: direction of building the stack
-- movedir: direction of actual movement
-- maximum: maximum nodes to be pushed
-- all_pull_sticky: All nodes are sticky in the direction that they are pulled from
function mesecon.mvps_push_or_pull(pos, stackdir, movedir, maximum, all_pull_sticky)
	local nodes = mesecon.mvps_get_stack(pos, movedir, maximum, all_pull_sticky)

	if not nodes then return end
	-- determine if one of the nodes blocks the push / pull
	for id, n in ipairs(nodes) do
		if mesecon.is_mvps_stopper(n.node, movedir, nodes, id) then
			return
		end
	end

	-- remove all nodes
	for _, n in ipairs(nodes) do
		n.meta = minetest.get_meta(n.pos):to_table()
		minetest.remove_node(n.pos)
	end

	-- update mesecons for removed nodes ( has to be done after all nodes have been removed )
	for _, n in ipairs(nodes) do
		mesecon.on_dignode(n.pos, n.node)
	end

	-- add nodes
	for _, n in ipairs(nodes) do
		local np = vector.add(n.pos, movedir)

		minetest.set_node(np, n.node)
		minetest.get_meta(np):from_table(n.meta)
	end

	local moved_nodes = {}
	local oldstack = mesecon.tablecopy(nodes)
	for i in ipairs(nodes) do
		moved_nodes[i] = {}
		moved_nodes[i].oldpos = nodes[i].pos
		nodes[i].pos = vector.add(nodes[i].pos, movedir)
		moved_nodes[i].pos = nodes[i].pos
		moved_nodes[i].node = nodes[i].node
		moved_nodes[i].meta = nodes[i].meta
	end

	on_mvps_move(moved_nodes)

	return true, nodes, oldstack
end

mesecon.register_on_mvps_move(function(moved_nodes)
	for _, n in ipairs(moved_nodes) do
		mesecon.on_placenode(n.pos, n.node)
		mesecon.update_autoconnect(n.pos)
	end
end)

function mesecon.mvps_move_objects(pos, dir, nodestack)
	local objects_to_move = {}

	-- Move object at tip of stack, pushpos is position at tip of stack
	local pushpos = vector.add(pos, vector.multiply(dir, #nodestack))

	local objects = minetest.get_objects_inside_radius(pushpos, 1)
	for _, obj in ipairs(objects) do
		table.insert(objects_to_move, obj)
	end

	-- Move objects lying/standing on the stack (before it was pushed - oldstack)
	if tonumber(minetest.setting_get("movement_gravity")) > 0 and dir.y == 0 then
		-- If gravity positive and dir horizontal, push players standing on the stack
		for _, n in ipairs(nodestack) do
			local p_above = vector.add(n.pos, {x=0, y=1, z=0})
			local objects = minetest.get_objects_inside_radius(p_above, 1)
			for _, obj in ipairs(objects) do
				table.insert(objects_to_move, obj)
			end
		end
	end

	for _, obj in ipairs(objects_to_move) do
		local entity = obj:get_luaentity()
		if not entity or not mesecon.is_mvps_unmov(entity.name) then
			local np = vector.add(obj:getpos(), dir)

			--move only if destination is not solid
			local nn = minetest.get_node(np)
			if not ((not minetest.registered_nodes[nn.name])
			or minetest.registered_nodes[nn.name].walkable) then
				obj:setpos(np)
			end
		end
	end
end

mesecon.register_mvps_stopper("doors:door_steel_b_1")
mesecon.register_mvps_stopper("doors:door_steel_t_1")
mesecon.register_mvps_stopper("doors:door_steel_b_2")
mesecon.register_mvps_stopper("doors:door_steel_t_2")
mesecon.register_mvps_stopper("default:chest_locked")