mirror of
https://github.com/minetest-mods/mesecons.git
synced 2024-12-25 09:50:19 +01:00
286 lines
8.3 KiB
Lua
286 lines
8.3 KiB
Lua
--register stoppers for movestones/pistons
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mesecon.mvps_stoppers = {}
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mesecon.on_mvps_move = {}
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mesecon.mvps_unmov = {}
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--- Objects (entities) that cannot be moved
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function mesecon.register_mvps_unmov(objectname)
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mesecon.mvps_unmov[objectname] = true;
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end
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function mesecon.is_mvps_unmov(objectname)
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return mesecon.mvps_unmov[objectname]
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end
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-- Nodes that cannot be pushed / pulled by movestones, pistons
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function mesecon.is_mvps_stopper(node, pushdir, stack, stackid)
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-- unknown nodes are always stoppers
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if not minetest.registered_nodes[node.name] then
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return true
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end
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local get_stopper = mesecon.mvps_stoppers[node.name]
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if type (get_stopper) == "function" then
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get_stopper = get_stopper(node, pushdir, stack, stackid)
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end
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return get_stopper
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end
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function mesecon.register_mvps_stopper(nodename, get_stopper)
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if get_stopper == nil then
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get_stopper = true
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end
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mesecon.mvps_stoppers[nodename] = get_stopper
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end
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-- Functions to be called on mvps movement
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function mesecon.register_on_mvps_move(callback)
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mesecon.on_mvps_move[#mesecon.on_mvps_move+1] = callback
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end
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local function on_mvps_move(moved_nodes)
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for _, callback in ipairs(mesecon.on_mvps_move) do
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callback(moved_nodes)
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end
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end
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function mesecon.mvps_process_stack(stack)
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-- update mesecons for placed nodes ( has to be done after all nodes have been added )
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for _, n in ipairs(stack) do
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mesecon.on_placenode(n.pos, minetest.get_node(n.pos))
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end
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end
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-- tests if the node can be pushed into, e.g. air, water, grass
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local function node_replaceable(name)
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if minetest.registered_nodes[name] then
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return minetest.registered_nodes[name].buildable_to or false
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end
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return false
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end
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function mesecon.mvps_get_stack(pos, dir, maximum, all_pull_sticky)
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-- determine the number of nodes to be pushed
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local nodes = {}
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local frontiers = {pos}
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while #frontiers > 0 do
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local np = frontiers[1]
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local nn = minetest.get_node(np)
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if not node_replaceable(nn.name) then
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table.insert(nodes, {node = nn, pos = np})
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if #nodes > maximum then return nil end
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-- add connected nodes to frontiers, connected is a vector list
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-- the vectors must be absolute positions
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local connected = {}
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if minetest.registered_nodes[nn.name]
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and minetest.registered_nodes[nn.name].mvps_sticky then
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connected = minetest.registered_nodes[nn.name].mvps_sticky(np, nn)
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end
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table.insert(connected, vector.add(np, dir))
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-- If adjacent node is sticky block and connects add that
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-- position to the connected table
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for _, r in ipairs(mesecon.rules.alldirs) do
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local adjpos = vector.add(np, r)
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local adjnode = minetest.get_node(adjpos)
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if minetest.registered_nodes[adjnode.name]
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and minetest.registered_nodes[adjnode.name].mvps_sticky then
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local sticksto = minetest.registered_nodes[adjnode.name]
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.mvps_sticky(adjpos, adjnode)
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-- connects to this position?
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for _, link in ipairs(sticksto) do
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if vector.equals(link, np) then
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table.insert(connected, adjpos)
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end
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end
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end
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end
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if all_pull_sticky then
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table.insert(connected, vector.subtract(np, dir))
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end
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-- Make sure there are no duplicates in frontiers / nodes before
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-- adding nodes in "connected" to frontiers
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for _, cp in ipairs(connected) do
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local duplicate = false
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for _, rp in ipairs(nodes) do
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if vector.equals(cp, rp.pos) then
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duplicate = true
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end
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end
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for _, fp in ipairs(frontiers) do
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if vector.equals(cp, fp) then
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duplicate = true
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end
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end
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if not duplicate then
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table.insert(frontiers, cp)
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end
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end
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end
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table.remove(frontiers, 1)
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end
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return nodes
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end
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function mesecon.mvps_push(pos, dir, maximum)
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return mesecon.mvps_push_or_pull(pos, dir, dir, maximum)
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end
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function mesecon.mvps_pull_all(pos, dir, maximum)
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return mesecon.mvps_push_or_pull(pos, vector.multiply(dir, -1), dir, maximum, true)
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end
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function mesecon.mvps_pull_single(pos, dir, maximum)
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return mesecon.mvps_push_or_pull(pos, vector.multiply(dir, -1), dir, maximum)
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end
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-- pos: pos of mvps; stackdir: direction of building the stack
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-- movedir: direction of actual movement
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-- maximum: maximum nodes to be pushed
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-- all_pull_sticky: All nodes are sticky in the direction that they are pulled from
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function mesecon.mvps_push_or_pull(pos, stackdir, movedir, maximum, all_pull_sticky)
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local nodes = mesecon.mvps_get_stack(pos, movedir, maximum, all_pull_sticky)
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if not nodes then return end
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-- determine if one of the nodes blocks the push / pull
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for id, n in ipairs(nodes) do
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if mesecon.is_mvps_stopper(n.node, movedir, nodes, id) then
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return
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end
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end
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-- remove all nodes
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for _, n in ipairs(nodes) do
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n.meta = minetest.get_meta(n.pos):to_table()
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local node_timer = minetest.get_node_timer(n.pos)
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if node_timer:is_started() then
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n.node_timer = {node_timer:get_timeout(), node_timer:get_elapsed()}
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end
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minetest.remove_node(n.pos)
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end
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-- update mesecons for removed nodes ( has to be done after all nodes have been removed )
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for _, n in ipairs(nodes) do
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mesecon.on_dignode(n.pos, n.node)
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end
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-- add nodes
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for _, n in ipairs(nodes) do
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local np = vector.add(n.pos, movedir)
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minetest.set_node(np, n.node)
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minetest.get_meta(np):from_table(n.meta)
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if n.node_timer then
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minetest.get_node_timer(np):set(unpack(n.node_timer))
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end
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end
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local moved_nodes = {}
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local oldstack = mesecon.tablecopy(nodes)
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for i in ipairs(nodes) do
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moved_nodes[i] = {}
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moved_nodes[i].oldpos = nodes[i].pos
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nodes[i].pos = vector.add(nodes[i].pos, movedir)
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moved_nodes[i].pos = nodes[i].pos
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moved_nodes[i].node = nodes[i].node
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moved_nodes[i].meta = nodes[i].meta
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moved_nodes[i].node_timer = nodes[i].node_timer
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end
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on_mvps_move(moved_nodes)
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return true, nodes, oldstack
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end
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function mesecon.mvps_move_objects(pos, dir, nodestack, movefactor)
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local objects_to_move = {}
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local dir_k
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local dir_l
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for k, v in pairs(dir) do
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if v ~= 0 then
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dir_k = k
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dir_l = v
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break
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end
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end
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movefactor = movefactor or 1
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dir = vector.multiply(dir, movefactor)
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for id, obj in pairs(minetest.object_refs) do
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local obj_pos = obj:get_pos()
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local cbox = obj:get_properties().collisionbox
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local min_pos = vector.add(obj_pos, vector.new(cbox[1], cbox[2], cbox[3]))
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local max_pos = vector.add(obj_pos, vector.new(cbox[4], cbox[5], cbox[6]))
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local ok = true
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for k, v in pairs(pos) do
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local edge1, edge2
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if k ~= dir_k then
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edge1 = v - 0.51 -- More than 0.5 to move objects near to the stack.
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edge2 = v + 0.51
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else
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edge1 = v - 0.5 * dir_l
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edge2 = v + (#nodestack + 0.5 * movefactor) * dir_l
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-- Make sure, edge1 is bigger than edge2:
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if edge1 > edge2 then
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edge1, edge2 = edge2, edge1
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end
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end
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if min_pos[k] > edge2 or max_pos[k] < edge1 then
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ok = false
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break
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end
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end
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if ok then
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local ent = obj:get_luaentity()
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if obj:is_player() or (ent and not mesecon.is_mvps_unmov(ent.name)) then
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local np = vector.add(obj_pos, dir)
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-- Move only if destination is not solid or object is inside stack:
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local nn = minetest.get_node(np)
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local node_def = minetest.registered_nodes[nn.name]
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local obj_offset = dir_l * (obj_pos[dir_k] - pos[dir_k])
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if (node_def and not node_def.walkable) or
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(obj_offset >= 0 and
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obj_offset <= #nodestack - 0.5) then
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obj:move_to(np)
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end
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end
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end
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end
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end
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-- Never push into unloaded blocks. Don’t try to pull from them, either.
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-- TODO: load blocks instead, as with wires.
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mesecon.register_mvps_stopper("ignore")
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mesecon.register_mvps_stopper("doors:door_steel_b_1")
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mesecon.register_mvps_stopper("doors:door_steel_t_1")
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mesecon.register_mvps_stopper("doors:door_steel_b_2")
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mesecon.register_mvps_stopper("doors:door_steel_t_2")
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mesecon.register_mvps_stopper("default:chest_locked")
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mesecon.register_on_mvps_move(mesecon.move_hot_nodes)
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mesecon.register_on_mvps_move(function(moved_nodes)
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for i = 1, #moved_nodes do
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local moved_node = moved_nodes[i]
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mesecon.on_placenode(moved_node.pos, moved_node.node)
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minetest.after(0, function()
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minetest.check_for_falling(moved_node.oldpos)
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minetest.check_for_falling(moved_node.pos)
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end)
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local node_def = minetest.registered_nodes[moved_node.node.name]
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if node_def and node_def.mesecon and node_def.mesecon.on_mvps_move then
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node_def.mesecon.on_mvps_move(moved_node.pos, moved_node.node,
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moved_node.oldpos, moved_node.meta)
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end
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end
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end)
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