300 lines
11 KiB
Lua
300 lines
11 KiB
Lua
--trackplacer.lua
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--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.
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--all new trackplacer code
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local tp={
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tracks={}
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}
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function tp.register_tracktype(nnprefix, n_suffix)
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if tp.tracks[nnprefix] then return end--due to the separate registration of slopes and flats for the same nnpref, definition would be overridden here. just don't.
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tp.tracks[nnprefix]={
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default=n_suffix,
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single_conn={},
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double_conn={},
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--keys:conn1_conn2 (example:1_4)
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--values:{name=x, param2=x}
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twcycle={},
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twrotate={},--indexed by suffix, list, tells order of rotations
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modify={}
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}
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end
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function tp.add_double_conn(nnprefix, suffix, rotation, conns)
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local nodename=nnprefix.."_"..suffix..rotation
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for i=0,3 do
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tp.tracks[nnprefix].double_conn[((conns.conn1+4*i)%16).."_"..((conns.conn2+4*i)%16)]={name=nodename, param2=i}
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tp.tracks[nnprefix].double_conn[((conns.conn2+4*i)%16).."_"..((conns.conn1+4*i)%16)]={name=nodename, param2=i}
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end
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tp.tracks[nnprefix].modify[nodename]=true
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end
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function tp.add_single_conn(nnprefix, suffix, rotation, conns)
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local nodename=nnprefix.."_"..suffix..rotation
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for i=0,3 do
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tp.tracks[nnprefix].single_conn[((conns.conn1+4*i)%16)]={name=nodename, param2=i}
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tp.tracks[nnprefix].single_conn[((conns.conn2+4*i)%16)]={name=nodename, param2=i}
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end
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tp.tracks[nnprefix].modify[nodename]=true
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end
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function tp.add_worked(nnprefix, suffix, rotation, cycle_follows)
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tp.tracks[nnprefix].twcycle[suffix]=cycle_follows
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if not tp.tracks[nnprefix].twrotate[suffix] then tp.tracks[nnprefix].twrotate[suffix]={} end
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table.insert(tp.tracks[nnprefix].twrotate[suffix], rotation)
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end
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--[[
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rewrite algorithm.
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selection criteria: these will never be changed or even selected:
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- tracks being already connected on both sides
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- tracks that are already connected on one side but are not bendable to the desired position
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the following situations can occur:
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1. there are two more than two rails around
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1.1 there is one or more subset(s) that can be directly connected
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-> choose the first possibility
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2.2 not
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-> choose the first one and orient straight
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2. there's exactly 1 rail around
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-> choose and orient straight
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3. there's no rail around
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-> set straight
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]]
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function tp.find_already_connected(pos)--TODO vertical calculations(check node below)
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local function istrackandbc(pos, conn)
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local cnode=minetest.get_node(advtrains.dirCoordSet(pos, conn))
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local bconn=(conn+8)%16
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if advtrains.is_track_and_drives_on(cnode.name, advtrains.all_tracktypes) then
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local cconn1, cconn2=advtrains.get_track_connections(cnode.name, cnode.param2)
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return cconn1==bconn or cconn2==bconn
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end
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return false
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end
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local dnode=minetest.get_node(pos)
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local dconn1, dconn2=advtrains.get_track_connections(dnode.name, dnode.param2)
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local t={[true]="true", [false]="false"}
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if istrackandbc(pos, dconn1) and istrackandbc(pos, dconn2) then return dconn1, dconn2
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elseif istrackandbc(pos, dconn1) then return dconn1
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elseif istrackandbc(pos, dconn2) then return dconn2
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end
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return nil
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end
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function tp.rail_and_can_be_bent(originpos, conn, nnpref)
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local pos=advtrains.dirCoordSet(originpos, conn)
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local newdir=(conn+8)%16
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local node=minetest.get_node(pos)
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local tr=tp.tracks[nnpref]
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if not advtrains.is_track_and_drives_on(node.name, advtrains.all_tracktypes) then
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return false
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end
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--rail at other end?
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local adj1, adj2=tp.find_already_connected(pos)
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if adj1 and adj2 then
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return false--dont destroy existing track
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elseif adj1 and not adj2 then
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if tr.double_conn[adj1.."_"..newdir] then
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return true--if exists, connect new rail and old end
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end
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return false
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else
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if tr.single_conn[newdir] then--just rotate old rail to right orientation
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return true
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end
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return false
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end
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end
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function tp.bend_rail(originpos, conn, nnpref)
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local pos=advtrains.dirCoordSet(originpos, conn)
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local newdir=(conn+8)%16
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local node=minetest.get_node(pos)
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local tr=tp.tracks[nnpref]
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--is rail already connected? no need to bend.
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local conn1, conn2=advtrains.get_track_connections(node.name, node.param2)
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if newdir==conn1 or newdir==conn2 then
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return
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end
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--rail at other end?
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local adj1, adj2=tp.find_already_connected(pos)
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if adj1 and adj2 then
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return false--dont destroy existing track
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elseif adj1 and not adj2 then
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if tr.double_conn[adj1.."_"..newdir] then
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advtrains.ndb.swap_node(pos, tr.double_conn[adj1.."_"..newdir])
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return true--if exists, connect new rail and old end
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end
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return false
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else
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if tr.single_conn[newdir] then--just rotate old rail to right orientation
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advtrains.ndb.swap_node(pos, tr.single_conn[newdir])
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return true
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end
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return false
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end
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end
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function tp.placetrack(pos, nnpref, placer, itemstack, pointed_thing)
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--1. find all rails that are likely to be connected
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local tr=tp.tracks[nnpref]
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local p_rails={}
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for i=0,15 do
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if tp.rail_and_can_be_bent(pos, i, nnpref) then
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p_rails[#p_rails+1]=i
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end
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end
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if #p_rails==0 then
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minetest.set_node(pos, {name=nnpref.."_"..tr.default})
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if minetest.registered_nodes[nnpref.."_"..tr.default] and minetest.registered_nodes[nnpref.."_"..tr.default].after_place_node then
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minetest.registered_nodes[nnpref.."_"..tr.default].after_place_node(pos, placer, itemstack, pointed_thing)
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end
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elseif #p_rails==1 then
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tp.bend_rail(pos, p_rails[1], nnpref)
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advtrains.ndb.swap_node(pos, tr.single_conn[p_rails[1]])
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local nname=tr.single_conn[p_rails[1]].name
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if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
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minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
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end
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else
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--iterate subsets
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for k1, conn1 in ipairs(p_rails) do
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for k2, conn2 in ipairs(p_rails) do
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if k1~=k2 then
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if (tr.double_conn[conn1.."_"..conn2]) then
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tp.bend_rail(pos, conn1, nnpref)
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tp.bend_rail(pos, conn2, nnpref)
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advtrains.ndb.swap_node(pos, tr.double_conn[conn1.."_"..conn2])
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local nname=tr.double_conn[conn1.."_"..conn2].name
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if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
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minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
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end
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return
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end
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end
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end
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end
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--not found
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tp.bend_rail(pos, p_rails[1], nnpref)
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advtrains.ndb.swap_node(pos, tr.single_conn[p_rails[1]])
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local nname=tr.single_conn[p_rails[1]].name
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if minetest.registered_nodes[nname] and minetest.registered_nodes[nname].after_place_node then
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minetest.registered_nodes[nname].after_place_node(pos, placer, itemstack, pointed_thing)
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end
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end
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end
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function tp.register_track_placer(nnprefix, imgprefix, dispname)
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minetest.register_craftitem(nnprefix.."_placer",{
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description = dispname,
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inventory_image = imgprefix.."_placer.png",
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wield_image = imgprefix.."_placer.png",
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groups={},
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on_place = function(itemstack, placer, pointed_thing)
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local name = placer:get_player_name()
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if not name then
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return itemstack
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end
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if pointed_thing.type=="node" then
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local pos=pointed_thing.above
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local upos=vector.subtract(pointed_thing.above, {x=0, y=1, z=0})
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if advtrains.is_protected(pos,name) then
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minetest.record_protection_violation(pos, name)
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return itemstack
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end
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if minetest.registered_nodes[minetest.get_node(pos).name] and minetest.registered_nodes[minetest.get_node(pos).name].buildable_to
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and minetest.registered_nodes[minetest.get_node(upos).name] and minetest.registered_nodes[minetest.get_node(upos).name].walkable then
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tp.placetrack(pos, nnprefix, placer, itemstack, pointed_thing)
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if not minetest.setting_getbool("creative_mode") then
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itemstack:take_item()
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end
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end
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end
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return itemstack
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end,
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})
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end
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minetest.register_craftitem("advtrains:trackworker",{
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description = attrans("Track Worker Tool\n\nLeft-click: change rail type (straight/curve/switch)\nRight-click: rotate rail/bumper/signal/etc."),
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groups = {cracky=1}, -- key=name, value=rating; rating=1..3.
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inventory_image = "advtrains_trackworker.png",
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wield_image = "advtrains_trackworker.png",
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stack_max = 1,
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on_place = function(itemstack, placer, pointed_thing)
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local name = placer:get_player_name()
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if not name then
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return
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end
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if pointed_thing.type=="node" then
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local pos=pointed_thing.under
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if advtrains.is_protected(pos, name) then
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minetest.record_protection_violation(pos, name)
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return
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end
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local node=minetest.get_node(pos)
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--if not advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then return end
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if advtrains.get_train_at_pos(pos) then return end
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local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
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--atprint(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
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if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
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nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
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rotation = ""
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if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
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minetest.chat_send_player(placer:get_player_name(), attrans("This node can't be rotated using the trackworker!"))
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return
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end
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end
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local modext=tp.tracks[nnprefix].twrotate[suffix]
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if rotation==modext[#modext] then --increase param2
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advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..suffix..modext[1], param2=(node.param2+1)%4})
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return
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else
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local modpos
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for k,v in pairs(modext) do if v==rotation then modpos=k end end
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if not modpos then
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minetest.chat_send_player(placer:get_player_name(), attrans("This node can't be rotated using the trackworker!"))
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return
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end
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advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..suffix..modext[modpos+1], param2=node.param2})
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end
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end
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end,
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on_use=function(itemstack, user, pointed_thing)
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local name = user:get_player_name()
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if not name then
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return
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end
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if pointed_thing.type=="node" then
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local pos=pointed_thing.under
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local node=minetest.get_node(pos)
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if advtrains.is_protected(pos, name) then
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minetest.record_protection_violation(pos, name)
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return
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end
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--if not advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then return end
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if advtrains.get_train_at_pos(pos) then return end
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local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
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--atprint(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
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if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
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nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
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rotation = ""
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if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
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minetest.chat_send_player(user:get_player_name(), attrans("This node can't be changed using the trackworker!"))
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return
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end
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end
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local nextsuffix=tp.tracks[nnprefix].twcycle[suffix]
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advtrains.ndb.swap_node(pos, {name=nnprefix.."_"..nextsuffix..rotation, param2=node.param2})
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else
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atprint(name, dump(tp.tracks))
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end
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end,
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})
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--putting into right place
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advtrains.trackplacer=tp
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