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-rw-r--r--advtrains/trackplacer.lua282
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diff --git a/advtrains/trackplacer.lua b/advtrains/trackplacer.lua
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+--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
+ minetest.set_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
+ minetest.set_node(pos, tr.single_conn[newdir])
+ return true
+ end
+ return false
+ end
+end
+function tp.placetrack(pos, nnpref)
+ --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})
+ elseif #p_rails==1 then
+ tp.bend_rail(pos, p_rails[1], nnpref)
+ minetest.set_node(pos, tr.single_conn[p_rails[1]])
+ 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)
+ minetest.set_node(pos, tr.double_conn[conn1.."_"..conn2])
+ return
+ end
+ end
+ end
+ end
+ --not found
+ tp.bend_rail(pos, p_rails[1], nnpref)
+ minetest.set_node(pos, tr.single_conn[p_rails[1]])
+ 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)
+ if not minetest.setting_getbool("creative_mode") then
+ itemstack:take_item()
+ end
+ end
+ end
+ return itemstack
+ end,
+ })
+end
+
+
+
+minetest.register_craftitem("advtrains:trackworker",{
+ description = "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.is_train_at_pos(pos) then return end
+
+ local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
+ --print(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
+ if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
+ nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
+ rotation = ""
+ if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
+ minetest.chat_send_player(placer:get_player_name(), "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
+ minetest.set_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(), "This node can't be rotated using the trackworker!")
+ return
+ end
+ minetest.set_node(pos, {name=nnprefix.."_"..suffix..modext[modpos+1], param2=node.param2})
+ end
+ advtrains.invalidate_all_paths()
+ 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.is_train_at_pos(pos) then return end
+ local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
+ --print(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
+ if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
+ nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
+ rotation = ""
+ if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
+ minetest.chat_send_player(user:get_player_name(), "This node can't be changed using the trackworker!")
+ return
+ end
+ end
+ local nextsuffix=tp.tracks[nnprefix].twcycle[suffix]
+ minetest.set_node(pos, {name=nnprefix.."_"..nextsuffix..rotation, param2=node.param2})
+ --invalidate trains
+ advtrains.invalidate_all_paths()
+ else
+ print(name, dump(tp.tracks))
+ end
+ end,
+})
+
+--putting into right place
+advtrains.trackplacer=tp