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Diffstat (limited to 'advtrains/trackplacer.lua')
| -rw-r--r-- | advtrains/trackplacer.lua | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/advtrains/trackplacer.lua b/advtrains/trackplacer.lua new file mode 100644 index 0000000..eebf2ae --- /dev/null +++ b/advtrains/trackplacer.lua @@ -0,0 +1,282 @@ +--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 |