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---trainlogic.lua
---controls train entities stuff about connecting/disconnecting/colliding trains and other things
-
---local print=function(t, ...) minetest.log("action", table.concat({t, ...}, " ")) minetest.chat_send_all(table.concat({t, ...}, " ")) end
-local print=function() end
-
-local benchmark=false
---printbm=function(str, t) print("[advtrains]"..str.." "..((os.clock()-t)*1000).."ms") end
-local bm={}
-local bmlt=0
-local bmsteps=0
-local bmstepint=200
-printbm=function(action, ta)
- if not benchmark then return end
- local t=(os.clock()-ta)*1000
- if not bm[action] then
- bm[action]=t
- else
- bm[action]=bm[action]+t
- end
- bmlt=bmlt+t
-end
-function endstep()
- if not benchmark then return end
- bmsteps=bmsteps-1
- if bmsteps<=0 then
- bmsteps=bmstepint
- for key, value in pairs(bm) do
- minetest.chat_send_all(key.." "..(value/bmstepint).." ms avg.")
- end
- minetest.chat_send_all("Total time consumed by all advtrains actions per step: "..(bmlt/bmstepint).." ms avg.")
- bm={}
- bmlt=0
- end
-end
-
---TODO: these values need to be integrated when i remove traintypes.
-advtrains.train_accel_force=2--per second and divided by number of wagons
-advtrains.train_brake_force=3--per second, not divided by number of wagons
-advtrains.train_roll_force=0.5--per second, not divided by number of wagons, acceleration when rolling without brake
-advtrains.train_emerg_force=10--for emergency brakes(when going off track)
-
-advtrains.audit_interval=30
-
-advtrains.all_traintypes={}
-function advtrains.register_train_type(name, drives_on, max_speed)
- advtrains.all_traintypes[name]={}
- advtrains.all_traintypes[name].drives_on=drives_on
- advtrains.all_traintypes[name].max_speed=max_speed or 10
-end
-
-
-advtrains.trains={}
-advtrains.wagon_save={}
-
---load initially
-advtrains.fpath=minetest.get_worldpath().."/advtrains"
-local file, err = io.open(advtrains.fpath, "r")
-if not file then
- local er=err or "Unknown Error"
- print("[advtrains]Failed loading advtrains save file "..er)
-else
- local tbl = minetest.deserialize(file:read("*a"))
- if type(tbl) == "table" then
- advtrains.trains=tbl
- end
- file:close()
-end
-advtrains.fpath_ws=minetest.get_worldpath().."/advtrains_wagon_save"
-local file, err = io.open(advtrains.fpath_ws, "r")
-if not file then
- local er=err or "Unknown Error"
- print("[advtrains]Failed loading advtrains save file "..er)
-else
- local tbl = minetest.deserialize(file:read("*a"))
- if type(tbl) == "table" then
- advtrains.wagon_save=tbl
- end
- file:close()
-end
-
-
-advtrains.save = function()
- --print("[advtrains]saving")
- advtrains.invalidate_all_paths()
- local datastr = minetest.serialize(advtrains.trains)
- if not datastr then
- minetest.log("error", "[advtrains] Failed to serialize train data!")
- return
- end
- local file, err = io.open(advtrains.fpath, "w")
- if err then
- return err
- end
- file:write(datastr)
- file:close()
-
- -- update wagon saves
- for _,wagon in pairs(minetest.luaentities) do
- if wagon.is_wagon and wagon.initialized then
- wagon:get_staticdata()
- end
- end
- --cross out userdata
- for w_id, data in pairs(advtrains.wagon_save) do
- data.name=nil
- data.object=nil
- if data.driver then
- data.driver_name=data.driver:get_player_name()
- data.driver=nil
- else
- data.driver_name=nil
- end
- if data.discouple then
- data.discouple.object:remove()
- data.discouple=nil
- end
- end
- --print(dump(advtrains.wagon_save))
- datastr = minetest.serialize(advtrains.wagon_save)
- if not datastr then
- minetest.log("error", "[advtrains] Failed to serialize train data!")
- return
- end
- file, err = io.open(advtrains.fpath_ws, "w")
- if err then
- return err
- end
- file:write(datastr)
- file:close()
-
- advtrains.save_trackdb()
-end
-minetest.register_on_shutdown(advtrains.save)
-
-advtrains.save_and_audit_timer=advtrains.audit_interval
-minetest.register_globalstep(function(dtime)
- advtrains.save_and_audit_timer=advtrains.save_and_audit_timer-dtime
- if advtrains.save_and_audit_timer<=0 then
- local t=os.clock()
- --print("[advtrains] audit step")
- --clean up orphaned trains
- for k,v in pairs(advtrains.trains) do
- --advtrains.update_trainpart_properties(k)
- if #v.trainparts==0 then
- print("[advtrains][train "..k.."] has empty trainparts, removing.")
- advtrains.trains[k]=nil
- end
- end
- --save
- advtrains.save()
- advtrains.save_and_audit_timer=advtrains.audit_interval
- printbm("saving", t)
- end
- --regular train step
- local t=os.clock()
- for k,v in pairs(advtrains.trains) do
- advtrains.train_step(k, v, dtime)
- end
-
- --see tracks.lua
- if advtrains.detector.clean_step_before then
- advtrains.detector.finalize_restore()
- end
-
- printbm("trainsteps", t)
- endstep()
-end)
-
-function advtrains.train_step(id, train, dtime)
-
- --TODO check for all vars to be present
- if not train.velocity then
- train.velocity=0
- end
- if not train.movedir or (train.movedir~=1 and train.movedir~=-1) then
- train.movedir=1
- end
- --very unimportant thing: check if couple is here
- if train.couple_eid_front and (not minetest.luaentities[train.couple_eid_front] or not minetest.luaentities[train.couple_eid_front].is_couple) then train.couple_eid_front=nil end
- if train.couple_eid_back and (not minetest.luaentities[train.couple_eid_back] or not minetest.luaentities[train.couple_eid_back].is_couple) then train.couple_eid_back=nil end
-
- --skip certain things (esp. collision) when not moving
- local train_moves=(train.velocity~=0)
-
- --if not train.last_pos then advtrains.trains[id]=nil return end
-
- if not advtrains.pathpredict(id, train) then
- print("pathpredict failed(returned false)")
- train.velocity=0
- train.tarvelocity=0
- return
- end
-
- local path=advtrains.get_or_create_path(id, train)
- if not path then
- train.velocity=0
- train.tarvelocity=0
- print("train has no path for whatever reason")
- return
- end
-
- local train_end_index=advtrains.get_train_end_index(train)
- --apply off-track handling:
- local front_off_track=train.max_index_on_track and train.index>train.max_index_on_track
- local back_off_track=train.min_index_on_track and train_end_index<train.min_index_on_track
- if front_off_track and back_off_track then--allow movement in both directions
- if train.tarvelocity>1 then train.tarvelocity=1 end
- elseif front_off_track then--allow movement only backward
- if train.movedir==1 and train.tarvelocity>0 then train.tarvelocity=0 end
- if train.movedir==-1 and train.tarvelocity>1 then train.tarvelocity=1 end
- elseif back_off_track then--allow movement only forward
- if train.movedir==-1 and train.tarvelocity>0 then train.tarvelocity=0 end
- if train.movedir==1 and train.tarvelocity>1 then train.tarvelocity=1 end
- end
-
- --update advtrains.detector
- if not train.detector_old_index then
- train.detector_old_index = math.floor(train_end_index)
- train.detector_old_end_index = math.floor(train_end_index)
- end
- local ifo, ifn, ibo, ibn = train.detector_old_index, math.floor(train.index), train.detector_old_end_index, math.floor(train_end_index)
- if ifn>ifo then
- for i=ifo, ifn do
- if path[i] then
- advtrains.detector.enter_node(path[i], id)
- end
- end
- elseif ifn<ifo then
- for i=ifn, ifo do
- if path[i] then
- advtrains.detector.leave_node(path[i], id)
- end
- end
- end
- if ibn<ibo then
- for i=ibn, ibn do
- if path[i] then
- advtrains.detector.enter_node(path[i], id)
- end
- end
- elseif ibn>ibo then
- for i=ibo, ibn do
- if path[i] then
- advtrains.detector.leave_node(path[i], id)
- end
- end
- end
- train.detector_old_index = math.floor(train.index)
- train.detector_old_end_index = math.floor(train_end_index)
-
- if train_moves then
- --check for collisions by finding objects
- --front
- local search_radius=4
-
- --coupling
- local couple_outward=1
- local posfront=advtrains.get_real_index_position(path, train.index+couple_outward)
- local posback=advtrains.get_real_index_position(path, train_end_index-couple_outward)
- for _,pos in ipairs({posfront, posback}) do
- if pos then
- local objrefs=minetest.get_objects_inside_radius(pos, search_radius)
- for _,v in pairs(objrefs) do
- local le=v:get_luaentity()
- if le and le.is_wagon and le.initialized and le.train_id~=id then
- advtrains.try_connect_trains(id, le.train_id)
- end
- end
- end
- end
- --heh, new collision again.
- --this time, based on NODES and the advtrains.detector.on_node table.
- local collpos
- local coll_grace=1
- if train.movedir==1 then
- collpos=advtrains.get_real_index_position(path, train.index-coll_grace)
- else
- collpos=advtrains.get_real_index_position(path, train_end_index+coll_grace)
- end
- if collpos then
- local rcollpos=advtrains.round_vector_floor_y(collpos)
- for x=-1,1 do
- for z=-1,1 do
- local testpts=minetest.pos_to_string(vector.add(rcollpos, {x=x, y=0, z=z}))
- if advtrains.detector.on_node[testpts] and advtrains.detector.on_node[testpts]~=id then
- --collides
- train.recently_collided_with_env=true
- train.velocity=0.5*train.velocity
- train.movedir=train.movedir*-1
- train.tarvelocity=0
- end
- end
- end
- end
- end
- --check for any trainpart entities if they have been unloaded. do this only if train is near a player, to not spawn entities into unloaded areas
- train.check_trainpartload=(train.check_trainpartload or 0)-dtime
- local node_range=(math.max((minetest.setting_get("active_block_range") or 0),1)*16)
- if train.check_trainpartload<=0 then
- local ori_pos=advtrains.get_real_index_position(path, train.index) --not much to calculate
- print("[advtrains][train "..id.."] at "..minetest.pos_to_string(vector.round(ori_pos)))
-
- local should_check=false
- for _,p in ipairs(minetest.get_connected_players()) do
- should_check=should_check or ((vector.distance(ori_pos, p:getpos())<node_range))
- end
- if should_check then
- --it is better to iterate luaentites only once
- --print("check_trainpartload")
- local found_uids={}
- for _,wagon in pairs(minetest.luaentities) do
- if wagon.is_wagon and wagon.initialized and wagon.train_id==id then
- if found_uids[wagon.unique_id] then
- --duplicate found, delete it
- if wagon.object then wagon.object:remove() end
- else
- found_uids[wagon.unique_id]=true
- end
- end
- end
- --print("found_uids: "..dump(found_uids))
- --now iterate trainparts and check. then cross them out to see if there are wagons over for any reason
- for pit, w_id in ipairs(train.trainparts) do
- if found_uids[w_id] then
- --print(w_id.." still loaded")
- elseif advtrains.wagon_save[w_id] then
- --print(w_id.." not loaded, but save available")
- --spawn a new and initialize it with the properties from wagon_save
- local le=minetest.env:add_entity(ori_pos, advtrains.wagon_save[w_id].entity_name):get_luaentity()
- le:init_from_wagon_save(w_id)
- else
- print(w_id.." not loaded and no save available")
- --what the hell...
- table.remove(train.trainparts, pit)
- end
- end
- end
- train.check_trainpartload=2
- end
-
-
- --handle collided_with_env
- if train.recently_collided_with_env then
- train.tarvelocity=0
- if not train_moves then
- train.recently_collided_with_env=false--reset status when stopped
- end
- end
- if train.locomotives_in_train==0 then
- train.tarvelocity=0
- end
- --make brake adjust the tarvelocity if necessary
- if train.brake and (math.ceil(train.velocity)-1)<train.tarvelocity then
- train.tarvelocity=math.max((math.ceil(train.velocity)-1), 0)
- end
- --apply tarvel(but with physics in mind!)
- if train.velocity~=train.tarvelocity then
- local applydiff=0
- local mass=#train.trainparts
- local diff=train.tarvelocity-train.velocity
- if diff>0 then--accelerating, force will be brought on only by locomotives.
- --print("accelerating with default force")
- applydiff=(math.min((advtrains.train_accel_force*train.locomotives_in_train*dtime)/mass, math.abs(diff)))
- else--decelerating
- if front_off_track or back_off_track or train.recently_collided_with_env then --every wagon has a brake, so not divided by mass.
- --print("braking with emergency force")
- applydiff= -(math.min((advtrains.train_emerg_force*dtime), math.abs(diff)))
- elseif train.brake then
- --print("braking with default force")
- --no math.min, because it can grow beyond tarvelocity, see up there
- --dont worry, it will never fall below zero.
- applydiff= -((advtrains.train_brake_force*dtime))
- else
- --print("roll")
- applydiff= -(math.min((advtrains.train_roll_force*dtime), math.abs(diff)))
- end
- end
- train.last_accel=(applydiff*train.movedir)
- train.velocity=math.min(math.max( train.velocity+applydiff , 0), advtrains.all_traintypes[train.traintype].max_speed)
- else
- train.last_accel=0
- end
-
- --move
- --TODO 3,5 + 0.7
- train.index=train.index and train.index+(((train.velocity*train.movedir)/(train.path_dist[math.floor(train.index)] or 1))*dtime) or 0
-
-end
-
-
---structure of train table:
---[[
-trains={
- [train_id]={
- trainparts={
- [n]=wagon_id
- }
- path={path}
- velocity
- tarvelocity
- index
- trainlen
- path_inv_level
- last_pos |
- last_dir | for pathpredicting.
- }
-}
---a wagon itself has the following properties:
-wagon={
- unique_id
- train_id
- pos_in_train (is index difference, including train_span stuff)
- pos_in_trainparts (is index in trainparts tabel of trains)
-}
-inherited by metatable:
-wagon_proto={
- wagon_span
-}
-]]
-
---returns new id
-function advtrains.create_new_train_at(pos, pos_prev, traintype)
- local newtrain_id=os.time()..os.clock()
- while advtrains.trains[newtrain_id] do newtrain_id=os.time()..os.clock() end--ensure uniqueness(will be unneccessary)
-
- advtrains.trains[newtrain_id]={}
- advtrains.trains[newtrain_id].last_pos=pos
- advtrains.trains[newtrain_id].last_pos_prev=pos_prev
- advtrains.trains[newtrain_id].traintype=traintype
- advtrains.trains[newtrain_id].tarvelocity=0
- advtrains.trains[newtrain_id].velocity=0
- advtrains.trains[newtrain_id].trainparts={}
- return newtrain_id
-end
-
---returns false on failure. handle this case!
-function advtrains.pathpredict(id, train)
-
- --print("pos ",x,y,z)
- --::rerun::
- if not train.index then train.index=0 end
- if not train.path or #train.path<2 then
- if not train.last_pos then
- --no chance to recover
- print("[advtrains]train hasn't saved last-pos, removing train.")
- advtrains.train[id]=nil
- return false
- end
-
- local node_ok=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(train.last_pos), train.traintype)
-
- if node_ok==nil then
- --block not loaded, do nothing
- return nil
- elseif node_ok==false then
- print("[advtrains]no track here, (fail) removing train.")
- advtrains.trains[id]=nil
- return false
- end
-
- if not train.last_pos_prev then
- --no chance to recover
- print("[advtrains]train hasn't saved last-pos_prev, removing train.")
- advtrains.trains[id]=nil
- return false
- end
-
- local prevnode_ok=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(train.last_pos_prev), train.traintype)
-
- if prevnode_ok==nil then
- --block not loaded, do nothing
- return nil
- elseif prevnode_ok==false then
- print("[advtrains]no track at prev, (fail) removing train.")
- advtrains.trains[id]=nil
- return false
- end
-
- train.index=(train.restore_add_index or 0)+(train.savedpos_off_track_index_offset or 0)
- --restore_add_index is set by save() to prevent trains hopping to next round index. should be between -0.5 and 0.5
- --savedpos_off_track_index_offset is set if train went off track. see below.
- train.path={}
- train.path_dist={}
- train.path[0]=train.last_pos
- train.path[-1]=train.last_pos_prev
- train.path_dist[-1]=vector.distance(train.last_pos, train.last_pos_prev)
- end
-
- local pregen_front=2
- local pregen_back=2
- if train.velocity>0 then
- if train.movedir>0 then
- pregen_front=2+math.ceil(train.velocity*0.15) --assumes server step of 0.1 seconds, +50% tolerance
- else
- pregen_back=2+math.ceil(train.velocity*0.15)
- end
- end
-
-
- local maxn=advtrains.maxN(train.path)
- while (maxn-train.index) < pregen_front do--pregenerate
- --print("[advtrains]maxn conway for ",maxn,minetest.pos_to_string(path[maxn]),maxn-1,minetest.pos_to_string(path[maxn-1]))
- local conway=advtrains.conway(train.path[maxn], train.path[maxn-1], train.traintype)
- if conway then
- train.path[maxn+1]=conway
- train.max_index_on_track=maxn
- else
- --do as if nothing has happened and preceed with path
- --but do not update max_index_on_track
- --print("over-generating path max to index "..maxn+1)
- train.path[maxn+1]=vector.add(train.path[maxn], vector.subtract(train.path[maxn], train.path[maxn-1]))
- end
- train.path_dist[maxn]=vector.distance(train.path[maxn+1], train.path[maxn])
- maxn=advtrains.maxN(train.path)
- end
-
- local minn=advtrains.minN(train.path)
- while (train.index-minn) < (train.trainlen or 0) + pregen_back do --post_generate. has to be at least trainlen. (we let go of the exact calculation here since this would be unuseful here)
- --print("[advtrains]minn conway for ",minn,minetest.pos_to_string(path[minn]),minn+1,minetest.pos_to_string(path[minn+1]))
- local conway=advtrains.conway(train.path[minn], train.path[minn+1], train.traintype)
- if conway then
- train.path[minn-1]=conway
- train.min_index_on_track=minn
- else
- --do as if nothing has happened and preceed with path
- --but do not update min_index_on_track
- --print("over-generating path min to index "..minn-1)
- train.path[minn-1]=vector.add(train.path[minn], vector.subtract(train.path[minn], train.path[minn+1]))
- end
- train.path_dist[minn-1]=vector.distance(train.path[minn], train.path[minn-1])
- minn=advtrains.minN(train.path)
- end
- if not train.min_index_on_track then train.min_index_on_track=0 end
- if not train.max_index_on_track then train.max_index_on_track=0 end
-
- --make pos/yaw available for possible recover calls
- if train.max_index_on_track<train.index then --whoops, train went too far. the saved position will be the last one that lies on a track, and savedpos_off_track_index_offset will hold how far to go from here
- train.savedpos_off_track_index_offset=train.index-train.max_index_on_track
- train.last_pos=train.path[train.max_index_on_track]
- train.last_pos_prev=train.path[train.max_index_on_track-1]
- --print("train is off-track (front), last positions kept at "..minetest.pos_to_string(train.last_pos).." / "..minetest.pos_to_string(train.last_pos_prev))
- elseif train.min_index_on_track+1>train.index then --whoops, train went even more far. same behavior
- train.savedpos_off_track_index_offset=train.index-train.min_index_on_track
- train.last_pos=train.path[train.min_index_on_track+1]
- train.last_pos_prev=train.path[train.min_index_on_track]
- --print("train is off-track (back), last positions kept at "..minetest.pos_to_string(train.last_pos).." / "..minetest.pos_to_string(train.last_pos_prev))
- else --regular case
- train.savedpos_off_track_index_offset=nil
- train.last_pos=train.path[math.floor(train.index+0.5)]
- train.last_pos_prev=train.path[math.floor(train.index-0.5)]
- end
- return train.path
-end
-function advtrains.get_train_end_index(train)
- return advtrains.get_real_path_index(train, train.trainlen or 2)--this function can be found inside wagons.lua since it's more related to wagons. we just set trainlen as pos_in_train
-end
-
-function advtrains.get_or_create_path(id, train)
- if not train.path then return advtrains.pathpredict(id, train) end
- return train.path
-end
-
-function advtrains.add_wagon_to_train(wagon, train_id, index)
- local train=advtrains.trains[train_id]
- if index then
- table.insert(train.trainparts, index, wagon.unique_id)
- else
- table.insert(train.trainparts, wagon.unique_id)
- end
- --this is not the usual case!!!
- --we may set initialized because the wagon has no chance to step()
- wagon.initialized=true
- --TODO is this art or can we throw it away?
- advtrains.update_trainpart_properties(train_id)
-end
-function advtrains.update_trainpart_properties(train_id, invert_flipstate)
- local train=advtrains.trains[train_id]
- local rel_pos=0
- local count_l=0
- for i, w_id in ipairs(train.trainparts) do
- local any_loaded=false
- for _,wagon in pairs(minetest.luaentities) do
- if wagon.is_wagon and wagon.initialized and wagon.unique_id==w_id then
- rel_pos=rel_pos+wagon.wagon_span
- wagon.train_id=train_id
- wagon.pos_in_train=rel_pos
- wagon.pos_in_trainparts=i
- wagon.old_velocity_vector=nil
- if wagon.is_locomotive then
- count_l=count_l+1
- end
- if invert_flipstate then
- wagon.wagon_flipped = not wagon.wagon_flipped
- end
- rel_pos=rel_pos+wagon.wagon_span
- any_loaded=true
- end
- end
- if not any_loaded then
- print("update_trainpart_properties wagon "..w_id.." not loaded, ignoring it.")
- end
- end
- train.trainlen=rel_pos
- train.locomotives_in_train=count_l
-end
-
-function advtrains.split_train_at_wagon(wagon)
- --get train
- local train=advtrains.trains[wagon.train_id]
- local real_pos_in_train=advtrains.get_real_path_index(train, wagon.pos_in_train)
- local pos_for_new_train=advtrains.get_or_create_path(wagon.train_id, train)[math.floor(real_pos_in_train+wagon.wagon_span)]
- local pos_for_new_train_prev=advtrains.get_or_create_path(wagon.train_id, train)[math.floor(real_pos_in_train-1+wagon.wagon_span)]
-
- --before doing anything, check if both are rails. else do not allow
- if not pos_for_new_train then
- print("split_train: pos_for_new_train not set")
- return false
- end
- local node_ok=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(pos_for_new_train), train.traintype)
- if not node_ok then
- print("split_train: pos_for_new_train "..minetest.pos_to_string(advtrains.round_vector_floor_y(pos_for_new_train_prev)).." not loaded or is not a rail")
- return false
- end
-
- if not train.last_pos_prev then
- print("split_train: pos_for_new_train_prev not set")
- return false
- end
-
- local prevnode_ok=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(pos_for_new_train), train.traintype)
- if not prevnode_ok then
- print("split_train: pos_for_new_train_prev "..minetest.pos_to_string(advtrains.round_vector_floor_y(pos_for_new_train_prev)).." not loaded or is not a rail")
- return false
- end
-
- --create subtrain
- local newtrain_id=advtrains.create_new_train_at(pos_for_new_train, pos_for_new_train_prev, train.traintype)
- local newtrain=advtrains.trains[newtrain_id]
- --insert all wagons to new train
- for k,v in ipairs(train.trainparts) do
- if k>=wagon.pos_in_trainparts then
- table.insert(newtrain.trainparts, v)
- train.trainparts[k]=nil
- end
- end
- --update train parts
- advtrains.update_trainpart_properties(wagon.train_id)--atm it still is the desierd id.
- advtrains.update_trainpart_properties(newtrain_id)
- train.tarvelocity=0
- newtrain.velocity=train.velocity
- newtrain.tarvelocity=0
-end
-
---there are 4 cases:
---1/2. F<->R F<->R regular, put second train behind first
---->frontpos of first train will match backpos of second
---3. F<->R R<->F flip one of these trains, take the other as new train
---->backpos's will match
---4. R<->F F<->R flip one of these trains and take it as new parent
---->frontpos's will match
-function advtrains.try_connect_trains(id1, id2)
- local train1=advtrains.trains[id1]
- local train2=advtrains.trains[id2]
- if not train1 or not train2 then return end
- if not train1.path or not train2.path then return end
- if #train1.trainparts==0 or #train2.trainparts==0 then return end
-
- local frontpos1=advtrains.get_real_index_position(train1.path, train1.index)
- local backpos1=advtrains.get_real_index_position(train1.path, advtrains.get_train_end_index(train1))
- --couple logic
- if train1.traintype==train2.traintype then
- local frontpos2=advtrains.get_real_index_position(train2.path, train2.index)
- local backpos2=advtrains.get_real_index_position(train2.path, advtrains.get_train_end_index(train2))
-
- if not frontpos1 or not frontpos2 or not backpos1 or not backpos2 then return end
-
- local couple_spawnradius=0.7
- --case 1 (first train is front)
- if vector.distance(frontpos2, backpos1)<couple_spawnradius then
- advtrains.spawn_couple_if_neccessary(backpos1, frontpos2, id1, id2, true, false)
- --case 2 (second train is front)
- elseif vector.distance(frontpos1, backpos2)<couple_spawnradius then
- advtrains.spawn_couple_if_neccessary(backpos2, frontpos1, id2, id1, true, false)
- --case 3
- elseif vector.distance(backpos2, backpos1)<couple_spawnradius then
- advtrains.spawn_couple_if_neccessary(backpos1, backpos2, id1, id2, true, true)
- --case 4
- elseif vector.distance(frontpos2, frontpos1)<couple_spawnradius then
- advtrains.spawn_couple_if_neccessary(frontpos1, frontpos2, id1, id2, false, false)
- end
- end
-end
---true when trains are facing each other. needed on colliding.
--- check done by iterating paths and checking their direction
---returns nil when not on the same track at all OR when required path items are not generated. this distinction may not always be needed.
-function advtrains.trains_facing(train1, train2)
- local sr_pos=train1.path[math.floor(train1.index)]
- local sr_pos_p=train1.path[math.floor(train1.index)-1]
-
- for i=advtrains.minN(train2.path), advtrains.maxN(train2.path) do
- if vector.equals(sr_pos, train2.path[i]) then
- if train2.path[i+1] and vector.equals(sr_pos_p, train2.path[i+1]) then return true end
- if train2.path[i-1] and vector.equals(sr_pos_p, train2.path[i-1]) then return false end
- return nil
- end
- end
- return nil
-end
-
---order of trains may be irrelevant in some cases. check opposite cases. TODO does this work?
---pos1 and pos2 are just needed to form a median.
-function advtrains.spawn_couple_if_neccessary(pos1, pos2, tid1, tid2, train1_is_backpos, train2_is_backpos)
- --print("spawn_couple_if_neccessary..."..dump({pos1=pos1, pos2=pos2, train1_is_backpos=train1_is_backpos, train2_is_backpos=train2_is_backpos}))
- local train1=advtrains.trains[tid1]
- local train2=advtrains.trains[tid2]
- local t1_has_couple
- if train1_is_backpos then
- t1_has_couple=train1.couple_eid_back
- else
- t1_has_couple=train1.couple_eid_front
- end
- local t2_has_couple
- if train2_is_backpos then
- t2_has_couple=train2.couple_eid_back
- else
- t2_has_couple=train2.couple_eid_front
- end
-
- if t1_has_couple and t2_has_couple then
- if t1_has_couple~=t2_has_couple then--what the hell
- if minetest.object_refs[t2_has_couple] then minetest.object_refs[t2_has_couple]:remove() end
- if train2_is_backpos then
- train2.couple_eid_back=t1_has_couple
- else
- train2.couple_eid_front=t1_has_couple
- end
- end
- --[[elseif t1_has_couple and not t2_has_couple then
- if train2_is_backpos then
- train2.couple_eid_back=t1_has_couple
- else
- train2.couple_eid_front=t1_has_couple
- end
- elseif not t1_has_couple and t2_has_couple then
- if train1_is_backpos then
- train1.couple_eid_back=t2_has_couple
- else
- train1.couple_eid_front=t2_has_couple
- end]]
- else
- local pos=advtrains.pos_median(pos1, pos2)
- local obj=minetest.add_entity(pos, "advtrains:couple")
- if not obj then print("failed creating object") return end
- local le=obj:get_luaentity()
- le.train_id_1=tid1
- le.train_id_2=tid2
- le.train1_is_backpos=train1_is_backpos
- le.train2_is_backpos=train2_is_backpos
- --find in object_refs
- for aoi, compare in pairs(minetest.object_refs) do
- if compare==obj then
- if train1_is_backpos then
- train1.couple_eid_back=aoi
- else
- train1.couple_eid_front=aoi
- end
- if train2_is_backpos then
- train2.couple_eid_back=aoi
- else
- train2.couple_eid_front=aoi
- end
- end
- end
- end
-end
-
-function advtrains.do_connect_trains(first_id, second_id)
- local first_wagoncnt=#advtrains.trains[first_id].trainparts
- local second_wagoncnt=#advtrains.trains[second_id].trainparts
-
- for _,v in ipairs(advtrains.trains[second_id].trainparts) do
- table.insert(advtrains.trains[first_id].trainparts, v)
- end
- --kick it like physics (with mass being #wagons)
- local new_velocity=((advtrains.trains[first_id].velocity*first_wagoncnt)+(advtrains.trains[second_id].velocity*second_wagoncnt))/(first_wagoncnt+second_wagoncnt)
- advtrains.trains[second_id]=nil
- advtrains.update_trainpart_properties(first_id)
- advtrains.trains[first_id].velocity=new_velocity
- advtrains.trains[first_id].tarvelocity=0
-end
-
-function advtrains.invert_train(train_id)
- local train=advtrains.trains[train_id]
-
- local old_path=advtrains.get_or_create_path(train_id, train)
- train.path={}
- train.index= - advtrains.get_train_end_index(train)
- train.velocity=-train.velocity
- train.tarvelocity=-train.tarvelocity
- for k,v in pairs(old_path) do
- train.path[-k]=v
- end
- local old_trainparts=train.trainparts
- train.trainparts={}
- for k,v in ipairs(old_trainparts) do
- table.insert(train.trainparts, 1, v)--notice insertion at first place
- end
- advtrains.update_trainpart_properties(train_id, true)
-end
-
-function advtrains.is_train_at_pos(pos)
- --print("istrainat: pos "..minetest.pos_to_string(pos))
- local checked_trains={}
- local objrefs=minetest.get_objects_inside_radius(pos, 2)
- for _,v in pairs(objrefs) do
- local le=v:get_luaentity()
- if le and le.is_wagon and le.initialized and le.train_id and not checked_trains[le.train_id] then
- --print("istrainat: checking "..le.train_id)
- checked_trains[le.train_id]=true
- local path=advtrains.get_or_create_path(le.train_id, le:train())
- if path then
- --print("has path")
- for i=math.floor(advtrains.get_train_end_index(le:train())+0.5),math.floor(le:train().index+0.5) do
- if path[i] then
- --print("has pathitem "..i.." "..minetest.pos_to_string(path[i]))
- if vector.equals(advtrains.round_vector_floor_y(path[i]), pos) then
- return true
- end
- end
- end
- end
- end
- end
- return false
-end
-function advtrains.invalidate_all_paths()
- --print("invalidating all paths")
- for k,v in pairs(advtrains.trains) do
- if v.index then
- v.restore_add_index=v.index-math.floor(v.index+0.5)
- end
- v.path=nil
- v.path_dist=nil
- v.index=nil
- v.min_index_on_track=nil
- v.max_index_on_track=nil
-
- advtrains.detector.setup_restore()
- v.detector_old_index=nil
- v.detector_old_end_index=nil
- end
-end
-
---not blocking trains group
-function advtrains.train_collides(node)
- if node and minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].walkable then
- if not minetest.registered_nodes[node.name].groups.not_blocking_trains then
- return true
- end
- end
- return false
-end
-
-local nonblocknodes={
- "default:fence_wood",
- "default:fence_acacia_wood",
- "default:fence_aspen_wood",
- "default:fence_pine_wood",
- "default:fence_junglewood",
- "default:torch",
-
- "default:sign_wall",
- "signs:sign_wall",
- "signs:sign_wall_blue",
- "signs:sign_wall_brown",
- "signs:sign_wall_orange",
- "signs:sign_wall_green",
- "signs:sign_yard",
- "signs:sign_wall_white_black",
- "signs:sign_wall_red",
- "signs:sign_wall_white_red",
- "signs:sign_wall_yellow",
- "signs:sign_post",
- "signs:sign_hanging",
-
-
-}
-minetest.after(0, function()
- for _,name in ipairs(nonblocknodes) do
- if minetest.registered_nodes[name] then
- minetest.registered_nodes[name].groups.not_blocking_trains=1
- end
- end
-end)