diff options
Diffstat (limited to 'trainlogic.lua')
| -rw-r--r-- | trainlogic.lua | 543 |
1 files changed, 543 insertions, 0 deletions
diff --git a/trainlogic.lua b/trainlogic.lua new file mode 100644 index 0000000..74e9c97 --- /dev/null +++ b/trainlogic.lua @@ -0,0 +1,543 @@ +--trainlogic.lua +--controls train entities stuff about connecting/disconnecting/colliding trains and other things + +local print=function(t) minetest.log("action", t) minetest.chat_send_all(t) end + +advtrains.train_accel_force=5--per second and divided by number of wagons +advtrains.train_brake_force=3--per second, not divided by number of wagons +advtrains.train_emerg_force=10--for emergency brakes(when going off track) + +advtrains.audit_interval=10 + +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={} + +--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.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() +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 + --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 + advtrains.trains[k]=nil + end + end + --save + advtrains.save() + advtrains.save_and_audit_timer=advtrains.audit_interval + end + --regular train step + for k,v in pairs(advtrains.trains) do + advtrains.train_step(k, v, dtime) + end +end) + +function advtrains.train_step(id, train, dtime) + + --TODO check for all vars to be present + + --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") + return + end + --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.index-train.trainlen)<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 + if train.tarvelocity<-1 then train.tarvelocity=-1 end + elseif front_off_track then--allow movement only backward + if train.tarvelocity>0 then train.tarvelocity=0 end + if train.tarvelocity<-1 then train.tarvelocity=-1 end + elseif back_off_track then--allow movement only forward + if train.tarvelocity>1 then train.tarvelocity=1 end + if train.tarvelocity<0 then train.tarvelocity=0 end + end + + --move + if not train.velocity then + train.velocity=0 + end + train.index=train.index and train.index+((train.velocity/(train.path_dist[math.floor(train.index)] or 1))*dtime) or 0 + --check for collisions by finding objects + --front + local search_radius=4 + + local posfront=path[math.floor(train.index+1)] + if posfront then + local objrefs=minetest.get_objects_inside_radius(posfront, 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 + local posback=path[math.floor(train.index-(train.trainlen or 0)-1)] + if posback then + local objrefs=minetest.get_objects_inside_radius(posback, 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 + --handle collided_with_env + if train.recently_collided_with_env then + train.tarvelocity=0 + if train.velocity==0 then + train.recently_collided_with_env=false--reset status when stopped + end + end + if train.locomotives_in_train==0 then + train.tarvelocity=0 + end + --apply tarvel(but with physics in mind!) + if train.velocity~=train.tarvelocity then + local applydiff=0 + local mass=#train.trainparts + local diff=math.abs(train.tarvelocity)-math.abs(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))) + else + --print("braking with default force") + applydiff=(math.min((advtrains.train_brake_force*dtime), math.abs(diff))) + end + end + train.velocity=train.velocity+(applydiff*math.sign(train.tarvelocity-train.velocity)) + end + +end + +--the 'leader' concept has been overthrown, we won't rely on MT's "buggy object management" +--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. + no_connect_for_movements (index way counter for when not to connect again) TODO implement + } +} +--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=minetest.get_node_or_nil(advtrains.round_vector_floor_y(train.last_pos)) + if not node then + --print("pathpredict:last_pos node "..minetest.pos_to_string(advtrains.round_vector_floor_y(train.last_pos)).." is nil. block probably not loaded") + return nil + end + local nodename=node.name + + if(not advtrains.is_track_and_drives_on(nodename, advtrains.all_traintypes[train.traintype].drives_on)) then + advtrains.dumppath(train.path) + print("at index "..train.index) + 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=minetest.get_node_or_nil(advtrains.round_vector_floor_y(train.last_pos_prev)) + if not prevnode then + --print("pathpredict:last_pos_prev node "..minetest.pos_to_string(advtrains.round_vector_floor_y(train.last_pos_prev)).." is nil. block probably not loaded") + return nil + end + local prevnodename=prevnode.name + + if(not advtrains.is_track_and_drives_on(prevnodename, advtrains.all_traintypes[train.traintype].drives_on)) then + print("[advtrains]no track at prev, (fail) removing train.") + advtrains.trains[id]=nil + return false + end + + local conn1, conn2=advtrains.get_track_connections(nodename, node.param2) + + 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 maxn=advtrains.maxN(train.path) + while (maxn-train.index) < 2 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], advtrains.all_traintypes[train.traintype].drives_on) + 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) + 2 do --post_generate. has to be at least trainlen. + --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], advtrains.all_traintypes[train.traintype].drives_on) + 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_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 + 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 + 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 + end + 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 pos_for_new_train=advtrains.get_or_create_path(wagon.train_id, train)[math.floor((train.index or 0)-wagon.pos_in_train-0.5)] + local pos_for_new_train_prev=advtrains.get_or_create_path(wagon.train_id, train)[math.floor((train.index or 0)-wagon.pos_in_train-1.5)] + + --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=minetest.get_node_or_nil(advtrains.round_vector_floor_y(pos_for_new_train)) + if not node then + print("split_train: pos_for_new_train node "..minetest.pos_to_string(advtrains.round_vector_floor_y(pos_for_new_train)).." is nil. block probably not loaded") + return nil + end + local nodename=node.name + + if(not advtrains.is_track_and_drives_on(nodename, advtrains.all_traintypes[train.traintype].drives_on)) then + print("split_train: pos_for_new_train "..minetest.pos_to_string(advtrains.round_vector_floor_y(pos_for_new_train_prev)).." 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=minetest.get_node_or_nil(advtrains.round_vector_floor_y(pos_for_new_train_prev)) + if not node then + print("split_train: pos_for_new_train_prev node "..minetest.pos_to_string(advtrains.round_vector_floor_y(pos_for_new_train_prev)).." is nil. block probably not loaded") + return false + end + local prevnodename=prevnode.name + + if(not advtrains.is_track_and_drives_on(prevnodename, advtrains.all_traintypes[train.traintype].drives_on)) then + print("split_train: pos_for_new_train_prev "..minetest.pos_to_string(advtrains.round_vector_floor_y(pos_for_new_train_prev)).." 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.traintype~=train2.traintype then + --TODO implement collision without connection + return + end + if #train1.trainparts==0 or #train2.trainparts==0 then return end + + local frontpos1=train1.path[math.floor(train1.index+0.5)] + local backpos1=train1.path[math.floor(train1.index-(train1.trainlen or 2)+0.5)] + local frontpos2=train2.path[math.floor(train2.index+0.5)] + local backpos2=train2.path[math.floor(train2.index-(train1.trainlen or 2)+0.5)] + + if not frontpos1 or not frontpos2 or not backpos1 or not backpos2 then return end + + --case 1 (first train is front) + if vector.equals(frontpos2, backpos1) then + advtrains.do_connect_trains(id1, id2) + --case 2 (second train is front) + elseif vector.equals(frontpos1, backpos2) then + advtrains.do_connect_trains(id2, id1) + --case 3 + elseif vector.equals(backpos2, backpos1) then + advtrains.invert_train(id2) + advtrains.do_connect_trains(id1, id2) + --case 4 + elseif vector.equals(frontpos2, frontpos1) then + advtrains.invert_train(id1) + advtrains.do_connect_trains(id1, id2) + 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=-train.index+train.trainlen + 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(le:train().index-le:train().trainlen+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.index=nil + v.min_index_on_track=nil + v.max_index_on_track=nil + end +end
\ No newline at end of file |