185 lines
6.6 KiB
Lua
185 lines
6.6 KiB
Lua
--couple.lua
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--defines couple entities.
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--advtrains:discouple
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--set into existing trains to split them when punched.
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--they are attached to the wagons.
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--[[fields
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wagon
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wagons keep their couple entity minetest-internal id inside the field discouple_id. if it refers to nowhere, they will spawn a new one if player is near
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]]
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local couple_max_dist=3
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minetest.register_entity("advtrains:discouple", {
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visual="sprite",
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textures = {"advtrains_discouple.png"},
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collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
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visual_size = {x=1, y=1},
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initial_sprite_basepos = {x=0, y=0},
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is_discouple=true,
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on_activate=function(self, staticdata)
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if staticdata=="DISCOUPLE" then
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--couple entities have no right to exist further...
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atprint("Discouple loaded from staticdata, destroying")
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self.object:remove()
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return
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end
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self.object:set_armor_groups({immortal=1})
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end,
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get_staticdata=function() return "DISCOUPLE" end,
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on_punch=function(self, player)
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return advtrains.pcall(function()
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--only if player owns at least one wagon next to this
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local own=player:get_player_name()
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if self.wagon.owner and self.wagon.owner==own and not self.wagon.lock_couples then
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local train=advtrains.trains[self.wagon.train_id]
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local nextwgn_id=train.trainparts[self.wagon.pos_in_trainparts-1]
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for aoi, le in pairs(minetest.luaentities) do
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if le and le.is_wagon then
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if le.unique_id==nextwgn_id then
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if le.owner and le.owner~=own then
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minetest.chat_send_player(own, attrans("You need to own at least one neighboring wagon to destroy this couple."))
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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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atprint("Discouple punched. Splitting train", self.wagon.train_id)
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advtrains.split_train_at_wagon(self.wagon)--found in trainlogic.lua
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self.object:remove()
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elseif self.wagon.lock_couples then
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minetest.chat_send_player(own, "Couples of one of the wagons are locked, can't discouple!")
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else
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minetest.chat_send_player(own, attrans("You need to own at least one neighboring wagon to destroy this couple."))
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end
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end)
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end,
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on_step=function(self, dtime)
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return advtrains.pcall(function()
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local t=os.clock()
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if not self.wagon then
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self.object:remove()
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atprint("Discouple: no wagon, destroying")
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return
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end
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--getyaw seems to be a reliable method to check if an object is loaded...if it returns nil, it is not.
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if not self.wagon.object:getyaw() then
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atprint("Discouple: wagon no longer loaded, destroying")
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self.object:remove()
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return
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end
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local velocityvec=self.wagon.object:getvelocity()
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self.updatepct_timer=(self.updatepct_timer or 0)-dtime
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if not self.old_velocity_vector or not vector.equals(velocityvec, self.old_velocity_vector) or self.updatepct_timer<=0 then--only send update packet if something changed
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local flipsign=self.wagon.wagon_flipped and -1 or 1
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self.object:setpos(vector.add(self.wagon.object:getpos(), {y=0, x=-math.sin(self.wagon.object:getyaw())*self.wagon.wagon_span*flipsign, z=math.cos(self.wagon.object:getyaw())*self.wagon.wagon_span*flipsign}))
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self.object:setvelocity(velocityvec)
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self.updatepct_timer=2
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end
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atprintbm("discouple_step", t)
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end)
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end,
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})
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--advtrains:couple
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--when two trains overlap with their end-positions, this entity will be spawned and both trains set its id into appropiate fields for them to know when to free them again. The entity will destroy automatically when it recognizes that any of the trains left the common position.
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--[[fields
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train_id_1
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train_id_2
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train1_is_backpos
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train2_is_backpos
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]]
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minetest.register_entity("advtrains:couple", {
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visual="sprite",
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textures = {"advtrains_couple.png"},
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collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
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visual_size = {x=1, y=1},
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initial_sprite_basepos = {x=0, y=0},
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is_couple=true,
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on_activate=function(self, staticdata)
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return advtrains.pcall(function()
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if staticdata=="COUPLE" then
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--couple entities have no right to exist further...
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atprint("Couple loaded from staticdata, destroying")
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self.object:remove()
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return
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end
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end)
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end,
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get_staticdata=function(self) return "COUPLE" end,
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on_rightclick=function(self, clicker)
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return advtrains.pcall(function()
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if not self.train_id_1 or not self.train_id_2 then return end
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local id1, id2=self.train_id_1, self.train_id_2
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if self.train1_is_backpos and not self.train2_is_backpos then
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advtrains.do_connect_trains(id1, id2, clicker)
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--case 2 (second train is front)
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elseif self.train2_is_backpos and not self.train1_is_backpos then
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advtrains.do_connect_trains(id2, id1, clicker)
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--case 3
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elseif self.train1_is_backpos and self.train2_is_backpos then
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advtrains.invert_train(id2)
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advtrains.do_connect_trains(id1, id2, clicker)
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--case 4
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elseif not self.train1_is_backpos and not self.train2_is_backpos then
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advtrains.invert_train(id1)
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advtrains.do_connect_trains(id1, id2, clicker)
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end
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atprint("Coupled trains", id1, id2)
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self.object:remove()
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end)
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end,
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on_step=function(self, dtime)
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return advtrains.pcall(function()
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advtrains.atprint_context_tid=sid(self.train_id_1)
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advtrains.atprint_context_tid_full=self.train_id_1
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local t=os.clock()
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if not self.train_id_1 or not self.train_id_2 then atprint("Couple: train ids not set!") self.object:remove() return end
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local train1=advtrains.trains[self.train_id_1]
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local train2=advtrains.trains[self.train_id_2]
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if not train1 or not train2 then
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atprint("Couple: trains missing, destroying")
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self.object:remove()
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return
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end
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if not train1.path or not train2.path or not train1.index or not train2.index or not train1.end_index or not train2.end_index then
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atprint("Couple: paths or end_index missing. Might happen when paths got cleared")
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return
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end
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local tp1
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if not self.train1_is_backpos then
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tp1=advtrains.get_real_index_position(train1.path, train1.index)
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else
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tp1=advtrains.get_real_index_position(train1.path, train1.end_index)
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end
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local tp2
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if not self.train2_is_backpos then
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tp2=advtrains.get_real_index_position(train2.path, train2.index)
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else
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tp2=advtrains.get_real_index_position(train2.path, train2.end_index)
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end
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if not tp1 or not tp2 or not (vector.distance(tp1,tp2)<couple_max_dist) then
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atprint("Couple: train end positions too distanced, destroying (distance is",vector.distance(tp1,tp2),")")
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self.object:remove()
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return
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else
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local pos_median=advtrains.pos_median(tp1, tp2)
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if not vector.equals(pos_median, self.object:getpos()) then
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self.object:setpos(pos_median)
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end
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end
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atprintbm("couple step", t)
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advtrains.atprint_context_tid=nil
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advtrains.atprint_context_tid_full=nil
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end)
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end,
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})
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