index : advtrains.git	atcjit doc l10n luaatcdebug master new-ks new-ks-orwell profiler route_prog_rework techage tracy trainhud trainhud-unifont
	Advtrains mod for minetest.	orwell

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	Commit message (Expand)	Author	Age
*	Update interlocking manual	orwell96	2019-01-15
*	Signs (static signals)	orwell96	2018-12-08
*	Shunt signals (not exactly Ks), along with fixes in other components that tho...	orwell96	2018-12-08
*	Complete Ks Main signals	orwell96	2018-10-26
*	Actually allow what manual promises (setting IP on non-assigned signals)	orwell96	2018-10-17
*	Update manual again	orwell96	2018-10-15
*	Improve route programming:	orwell96	2018-10-07
*	Add interlocking guide/manual, silence debug outputs	orwell96	2018-09-14
*	Interlocking: Create demo signals, signal API and model for TCB configurer node	orwell96	2018-06-19
*	Create models for Ks signals	orwell96	2018-06-14
*	Add Andrew's Cross	orwell96	2017-04-27
*	Redo rail models	orwell96	2017-03-12
*	Update manual and include everything in repo	orwell96	2017-03-09
*	Remove blend1 files cluttering the assets directory	orwell96	2017-03-08
*	Add ceiling-mounted signal	orwell96	2017-02-28
*	add wallmounted light signal	orwell96	2017-02-03
*	Create new models and textures for japanese train	orwell96	2017-01-24
*	Update manual	orwell96	2017-01-18
*	Add detailed steam engine contributed by mbb and Krokoschlange	orwell96	2017-01-17
*	Add animation for steam engine	orwell96	2017-01-17
*	Model, animate, texture and integrate new subway wagon	orwell96	2017-01-17
*	Download recent contributions and put them into the assets directory	orwell96	2017-01-17
*	Add fancy passenger wagon	orwell96	2017-01-06
*	Restructure mod directory	orwell96	2017-01-04

generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 15:32:50 +0000

--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)
	if tp.tracks[nnprefix] then return end--due to the separate registration of slopes and flats for the same nnpref, definition would be overridden here. just don't.
	tp.tracks[nnprefix]={
		default=n_suffix,
		single_conn={},
		single_conn_1={},
		single_conn_2={},
		double_conn={},
		double_conn_1={},
		double_conn_2={},
		--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}
		tp.tracks[nnprefix].double_conn_1[((conns.conn1+4*i)%16).."_"..((conns.conn2+4*i)%16)]={name=nodename, param2=i}
		tp.tracks[nnprefix].double_conn_2[((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}
		tp.tracks[nnprefix].single_conn_1[((conns.conn1+4*i)%16)]={name=nodename, param2=i}
		tp.tracks[nnprefix].single_conn_2[((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
]]

local function istrackandbc(pos_p, conn)
	local tpos = pos_p
	local cnode=minetest.get_node(advtrains.dirCoordSet(tpos, conn.c))
	if advtrains.is_track_and_drives_on(cnode.name, advtrains.all_tracktypes) then
		local cconns=advtrains.get_track_connections(cnode.name, cnode.param2)
		return advtrains.conn_matches_to(conn, cconns)
	end
	--try the same 1 node below
	tpos = {x=tpos.x, y=tpos.y-1, z=tpos.z}
	cnode=minetest.get_node(advtrains.dirCoordSet(tpos, conn.c))
	if advtrains.is_track_and_drives_on(cnode.name, advtrains.all_tracktypes) then
		local cconns=advtrains.get_track_connections(cnode.name, cnode.param2)
		return advtrains.conn_matches_to(conn, cconns)
	end
	return false
end

function tp.find_already_connected(pos)
	local dnode=minetest.get_node(pos)
	local dconns=advtrains.get_track_connections(dnode.name, dnode.param2)
	local found_conn
	for connid, conn in ipairs(dconns) do
		if istrackandbc(pos, conn) then
			if found_conn then --we found one in previous iteration
				return true, true --signal that it's connected
			else
				found_conn = conn.c
			end
		end
	end
	return found_conn
end
function tp.rail_and_can_be_bent(originpos, conn)
	local pos=advtrains.dirCoordSet(originpos, conn)
	local newdir=(conn+8)%16
	local node=minetest.get_node(pos)
	if not advtrains.is_track_and_drives_on(node.name, advtrains.all_tracktypes) then
		return false
	end
	local ndef=minetest.registered_nodes[node.name]
	local nnpref = ndef and ndef.at_nnpref
	if not nnpref then return false end
	local tr=tp.tracks[nnpref]
	if not tr then return false end
	if not tr.modify[node.name] then 
		--we actually can use this rail, but only if it already points to the desired direction.
		if advtrains.is_track_and_drives_on(node.name, advtrains.all_tracktypes) then
			local cconns=advtrains.get_track_connections(node.name, node.param2)
			return advtrains.conn_matches_to(conn, cconns)
		end
	end
	-- If the rail is not allowed to be modified, also only use if already in desired direction
	if not advtrains.can_dig_or_modify_track(pos) then
		local cconns=advtrains.get_track_connections(node.name, node.param2)
		return advtrains.conn_matches_to(conn, cconns)
	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)
	local pos=advtrains.dirCoordSet(originpos, conn)
	local newdir=advtrains.oppd(conn)
	local node=minetest.get_node(pos)
	local ndef=minetest.registered_nodes[node.name]
	local nnpref = ndef and ndef.at_nnpref
	if not nnpref then return false end
	local tr=tp.tracks[nnpref]
	if not tr then return false end
	--is rail already connected? no need to bend.
	local conns=advtrains.get_track_connections(node.name, node.param2)
	if advtrains.conn_matches_to(conn, conns) 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
			advtrains.ndb.swap_node(pos, tr.double_conn[adj1.."_"..newdir])
			return true--if exists, connect new rail and old end
		end
		return false