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-- advtrains track map generator
-- Usage: lua main.lua path/to/world
-- Viewport maximum coordinate in all directions
local maxc = 5000
-- embed an image called "world.png"
local wimg = false
-- image file resolution (not world resolution!)
local wimresx = 3000
local wimresy = 3000
-- one pixel is ... nodes
local wimscale = 4
-- y ranges and line colors
-- Minimum y level drawn
local drminy = -30
-- Color of min y level
local colminy = {r=0, g=0, b=255}
-- Intermediate color
local colmedy = {r=255, g=0, b=0}
-- Maximum y level drawn
local drmaxy = 80
-- Color of max y level
local colmaxy = {r=255, g=255, b=0}
datapath = (arg[1] or "").."/"
--Constant for maximum connection value/division of the circle
AT_CMAX = 16
advtrains = {}
minetest = {}
core = minetest
--table for track nodes/connections
trackconns = {}
-- math library seems to be missing this function
math.hypot = function(a,b) return math.sqrt(a*a + b*b) end
-- need to declare this for trackdefs
function attrans(str) return str end
-- pos to string
local function pts(pos)
return pos.x .. "," .. pos.y .. "," .. pos.z
end
--Advtrains dump (special treatment of pos and sigd)
function atdump(t, intend)
local str
if type(t)=="table" then
if t.x and t.y and t.z then
str=minetest.pos_to_string(t)
elseif t.p and t.s then -- interlocking sigd
str="S["..minetest.pos_to_string(t.p).."/"..t.s.."]"
else
str="{"
local intd = (intend or "") .. " "
for k,v in pairs(t) do
if type(k)~="string" or not string.match(k, "^path[_]?") then
-- do not print anything path-related
str = str .. "\n" .. intd .. atdump(k, intd) .. " = " ..atdump(v, intd)
end
end
str = str .. "\n" .. (intend or "") .. "}"
end
elseif type(t)=="boolean" then
if t then
str="true"
else
str="false"
end
elseif type(t)=="function" then
str="<function>"
elseif type(t)=="userdata" then
str="<userdata>"
else
str=""..t
end
return str
end
dofile("vector.lua")
dofile("serialize.lua")
dofile("helpers.lua")
dofile("tracks.lua")
dofile("track_defs.lua")
dofile("nodedb.lua")
function parse_args(argv)
local i = 1
local no_trains = false
local datapath, mappath, worldimage
while i <= #argv do
local a = argv[i]
if (a == "-m") or (a == "--map-file") then
-- only draw trains – requires specifying an already drawn file
i = i+1
if not argv[i] then
error(("missing filename after `%s'"):format(a))
end
mappath = argv[i]
elseif (a == "-t") or (a == "--no-trains") then
-- do not draw trains
no_trains = true
elseif (a == "-w") or (a == "--world-image") then
-- overlay over world image
i = i+1
if not argv[i] then
error(("missing filename after `%s'"):format(a))
end
worldimage = argv[i]
else
datapath = a
end
i = i + 1
end
return datapath, mappath, no_trains, worldimage
end
datapath, mappath, no_trains, worldimage = parse_args(arg)
-- Load saves
local file, err = io.open(datapath.."advtrains_trains", "r")
local tbl = minetest.deserialize(file:read("*a"))
if type(tbl) ~= "table" then
error("Trains file: not a table")
end
advtrains.trains = tbl
file:close()
--ndb contains the defs, while ndb2 is the actual contents
file, err = io.open(datapath.."advtrains_ndb", "r")
tbl = minetest.deserialize(file:read("*a"))
if type(tbl) ~= "table" then
error("Node database file: not a table")
end
advtrains.ndb.load_data(tbl)
file:close()
-- open svg file
local svgfile = io.open(datapath.."trains.json", "w")
if mappath then
mapfile = io.open(mappath, "r")
cont = mapfile:read("*a"):sub(1, -7) -- remove </svg> end tag
svgfile:write(cont)
else
svgfile:write([[
[
]])
end
-- everything set up. Start generating an SVG
-- All nodes that have been fit into a polyline are removed from the NDB, in order to not draw them again.
-- "Restart points" for the breadth-first traverser (set when more than 2 conns present)
-- {pos = <position>, connid = <int>, conn = <conndef>}
-- Note that the node at "pos" is already deleted from the NDB at the time of recall, therefore "conn" is specified
local bfs_rsp = {}
local ndb_nodes_handled = 0
-- Points of the current polyline. Inserted as xyz vectors, maybe we'll use the y value one day
local current_polyline = {}
-- Traverser function from interlocking, highly modified
local function gen_rsp_polyline(rsp)
-- trick a bit
local pos, connid, conns = rsp.pos, 1, {rsp.conn}
current_polyline[#current_polyline+1] = pos
while true do
local adj_pos, adj_connid, conn_idx, nextrail_y, next_conns = advtrains.get_adjacent_rail(pos, conns, connid)
if not adj_pos then
-- proceed one more node, for seamless turnout transitions
current_polyline[#current_polyline+1] = advtrains.pos_add_dir(pos, conns[connid].c)
return
end
-- continue traversing
local conn_mainbranch
for nconnid, nconn in ipairs(next_conns) do
if adj_connid ~= nconnid then
if not conn_mainbranch then
--use the first one found to continue
conn_mainbranch = nconnid
--writec(nconnid.." nconn mainbranch")
else
-- insert bfs reminders for other conns
table.insert(bfs_rsp, {pos = adj_pos, connid = nconnid, conn = nconn})
--writec(nconnid.." nconn bfs")
end
end
end
-- save in polyline and delete from ndb
--writec("Saved pos: "..pts(adj_pos).." mainbranch cont "..conn_mainbranch.." nextconns "..atdump(next_conns))
current_polyline[#current_polyline+1] = adj_pos
advtrains.ndb.clear(adj_pos)
ndb_nodes_handled = ndb_nodes_handled + 1
pos, connid, conns = adj_pos, conn_mainbranch, next_conns
end
end
plcnt = 0
local function poly_angle(l, e)
local dx = (e.x - l.x)
local dz = (e.z - l.z)
return math.deg(math.atan2(dz, dx))
end
local function polyline_write(pl)
local str = {}
table.insert(str, '{"type":"Feature","geometry":{"type":"LineString","coordinates":[')
local i
local e = nil
local l = nil
local last_angle = -1000
local lastcf = p1y
local lastldir = {x=0, y=0}
local consider = 0
--print("new polyline\n")
for i=1,#pl do
local first = true
consider = 0
e = pl[i]
-- print("point " .. e.x .. "x" .. e.z .. "x" .. e.y)
if (l ~= nil) then
local angle = poly_angle(l, e)
if (angle ~= last_angle) then
table.insert(str, "[".. l.x .. "," .. (l.z) .. "],")
last_angle = angle
end
end
l = e
end
if (e ~= nil) then
table.insert(str, "[".. l.x .. "," .. (l.z) .. "]")
end
table.insert(str, ']},"properties":{"name":""}},\n')
svgfile:write(table.concat(str))
plcnt = plcnt + 1
end
-- while there are entries in the nodedb
-- 1. find a starting point
if not mappath then
local stpos, conns = advtrains.ndb.mapper_find_starting_point()
while stpos do
--print("Restart at position "..pts(stpos))
for connid, conn in ipairs(conns) do
table.insert(bfs_rsp, {pos = stpos, connid = connid, conn = conn})
end
advtrains.ndb.clear(stpos)
-- 2. while there are BFS entries
while #bfs_rsp > 0 do
-- make polylines
local current_rsp = bfs_rsp[#bfs_rsp]
bfs_rsp[#bfs_rsp] = nil
--print("Starting polyline at "..pts(current_rsp.pos).."/"..current_rsp.connid)
current_polyline = {}
gen_rsp_polyline(current_rsp)
polyline_write(current_polyline)
--break
io.write("Progress ", ndb_nodes_handled, "+", ndb_nodes_notrack, "/", ndb_nodes_total, "=", math.floor(((ndb_nodes_handled+ndb_nodes_notrack)/ndb_nodes_total)*100), "%\r")
end
stpos, conns = advtrains.ndb.mapper_find_starting_point()
--break
end
end
svgfile:write("{}]")
svgfile:close()
print("\nWrote",plcnt,"polylines. Processed", ndb_nodes_handled, "track,",ndb_nodes_notrack, "non-track nodes out of", ndb_nodes_total)