Add trashy geojson exporter
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geojson.lua
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305
geojson.lua
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-- advtrains track map generator
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-- Usage: lua main.lua path/to/world
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-- Viewport maximum coordinate in all directions
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local maxc = 5000
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-- embed an image called "world.png"
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local wimg = false
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-- image file resolution (not world resolution!)
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local wimresx = 3000
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local wimresy = 3000
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-- one pixel is ... nodes
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local wimscale = 4
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-- y ranges and line colors
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-- Minimum y level drawn
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local drminy = -30
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-- Color of min y level
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local colminy = {r=0, g=0, b=255}
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-- Intermediate color
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local colmedy = {r=255, g=0, b=0}
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-- Maximum y level drawn
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local drmaxy = 80
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-- Color of max y level
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local colmaxy = {r=255, g=255, b=0}
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datapath = (arg[1] or "").."/"
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--Constant for maximum connection value/division of the circle
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AT_CMAX = 16
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advtrains = {}
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minetest = {}
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core = minetest
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--table for track nodes/connections
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trackconns = {}
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-- math library seems to be missing this function
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math.hypot = function(a,b) return math.sqrt(a*a + b*b) end
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-- need to declare this for trackdefs
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function attrans(str) return str end
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-- pos to string
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local function pts(pos)
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return pos.x .. "," .. pos.y .. "," .. pos.z
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end
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--Advtrains dump (special treatment of pos and sigd)
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function atdump(t, intend)
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local str
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if type(t)=="table" then
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if t.x and t.y and t.z then
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str=minetest.pos_to_string(t)
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elseif t.p and t.s then -- interlocking sigd
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str="S["..minetest.pos_to_string(t.p).."/"..t.s.."]"
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else
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str="{"
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local intd = (intend or "") .. " "
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for k,v in pairs(t) do
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if type(k)~="string" or not string.match(k, "^path[_]?") then
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-- do not print anything path-related
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str = str .. "\n" .. intd .. atdump(k, intd) .. " = " ..atdump(v, intd)
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end
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end
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str = str .. "\n" .. (intend or "") .. "}"
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end
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elseif type(t)=="boolean" then
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if t then
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str="true"
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else
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str="false"
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end
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elseif type(t)=="function" then
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str="<function>"
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elseif type(t)=="userdata" then
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str="<userdata>"
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else
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str=""..t
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end
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return str
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end
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dofile("vector.lua")
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dofile("serialize.lua")
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dofile("helpers.lua")
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dofile("tracks.lua")
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dofile("track_defs.lua")
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dofile("nodedb.lua")
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function parse_args(argv)
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local i = 1
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local no_trains = false
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local datapath, mappath, worldimage
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while i <= #argv do
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local a = argv[i]
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if (a == "-m") or (a == "--map-file") then
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-- only draw trains – requires specifying an already drawn file
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i = i+1
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if not argv[i] then
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error(("missing filename after `%s'"):format(a))
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end
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mappath = argv[i]
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elseif (a == "-t") or (a == "--no-trains") then
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-- do not draw trains
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no_trains = true
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elseif (a == "-w") or (a == "--world-image") then
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-- overlay over world image
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i = i+1
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if not argv[i] then
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error(("missing filename after `%s'"):format(a))
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end
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worldimage = argv[i]
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else
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datapath = a
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end
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i = i + 1
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end
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return datapath, mappath, no_trains, worldimage
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end
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datapath, mappath, no_trains, worldimage = parse_args(arg)
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-- Load saves
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local file, err = io.open(datapath.."advtrains_trains", "r")
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local tbl = minetest.deserialize(file:read("*a"))
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if type(tbl) ~= "table" then
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error("Trains file: not a table")
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end
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advtrains.trains = tbl
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file:close()
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--ndb contains the defs, while ndb2 is the actual contents
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file, err = io.open(datapath.."advtrains_ndb", "r")
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tbl = minetest.deserialize(file:read("*a"))
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if type(tbl) ~= "table" then
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error("Node database file: not a table")
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end
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advtrains.ndb.load_data(tbl)
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file:close()
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-- open svg file
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local svgfile = io.open(datapath.."trains.json", "w")
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if mappath then
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mapfile = io.open(mappath, "r")
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cont = mapfile:read("*a"):sub(1, -7) -- remove </svg> end tag
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svgfile:write(cont)
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else
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svgfile:write([[
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[
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]])
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end
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-- everything set up. Start generating an SVG
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-- All nodes that have been fit into a polyline are removed from the NDB, in order to not draw them again.
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-- "Restart points" for the breadth-first traverser (set when more than 2 conns present)
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-- {pos = <position>, connid = <int>, conn = <conndef>}
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-- Note that the node at "pos" is already deleted from the NDB at the time of recall, therefore "conn" is specified
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local bfs_rsp = {}
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local ndb_nodes_handled = 0
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-- Points of the current polyline. Inserted as xyz vectors, maybe we'll use the y value one day
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local current_polyline = {}
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-- Traverser function from interlocking, highly modified
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local function gen_rsp_polyline(rsp)
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-- trick a bit
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local pos, connid, conns = rsp.pos, 1, {rsp.conn}
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current_polyline[#current_polyline+1] = pos
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while true do
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local adj_pos, adj_connid, conn_idx, nextrail_y, next_conns = advtrains.get_adjacent_rail(pos, conns, connid)
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if not adj_pos then
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-- proceed one more node, for seamless turnout transitions
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current_polyline[#current_polyline+1] = advtrains.pos_add_dir(pos, conns[connid].c)
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return
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end
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-- continue traversing
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local conn_mainbranch
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for nconnid, nconn in ipairs(next_conns) do
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if adj_connid ~= nconnid then
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if not conn_mainbranch then
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--use the first one found to continue
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conn_mainbranch = nconnid
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--writec(nconnid.." nconn mainbranch")
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else
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-- insert bfs reminders for other conns
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table.insert(bfs_rsp, {pos = adj_pos, connid = nconnid, conn = nconn})
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--writec(nconnid.." nconn bfs")
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end
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end
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end
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-- save in polyline and delete from ndb
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--writec("Saved pos: "..pts(adj_pos).." mainbranch cont "..conn_mainbranch.." nextconns "..atdump(next_conns))
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current_polyline[#current_polyline+1] = adj_pos
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advtrains.ndb.clear(adj_pos)
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ndb_nodes_handled = ndb_nodes_handled + 1
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pos, connid, conns = adj_pos, conn_mainbranch, next_conns
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end
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end
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plcnt = 0
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local function poly_angle(l, e)
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local dx = (e.x - l.x)
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local dz = (e.z - l.z)
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return math.deg(math.atan2(dz, dx))
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end
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local function polyline_write(pl)
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local str = {}
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table.insert(str, '{"type":"Feature","geometry":{"type":"LineString","coordinates":[')
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local i
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local e = nil
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local l = nil
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local last_angle = -1000
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local lastcf = p1y
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local lastldir = {x=0, y=0}
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local consider = 0
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--print("new polyline\n")
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for i=1,#pl do
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local first = true
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consider = 0
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e = pl[i]
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-- print("point " .. e.x .. "x" .. e.z .. "x" .. e.y)
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if (l ~= nil) then
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local angle = poly_angle(l, e)
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if (angle ~= last_angle) then
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table.insert(str, "[".. l.x .. "," .. (l.z) .. "],")
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last_angle = angle
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end
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end
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l = e
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end
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if (e ~= nil) then
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table.insert(str, "[".. l.x .. "," .. (l.z) .. "]")
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end
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table.insert(str, ']},"properties":{"name":""}},\n')
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svgfile:write(table.concat(str))
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plcnt = plcnt + 1
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end
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-- while there are entries in the nodedb
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-- 1. find a starting point
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if not mappath then
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local stpos, conns = advtrains.ndb.mapper_find_starting_point()
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while stpos do
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--print("Restart at position "..pts(stpos))
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for connid, conn in ipairs(conns) do
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table.insert(bfs_rsp, {pos = stpos, connid = connid, conn = conn})
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end
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advtrains.ndb.clear(stpos)
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-- 2. while there are BFS entries
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while #bfs_rsp > 0 do
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-- make polylines
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local current_rsp = bfs_rsp[#bfs_rsp]
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bfs_rsp[#bfs_rsp] = nil
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--print("Starting polyline at "..pts(current_rsp.pos).."/"..current_rsp.connid)
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current_polyline = {}
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gen_rsp_polyline(current_rsp)
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polyline_write(current_polyline)
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--break
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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")
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end
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stpos, conns = advtrains.ndb.mapper_find_starting_point()
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--break
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end
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end
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svgfile:write("{}]")
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svgfile:close()
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print("\nWrote",plcnt,"polylines. Processed", ndb_nodes_handled, "track,",ndb_nodes_notrack, "non-track nodes out of", ndb_nodes_total)
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