lifo-advtrains_netmapper/main.lua

232 lines
5.7 KiB
Lua

-- 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
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")
-- Load saves
local file, err = io.open(datapath.."advtrains", "r")
local tbl = minetest.deserialize(file:read("*a"))
if type(tbl) ~= "table" then
error("not a table")
end
if tbl.version then
advtrains.ndb.load_data(tbl.ndb)
else
error("Incompatible save format!")
end
file:close()
-- open svg file
local svgfile = io.open(datapath.."out.svg", "w")
svgfile:write([[
<?xml version="1.0" standalone="no" ?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg width="1024" height="800" xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" ]])
svgfile:write('viewBox="'..(-maxc)..' '..(-maxc)..' '..(2*maxc)..' '..(2*maxc)..'" >')
svgfile:write([[
<circle cx="0" cy="0" r="2" stroke="red" stroke-width="1" />
]])
if wimg then
local wimx = -(wimresx*wimscale/2)
local wimy = -(wimresy*wimscale/2)
local wimw = wimresx*wimscale
local wimh = wimresy*wimscale
svgfile:write('<image xlink:href="world.png" x="'..wimx..'" y="'..wimy..'" height="'..wimh..'px" width="'..wimw..'px"/>')
end
local function writec(text)
print(text)
svgfile:write("<!-- " .. text .. " -->\n")
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 = {}
-- 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
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)
pos, connid, conns = adj_pos, conn_mainbranch, next_conns
end
end
local function polyline_write(pl)
local str = {'<polyline style="fill:none;stroke:black;stroke-width:1" points="'}
local i
local e
local lastldir = {x=0, y=0}
for i=1,#pl do
e = pl[i]
-- Note that we mirror y, so positive z is up
table.insert(str, e.x .. "," .. -(e.z) .. " ")
end
table.insert(str, '" />\n')
svgfile:write(table.concat(str))
end
-- while there are entries in the nodedb
-- 1. find a starting point
local stpos, conns = advtrains.ndb.mapper_find_starting_point()
while stpos do
writec("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)
end
stpos, conns = advtrains.ndb.mapper_find_starting_point()
end
svgfile:write("</svg>")
svgfile:close()