diff options
Diffstat (limited to 'main.lua')
| -rw-r--r-- | main.lua | 63 |
1 files changed, 58 insertions, 5 deletions
@@ -5,13 +5,24 @@ local maxc = 5000 -- embed an image called "world.png" -local wimg = true +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} +-- Maximum y level drawn +local drmaxy = 70 +-- Color of max y level +local colmaxy = {r=255, g=0, b=0} + + datapath = (arg[1] or "").."/" @@ -111,7 +122,7 @@ svgfile:write('viewBox="'..(-maxc)..' '..(-maxc)..' '..(2*maxc)..' '..(2*maxc).. svgfile:write([[ -<circle cx="0" cy="0" r="2" stroke="red" stroke-width="1" /> +<circle cx="0" cy="0" r="5" stroke="red" stroke-width="1" /> ]]) if wimg then @@ -183,16 +194,58 @@ end plcnt = 0 + +local function hexcolor(clr) + return "#"..advtrains.hex(clr.r)..advtrains.hex(clr.g)..advtrains.hex(clr.b) +end + +local function cfactor(ry) + local y = ry - (ry%4) + + local fac = (y-drminy)/(drmaxy-drminy) + return fac +end + +local function pl_header(fac) + + local color = { + r = colminy.r + (colmaxy.r-colminy.r)*fac, + g = colminy.g + (colmaxy.g-colminy.g)*fac, + b = colminy.b + (colmaxy.b-colminy.b)*fac, + } + + local c = hexcolor(color) + return '<polyline style="fill:none;stroke:'..c..';stroke-width:1" points="' +end + local function polyline_write(pl) - local str = {'<polyline style="fill:none;stroke:black;stroke-width:1" points="'} + local p1y = cfactor(pl[1].y) + local str = {pl_header(p1y)} local i local e + local lastcf = p1y 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) .. " ") + local cf = cfactor(e.y) + if cf ~= lastcf then + if lastcf <= 1 and lastcf >= 0 then + -- insert final point + -- Note that we mirror y, so positive z is up + table.insert(str, e.x .. "," .. -(e.z) .. " ") + table.insert(str, '" />\n') + plcnt = plcnt + 1 + end + if cf <= 1 and cf >= 0 then + table.insert(str, pl_header(cf)) + end + end + if cf <= 1 and cf >= 0 then + -- Note that we mirror y, so positive z is up + table.insert(str, e.x .. "," .. -(e.z) .. " ") + end + lastcf = cf end table.insert(str, '" />\n') |