Oh, no, now you got me going . . .
You could use the same process of stacking things by using two lines on
top of one another, place a white line (we use white as a Transparent
color here by default) on top of a slightly wider line of a different
color, this will in effect give you two side by side lines (rails), then
place the "tie" (really wide, scrunched up dashed line) on top to get
the Railroad Ties to loo right.
Basically display the same line three time, Color for rails, then on top
of that, a transparent color slightly narrower in width, then the Dashed
line type on top of that that is wider than the rail line, and you have
real look Railroad tracks.
bobb
Bill Thoen wrote:
I see what I did wrong... you need to include an OVERLAYCOLOR parameter
in the CLASS object to get this to show the 'tie' symbol (the example on
the wiki at http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?SymbolExamples
leaves this out too, and so it doesn't work either). I tied to fix that
but I couldn't get edit access to the wiki (and BTW, the word
"illusive" on that page should probably be "elusive" if anyone's feeling
pedantic and is able to make some edits there).
What it does is drop a dashed line over the solid line with the dashed
line set to be 3 times thicker than the solid line. Since the dash
pattern is 1 pixel followed by 3 empty ones this has the effect of
creating a line like a string of square beads (e.g. ---o---o---o---o).
It looks okay, but it's not the classic cartographic symbol for railroads.
Has anyone come up with something better?
Bill Thoen wrote:
It seems that line styles for railroads (i.e. lines that look like
---|--|--|--|--) are pretty hard to find in the documentation. I did
find one googlit on the subject from 2003
(http://mapserver.gis.umn.edu/data2/wilma/mapserver-users/0302/msg00716.html)
but I can't seem to make it work. The following map file excerpt built
from that suggestion just seems to produce a simple red line. I don't
see how this makes the "tie" lie crossways to the track line. Does
anyone know what I did wrong? Is there a more modern solution?
MAP
...
SYMBOL
NAME 'line'
TYPE ELLIPSE
FILLED TRUE
POINTS 1 1 END
END
SYMBOL
NAME 'tie'
TYPE ELLIPSE
FILLED TRUE
POINTS 1 1 END
STYLE 1 3 END
END
...
LAYER
NAME railroads
GROUP transportation
TYPE LINE
STATUS ON
CONNECTIONTYPE OGR
CONNECTION "railroads.TAB"
LABELITEM "Name"
CLASS
NAME "Railroads"
COLOR 255 100 100
SYMBOL 'line'
SIZE 1
OVERLAYSYMBOL 'tie'
OVERLAYSIZE 3
END
PROJECTION
"init=epsg:4326"
END
END
...
END
TIA,
- Bill Thoen
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