The implementation of GAP has been fixed (center to center
distance between symbols), and so has the calculation of
symbol height.
I guess that the following should work:
STYLE
SYMBOL "wavy_line"
WIDTH 1
SIZE 2
GAP -6
COLOR 0 0 0
END
Since you have y values from -1 to 1, and x values between 0
and 6, the ratio between the height of your symbol and the
length is 2 / 6. The ratio between size and gap should be the
same to make the the line continuous.
Håvard
On 8/29/2013 1:31 AM, TC Haddad wrote:
Hello, I'm trying to understand symbol orientation and (maybe) use of
ANCHORPOINT on a line in Mapserver 6.2.
The vector symbol that I have been using for line cartography in MapServer
6.0.3 is below, and I am trying to get the same effect in Mapserver 6.2.1.
SYMBOL
NAME "wavy_line"
TYPE vector
POINTS
0 0
1 1
2 1
3 0
4 -1
5 -1
6 0
END
END
Display in Mapserver 6.0.3:
https://dl.dropboxusercontent.com/u/42845001/mapserver6.0.3.png
Relevant Style bloc from Mapserver 6.0.3:
STYLE
SYMBOL "wavy_line"
WIDTH 1
SIZE 2
GAP -1
COLOR 0 0 0
END
This did not translate directly to Mapserver 6.2.1, but I came close with this:
STYLE
SYMBOL "wavy_line"
WIDTH 1
SIZE 4
GAP 6
COLOR 0 0 0
END
which produced this:
https://dl.dropboxusercontent.com/u/42845001/mapserver6.2.1.png
Obviously I am missing something about how to get the symbol to orient along
the line, I played with ANCHORPOINT as that was new in 6.2 and it seemed like
the default of 0.5 0.5 should work for my symbol, but I also tried several
other value combinations and it seemed to merely shift the symbol around
laterally, while maintaining an upright orientation.
So I'm a bit confused on how to achieve the original effect, (behavior
something like the equivalent of FOLLOW for Labels). Any pointers appreciated...
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--
Håvard Tveite
Department of Mathematical Sciences and Technology, UMB
Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/
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