Re: [mapserver-users] GD BUG? Negative GAP parameter to rotate vector symbols along line

[Bartłomiej Burkot]

Hallo Users

Indeed with AGG driver rotating of vector symbols work very well. I 
attached the Examle images. So is it a BUG form gd driver?

The GD_GIF_mapserver5_6_1.gif image was rendered with following map 
sections:

OUTPUTFORMAT
    NAME gif
    DRIVER "GD/GIF"
    MIMETYPE "image/gif"
    IMAGEMODE PC256
    EXTENSION "gif"
END

LAYER
    NAME testtest
    STATUS on
    TYPE line
    TRANSFORM false
    FEATURE
        WKT "LINESTRING (0 0, 100 100, 200 100, 300 200, 200 300)"
    END
    CLASS
        STYLE
        ANGLE AUTO
        SYMBOL "zakrzewienie_k1"
        COLOR 0 255 0
        SIZE 18
    END
    STYLE
        COLOR 255 0 0
        WIDTH 1
        END
    END
END

SYMBOL
    NAME "zakrzewienie_k1"
    TYPE VECTOR
    POINTS
        5 0
        2  1
        0 2.5
        2 4
        5 5
        5 5
        2 6
        0 7.5
        2 9
        5 10
    END
    STYLE 1 8 1 18 END
    #SIZE 10
    GAP -99
END


The second image: GD_PNG_mapserver5_6_1.png had such IMAGETYPE:

OUTPUTFORMAT
    NAME png
    DRIVER "GD/PNG"
    MIMETYPE "image/png"
    IMAGEMODE PC256
    EXTENSION "png"
END

The AGG_PNG_mapserver5_6_1.png image displays correctly rotated vector 
symbols.The map file included:

OUTPUTFORMAT
    NAME 'aggpng'
    DRIVER AGG/PNG
    IMAGEMODE RGB #PC256 RGB RGBA BYTE INT16

END

SYMBOL

    NAME "zakrzewienie_k1"
    TYPE VECTOR
    POINTS
        5 0
        2  1
        0 2.5
        2 4
        5 5
        5 5
        2 6
        0 7.5
        2 9
        5 10
    END
    #STYLE 1 8 1 18 END
    #SIZE 10
    GAP -9
END

MapServer version 5.6.1 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP 
OUTPUT=SWF OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=AGG SUPPORTS=FREETYPE 
SUPPORTS=ICONV SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT 
SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER 
SUPPORTS=FASTCGI SUPPORTS=THREADS SUPPORTS=GEOS INPUT=EPPL7 
INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE


I must use GD driver because performance aspects. The agg images are 
more pretty than GD but essentially much bigger than DG images (several 
times). AGG doesn't work with PC256 palettet colors and DG does. The 
rendering time is really much longer than DG.

Exaples:
times: 16ms for GD and 33ms for AGG
sizes: 33KB – GD nad 230KB – AGG

Somebody nows how can I speed up rendering time of AGG images to make it 
so fast than DG?

Or is it a bug of GD driver or I'm doing something wrong? Any ideas to 
solve or workaroud this problem?

Thanks

Bartek

It's supposed to work. If not, you might want to file a bugreport with
a screenshot of what you're getting, but in any case the GD driver in
the 5.x brach won't be getting much attention.
I'd highly suggest using AGG/PNG for any vector symbology rendering.

regards,
thomas

On Thu, Mar 31, 2011 at 08:53, Bartłomiej Burkot
<pomiarowie...@poczta.onet.pl>  wrote:
Any idea why it doesn't work?

Hi thomas
what mapserver version?
what outputformat/renderer?
MapServer version 5.6.5

OUTPUTFORMAT
      NAME gif
      DRIVER "GD/GIF"
      MIMETYPE "image/gif"
      IMAGEMODE PC256
      EXTENSION "gif"
    END

Bartek

--
thomas

On Wed, Mar 30, 2011 at 15:10, Bartłomiej Burkot
<pomiarowie...@poczta.onet.pl>    wrote:
Hi Users

I would like to render a vector symbol along the line in a layer. This
vector symbol should be rotated according to orientation of linesegments
(for example a arrow along one way street). When I use negative GAP with
truetype symbol it work perfectly but I have probelms with vector
symbols to
rotate them.

I use this definition of Symbol but it doesn't work:

SYMBOL
     NAME "testsymbol"
    TYPE VECTOR
   POINTS
     5 0
     2 1
     0 2.5
     2 4
     5 5
     5 5
     2 6
     0 7.5
     2 9
     5 10
   END
     STYLE 1 8 1 18 END
     GAP -99 # doesn't work
END

I read in docu http://mapserver.org/mapfile/symbol.html that:

"When drawing the symbol along a line segment, a negative GAP will will
add
180 degress to the angle. The TrueType and PixMap symbols are always
oriented along the line."

My layer definiton is:

LAYER
   NAME testtest
   STATUS on
   TYPE line
   TRANSFORM false
   FEATURE
     WKT "LINESTRING (0 0, 100 100, 0 100)"
   END
   CLASS

     STYLE
         #ANGLE AUTO
         SYMBOL "testsymbol"
         COLOR 0 255 0
         #SIZE    8
     END
   END
END

Does vectorsymbol play with negative GAP parameter?
Bartek




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