[mapserver-users] layertype CHART - how to get the pie chart for a specific polygon

[Arnd Wippermann]

Hi,

i use the layertype CHART to display the results of the election in nrw 2010
for the electoral districts. It works great. The layer shows perfectly the
pie charts for every polygon.

http://gis.ibbeck.de/ginfo/apps/Landtagswahl_NRW_2010/Wahlen_NRW_2010.asp

But is it possible to get the pie chart for a specific polygon? I want to
display the pie chart i.e in a query like this:

http://gis.ibbeck.de/include/mapserv52/mapserv.exe?map=ginfo/apps/Landtagswa
hl_NRW_2010/Landtagswahl_NRW_2010.map&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetF
eatureInfo&QUERY_LAYERS=WKNR&LAYERS=WKNR&BBOX=965552.54116394,6743580.382492
7,980839.94681885,6758867.7881476&SRS=EPSG:900913&X=50&Y=50&WIDTH=100&HEIGHT
=100&FORMAT=image/png&INFO_FORMAT=text/html&FEATURE_COUNT=1&STYLES=

I have managed this in the template by use of <img src="WMS Request"> and
&BBOX=[shpext format="$minx,$miny,$maxx,$maxy"] in the WMS request for the
pie chart. And adjust of image width and pie chart size.

If the polygon has a polygon inside (isle), then this approach doesn't work,
because I get two pie charts:

http://gis.ibbeck.de/include/mapserv52/mapserv.exe?map=ginfo/apps/Landtagswa
hl_NRW_2010/Landtagswahl_NRW_2010.map&&SERVICE=WMS&VERSION=1.1.1&REQUEST=Get
FeatureInfo&QUERY_LAYERS=WKNR&LAYERS=WKNR&BBOX=951105.94282005,6738535.53862
66,966393.34847496,6753822.9442815&SRS=EPSG:900913&X=50&Y=50&WIDTH=100&HEIGH
T=100&FORMAT=image/png&INFO_FORMAT=text/html&FEATURE_COUNT=1&STYLES= 


I would like to get the specific pie chart by the district number and cgi
substitution. That would mean, that one get a better control of displaying
the pies in an own context.

  CLASS
    EXPRESSION ([F12]=%WKNR%)
    NAME 'CDU' #F10
    STYLE
        SIZE [F10]
        COLOR 0 0 255 #000000
        #OUTLINECOLOR 0 0 0
        #WIDTH 1
    END
  END

But that doesn't work. Is there an other way possible?


Regards
Arnd Wippermann
http://gis.ibbeck.de/