[mapguide-users] Proportional symbols ?

[Steve G]

If I understand your question, you want to create graduated symbols based on
attributes in your feature data?  (symbols will show the relative
quantitative differences in the data).  There is a relative easy way to do
this if your data are points and you are using a recent version of Maestro. 
If so, the following steps in Maestro will assist you (assumes you have
already created a data feature source):

1.  Create a layer definition.  
2.  Go to the "Layer Styles" section and you'll find an icon with 3 circles
(Theme Creator).  Click this and it will open the "Theme  Creator".  
3.  Under 'Column' select the feature attribute that will control the size
of the graduated symbols.  You can then choose other options that will
control the number of symbol categories and colors.  
4.  Click OK, it will automatically create rules for each symbol group you
created in the Theme Creator.  
5.  You will then have to edit the style of each symbol rule to change the
size of the symbol.  Assuming that you created rules to show a larger symbol
for a larger number, you will incrementally increase the size of the symbol
(width, height) in the style editor for each symbol rule.  

If your data set is in polygons and you want to show graduated symbols, I
think the best approach would be to create centroids of the polygons first
and then follow the above steps.  You could potentially create symbol
libraries based on symbol definitions:

http://trac.osgeo.org/mapguide/attachment/wiki/MapGuideRfc14/Symbolization.zip
(also search for an AutoDesk whitepaper titled "Building Symbol Libraries
with Autodesk Mapguide Enterprise)

Hope this helps.

-Steve   



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