[maplab-users] How do you display a layer by attribute?

[Zak James]

Ken,

You need to specify a separate class for each value or value range of 
the attribute that you want to differentiate. Multiple Style objects 
are used within each class to build layered symbolization (for instance 
a star within a circle for point markers or a fill with a contrasting 
outline for polygons). One serious bug that I can warn you about: don't 
give a Style a name in Mapedit or it will break your mapfile. This 
problem will be addressed in the upcoming release.

zak

--
Zak James
Applications and Software Development
DM Solutions Group Inc.
http://www.dmsolutions.ca

On Jun 25, 2004, at 1:05 PM, Ken Sanderson wrote:

> Hello all.
>
> How do you set up a map file through map edit to display a layer by an
> attribute value. So for example if I have a field called TYPE and in
> that field you can have a value of 1-4. I then want to display all 1's
> as red, 2's as blue, 3's as green, 4's as yellow on the map.
>
> How do I go about setting that up? I assumed that I would set ClassItem
> to TYPE, but not sure how to go about defining a style object for each
> value type could be?
>
> Thanks,
>
> Ken
>
>
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