G'day;
Withing a single "layer" the order in which content is drawn is based on
the Style object; the style object consists of a list of
FeatureTypeStyle objects - each one of which is drawn in order. The
FeatureTypeStyle will only engage if the name matches; FeatureTypes form
a heirarchy - normally we use the generic "Feature" - but you can be
more specific and list the name of your exact FeatureType.
Within a FeatureType style there are rules (where you can define your
own filters to determine when to draw) as well as a list of Symbolizers
which define what colors, labels and so on are used for drawing.
You can experiment with all of this within uDig - with no coding. Open
up the style editor and switch over to the XML page. Try changing the
name used for the feature type style to something other than feature and
so on ...
Cheers,
Jody
A complicated alernative (since you have a drawing implemenation
already) would be to take your custom JUMP rendering code and port it to
the Renderer api. You can use the rendering metrics factory to ensure
the render is only used for your content. I don't normally recommend
this but since you have some drawing code already ...
Wellmann, Harald wrote:
I am writing a pluging for a proprietary file format containing
different feature types. In that file format, the features are sorted
according to drawing order (background to foreground).
I would like to work with the BasicFeatureRenderer and a Theme Style to
draw the features in type-dependent colors in the right order. I would
like to AVOID creating a separate layer for each feature type.
This used to work in JUMP, but I'm not sure whether uDig's design
supports this approach. Does a themed style iterate over the features
and then determine the style per feature, or does it first filter for
all features matching a given attribute value and then draw all
corresponding features, which effectively rearranges the sorting order
of the feature collection?
In the second case, I would need to make sure that the Renderer selects
the attributes in the correct order...
Regards,
Harald
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User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
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_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
