Thanks, Michael!! This provided a great deal of insight into how filters
and rules work with styles.
I didn't wind up going with the geometry type direction, since I have
multiple types of points that will require different icons (thus, I used a
PropertyIsEqualTo filter on one of the custom featureType properties to
perform the comparison).
I seem to be in the same situation with the display of the lines, however.
All of the rules appear to be set up and functioning properly; however,
LineString features still do not display on the map. I picked up the
dependency on the "route" attribute that contains the LineString.class
instance, but still to no avail.
Below is the rule that I'm adding to the Rule[] for the FeatureTypeStyle.
Anything blatantly wrong with this, or should I perhaps be looking
elsewhere for the bug?
Rule lineRule = sf.createRule();
PropertyIsEqualTo edgeFilter = ff.equal(ff.property("myCustomType"),
ff.literal(MyCustomTypes.EDGE), false); // MyCustomTypes is an ENUM, set via
the SimpleFeatureBuilder
lineRule.setFilter(edgeFilter);
Stroke stroke = sf.createStroke(ff.literal(Color.BLUE),
ff.literal(1.0f));
LineSymbolizer lineSym = sf.createLineSymbolizer(stroke,
geomPropertyName); //geomPropertyName is set to null to use the default
geometry
lineRule.symbolizers().add(lineSym);
I was able to verify that the line features (and all expected attributes)
are being added to the FeatureCollections for the displayed map layers. I
may wind up testing this style concept out on Polygons, in order to see if I
can find some sort of difference in how I'm supposed to deal with points vs.
lines vs. anything else.
Thanks,
Brian
On Wed, May 12, 2010 at 10:58 PM, Michael Bedward <michael.bedw...@gmail.com
> wrote:
> Hello Brian,
>
> I think each of your rules also needs a filter to specify which
> geometry type it is applied to.
>
> The code snippet below is an example of one way in which you might do this.
>
> Hope this helps.
>
> Michael
>
> // Danger ! Completely untested code
>
> // this can be null if it is the default feature geometry
> String geomPropertyName = ...
>
> // external graphic URL
> URL url = ...
>
> StyleFactory sf = CommonFactoryFinder.getStyleFactory(null);
> FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(null);
>
> // create the point rule and give it a filter to identify Point geometry
> type
> Rule pointRule = sf.createRule();
> Function getGeomFn = ff.function("geometryType",
> ff.property(geomPropertyName));
> Filter pointFilter = ff.equals(getGeomFn, ff.literal("Point"));
> pointRule.setFilter(pointFilter);
> pointRule.setElseFilter(false);
>
> // symbolizer for the point rule
> Graphic graphic = sf.getDefaultGraphic();
> graphic.graphicalSymbols().clear();
> ExternalGraphic eGr = sf.createExternalGraphic(url, "image/png");
> graphic.graphicalSymbols().add(eGr);
> Symbolizer sym = sf.createPointSymbolizer(graphic, geomPropertyName);
> pointRule.symbolizers().add(sym);
>
> // create the line rule which doesn't need a filter - it just
> // processes anything skipped by the point rule
> Rule lineRule = sf.createRule();
> lineRule.setIsElseFilter(true);
> Stroke stroke = sf.createStroke(ff.literal(Color.BLUE), ff.literal(1.0f));
> Symbolizer lineSym = sf.createLineSymbolizer(stroke, geomPropertyName);
> lineRule.symbolizers().add(lineSym);
>
> // wrap the rules into a Style
> FeatureTypeStyle fts = sf.createFeatureTypeStyle(new Rule[]{pointRule,
> lineRule});
> Style style = sf.createStyle();
> style.featureTypeStyles().add(fts);
>
> The imports for the above are...
>
> import java.awt.Color;
> import java.net.URL;
> import org.geotools.factory.CommonFactoryFinder;
> import org.geotools.styling.ExternalGraphic;
> import org.geotools.styling.FeatureTypeStyle;
> import org.geotools.styling.Graphic;
> import org.geotools.styling.Rule;
> import org.geotools.styling.Stroke;
> import org.geotools.styling.Style;
> import org.geotools.styling.StyleFactory;
> import org.geotools.styling.Symbolizer;
> import org.opengis.filter.Filter;
> import org.opengis.filter.FilterFactory2;
> import org.opengis.filter.expression.Function;
>
--
Brian Ghigiarelli
570-878-9139
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