A few more notes to the general community (unless I'm the only one running
into these problems; please correct me if I'm mistaken on any of this):
- Point feature types are dependent upon a "location" attribute that is
an instance of com.vividsolutions.jts.geom.Point
- LineString feature types are dependent upon a "route" attribute that is
an instance of com.vividsolutions.jts.geom.LineString
I was able to get my line features to display by putting them on another
layer with a new style (essentially a cut-paste of the Rule/Filter from the
primary Point style). I'm starting to wonder if there is some sort of
constraint on Rules that they can only be applied to one geometry type. I
realize that thought may not make sense, and Michael's previous email states
otherwise, but I just haven't found a way to have Rules for features of
different geometry types in the same Style on the same MapLayer. I
struggled with Michael's suggestion for a short while before taking the "new
layer" approach, but I'd still like to do things the "right way," or at
least a little bit closer to the "good enough" way. Might get back to that
in a bit now that I've got something to show for now. (gotta love software
for that, huh?)
Ciao for now,
Brian
On Thu, May 13, 2010 at 10:14 AM, Brian Ghigiarelli <briang...@gmail.com>wrote:
> 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
>
--
Brian Ghigiarelli
570-878-9139
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