lol Jody... I spent ten hours trying to figure it out... and didn't see the
easier way. Please let me know how can I invite you to take a beer :-)
jv
On Thu, Jun 2, 2011 at 2:43 AM, Jody Garnett <[email protected]> wrote:
> Dude you are working *way* to hard - let geotools do the work for you!
>
> It automatically knows it is looking for a color; and will convert your
> string value to a colour as needed.
> So a simple ff.proeprty("column") will suffice; as long as the values can
> be parsed as a color.
>
> For more information on why your function did not work; you needed to
> register it with the system (so it can for example copy it (which is what
> DuplicatingFilterVisitor is doing). It looks like we did not trust you to
> modify the filter as it was being used for rendering - so they made a copy.
>
> There is a tutorial on making functions here (and registering them for the
> library):
> -
> http://docs.geotools.org/latest/userguide/tutorial/advanced/function.html
>
> (Note this tutorial is "Advanced" as it involves you contributing a new
> idea to geotools; and not simply using what is there)
>
>
>
> --
> Jody Garnett
>
> On Thursday, 2 June 2011 at 7:23 AM, Javier Moreno wrote:
>
> Argh... looks like in fact the problem is somewhere else, throwing an
> exception like this one:
>
> java.lang.RuntimeException: Unable to find function Color
> at
> org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:177)
> at org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:74)
> at
> org.geotools.filter.FilterFactoryImpl.function(FilterFactoryImpl.java:467)
> at
> org.geotools.filter.visitor.DuplicatingFilterVisitor.visit(DuplicatingFilterVisitor.java:309)
> at
> org.geotools.filter.FunctionExpressionImpl.accept(FunctionExpressionImpl.java:147)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.copy(DuplicatingStyleVisitor.java:420)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.visit(DuplicatingStyleVisitor.java:669)
> at org.geotools.styling.FillImpl.accept(FillImpl.java:199)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.copy(DuplicatingStyleVisitor.java:451)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.visit(DuplicatingStyleVisitor.java:878)
> at org.geotools.styling.MarkImpl.accept(MarkImpl.java:204)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.copy(DuplicatingStyleVisitor.java:523)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.copy(DuplicatingStyleVisitor.java:851)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.visit(DuplicatingStyleVisitor.java:818)
> at org.geotools.styling.GraphicImpl.accept(GraphicImpl.java:367)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.copy(DuplicatingStyleVisitor.java:439)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.visit(DuplicatingStyleVisitor.java:724)
> at
> org.geotools.styling.visitor.UomRescaleStyleVisitor.visit(UomRescaleStyleVisitor.java:180)
> at
> org.geotools.styling.PointSymbolizerImpl.accept(PointSymbolizerImpl.java:91)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.copy(DuplicatingStyleVisitor.java:537)
> at
> org.geotools.styling.visitor.DuplicatingStyleVisitor.visit(DuplicatingStyleVisitor.java:275)
> at
> org.geotools.renderer.lite.StreamingRenderer.rescaleFeatureTypeStyle(StreamingRenderer.java:1846)
> at
> org.geotools.renderer.lite.StreamingRenderer.applyUnitRescale(StreamingRenderer.java:1824)
> at
> org.geotools.renderer.lite.StreamingRenderer.processStylers(StreamingRenderer.java:1774)
> at
> org.geotools.renderer.lite.StreamingRenderer.paint(StreamingRenderer.java:707)
> at
> org.geotools.renderer.lite.StreamingRenderer.paint(StreamingRenderer.java:533)
>
>
> On Wed, Jun 1, 2011 at 11:09 PM, Javier Moreno <[email protected]>wrote:
>
> Hi everybody!
>
> I'm trying to stylish a shape and I would like to draw the points with the
> color that is written in a feature attribute. The name of the attribute is
> "FILL" and its value is just a rgb triplet string ("#A0A0A0", for example).
>
> I've been looking at the documentation and as far as I can understand it
> should result in something like this (based on an example of the doc):
>
> class ColorFunction extends FunctionExpressionImpl {
> public static final FunctionName NAME = new
> FunctionNameImpl("Colorizador", 0);
> public ColorFunction() {
> super("Color", filterFactory.literal("Color"));
> super.fallback =
> CommonFactoryFinder.getFilterFactory2(null).literal(Color.WHITE);
> }
> @Override
> public int getArgCount() {
> return 0;
> }
>
> @Override
> public Object evaluate(SimpleFeature feature) {
> String fill = (String) feature.getAttribute("FILL");
> ...
> Color color = new Color(...);
> return color;
> }
> }
>
> class XXX {
> ...
> public Style getStyle() {
> style = styleFactory.createStyle();
> FeatureTypeStyle fts = styleFactory.createFeatureTypeStyle(
> new Rule[]{ this.createRule("dummy", 10); }
> style.featureTypeStyles().add(fts);
> return style;
> }
>
> protected Rule createRule(String name, int size) {
> ColorFunction colorFn = new ColorFunction();
>
> Graphic gr = styleFactory.createDefaultGraphic();
> Mark mark = styleFactory.getCircleMark();
> mark.setStroke(styleFactory.createStroke(
>
> colorFn, filterFactory.literal(1), filterFactory.literal(0.5)));
> mark.setFill(styleFactory.createFill(
> colorFn, filterFactory.literal(1),
> filterFactory.literal(0.3), null));
> gr.graphicalSymbols().clear();
> gr.graphicalSymbols().add(mark);
> gr.setSize(filterFactory.literal(size));
> Rule rule = styleFactory.createRule();
> PointSymbolizer sym = styleFactory.createPointSymbolizer(gr, null);
> rule.setName(name);
> rule.symbolizers().add(sym);
> return rule;
> }
> }
>
> If I've understood it right once applied the StreamingRenderer should
> invoke the ColorFunction evaluate(...) method for each point instance but
> looks like it's never call and I'm running out of ideas. Could someone tell
> me what's happening? Maybe am I absolutely wrong about the way this should
> be implemented?
>
> Thanks in advance!
>
> jv
>
>
>
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