Re: [Geotools-gt2-users] PositionFactory problems: what am I missing?

[Andy C. <gt...@gm...>]

I eventually got it to work by directly creating various Impl objects
rather than using factories. I know that's not the best way, but I
can't figure out which factories to use without getting exceptions.

Anyway, it's not giving me the result I would expect. What am I doing
wrong here?

---
		PositionFactory posF = new PositionFactoryImpl(DefaultGeographicCRS.WGS84);
		PrimitiveFactory primF = new PrimitiveFactoryImpl(DefaultGeographicCRS.WGS84);
		Point[] ringPoints = new Point[] {
				new PointImpl(posF.createDirectPosition(new double[] {40, -100})),
				new PointImpl(posF.createDirectPosition(new double[] {40, -90})),
				new PointImpl(posF.createDirectPosition(new double[] {30, -90})),
				new PointImpl(posF.createDirectPosition(new double[] {30, -100})),
				new PointImpl(posF.createDirectPosition(new double[] {40, -100}))
			};

		Ring r = primF.createRing(Arrays.asList(ringPoints));
		Polygon p = new PolygonImpl(primF.createSurfaceBoundary(r,
Collections.EMPTY_LIST));
		DirectPosition pos = posF.createDirectPosition(new double[] {35, -95});
		Point pt = new PointImpl(pos);
		System.out.println("Is "+pt+" in "+r+"? "+r.contains(pt));
---

The output is:

Is org.geotools.geometry.jts.spatialschema.geometry.primitive.PointImpl@4898424d
in org.geotools.geometry.jts.spatialschema.geometry.primitive.RingImpl@19cc1b?
false

(35,-95) should easily be inside the polygon, so either I'm doing
something wrong (my guess) or there's a bug somewhere.

Thanks,

Andy

On Tue, Mar 24, 2009 at 11:42, Andy Cox <gt...@gm...> wrote:
> Sorry I was executing the wrong class in Eclipse when I got that exception.
>
> However, I did try a full point-in-polygon example (my main goal here)
> and got that exception. Here's my sample code:
>
> ---
> PositionFactory posF = new PositionFactoryImpl(DefaultGeographicCRS.WGS84);
> PrimitiveFactory primF = new PrimitiveFactoryImpl(DefaultGeographicCRS.WGS84);
> GeometryFactory geomF = new JTSGeometryFactory(DefaultGeographicCRS.WGS84);
>
> PointArray points = posF.createPointArray();
>
> DirectPosition[] ringPoints = new DirectPosition[] {
>                posF.createDirectPosition(new double[] {40, -100}),
>                posF.createDirectPosition(new double[] {40, -90}),
>                posF.createDirectPosition(new double[] {30, -90}),
>                posF.createDirectPosition(new double[] {30, -100}),
>                posF.createDirectPosition(new double[] {40, -100}),
>        };
>
> Ring r = primF.createRing(Arrays.asList(ringPoints));
>
> DirectPosition pt = posF.createDirectPosition(new double[] {35, -95});
> System.out.println("Is "+pt+" in "+r+"? "+r.contains(pt));
> ---
>
> Running this gives the same exception as in my previous example:
>
> Exception in thread "main" java.lang.ClassCastException:
> org.geotools.geometry.jts.spatialschema.geometry.DirectPositionImpl
>        at org.geotools.geometry.jts.spatialschema.geometry.complex.ComplexImpl.computeJTSPeer(ComplexImpl.java:150)
>        at org.geotools.geometry.jts.spatialschema.geometry.GeometryImpl.getJTSGeometry(GeometryImpl.java:152)
>        at org.geotools.geometry.jts.spatialschema.geometry.GeometryImpl.contains(GeometryImpl.java:506)
>        at my code...
>
> Am I doing something wrong, or is this a library problem?