Re: [Jts-topo-suite-user] question about GeometryNoder

[Martin D. <mtn...@te...>]

This is indeed a bug in GeometryNoder (or more accurately 
MCIndexSnapRounder).  Now fixed in SVN (with better test case logic added).

On 5/8/2012 3:21 AM, Tomas F wrote:
> Hi,
> It looks like GeometryNoder doesn't snap a line to a close endpoint of 
> another line. I this correct behaviour?
> I thought that an endpoint of a line is a hot pixel so that all lines 
> that crosses the grid-square of that hot pixel
> should snap. The following program illustrates my point:
>
> double scale = 1.0;
> WKTReader reader = new WKTReader();
>
> LineString lineStringA =
>         (LineString) reader.read("LINESTRING (0.0 0.0, 2.0 0.0)");
> LineString lineStringB =
>         (LineString) reader.read("LINESTRING (0.0 0.0, 10.0 -1.0)");
>
> List<LineString> lineStrings = new ArrayList<LineString>();
> lineStrings.add(lineStringA);
> lineStrings.add(lineStringB);
>
> PrecisionModel precisionModel = new PrecisionModel(scale);
> GeometryFactory  geometryFactory = new GeometryFactory(precisionModel);
> GeometryNoder noder =
>         new GeometryNoder(geometryFactory.getPrecisionModel());
>
> List list = noder.node(lineStrings);
>
> double distanceToHotPixel =
>         lineStringB.distance(lineStringA.getEndPoint());
> System.out.println("Distance between assumed hotpixel and "
>                    + " lineStringB: " + distanceToHotPixel);
>
> for (Object obj : list)
> {
>     LineString lineString = (LineString) obj;
>     assert !lineString.equalsExact(lineStringB) :
>             "Isn't (2.0, 0.0) a hot pixel and isn't lineStringB "
>             + "close enough to be snapped?";
> }
>
> Thanks in advance,
> Tomas
>
>
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