[Jts-topo-suite-user] bug: lose accuracy on buffer operations?!

[Robin W. <rob...@gm...>]

Hi all,

when buffering a geometry (fixed precision model), the resulting 
geometry has less decimal digits as input.

Is this a bug, or what I'm doing wrong here ?

in use: jts version 1.12

example code:

     GeometryFactory geometryFactory = new GeometryFactory(new 
PrecisionModel(100000));

     Point point = geometryFactory.createPoint(new 
Coordinate(10.123456,20.123456));
     System.out.println(point.toString());
     PrecisionModel precisionModel = point.getFactory().getPrecisionModel();
     System.out.println("point, precision model : " + 
precisionModel.getType().toString() + " (" +
     precisionModel.getMaximumSignificantDigits()+ ")");

     Geometry buffer = point.buffer(2.0,1);
     System.out.println(buffer.toString());
     precisionModel = buffer.getFactory().getPrecisionModel();
     System.out.println("buffer, precision model : " + 
precisionModel.getType().toString() + " (" +
     precisionModel.getMaximumSignificantDigits()+ ")");


example output:

     POINT (10.123456 20.123456)
     point, precision model : FIXED (6)
     POLYGON ((12.12346 20.12346, 10.12346 18.12346, 8.12346 20.12346, 
10.12346 22.12346, 12.12346 20.12346))
     buffer, precision model : FIXED (6)


Robin