Currently the best method I've found is the one explained here
http://stackoverflow.com/questions/4129241/split-a-polygon-with-a-linestring-in-jts
To that algorithm I added a for-loop to remove the annulus "hole" geometry
appearing together with slices in the result.
Here an excerpt of the code:
ArrayList<LineString> slices = new ArrayList<LineString>();
/* ...
evaluating slices
... */
Geometry collection = Utils.createGeometryCollection(new Geometry[]{annulus,
Utils.createMultiLineString(slices)});
LineMerger lineMerger = new LineMerger();
lineMerger.add(collection);
UnaryUnionOp op = new UnaryUnionOp(lineMerger.getMergedLineStrings());
Geometry geom1 = op.union();
Polygonizer polygonizer = new Polygonizer();
polygonizer.add(geom1);
Collection<Geometry> resultCollection = polygonizer.getPolygons();
Iterator<Geometry> iterator = resultCollection.iterator();
while(iterator.hasNext())
{
Geometry g = (Geometry)iterator.next();
if(g.contains(centroid))
iterator.remove();
}
Geometry[] result = (Geometry[])resultCollection.toArray(new Geometry[0]);
Bye
Sandro
Nella citazione in data Thu Mar 20 09:31:36 2014, Sandro Zacchino ha scritto:
>
> Hi,
>
> I'm looking for an efficient way to cut an 2D annulus (that is a polygon with
> an hole, a donut) in slices. In particular I have a collection of segments
> that represents all the cuts I have to do on the annulus and, as a result, I
> need a collection of closed polygons, one for each portion of the annulus I
> obtain from the cutting operation.
>
> Thank you in advance
>
> Sandro
>
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