Hi Jeff,
The following code snippets should help...
Geometry geom = (Geometry) feature.getDefaultGeometry();
// this should always be true for a Geometry object from a shapefile
// (using the GeoTools Geometries enum
boolean isMulitPolygon = Geometries.get(geom) == Geometries.MULTIPOLYGON;
// need to allow for the possibility of multiple disjunct polygons
int numPolys = geom.getNumGeometries();
for (int ip = 0; ip < numPolys; ip++) {
Polygon p = (Polygon) geom.getGeometryN(ip);
// get the outer boundary like this
LineString boundary = p.getExteriorRing();
// check for holes
boolean hasHoles = p.getNumInteriorRing() > 0;
// if there are some holes, get the first one
if (hasHoles) {
LineString hole1 = p.getInteriorRingN(0);
}
}
Hope this helps.
Michael
On 18 January 2011 14:16, Jeff Storey <[email protected]> wrote:
> I read a shapefile, and the geometry I read contains multiple polygons, some
> of which are holes. Is there an easy way to determine which are holes and
> which are not? Do I need to check if the vertices are clockwise or
> counterclockwise? Or is there a function in geotools which will
> automatically subtract out the holes and return a new polygon with the holes
> subtracted out?
>
>
>
> Thanks,
>
> Jeff
>
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