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When testing for a polygon I want to get back all fences that are either completely or partly contained in my polygon. Therefore I test if the returned fences are within my polygon or are not disjoint.
@ApiMethod(name = "polygon", httpMethod = "post", path = "polygon")
public ArrayList < MyFence > queryPolygon(@Named("group") String group, MyPolyLine polyline) {
ArrayList < MyFence > fences = new ArrayList < MyFence > ();
//Get index from Memcache
MemcacheService syncCache = MemcacheServiceFactory.getMemcacheService();
STRtree index = (STRtree) syncCache.get(group); // read from cache
if (index != null) {
//Create coordinate array.
double[][] points = polyline.getCoordinates();
Coordinate[] coordinates = new Coordinate[points.length];
int i = 0;
for (double[] point: points) {
Coordinate coordinate = new Coordinate(point[0], point[1]);
coordinates[i++] = coordinate;
}
//Create polygon.
GeometryFactory fact = new GeometryFactory();
LinearRing linear = new GeometryFactory().createLinearRing(coordinates);
Polygon polygon = new Polygon(linear, null, fact);
List < MyPolygon > items = index.query(polygon.getEnvelopeInternal());
if (!items.isEmpty()) {
for (MyPolygon poly: items) {
if (polygon.contains(poly) || !polygon.disjoint(poly)) {
long id = poly.getID();
MyFence newFence = new MyFence();
newFence.setId(id);
fences.add(newFence);
}
}
}
} else {
try {
MyIndex.buildIndex(group);
} catch (IOException e) {
e.printStackTrace();
}
}
return fences;
}
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