public static void computeDistance(LineString line, Coordinate pt, PointPairDistance ptDist) {
LineSegment tempSegment = new LineSegment();
Coordinate[] coords = line.getCoordinates();
for (int i = 0; i < coords.length - 1; i++) {
tempSegment.setCoordinates(coords[i], coords[i + 1]);
// this is somewhat inefficient - could do better
Coordinate closestPt = tempSegment.closestPoint(pt);
ptDist.setMinimum(closestPt, pt);
}
}
public static void computeDistance(Geometry geom, Coordinate pt, PointPairDistance ptDist) {
if (geom instanceof LineString) {
computeDistance((LineString) geom, pt, ptDist);
} else if (geom instanceof Polygon) {
computeDistance((Polygon) geom, pt, ptDist);
} else if (geom instanceof GeometryCollection) {
GeometryCollection gc = (GeometryCollection) geom;
for (int i = 0; i < gc.getNumGeometries(); i++) {
Geometry g = gc.getGeometryN(i);
computeDistance(g, pt, ptDist);
}
} else { // assume geom is Point
ptDist.setMinimum(geom.getCoordinate(), pt);
}
}
public static void computeDistance(LineSegment segment, Coordinate pt, PointPairDistance ptDist) {
Coordinate closestPt = segment.closestPoint(pt);
ptDist.setMinimum(closestPt, pt);
}