Examples of com.vividsolutions.jts.operation.distance.DistanceOp

Package com.vividsolutions.jts.operation.distance

Examples of com.vividsolutions.jts.operation.distance.DistanceOp

com.vividsolutions.jts.operation.distance.DistanceOp
Find two points on two {@link Geometry}s which lie within a given distance, or else are the nearest points on the geometries (in which case this also provides the distance between the geometries).
The distance computation also finds a pair of points in the input geometries which have the minimum distance between them. If a point lies in the interior of a line segment, the coordinate computed is a close approximation to the exact point.
The algorithms used are straightforward O(n^2) comparisons. This worst-case performance could be improved on by using Voronoi techniques or spatial indexes. @version 1.7

    try {
      Geometry A = wktRdr.read(wktA);
      Geometry B = wktRdr.read(wktB);
      System.out.println("Geometry A: " + A);
      System.out.println("Geometry B: " + B);
      DistanceOp distOp = new DistanceOp(A, B);


      double distance = distOp.distance();
      System.out.println("Distance = " + distance);


      Coordinate[] closestPt = distOp.nearestPoints();
      LineString closestPtLine = fact.createLineString(closestPt);
      System.out.println("Closest points: " + closestPtLine
                         + " (distance = " + closestPtLine.getLength() + ")");
    }
    catch (Exception ex) {

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                double nearestDistance = 9e9;
                double nearestBearing = 0;
                for (Iterator sItr = featuresCheck.iterator(); sItr.hasNext();) {
                    Feature f = (Feature)sItr.next();
                    if (f.getDefaultGeometry() == null) continue;
                    DistanceOp op = new DistanceOp(request.getPoint(), f.getDefaultGeometry());
                    Coordinate[] co = op.closestPoints();
                    Measure m = DefaultGeographicCRS.WGS84.distance(new double[] { co[0].x, co[0].y, }, new double[] { co[1].x, co[1].y, });
                    if (m.doubleValue() > nearestDistance) continue;
                    nearestFeature = f;
                    nearestDistance = m.doubleValue();
                    nearestBearing = calcBearing(co);

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                featureIterator = featureCollection.features();
                while (featureIterator.hasNext()) {
                    SimpleFeature f = (SimpleFeature) featureIterator.next();
                    if (f.getDefaultGeometryProperty().getValue() == null)
                        continue;
                    DistanceOp op = new DistanceOp(point, (Geometry) f.getDefaultGeometryProperty()
                            .getValue());
                    Coordinate[] co = op.closestPoints();
                    double[] co0 = new double[] { co[0].x, co[0].y, };
                    double[] co1 = new double[] { co[1].x, co[1].y, };
                    double[] geo0 = new double[2];
                    double[] geo1 = new double[2];
                    crsTransform.transform(co0, 0, geo0, 0, 1);

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            try {
                while (featureIterator.hasNext()) {
                    SimpleFeature f = (SimpleFeature) featureIterator.next();
                    if (f.getDefaultGeometryProperty().getValue() == null)
                        continue;
                    DistanceOp op = new DistanceOp(point, (Geometry) f.getDefaultGeometryProperty()
                            .getValue());
                    Coordinate[] co = op.closestPoints();
                    double[] co0 = new double[] { co[0].x, co[0].y, };
                    double[] co1 = new double[] { co[1].x, co[1].y, };
                    double[] geo0 = new double[2];
                    double[] geo1 = new double[2];
                    crsTransform.transform(co0, 0, geo0, 0, 1);

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            try {
                while (featureIterator.hasNext()) {
                    SimpleFeature f = (SimpleFeature) featureIterator.next();
                    if (f.getDefaultGeometryProperty().getValue() == null)
                        continue;
                    DistanceOp op = new DistanceOp(point, (Geometry) f.getDefaultGeometryProperty()
                            .getValue());
                    Coordinate[] co = op.closestPoints();
                    double[] co0 = new double[] { co[0].x, co[0].y, };
                    double[] co1 = new double[] { co[1].x, co[1].y, };
                    double[] geo0 = new double[2];
                    double[] geo1 = new double[2];
                    crsTransform.transform(co0, 0, geo0, 0, 1);

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                featureIterator = featureCollection.iterator();
                while (featureIterator.hasNext()) {
                    SimpleFeature f = (SimpleFeature) featureIterator.next();
                    if (f.getDefaultGeometryProperty().getValue() == null)
                        continue;
                    DistanceOp op = new DistanceOp(point, (Geometry) f.getDefaultGeometryProperty()
                            .getValue());
                    Coordinate[] co = op.closestPoints();
                    double[] co0 = new double[] { co[0].x, co[0].y, };
                    double[] co1 = new double[] { co[1].x, co[1].y, };
                    double[] geo0 = new double[2];
                    double[] geo1 = new double[2];
                    crsTransform.transform(co0, 0, geo0, 0, 1);

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                featureIterator = featureCollection.iterator();
                while (featureIterator.hasNext()) {
                    SimpleFeature f = (SimpleFeature) featureIterator.next();
                    if (f.getDefaultGeometryProperty().getValue() == null)
                        continue;
                    DistanceOp op = new DistanceOp(point, (Geometry) f.getDefaultGeometryProperty()
                            .getValue());
                    Coordinate[] co = op.closestPoints();
                    double[] co0 = new double[] { co[0].x, co[0].y, };
                    double[] co1 = new double[] { co[1].x, co[1].y, };
                    double[] geo0 = new double[2];
                    double[] geo1 = new double[2];
                    crsTransform.transform(co0, 0, geo0, 0, 1);

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    @Test
    public void testDistance() throws ParseException {
        WKTReader wktRdr = new WKTReader();
        Geometry A = wktRdr.read("POINT(40.00 30.00 )");
        Geometry B = wktRdr.read("POINT(40.00 40.00 )");
        DistanceOp distOp = new DistanceOp(A, B);
        assertEquals(10.0, distOp.distance(), 0);
    }

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    doNearestPointsTest("POLYGON ((76 185, 125 283, 331 276, 324 122, 177 70, 184 155, 69 123, 76 185), (267 237, 148 248, 135 185, 223 189, 251 151, 286 183, 267 237))", "LINESTRING (120 215, 185 224, 209 207, 238 222, 254 186)", 0.0, new Coordinate(120, 215), new Coordinate(120, 215));
  }


  private void doNearestPointsTest(String wkt0, String wkt1, double distance, 
                                   Coordinate p0, Coordinate p1) throws ParseException {
    DistanceOp op = new DistanceOp(new WKTReader().read(wkt0), new WKTReader().read(wkt1));
    double tolerance = 1E-10;
    assertEquals(distance, op.nearestPoints()[0].distance(op.nearestPoints()[1]), tolerance);
    assertEquals(p0.x, op.nearestPoints()[0].x, tolerance);
    assertEquals(p0.y, op.nearestPoints()[0].y, tolerance);
    assertEquals(p1.x, op.nearestPoints()[1].x, tolerance);
    assertEquals(p1.y, op.nearestPoints()[1].y, tolerance);    
  }

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