argeo/app/geo/GeoShapeUtils.java

   1 package org.argeo.app.geo;
   2
   3 import org.locationtech.jts.geom.Coordinate;
   4 import org.locationtech.jts.geom.Geometry;
   5 import org.locationtech.jts.geom.LineString;
   6 import org.locationtech.jts.geom.Point;
   7 import org.locationtech.jts.geom.Polygon;
   8
   9 /** Utilities around ODK's GeoShape format */
  10 public class GeoShapeUtils {
  11
  12         /** Converts a {@link Geometry} with WGS84 coordinates to a GeoShape. */
  13         public static String geometryToGeoShape(Geometry geometry) {
  14                 if (geometry instanceof Point point) {
  15                         Coordinate coordinate = point.getCoordinate();
  16                         StringBuilder sb = new StringBuilder();
  17                         appendToGeoShape(sb, coordinate.getX(), coordinate.getY(), coordinate.getZ());
  18                         return sb.toString();
  19                 } else if (geometry instanceof Polygon || geometry instanceof LineString) {
  20                         StringBuilder sb = new StringBuilder();
  21                         for (Coordinate coordinate : geometry.getCoordinates()) {
  22                                 appendToGeoShape(sb, coordinate.getX(), coordinate.getY(), coordinate.getZ());
  23                                 sb.append(';');
  24                         }
  25                         return sb.toString();
  26                 } else {
  27                         throw new IllegalArgumentException("Unsupported geometry " + geometry.getClass());
  28                 }
  29         }
  30
  31         public static String geoPointToGeoShape(double lon, double lat, double alt) {
  32                 StringBuilder sb = new StringBuilder();
  33                 appendToGeoShape(sb, lon, lat, alt);
  34                 return sb.toString();
  35         }
  36
  37         private static void appendToGeoShape(StringBuilder sb, double lon, double lat, double alt) {
  38                 sb.append(lat).append(' ');
  39                 sb.append(lon).append(' ');
  40                 if (alt != Double.NaN)
  41                         sb.append(alt).append(' ');
  42                 else
  43                         sb.append("0 ");
  44                 sb.append('0');
  45         }
  46
  47         /** singleton */
  48         private GeoShapeUtils() {
  49         }
  50
  51 }