Java Geometry.getCentroid方法代碼示例

import com.vividsolutions.jts.geom.Geometry; //導入方法依賴的package包/類
private static Geometry clusterizeGeometry(final Geometry geometry,
      final double distance_ratio)
{
   if (geometry == null)
   {
      return null;
   }

   int number_geometries = geometry.getNumGeometries();

   if (number_geometries > 1)
   {
      Geometry [] clustered_geometries =
         new Geometry [number_geometries];

      for (int igeom=0; igeom<number_geometries-1; igeom++)
      {
         Geometry current_geometry = geometry.getGeometryN(igeom);
         Point current_centroid = current_geometry.getCentroid();

         if ((current_geometry == null) ||
             (current_centroid == null))
         {
            // TODO Warning
            continue;
         }

         ArrayList<Geometry> current_cluster = new ArrayList<Geometry>();

         current_cluster.add(current_geometry);

         for (int jgeom=igeom+1; jgeom<number_geometries; jgeom++)
         {
            Geometry next_geometry = geometry.getGeometryN(jgeom);
            Point next_centroid = next_geometry.getCentroid();

            if ((next_geometry == null) ||
                (next_centroid == null))
            {
               // TODO Warning
               continue;
            }

            double distance = current_geometry.distance(next_geometry);
            double centroids_distance =
               current_centroid.distance(next_centroid);

            if (distance < (centroids_distance * distance_ratio))
            {
               current_cluster.add(next_geometry);
            }
         }

         Geometry [] current_cluster_array =
               new Geometry [current_cluster.size()];

         clustered_geometries[igeom] =
            geometry.getFactory().createGeometryCollection(
               current_cluster.toArray(current_cluster_array));
      }

      clustered_geometries[number_geometries-1] =
         geometry.getGeometryN(number_geometries-1);

      return convexHullOneLevel(
         geometry.getFactory().createGeometryCollection(
            clustered_geometries)).union();
   }
   else
   {
      return geometry;
   }
}
 

import com.vividsolutions.jts.geom.Geometry; //導入方法依賴的package包/類
@Override
		public void geometry(Geometry arg0) {
			
			if (arg0 == null || arg0.getArea() < 80)
				return;
			
			// TODO Auto-generated method stub
			if (count != 0) {
				System.out.println(arg0.getGeometryType());
		
				try {
					
					Point cen = arg0.getCentroid();
					Coordinate latLong = new Coordinate();
					
					JTS.transform(cen.getCoordinate(), latLong, transform);
					
					System.out.println(" ************************* " + count + " " + featureName);
					System.out.println("in EPSG:27700 " + cen);
					System.out.println("lat long " + latLong);

					URL url = new URL("https://maps.googleapis.com/maps/api/staticmap?center="+latLong.x+","+latLong.y+"&zoom=20&size=640x640&maptype=satellite&format=png32&key=AIzaSyDYAQH5nMlF0vEfdIg0seTiGUIcRbLNeI4");
					URLConnection connection = url.openConnection();
					InputStream is = connection.getInputStream();
//					
					BufferedImage image = ImageIO.read(is);// new BufferedImage( 640,640, BufferedImage.TYPE_3BYTE_BGR );
//					BufferedImage image = new BufferedImage( 640,640, BufferedImage.TYPE_3BYTE_BGR );
					Graphics2D g2 = (Graphics2D) image.getGraphics();
					g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
					
					double scale = 11f;

					int imageCenX = image.getWidth () >> 1,
						imageCenY = image.getHeight() >> 1;
					
							
					g2.setColor(Color.red);
					g2.setStroke(new BasicStroke(2f));
					
					for (Pair<Coordinate, Coordinate> pair : new ConsecutivePairs<Coordinate>( Arrays.asList( arg0.getCoordinates() ), true)) {
						
						double 
							x1 = pair.first().x - cen.getCoordinate().x, 
							y1 = pair.first().y - cen.getCoordinate().y,
							x2 = pair.second().x - cen.getCoordinate().x, 
							y2 = pair.second().y - cen.getCoordinate().y;

						x1 *= scale; x2 *= scale; y1 *= scale; y2 *= scale;
							
						g2.draw( new Line2D.Double(x1 + imageCenX, - y1 + imageCenY, x2 + imageCenX, - y2 +imageCenY) );
						
					}
					
					
					g2.drawString( HeightsToRedis.getHeight(featureName) +"m below roof", 5, 15 );
					g2.drawString( HeightsToRedis.getRoof(featureName) +"m including roof", 5, 30 );
					g2.drawString( latLong.x + ", " + latLong.y + " location ", 5, 45 );
					
					
					g2.dispose();
					
					
					
					ImageIO.write(image, "png", new FileOutputStream ( String.format( "/home/twak/data/footprints/center%04d.png", count )) );
					
					is.close();
					
					if (count > 1000)
						System.exit(0);
					
					
				} catch (Throwable e) {
					e.printStackTrace();
					System.exit(0);
				}
			}
			count++;
			featureName = "?";
		}