use the GeometryEngine to perform some of the operations: Union, Difference, Intersection and Buffer in esri - Java Geographic Information System

Description

use the GeometryEngine to perform some of the operations: Union, Difference, Intersection and Buffer in esri

Demo Code

  /*/*from ww  w .  j  a  v  a2s . c o m*/
   * Copyright 2015 Esri.
   * 
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not
   * use this file except in compliance with the License. You may obtain a copy of
   * the License at
   * 
   * http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations under
   * the License.
   */

  package com.esri.sampleviewer.samples.geometry;

  import javafx.application.Application;
  import javafx.application.Platform;
  import javafx.collections.FXCollections;
  import javafx.geometry.Insets;
  import javafx.geometry.Pos;
  import javafx.scene.Scene;
  import javafx.scene.control.Button;
  import javafx.scene.control.ComboBox;
  import javafx.scene.control.Label;
  import javafx.scene.control.TextArea;
  import javafx.scene.layout.StackPane;
  import javafx.scene.layout.VBox;
  import javafx.stage.Stage;

  import com.esri.arcgisruntime.geometry.Geometry;
  import com.esri.arcgisruntime.geometry.GeometryEngine;
  import com.esri.arcgisruntime.geometry.Part;
  import com.esri.arcgisruntime.geometry.PartCollection;
  import com.esri.arcgisruntime.geometry.Point;
  import com.esri.arcgisruntime.geometry.PointCollection;
  import com.esri.arcgisruntime.geometry.Polygon;
  import com.esri.arcgisruntime.geometry.SpatialReferences;
  import com.esri.arcgisruntime.mapping.Basemap;
  import com.esri.arcgisruntime.mapping.Map;
  import com.esri.arcgisruntime.mapping.view.Graphic;
  import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
  import com.esri.arcgisruntime.mapping.view.MapView;
  import com.esri.arcgisruntime.symbology.RgbColor;
  import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
  import com.esri.arcgisruntime.symbology.SimpleLineSymbol;

  /**
   * This sample demonstrates how to use the {@link GeometryEngine} to perform
   * some of the operations: Union, Difference, Intersection and Buffer.
   * <h4>How it Works</h4>
   * 
   * First two {@link Graphic} polygons are created via {@link PointCollection}
   * and {@link PartCollection}. Next, the selected Geometry Engine operation is
   * performed and the {@link Geometry} result is displayed.
   */
  public class GeometryEngineSample extends Application {

      private MapView mapView;
      private GraphicsOverlay geomLayer;
      private GraphicsOverlay resultGeomLayer;
      private Graphic polygon1;
      private Graphic polygon2;

      // Geometry operations
      enum OPERATION_TYPE {
          UNION, DIFFERENCE, BUFFER, INTERSECTION
      }

      // UI 
      private RgbColor red = new RgbColor(233, 31, 31, 255);
      private RgbColor green = new RgbColor(0, 153, 0, 255);
      private RgbColor blue = new RgbColor(0, 0, 204, 255);
      private RgbColor black = new RgbColor(0, 0, 0, 255);
      private SimpleLineSymbol line = new SimpleLineSymbol(
              SimpleLineSymbol.Style.SOLID, black, 1, 1.0f);

      @Override
public void start(Stage stage) throws Exception {

  // create stack pane and application scene
  StackPane stackPane = new StackPane();
  Scene scene = new Scene(stackPane);
  scene.getStylesheets().add(getClass().getResource(
      "../resources/SamplesTheme.css").toExternalForm());

  // set title, size, and add scene to stage
  stage.setTitle("Geometry Engine Sample");
  stage.setWidth(800);
  stage.setHeight(700);
  stage.setScene(scene);
  stage.show();

  // create a control panel
  VBox vBoxControl = new VBox(6);
  vBoxControl.setMaxSize(210, 230);
  vBoxControl.getStyleClass().add("panel-region");

  // create sample description
  Label descriptionLabel = new Label("Sample Description:");
  descriptionLabel.getStyleClass().add("panel-label");
  TextArea description = new TextArea(
      "Select a geometry engine operation to perform on the two polygons");
  description.setWrapText(true);
  description.autosize();
  description.setEditable(false);

  // create section for combo box
  Label geomOperationLabel = new Label("Select geometry operation");
  geomOperationLabel.getStyleClass().add("panel-label");

  // initialise comboBox items
  ComboBox<OPERATION_TYPE> geomOperationBox = new ComboBox<>(FXCollections
      .observableArrayList(OPERATION_TYPE.values()));
  geomOperationBox.getSelectionModel().selectLast();
  geomOperationBox.setMaxWidth(Double.MAX_VALUE);
  geomOperationBox.setDisable(true);

  // create button for reset the sample
  Button resetButton = new Button("Reset operation");
  resetButton.setMaxWidth(Double.MAX_VALUE);
  resetButton.setDisable(true);

  // handle ComboBox event to perform the selected geometry operation
  geomOperationBox.setOnAction(e -> {
    Geometry resultPolygon;
    if (geomOperationBox.getSelectionModel().getSelectedItem().equals(
        OPERATION_TYPE.UNION)) {
      resultPolygon = GeometryEngine.union(polygon1.getGeometry(), polygon2
          .getGeometry());
    } else if (geomOperationBox.getSelectionModel().getSelectedItem().equals(
        OPERATION_TYPE.DIFFERENCE)) {
      resultPolygon = GeometryEngine.difference(polygon1.getGeometry(),
          polygon2.getGeometry());
    } else if (geomOperationBox.getSelectionModel().getSelectedItem().equals(
        OPERATION_TYPE.BUFFER)) {
      resultPolygon = GeometryEngine.buffer(polygon2.getGeometry(), 50);
    } else {
      resultPolygon = GeometryEngine.intersection(polygon1.getGeometry(),
          polygon2.getGeometry());
    }

    // update result as a red geometry 
    SimpleFillSymbol redSymbol = new SimpleFillSymbol(red,
        SimpleFillSymbol.Style.SOLID, line, 1.0f);
    resultGeomLayer.getGraphics().add(new Graphic(resultPolygon, redSymbol));

    resetButton.setDisable(false);
    geomOperationBox.setDisable(true);
  });

  // clear result layer
  resetButton.setOnAction(e -> {
    resultGeomLayer.getGraphics().clear();
    geomOperationBox.setDisable(false);
  });

  // add label, sample description, and buttons to the control panel
  vBoxControl.getChildren().addAll(descriptionLabel, description,
      geomOperationLabel, geomOperationBox, resetButton);

  try {

    // create map with topograohic basemap
    Map map = new Map(Basemap.createLightGrayCanvas());

    // enable geometry operations when map is done loading
    map.addDoneLoadingListener(() -> {
      geomOperationBox.setDisable(false);
    });

    mapView = new MapView();
    mapView.setMap(map);

    // set the map views's viewpoint centred on London and scaled
    Point viewPoint = new Point(-14153, 6710527, SpatialReferences
        .getWebMercator());
    mapView.setViewpointCenterWithScaleAsync(viewPoint, 30000);

    // create geometry layers
    geomLayer = new GraphicsOverlay();
    mapView.getGraphicsOverlays().add(geomLayer);

    resultGeomLayer = new GraphicsOverlay();
    mapView.getGraphicsOverlays().add(resultGeomLayer);

    // create sample polygons
    createPolygons();

    geomLayer.getGraphics().add(polygon1);
    geomLayer.getGraphics().add(polygon2);

    // add the map view and control panel to stack pane
    stackPane.getChildren().addAll(mapView, vBoxControl);
    StackPane.setAlignment(vBoxControl, Pos.TOP_LEFT);
    StackPane.setMargin(vBoxControl, new Insets(10, 0, 0, 10));

  } catch (Exception e) {
    // on any error, display the stack trace
    e.printStackTrace();
  }
}

      /**
       * Creates the two intersecting polygons used in the application.
       * 
       */
      private void createPolygons() {

          // create blue polygon 
          PointCollection pointsPoly = new PointCollection(
                  SpatialReferences.getWebMercator());
          pointsPoly.add(new Point(-13160, 6710100));
          pointsPoly.add(new Point(-13300, 6710500));
          pointsPoly.add(new Point(-13760, 6710730));
          pointsPoly.add(new Point(-14660, 6710000));
          pointsPoly.add(new Point(-13960, 6709400));

          SimpleFillSymbol fillSymbol = new SimpleFillSymbol(blue,
                  SimpleFillSymbol.Style.SOLID, line, 1.0f);
          Polygon polygonSymbol = new Polygon(pointsPoly);
          polygon1 = new Graphic(polygonSymbol, fillSymbol);

          // create green polygon 
          // outer ring
          PointCollection outerRingSegmentCollection = new PointCollection(
                  SpatialReferences.getWebMercator());
          outerRingSegmentCollection.add(new Point(-13060, 6711030));
          outerRingSegmentCollection.add(new Point(-12160, 6710730));
          outerRingSegmentCollection.add(new Point(-13160, 6709700));
          outerRingSegmentCollection.add(new Point(-14560, 6710730));
          outerRingSegmentCollection.add(new Point(-13060, 6711030));
          Part outerRing = new Part(outerRingSegmentCollection);

          // inner ring
          PointCollection innerRingSegmentCollection = new PointCollection(
                  SpatialReferences.getWebMercator());
          innerRingSegmentCollection.add(new Point(-13060, 6710910));
          innerRingSegmentCollection.add(new Point(-12450, 6710660));
          innerRingSegmentCollection.add(new Point(-13160, 6709900));
          innerRingSegmentCollection.add(new Point(-14160, 6710630));
          innerRingSegmentCollection.add(new Point(-13060, 6710910));
          Part innerRing = new Part(innerRingSegmentCollection);

          PartCollection polygonParts = new PartCollection(outerRing);
          polygonParts.add(innerRing);
          fillSymbol = new SimpleFillSymbol(green,
                  SimpleFillSymbol.Style.SOLID, line, 1.0f);
          polygon2 = new Graphic(new Polygon(polygonParts), fillSymbol);
      }

      /**
       * Stops and releases all resources used in application.
       *
       * @throws Exception if security manager doesn't allow JVM to exit with
       *           current status
       */
      @Override
      public void stop() throws Exception {

          if (mapView != null) {
              mapView.dispose();
          }
          Platform.exit();
          System.exit(0);
      }

      /**
       * Opens and runs application.
       *
       * @param args arguments passed to this application
       */
      public static void main(String[] args) {

          Application.launch(args);
      }
  }

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