Cut geometry

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Sample viewer app

Cut a geometry along a polyline.

Image of cut geometry

Use case

You might cut a polygon representing a large parcel to subdivide it into smaller parcels.

How to use the sample

Click the "Cut" button to cut the polygon with the polyline and see the resulting parts (shaded in different colors).

How it works

  1. Pass the geometry and polyline to GeometryEngine.cut to cut the geometry along the polyline.
  2. Loop through the returned list of part geometries. Some of these geometries may be multi-part.

Relevant API

  • GeometryEngine
  • Polygon
  • Polyline

Tags

cut, geometry, split

Sample Code

CutGeometrySample.java
                                                                                                                                                                                                    
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/*
 * Copyright 2018 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.samples.cut_geometry;

import java.util.Arrays;
import java.util.List;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Geometry;
import com.esri.arcgisruntime.geometry.GeometryEngine;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.PointCollection;
import com.esri.arcgisruntime.geometry.Polygon;
import com.esri.arcgisruntime.geometry.Polyline;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
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.SimpleFillSymbol;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;

public class CutGeometrySample extends Application {

  private MapView mapView;

  @Override
  public void start(Stage stage) {

    try {
      // create stack pane and application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);

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

      // authentication with an API key or named user is required to access basemaps and other location services
      String yourAPIKey = System.getProperty("apiKey");
      ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);

      // create a map with the topographic basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);

      // create a map view and set the map to it
      mapView = new MapView();
      mapView.setMap(map);

      // create a graphics overlay
      GraphicsOverlay graphicsOverlay = new GraphicsOverlay();
      mapView.getGraphicsOverlays().add(graphicsOverlay);

      // create a blue polygon graphic to cut
      Graphic polygonGraphic = new Graphic(createLakeSuperiorPolygon(), new SimpleFillSymbol(SimpleFillSymbol.Style
          .SOLID, 0x220000FF, new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFF0000FF, 2)));
      graphicsOverlay.getGraphics().add(polygonGraphic);

      // create a red polyline graphic to cut the polygon
      Graphic polylineGraphic = new Graphic(createBorder(), new SimpleLineSymbol(SimpleLineSymbol.Style.DOT,
          0xFFFF0000, 3));
      graphicsOverlay.getGraphics().add(polylineGraphic);

      // zoom to show the polygon graphic
      mapView.setViewpointGeometryAsync(polygonGraphic.getGeometry());

      // create a button to perform the cut operation
      Button cutButton = new Button("Cut");
      cutButton.setOnAction(e -> {
        // cut the polygon geometry with the polyline, expect two geometries
        List<Geometry> parts = GeometryEngine.cut(polygonGraphic.getGeometry(), (Polyline) polylineGraphic.getGeometry());
        // create graphics for the US and Canada sides
        Graphic canadaSide = new Graphic(parts.get(0), new SimpleFillSymbol(SimpleFillSymbol.Style.FORWARD_DIAGONAL,
            0xFF00FF00, new SimpleLineSymbol(SimpleLineSymbol.Style.NULL, 0xFFFFFFFF, 0)));
        Graphic usSide = new Graphic(parts.get(1), new SimpleFillSymbol(SimpleFillSymbol.Style.FORWARD_DIAGONAL,
            0xFFFFFF00, new SimpleLineSymbol(SimpleLineSymbol.Style.NULL, 0xFFFFFFFF, 0)));
        graphicsOverlay.getGraphics().addAll(Arrays.asList(canadaSide, usSide));
        // only cut once
        cutButton.setDisable(true);
      });

      // add the map view to the stack pane
      stackPane.getChildren().addAll(mapView, cutButton);
      StackPane.setAlignment(cutButton, Pos.TOP_LEFT);
      StackPane.setMargin(cutButton, new Insets(10, 0, 0, 10));
    } catch (Exception e) {
      // on any error, display the stack trace.
      e.printStackTrace();
    }
  }

  /**
   * Creates a polyline along the US/Canada border over Lake Superior.
   *
   * @return polyline
   */
  private Polyline createBorder() {
    PointCollection points = new PointCollection(SpatialReferences.getWebMercator());
    points.add(new Point(-9981328.687124, 6111053.281447));
    points.add(new Point(-9946518.044066, 6102350.620682));
    points.add(new Point(-9872545.427566, 6152390.920079));
    points.add(new Point(-9838822.617103, 6157830.083057));
    points.add(new Point(-9446115.050097, 5927209.572793));
    points.add(new Point(-9430885.393759, 5876081.440801));
    points.add(new Point(-9415655.737420, 5860851.784463));
    return new Polyline(points);
  }

  /**
   * Creates a polygon of points around Lake Superior.
   *
   * @return polygon
   */
  private Polygon createLakeSuperiorPolygon() {
    PointCollection points = new PointCollection(SpatialReferences.getWebMercator());
    points.add(new Point(-10254374.668616, 5908345.076380));
    points.add(new Point(-10178382.525314, 5971402.386779));
    points.add(new Point(-10118558.923141, 6034459.697178));
    points.add(new Point(-9993252.729399, 6093474.872295));
    points.add(new Point(-9882498.222673, 6209888.368416));
    points.add(new Point(-9821057.766387, 6274562.532928));
    points.add(new Point(-9690092.583250, 6241417.023616));
    points.add(new Point(-9605207.742329, 6206654.660191));
    points.add(new Point(-9564786.389509, 6108834.986367));
    points.add(new Point(-9449989.747500, 6095091.726408));
    points.add(new Point(-9462116.153346, 6044160.821855));
    points.add(new Point(-9417652.665244, 5985145.646738));
    points.add(new Point(-9438671.768711, 5946341.148031));
    points.add(new Point(-9398250.415891, 5922088.336339));
    points.add(new Point(-9419269.519357, 5855797.317714));
    points.add(new Point(-9467775.142741, 5858222.598884));
    points.add(new Point(-9462924.580403, 5902686.086985));
    points.add(new Point(-9598740.325877, 5884092.264688));
    points.add(new Point(-9643203.813979, 5845287.765981));
    points.add(new Point(-9739406.633691, 5879241.702350));
    points.add(new Point(-9783061.694736, 5922896.763395));
    points.add(new Point(-9844502.151022, 5936640.023354));
    points.add(new Point(-9773360.570059, 6019099.583107));
    points.add(new Point(-9883306.649729, 5968977.105610));
    points.add(new Point(-9957681.938918, 5912387.211662));
    points.add(new Point(-10055501.612742, 5871965.858842));
    points.add(new Point(-10116942.069028, 5884092.264688));
    points.add(new Point(-10111283.079633, 5933406.315128));
    points.add(new Point(-10214761.742852, 5888134.399970));
    points.add(new Point(-10254374.668616, 5901877.659929));
    return new Polygon(points);
  }

  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {

    if (mapView != null) {
      mapView.dispose();
    }
  }

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

    Application.launch(args);
  }

}

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