Densify and generalize

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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.densify_and_generalize;

import javafx.fxml.FXML;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Slider;
import javafx.scene.paint.Color;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.GeometryEngine;
import com.esri.arcgisruntime.geometry.Multipoint;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.PointCollection;
import com.esri.arcgisruntime.geometry.Polyline;
import com.esri.arcgisruntime.geometry.SpatialReference;
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.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;

public class DensifyAndGeneralizeController {

  @FXML private MapView mapView;
  @FXML private Slider maxSegmentLengthSlider;
  @FXML private Slider maxDeviationSlider;
  @FXML private CheckBox resultVisibilityCheckBox;
  @FXML private CheckBox densifyCheckBox;
  @FXML private CheckBox generalizeCheckBox;

  private Polyline originalPolyline;
  private Graphic resultPointsGraphic;
  private Graphic resultPolylineGraphic;

  @FXML
  public void initialize() {
    // 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 streets night basemap style
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_STREETS_NIGHT);

    // set the map to the map view
    mapView.setMap(map);

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

    // create some points along a river for the original geometry
    PointCollection points = createShipPoints();

    // show the original points as red dots on the map
    Multipoint originalMultipoint = new Multipoint(points);
    Graphic originalPointsGraphic = new Graphic(originalMultipoint, new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE,
      Color.RED, 7));
    graphicsOverlay.getGraphics().add(originalPointsGraphic);

    // show a dotted red line connecting the original points
    originalPolyline = new Polyline(points);
    Graphic originalPolylineGraphic = new Graphic(originalPolyline, new SimpleLineSymbol(SimpleLineSymbol.Style.DOT,
        Color.RED, 3));
    graphicsOverlay.getGraphics().add(originalPolylineGraphic);

    // show the result (densified and generalized) points as magenta dots on the map
    resultPointsGraphic = new Graphic();
    resultPointsGraphic.setSymbol(new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, Color.MAGENTA, 7));
    graphicsOverlay.getGraphics().add(resultPointsGraphic);

    // connect the result points with a magenta line
    resultPolylineGraphic = new Graphic();
    resultPolylineGraphic.setSymbol(new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.MAGENTA, 3));
    graphicsOverlay.getGraphics().add(resultPolylineGraphic);

    // update the densified/generalized parameters when the slider values change
    maxSegmentLengthSlider.valueProperty().addListener(o -> updateGeometry());
    maxDeviationSlider.valueProperty().addListener(o -> updateGeometry());

    // set initial values
    maxSegmentLengthSlider.setValue(100);
    maxDeviationSlider.setValue(10);

    // zoom to the original polyline
    mapView.setViewpointGeometryAsync(originalPolyline.getExtent(), 100);
  }

  /**
   * Called when any of the densify/generalize option values are changed. Applies the densify and generalize
   * operations to the original polyline and updates the result graphics with the result geometry.
   */
  @FXML
  private void updateGeometry() {
    Polyline polyline = originalPolyline;
    if (generalizeCheckBox.isSelected()) {
      polyline = (Polyline) GeometryEngine.generalize(polyline, maxDeviationSlider.getValue(), true);
    }
    if (densifyCheckBox.isSelected()) {
      polyline = (Polyline) GeometryEngine.densify(polyline, maxSegmentLengthSlider.getValue());
    }
    resultPolylineGraphic.setGeometry(polyline);
    Multipoint multipoint = new Multipoint(polyline.getParts().getPartsAsPoints());
    resultPointsGraphic.setGeometry(multipoint);
  }

  /**
   * Toggles the visibility of the result graphics depending on the state of the result visibility checkbox.
   */
  @FXML
  private void updateResultVisibility() {
    resultPolylineGraphic.setVisible(resultVisibilityCheckBox.isSelected());
    resultPointsGraphic.setVisible(resultVisibilityCheckBox.isSelected());
  }

  /**
   * Creates a collection of points along the Willamette River in Portland, OR.
   *
   * @return points
   */
  private PointCollection createShipPoints() {
    PointCollection points = new PointCollection(SpatialReference.create(32126));
    points.add(new Point(2330611.130549, 202360.002957, 0.000000));
    points.add(new Point(2330583.834672, 202525.984012, 0.000000));
    points.add(new Point(2330574.164902, 202691.488009, 0.000000));
    points.add(new Point(2330689.292623, 203170.045888, 0.000000));
    points.add(new Point(2330696.773344, 203317.495798, 0.000000));
    points.add(new Point(2330691.419723, 203380.917080, 0.000000));
    points.add(new Point(2330435.065296, 203816.662457, 0.000000));
    points.add(new Point(2330369.500800, 204329.861789, 0.000000));
    points.add(new Point(2330400.929891, 204712.129673, 0.000000));
    points.add(new Point(2330484.300447, 204927.797132, 0.000000));
    points.add(new Point(2330514.469919, 205000.792463, 0.000000));
    points.add(new Point(2330638.099138, 205271.601116, 0.000000));
    points.add(new Point(2330725.315888, 205631.231308, 0.000000));
    points.add(new Point(2330755.640702, 206433.354860, 0.000000));
    points.add(new Point(2330680.644719, 206660.240923, 0.000000));
    points.add(new Point(2330386.957926, 207340.947204, 0.000000));
    points.add(new Point(2330485.861737, 207742.298501, 0.000000));
    return points;
  }

  /**
   * Stops and releases all resources used in application.
   */
  void terminate() {

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

}