Geometry engine simplify

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/*
 * Copyright 2017 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.geometry_engine_simplify;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
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.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.loadable.LoadStatus;
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 GeometryEngineSimplifySample extends Application {

  private ArcGISMap map; // keep loadable in scope to avoid garbage collection
  private GraphicsOverlay resultGeomOverlay;
  private Graphic polygon;
  private MapView mapView;

  // simple black line symbol
  private final SimpleLineSymbol line = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLACK, 1);

  @Override
  public void start(Stage stage) {

    try {
      // create stack pane and application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);
      scene.getStylesheets().add(getClass().getResource("/geometry_engine_simplify/style.css").toExternalForm());

      // set title, size, and add scene to stage
      stage.setTitle("Geometry Engine Simplify 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 control panel
      VBox controlsVBox = new VBox(6);
      controlsVBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0,0,0,0.3)"), CornerRadii.EMPTY,
          Insets.EMPTY)));
      controlsVBox.setPadding(new Insets(10.0));
      controlsVBox.setMaxSize(110, 80);
      controlsVBox.getStyleClass().add("panel-region");

      // create simplify button
      Button simplifyButton = new Button("Simplify");
      simplifyButton.setMaxWidth(Double.MAX_VALUE);
      simplifyButton.setDisable(true);

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

      // perform the simplify geometry operation
      simplifyButton.setOnAction(e -> {

        // check if the geometry needs to be simplified
        if (!GeometryEngine.isSimple(polygon.getGeometry())) {

          // simplify the geometry
          Geometry resultPolygon = GeometryEngine.simplify(polygon.getGeometry());

          // update result as a red graphic
          SimpleFillSymbol redSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.RED, line);
          resultGeomOverlay.getGraphics().add(new Graphic(resultPolygon, redSymbol));

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

      // clear result layer
      resetButton.setOnAction(e -> {
        resultGeomOverlay.getGraphics().clear();
        simplifyButton.setDisable(false);
        resetButton.setDisable(true);
      });

      // add buttons to the control panel
      controlsVBox.getChildren().addAll(simplifyButton, resetButton);

      // create a map with the light gray basemap style
      map = new ArcGISMap(BasemapStyle.ARCGIS_LIGHT_GRAY);

      // enable geometry operations when the map is done loading
      map.addDoneLoadingListener(() -> {
        if (map.getLoadStatus() == LoadStatus.LOADED) {
          simplifyButton.setDisable(false);
        } else {
          Alert alert = new Alert(Alert.AlertType.ERROR, "Map Failed to Load!");
          alert.show();
        }
      });

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

      // set a viewpoint on the map view, centered on London
      mapView.setViewpointCenterAsync(new Point(-13500, 6710327, SpatialReferences.getWebMercator()), 25000);

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

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

      // create sample polygon
      createPolygon();
      geomOverlay.getGraphics().add(polygon);

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

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

  /**
   * Creates the polygon.
   */
  private void createPolygon() {

    // part one
    PointCollection partSegmentCollectionOne = new PointCollection(SpatialReferences.getWebMercator());
    partSegmentCollectionOne.add(new Point(-13020, 6710130));
    partSegmentCollectionOne.add(new Point(-14160, 6710130));
    partSegmentCollectionOne.add(new Point(-14160, 6709300));
    partSegmentCollectionOne.add(new Point(-13020, 6709300));
    partSegmentCollectionOne.add(new Point(-13020, 6710130));
    Part partOne = new Part(partSegmentCollectionOne);

    // part two
    PointCollection partSegmentCollectionTwo = new PointCollection(SpatialReferences.getWebMercator());
    partSegmentCollectionTwo.add(new Point(-12160, 6710730));
    partSegmentCollectionTwo.add(new Point(-13160, 6710730));
    partSegmentCollectionTwo.add(new Point(-13160, 6709100));
    partSegmentCollectionTwo.add(new Point(-12160, 6709100));
    partSegmentCollectionTwo.add(new Point(-12160, 6710730));
    Part partTwo = new Part(partSegmentCollectionTwo);

    // part three
    PointCollection partSegmentCollectionThree = new PointCollection(SpatialReferences.getWebMercator());
    partSegmentCollectionThree.add(new Point(-12560, 6710030));
    partSegmentCollectionThree.add(new Point(-13520, 6710030));
    partSegmentCollectionThree.add(new Point(-13520, 6709000));
    partSegmentCollectionThree.add(new Point(-12560, 6709000));
    partSegmentCollectionThree.add(new Point(-12560, 6710030));
    Part partThree = new Part(partSegmentCollectionThree);

    PartCollection polygonParts = new PartCollection(partOne);
    polygonParts.add(partTwo);
    polygonParts.add(partThree);

    // transparent fill
    SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.TRANSPARENT, line);
    polygon = new Graphic(new Polygon(polygonParts), fillSymbol);

  }

  /**
   * 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);
  }
}