Viewshed Camera

A viewshed shows the visible and obstructed areas from an observer's vantage point. This sample demonstrates how to create and update a viewshed from a camera.

The sample will start with a viewshed created from the initial camera location, so only the visible (green) portion of the viewshed will be visible. Move around the scene to see the obstructed (red) portion. Click the Update from Camera button to update the viewshed to the current camera position

How it works

To create and update a viewshed from a camera:

  1. Get a Camera either by creating it, or by getting the current camera from the scene with sceneView.getCurrentViewpointCamera().
  2. Create a LocationViewshed passing in the Camera plus a min/max distance.
  3. To update the viewshed with a new camera, use viewshed.updateFromCamera(camera)

Code

/*
 * 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.analysis.viewshed_camera;

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.geoanalysis.LocationViewshed;
import com.esri.arcgisruntime.layers.ArcGISSceneLayer;
import com.esri.arcgisruntime.mapping.ArcGISScene;
import com.esri.arcgisruntime.mapping.ArcGISTiledElevationSource;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.Surface;
import com.esri.arcgisruntime.mapping.view.AnalysisOverlay;
import com.esri.arcgisruntime.mapping.view.Camera;
import com.esri.arcgisruntime.mapping.view.SceneView;

public class ViewshedCameraSample extends Application {

  private SceneView sceneView;

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

    try {

      // create stack pane and JavaFX app scene
      StackPane stackPane = new StackPane();
      Scene fxScene = new Scene(stackPane);

      // set title, size, and add JavaFX scene to stage
      stage.setTitle("Viewshed Camera Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(fxScene);
      stage.show();

      // create a scene and add a basemap to it
      ArcGISScene scene = new ArcGISScene();
      scene.setBasemap(Basemap.createImagery());

      // add the SceneView to the stack pane
      sceneView = new SceneView();
      sceneView.setArcGISScene(scene);

      // set the camera
      Camera camera = new Camera(48.3808, -4.49492, 48.2511, 344.488, 74.1212, 0.0);
      sceneView.setViewpointCamera(camera);

      // add base surface for elevation data
      Surface surface = new Surface();
      final String localElevationImageService = "http://scene.arcgis" +
          ".com/arcgis/rest/services/BREST_DTM_1M/ImageServer";
      surface.getElevationSources().add(new ArcGISTiledElevationSource(localElevationImageService));
      scene.setBaseSurface(surface);

      // add a scene layer
      final String buildings = "http://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/Buildings_Brest/SceneServer/layers/0";
      ArcGISSceneLayer sceneLayer = new ArcGISSceneLayer(buildings);
      scene.getOperationalLayers().add(sceneLayer);

      // create a viewshed from the camera
      LocationViewshed viewshed = new LocationViewshed(camera, 1.0, 500.0);
      viewshed.setFrustumOutlineVisible(true);

      // create an analysis overlay to add the viewshed to the scene view
      AnalysisOverlay analysisOverlay = new AnalysisOverlay();
      analysisOverlay.getAnalyses().add(viewshed);
      sceneView.getAnalysisOverlays().add(analysisOverlay);

      // create a button to update the viewshed with the current camera
      Button cameraButton = new Button("Update from camera");
      cameraButton.setOnMouseClicked(e -> viewshed.updateFromCamera(sceneView.getCurrentViewpointCamera()));

      // add the sceneview and button to the stackpane
      stackPane.getChildren().addAll(sceneView, cameraButton);
      StackPane.setAlignment(cameraButton, Pos.TOP_LEFT);
      StackPane.setMargin(cameraButton, new Insets(10, 0, 0, 10));

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

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

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

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

    Application.launch(args);
  }

}


In this topic
  1. How it works
  2. Code