text: // [WriteFile Name=FeatureLayerExtrusion, Category=Scenes]
  // [Legal]
  // 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.
  // [Legal]
  
  #ifdef PCH_BUILD
  #include "pch.hpp"
  #endif // PCH_BUILD
  
  #include "FeatureLayerExtrusion.h"
  
  #include "FeatureLayer.h"
  #include "ServiceFeatureTable.h"
  #include "ArcGISTiledElevationSource.h"
  #include "Scene.h"
  #include "SceneQuickView.h"
  #include "Point.h"
  #include "SimpleLineSymbol.h"
  #include "SimpleFillSymbol.h"
  #include "SimpleRenderer.h"
  #include "RendererSceneProperties.h"
  
  using namespace Esri::ArcGISRuntime;
  
  FeatureLayerExtrusion::FeatureLayerExtrusion(QQuickItem* parent /* = nullptr */):
    QQuickItem(parent),
    // define line and fill symbols for a simple renderer
    m_lineSymbol(new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("Black"), 1.0f, this)),
    m_fillSymbol(new SimpleFillSymbol(SimpleFillSymbolStyle::Solid, QColor("Blue"), m_lineSymbol, this)),
    m_renderer(new SimpleRenderer(m_fillSymbol, this))
  {
    // set renderer extrusion mode to absolute to prevent clipping
    RendererSceneProperties props = m_renderer->sceneProperties();
    props.setExtrusionMode(ExtrusionMode::AbsoluteHeight);
    props.setExtrusionExpression("[POP2007] / 10");
    m_renderer->setSceneProperties(props);
  }
  
  void FeatureLayerExtrusion::init()
  {
    // Register classes for QML
    qmlRegisterType<SceneQuickView>("Esri.Samples", 1, 0, "SceneView");
    qmlRegisterType<FeatureLayerExtrusion>("Esri.Samples", 1, 0, "FeatureLayerExtrusionSample");
  }
  
  void FeatureLayerExtrusion::componentComplete()
  {
    QQuickItem::componentComplete();
  
    // Create the feature service to use
    m_featureTable = new ServiceFeatureTable(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3"), this);
  
    // add the service feature table to a feature layer
    m_featureLayer = new FeatureLayer(m_featureTable, this);
  
    // set the feature layer to render dynamically to allow extrusion
    m_featureLayer->setRenderingMode(FeatureRenderingMode::Dynamic);
  
    // set the simple renderer to the feature layer
    m_featureLayer->setRenderer(m_renderer);
  
    // Create a scene and give it to the SceneView
    m_sceneView = findChild<SceneQuickView*>("sceneView");
    Scene* scene = new Scene(BasemapStyle::ArcGISImageryStandard, this);
    Surface* surface = new Surface(this);
    surface->elevationSources()->append(
          new ArcGISTiledElevationSource(
            QUrl("https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"),
            this));
    scene->setBaseSurface(surface);
    scene->operationalLayers()->append(m_featureLayer);
  
    // set initial viewpoint
    const double distance = 12940924;
    const Point lookAtPoint(-99.659448, 20.513652, distance, SpatialReference::wgs84());
    const Camera camera(lookAtPoint, 0, 15, 0);
    const Viewpoint initialVp(lookAtPoint, distance, camera);
    scene->setInitialViewpoint(initialVp);
  
    // apply initial extrusion
    totalPopulation();
  
    m_sceneView->setArcGISScene(scene);
  }
  
  void FeatureLayerExtrusion::popDensity()
  {
    // multiply population density by 5000 to make data legible
    RendererSceneProperties props = m_renderer->sceneProperties();
    props.setExtrusionExpression("([POP07_SQMI] * 5000) + 100000");
    m_renderer->setSceneProperties(props);
  }
  
  void FeatureLayerExtrusion::totalPopulation()
  {
    // divide total population by 10 to make data legible
    RendererSceneProperties props = m_renderer->sceneProperties();
    props.setExtrusionExpression("[POP2007] / 10");
    m_renderer->setSceneProperties(props);
  }
  
  
  
  