Extrude graphics

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// [WriteFile Name=ExtrudeGraphics, Category=Scenes]
// [Legal]
// Copyright 2016 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

// sample headers
#include "ExtrudeGraphics.h"

// ArcGIS Maps SDK headers
#include "ArcGISTiledElevationSource.h"
#include "AttributeListModel.h"
#include "Basemap.h"
#include "Camera.h"
#include "ElevationSourceListModel.h"
#include "Graphic.h"
#include "GraphicListModel.h"
#include "GraphicsOverlay.h"
#include "GraphicsOverlayListModel.h"
#include "MapTypes.h"
#include "Point.h"
#include "Polygon.h"
#include "PolygonBuilder.h"
#include "RendererSceneProperties.h"
#include "Scene.h"
#include "SceneQuickView.h"
#include "SceneViewTypes.h"
#include "SimpleFillSymbol.h"
#include "SimpleRenderer.h"
#include "SpatialReference.h"
#include "Surface.h"
#include "SymbolTypes.h"

// STL headers
#include <cmath>
#include <ctime>

using namespace Esri::ArcGISRuntime;

ExtrudeGraphics::ExtrudeGraphics(QQuickItem* parent) :
  QQuickItem(parent)
{
  srand(time(nullptr));
}

ExtrudeGraphics::~ExtrudeGraphics() = default;

void ExtrudeGraphics::init()
{
  qmlRegisterType<SceneQuickView>("Esri.Samples", 1, 0, "SceneView");
  qmlRegisterType<ExtrudeGraphics>("Esri.Samples", 1, 0, "ExtrudeGraphicsSample");
}

void ExtrudeGraphics::componentComplete()
{
  QQuickItem::componentComplete();

  // find QML SceneView component
  m_sceneView = findChild<SceneQuickView*>("sceneView");

  // create a new basemap instance
  Basemap* basemap = new Basemap(BasemapStyle::ArcGISImageryStandard, this);
  // create a new scene instance
  m_scene = new Scene(basemap, this);
  // set scene on the scene view
  m_sceneView->setArcGISScene(m_scene);

  // create a new elevation source
  ArcGISTiledElevationSource* elevationSource = new ArcGISTiledElevationSource(m_elevationSourceUrl, this);
  // add the elevation source to the scene to display elevation
  m_scene->baseSurface()->elevationSources()->append(elevationSource);

  // create a camera
  const double latitude = 28.4;
  const double longitude = 83.9;
  const double altitude = 10010.0;
  const double heading = 10.0;
  const double pitch = 80.0;
  const double roll = 0.0;
  Camera camera(latitude, longitude, altitude, heading, pitch, roll);
  // set the viewpoint
  m_sceneView->setViewpointCameraAndWait(camera);

  // graphics location
  double lon = camera.location().x() - 0.03;
  double lat = camera.location().y() + 0.2;

  GraphicsOverlay* graphicsOverlay = new GraphicsOverlay(this);

  // set renderer with extrusion property
  SimpleRenderer* renderer = new SimpleRenderer(this);
  RendererSceneProperties props = renderer->sceneProperties();
  props.setExtrusionMode(ExtrusionMode::BaseHeight);
  props.setExtrusionExpression("[height]");
  renderer->setSceneProperties(props);
  SimpleFillSymbol* sfs = new SimpleFillSymbol(SimpleFillSymbolStyle::Solid, QColor("red"), this);
  renderer->setSymbol(sfs);
  graphicsOverlay->setRenderer(renderer);

  // setup graphic locations
  QList<Point> pointsList;
  for (int i = 0; i <= 100; i++)
  {
    Point point(i / 10 * (m_size * 2) + lon, i % 10 * (m_size * 2) + lat, m_sceneView->spatialReference());
    pointsList.append(point);
  }

  for (const Point& point : pointsList)
  {
    // create a random z value
    const int randNum = rand() % 6 + 1;
    const double z = m_maxZ * randNum;

    // create a list of points
    const QList<Point> points { Point(point.x(), point.y(), z)
                              , Point(point.x() + m_size, point.y(), z)
                              , Point(point.x() + m_size, point.y() + m_size, z)
                              , Point(point.x(), point.y() + m_size, z)
                              };

    // create a new graphic
    Graphic* graphic = new Graphic(createPolygonFromPoints(points), this);
    // add a height attribute to the graphic using the attribute list model
    // the extrusion will be applied to this attribute. See the expression above
    graphic->attributes()->insertAttribute("height", z);
    // add the graphic to the graphic overlay
    graphicsOverlay->graphics()->append(graphic);
  }

  m_sceneView->graphicsOverlays()->append(graphicsOverlay);
}

// helper to create polygon from points
Polygon ExtrudeGraphics::createPolygonFromPoints(const QList<Point>& points)
{
  Polygon polygon;
  if (points.length() == 0)
    return polygon;

  // create a polygon builder
  PolygonBuilder* pb = new PolygonBuilder(m_sceneView->spatialReference(), this);
  for (const Point& point : points)
  {
    // add each point to the builder object
    pb->addPoint(point);
  }
  return polygon = pb->toPolygon();
}