Choose camera controller

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Sample viewer app

Control the behavior of the camera in a scene.

screenshot

Use Case

The globe camera controller (the default camera controller in all new scenes) allows a user to explore the scene freely by zooming in/out and panning around the globe. The orbit camera controllers fix the camera to look at a target location or geoelement. A primary use case is for following moving objects like cars and planes.

How to use the sample

The application loads with the default globe camera controller. To rotate and fix the scene around the plane, exit globe mode by choosing the "Orbit camera around plane" option (i.e. camera will now be fixed to the plane). Choose the "Orbit camera around crater" option to rotate and center the scene around the location of the Upheaval Dome crater structure, or choose the "Free pan round the globe" option to return to default free navigation.

How it works

  1. Create an instance of a class extending CameraController: GlobeCameraController, OrbitLocationCameraController, OrbitGeoElementCameraController.
  2. Set the scene view's camera controller with sceneView.setCameraController(cameraController).

Relevant API

  • Scene
  • Camera
  • GlobeCameraController
  • OrbitGeoElementCameraController
  • OrbitLocationCameraController
  • SceneView

Tags

camera controller, Camera, SceneView, 3D

Sample Code

ChooseCameraController.cppChooseCameraController.cppChooseCameraController.hChooseCameraController.qml
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// [WriteFile Name=ChooseCameraController, Category=Scenes]
// [Legal]
// Copyright 2019 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 "ChooseCameraController.h"

#include "ArcGISTiledElevationSource.h"
#include "GlobeCameraController.h"
#include "ModelSceneSymbol.h"
#include "OrbitLocationCameraController.h"
#include "OrbitGeoElementCameraController.h"
#include "Scene.h"
#include "SceneQuickView.h"
#include "SimpleMarkerSceneSymbol.h"
#include "SimpleRenderer.h"

#include <QDir>
#include <QtCore/qglobal.h>

#ifdef Q_OS_IOS
#include <QStandardPaths>
#endif // Q_OS_IOS

namespace
{
  const double longitude = -109.929589;
  const double latitude = 38.43500;
  const double distance = 5000;

  QString defaultDataPath()
  {
    QString dataPath;

  #ifdef Q_OS_ANDROID
    dataPath = "/sdcard";
  #elif defined Q_OS_IOS
    dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
  #else
    dataPath = QDir::homePath();
  #endif

    return dataPath;
  }
}

using namespace Esri::ArcGISRuntime;

ChooseCameraController::ChooseCameraController(QObject* parent /* = nullptr */):
  QObject(parent),
  m_orbitGlobe(new GlobeCameraController(this)),
  m_orbitLocation(new OrbitLocationCameraController(Point(longitude, latitude, 0.0, SpatialReference::wgs84()), 100, this)),
  m_scene(new Scene(BasemapStyle::ArcGISImageryStandard, this))
{
  // create a new elevation source from Terrain3D REST service
  ArcGISTiledElevationSource* elevationSource = new ArcGISTiledElevationSource(
        QUrl("https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"), this);

  // add the elevation source to the scene to display elevation
  m_scene->baseSurface()->elevationSources()->append(elevationSource);

  m_orbitLocation->setCameraDistance(distance);

  // get the data path
  QUrl dataUrl(defaultDataPath() + "/ArcGIS/Runtime/Data/3D/Bristol/Collada/Bristol.dae");
  ModelSceneSymbol* planeModel = new ModelSceneSymbol(dataUrl, 10.0f, this);

  Esri::ArcGISRuntime::Graphic* graphic = new Graphic(Point(longitude, latitude, distance / 2), planeModel, this);

  m_overlay = new GraphicsOverlay(this);

  m_overlay->setSceneProperties(LayerSceneProperties(SurfacePlacement::Relative));
  m_overlay->graphics()->append(graphic);
  m_orbitGeoElement = new OrbitGeoElementCameraController(graphic, distance / 2, this);
}

ChooseCameraController::~ChooseCameraController() = default;

void ChooseCameraController::setGlobeController()
{
  if(m_sceneView != nullptr)
  {
    m_sceneView->setCameraController(m_orbitGlobe);
  }
}

void ChooseCameraController::setOrbitLocationController()
{
  if(m_sceneView != nullptr)
  {
    m_sceneView->setCameraController(m_orbitLocation);
  }
}

void ChooseCameraController::setOrbitGeoElementController()
{
  if(m_sceneView != nullptr)
  {
    m_sceneView->setCameraController(m_orbitGeoElement);
  }
}

void ChooseCameraController::init()
{
  // Register classes for QML
  qmlRegisterType<SceneQuickView>("Esri.Samples", 1, 0, "SceneView");
  qmlRegisterType<ChooseCameraController>("Esri.Samples", 1, 0, "ChooseCameraControllerSample");
}

SceneQuickView* ChooseCameraController::sceneView() const
{
  return m_sceneView;
}

// Set the view (created in QML)
void ChooseCameraController::setSceneView(SceneQuickView* sceneView)
{
  if (!sceneView || sceneView == m_sceneView)
  {
    return;
  }

  m_sceneView = sceneView;
  m_sceneView->setViewpointCamera(Camera(latitude, longitude, distance, 0.0, 0.0, 0.0));
  m_sceneView->setArcGISScene(m_scene);
  m_sceneView->graphicsOverlays()->append(m_overlay);

  emit sceneViewChanged();
}

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