Distance composite symbol

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Sample viewer app

Change a graphic's symbol based on the camera's proximity to it.

screenshot

Use case

When showing dense datasets, it is beneficial to reduce the detail of individual points when zooming out to avoid visual clutter and to avoid data points overlapping and obscuring each other.

How to use the sample

The sample starts looking at a plane. Zoom out from the plane to see it turn into a cone. Keeping zooming out and it will turn into a point.

How it works

  1. Create a GraphicsOverlay object and add it to a SceneView object.
  2. Create a DistanceCompositeSceneSymbol object.
  3. Create DistanceSymbolRange objects specifying a Symbol and the min and max distance within which the symbol should be visible.
  4. Add the ranges to the range collection of the distance composite scene symbol.
  5. Create a Graphic object with the distance composite scene symbol at a location and add it to the graphics overlay.

Relevant API

  • DistanceCompositeSceneSymbol
  • Range
  • RangeCollection

Offline Data

Read more about how to set up the sample's offline data here.

Link Local Location
Model Marker Symbol Data <userhome>/ArcGIS/Runtime/Data/3D/Bristol/Collada/Bristol.dae

Tags

3D, data, graphic

Sample Code

DistanceCompositeSymbol.cppDistanceCompositeSymbol.cppDistanceCompositeSymbol.hDistanceCompositeSymbol.qml
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// [WriteFile Name=DistanceCompositeSymbol, 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

#include "DistanceCompositeSymbol.h"

#include "Scene.h"
#include "SceneQuickView.h"
#include "Basemap.h"
#include "ArcGISTiledElevationSource.h"
#include "DistanceCompositeSceneSymbol.h"
#include "SimpleMarkerSymbol.h"
#include "SimpleMarkerSceneSymbol.h"
#include "ModelSceneSymbol.h"
#include "OrbitGeoElementCameraController.h"

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

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

using namespace Esri::ArcGISRuntime;

// helper method to get cross platform data path
namespace
{
  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;
  }
} // namespace

DistanceCompositeSymbol::DistanceCompositeSymbol(QQuickItem* parent) :
  QQuickItem(parent)
{
}

DistanceCompositeSymbol::~DistanceCompositeSymbol() = default;

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

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

  // get the data path
  const QString dataPath = defaultDataPath() + "/ArcGIS/Runtime/Data/3D/Bristol/Collada/Bristol.dae";

  // 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(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);

  // create a camera
  const Point point(-2.708471, 56.096575, 5000, m_sceneView->spatialReference());

  // create a new graphics overlay and add it to the sceneview
  GraphicsOverlay* graphicsOverlay = new GraphicsOverlay(this);
  graphicsOverlay->setSceneProperties(LayerSceneProperties(SurfacePlacement::Relative));
  m_sceneView->graphicsOverlays()->append(graphicsOverlay);

  //! [create model scene symbol]
  constexpr float scale = 5.0f;
  ModelSceneSymbol* mms = new ModelSceneSymbol(QUrl(dataPath), scale, this);
  mms->setHeading(180);
  //! [create model scene symbol]

  connect(mms, &ModelSceneSymbol::loadStatusChanged, this, [mms, point, graphicsOverlay, this](){
    if (mms->loadStatus() == LoadStatus::Loaded)
    {
      SimpleMarkerSymbol* sms = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Circle, QColor("red"), 10.0f, this);
      //! [create simple marker scene symbol]
      const SimpleMarkerSceneSymbolStyle style = SimpleMarkerSceneSymbolStyle::Cone;
      const QColor color("red");
      constexpr double height = 75.0;
      constexpr double width = 75.0;
      constexpr double depth = 75.0;
      const SceneSymbolAnchorPosition anchorPosition = SceneSymbolAnchorPosition::Bottom;
      SimpleMarkerSceneSymbol* smss = new SimpleMarkerSceneSymbol(style, color, height, width, depth, anchorPosition, this);
      //! [create simple marker scene symbol]

      //! [create distance symbol ranges with each symbol type and a distance range(meters)]
      DistanceSymbolRange* dsrModel = new DistanceSymbolRange(mms, 0, 999, this); // ModelSceneSymbol
      DistanceSymbolRange* dsrCone = new DistanceSymbolRange(smss, 1000, 1999, this); // SimpleMarkerSceneSymbol
      DistanceSymbolRange* dsrCircle = new DistanceSymbolRange(sms, 2000, 0, this); // SimpleMarkerSymbol

      DistanceCompositeSceneSymbol* compositeSceneSymbol = new DistanceCompositeSceneSymbol(this);

      compositeSceneSymbol->ranges()->append(dsrModel);
      compositeSceneSymbol->ranges()->append(dsrCone);
      compositeSceneSymbol->ranges()->append(dsrCircle);
      //! [create distance symbol ranges with each symbol type and a distance range(meters)]

      // create a graphic using the composite symbol
      Graphic* graphic = new Graphic(point, compositeSceneSymbol, this);

      // add the graphic to the graphics overlay
      graphicsOverlay->graphics()->append(graphic);

      // add an orbit camera controller to lock the camera to the graphic
      OrbitGeoElementCameraController* cameraController = new OrbitGeoElementCameraController(graphic, 200, this);
      cameraController->setCameraPitchOffset(80);
      cameraController->setCameraHeadingOffset(-30);
      m_sceneView->setCameraController(cameraController);
    }
  });

  mms->load();
}

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