Show labels on layer in 3D

// [WriteFile Name=ShowLabelsOnLayerIn3D, Category=Scenes]
// [Legal]
// Copyright 2021 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 "ShowLabelsOnLayerIn3D.h"

// ArcGIS Maps SDK headers
#include "ArcadeLabelExpression.h"
#include "Error.h"
#include "FeatureLayer.h"
#include "GroupLayer.h"
#include "LabelDefinition.h"
#include "LabelDefinitionListModel.h"
#include "LayerListModel.h"
#include "Scene.h"
#include "SceneQuickView.h"
#include "LabelingTypes.h"
#include "TextSymbol.h"

using namespace Esri::ArcGISRuntime;

ShowLabelsOnLayerIn3D::ShowLabelsOnLayerIn3D(QObject* parent /* = nullptr */) :
  QObject(parent),
  m_scene(new Scene(QUrl("https://www.arcgis.com/home/item.html?id=850dfee7d30f4d9da0ebca34a533c169"), this))
{
  connect(m_scene, &Scene::doneLoading, this, [this]()
  {
    for (Layer* layer : *m_scene->operationalLayers())
    {
      if (layer->name() == "Gas")
      {
        // The gas layer is a GroupLayer type consisting of Layer types.
        // Labels can only be displayed on FeatureLayer types, so we must first convert it to a FeatureLayer class.
        GroupLayer* gasGroupLayer = dynamic_cast<GroupLayer*>(layer);
        if (!gasGroupLayer)
        {
          continue;
        }

        FeatureLayer* gasFeatureLayer = dynamic_cast<FeatureLayer*>(gasGroupLayer->layers()->first());
        if (gasFeatureLayer)
        {
          display3DLabelsOnFeatureLayer(gasFeatureLayer);
        }

        break;
      }
    }
  });
}

void ShowLabelsOnLayerIn3D::display3DLabelsOnFeatureLayer(FeatureLayer* featureLayer)
{
  TextSymbol* textSymbol = new TextSymbol(this);
  textSymbol->setColor(QColor("#ffa500"));
  textSymbol->setHaloColor(QColor(Qt::white));
  textSymbol->setHaloWidth(2.0);
  textSymbol->setSize(14.0);

  ArcadeLabelExpression* labelExpression = new ArcadeLabelExpression("Text($feature.INSTALLATIONDATE, 'D MMM Y')", this);
  LabelDefinition* labelDefinition = new LabelDefinition(labelExpression, textSymbol, this);
  labelDefinition->setPlacement(LabelingPlacement::LineAboveAlong);
  labelDefinition->setUseCodedValues(true);

  featureLayer->labelDefinitions()->clear();
  featureLayer->labelDefinitions()->append(labelDefinition);
  featureLayer->setLabelsEnabled(true);
}

ShowLabelsOnLayerIn3D::~ShowLabelsOnLayerIn3D() = default;

void ShowLabelsOnLayerIn3D::init()
{
  // Register classes for QML
  qmlRegisterType<SceneQuickView>("Esri.Samples", 1, 0, "SceneView");
  qmlRegisterType<ShowLabelsOnLayerIn3D>("Esri.Samples", 1, 0, "ShowLabelsOnLayerIn3DSample");
}

SceneQuickView* ShowLabelsOnLayerIn3D::sceneView() const
{
  return m_sceneView;
}

// Set the view (created in QML)
void ShowLabelsOnLayerIn3D::setSceneView(SceneQuickView* sceneView)
{
  if (!sceneView || sceneView == m_sceneView)
  {
    return;
  }

  m_sceneView = sceneView;
  m_sceneView->setArcGISScene(m_scene);

  emit sceneViewChanged();
}

// [WriteFile Name=ShowLabelsOnLayerIn3D, Category=Scenes]
// [Legal]
// Copyright 2021 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]

#ifndef SHOWLABELSONLAYERIN3D_H
#define SHOWLABELSONLAYERIN3D_H

// Qt headers
#include <QObject>

namespace Esri::ArcGISRuntime
{
  class Scene;
  class SceneQuickView;
  class FeatureLayer;
} // namespace Esri::ArcGISRuntime

Q_MOC_INCLUDE("SceneQuickView.h")

class ShowLabelsOnLayerIn3D : public QObject
{
  Q_OBJECT

  Q_PROPERTY(Esri::ArcGISRuntime::SceneQuickView* sceneView READ sceneView WRITE setSceneView NOTIFY sceneViewChanged)

public:
  explicit ShowLabelsOnLayerIn3D(QObject* parent = nullptr);
  ~ShowLabelsOnLayerIn3D();

  static void init();

signals:
  void sceneViewChanged();

private:
  Esri::ArcGISRuntime::SceneQuickView* sceneView() const;
  void setSceneView(Esri::ArcGISRuntime::SceneQuickView* sceneView);
  void display3DLabelsOnFeatureLayer(Esri::ArcGISRuntime::FeatureLayer* featureLayer);

  Esri::ArcGISRuntime::Scene* m_scene = nullptr;
  Esri::ArcGISRuntime::SceneQuickView* m_sceneView = nullptr;
};

#endif // SHOWLABELSONLAYERIN3D_H

// [WriteFile Name=ShowLabelsOnLayerIn3D, Category=Scenes]
// [Legal]
// Copyright 2021 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]

import QtQuick
import QtQuick.Controls
import Esri.Samples

Item {

    SceneView {
        id: view
        anchors.fill: parent

        Component.onCompleted: {
            // Set the focus on SceneView to initially enable keyboard navigation
            forceActiveFocus();
        }
    }

    // Declare the C++ instance which creates the scene etc. and supply the view
    ShowLabelsOnLayerIn3DSample {
        id: model
        sceneView: view
    }
}