Create terrain surface from a local raster

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
// [WriteFile Name=CreateTerrainSurfaceFromLocalRaster, 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

// sample headers
#include "CreateTerrainSurfaceFromLocalRaster.h"

// ArcGIS Maps SDK headers
#include "Camera.h"
#include "ElevationSourceListModel.h"
#include "Error.h"
#include "MapTypes.h"
#include "RasterElevationSource.h"
#include "Scene.h"
#include "SceneQuickView.h"
#include "Surface.h"

// Qt headers
#include <QFileInfo>
#include <QStandardPaths>
#include <QUrl>

using namespace Esri::ArcGISRuntime;

// helper method to get cross platform data path
namespace
{
  QString defaultDataPath()
  {
    QString dataPath;

    #ifdef Q_OS_IOS
      dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
    #else
      dataPath = QStandardPaths::writableLocation(QStandardPaths::HomeLocation);
    #endif

    return dataPath;
  }
}

CreateTerrainSurfaceFromLocalRaster::CreateTerrainSurfaceFromLocalRaster(QObject* parent /* = nullptr */):
  QObject(parent),
  m_scene(new Scene(BasemapStyle::ArcGISImageryStandard, this))
{
  // create the MontereyElevation data path
  // data is downloaded automatically by the sample viewer app. Instructions to download
  // separately are specified in the readme.
  const QString montereyRasterElevationPath = QString{defaultDataPath() + "/ArcGIS/Runtime/Data/raster/MontereyElevation.dt2"};

  //Before attempting to add any layers, check that the file for the elevation source exists at all.
  const bool srcElevationFileExists = QFileInfo::exists(montereyRasterElevationPath);

  if(srcElevationFileExists)
  {
    //Create the elevation source from the local raster(s). RasterElevationSource can take multiple files as inputs, but in this case only takes one.
    RasterElevationSource* elevationSrc = new RasterElevationSource{QStringList{montereyRasterElevationPath}, this};

    //When the elevation source is finished loading, call the elevationSrcFinishedLoading callback, so we can tell if it loaded succesfully.
    connect(elevationSrc, &RasterElevationSource::doneLoading, this, &CreateTerrainSurfaceFromLocalRaster::elevationSrcFinishedLoading, Qt::UniqueConnection);

    // add the elevation source to the scene to display elevation
    m_scene->baseSurface()->elevationSources()->append(elevationSrc);
  }
  else
  {
    qWarning() << "Could not find file at : " << montereyRasterElevationPath << ". Elevation source not set.";
  }
}

void CreateTerrainSurfaceFromLocalRaster::elevationSrcFinishedLoading(const Error& loadError)
{
  if(loadError.isEmpty())
  {
    //Succesful load
    qInfo() << "Loaded raster elevation source succesfully";
  }
  else {
    //Log failure to load
    qWarning() << "Error loading elevation source : " << loadError.message();
  }
}

CreateTerrainSurfaceFromLocalRaster::~CreateTerrainSurfaceFromLocalRaster() = default;

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

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

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

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

  // Create a camera, looking at Monterey, California.
  constexpr double latitude = 36.51;
  constexpr double longitude = -121.80;
  constexpr double altitude = 300.0;
  constexpr double heading = 0.0;
  constexpr double pitch = 70.0;
  constexpr double roll = 0.0;
  Camera camera{latitude, longitude, altitude, heading, pitch, roll};

  // Set the sceneview to use above camera, waits for load so scene is immediately displayed in appropriate place.
  m_sceneView->setViewpointCameraAndWait(camera);

  emit sceneViewChanged();
}