Convex hull

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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
// [WriteFile Name=ConvexHull, Category=Geometry]
// [Legal]
// Copyright 2020 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 "ConvexHull.h"

#include "GeometryEngine.h"
#include "Graphic.h"
#include "GraphicsOverlay.h"
#include "Map.h"
#include "MapQuickView.h"
#include "MultipointBuilder.h"
#include "PointCollection.h"
#include "SimpleFillSymbol.h"
#include "SimpleMarkerSymbol.h"
#include "MapTypes.h"
#include "SymbolTypes.h"
#include "GraphicListModel.h"
#include "Error.h"
#include "GraphicsOverlayListModel.h"
#include "Geometry.h"
#include "GeometryTypes.h"
#include "SimpleLineSymbol.h"
#include "Point.h"
#include "SpatialReference.h"

using namespace Esri::ArcGISRuntime;

ConvexHull::ConvexHull(QObject* parent /* = nullptr */):
  QObject(parent),
  m_map(new Map(BasemapStyle::ArcGISTopographic, this))
{
  setupGraphics();
}

ConvexHull::~ConvexHull() = default;

void ConvexHull::init()
{
  // Register the map view for QML
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<ConvexHull>("Esri.Samples", 1, 0, "ConvexHullSample");
}

MapQuickView* ConvexHull::mapView() const
{
  return m_mapView;
}

void ConvexHull::displayConvexHull()
{
  if (m_inputsGraphic->geometry().isEmpty())
    return;

  // normalizing the geometry before performing geometric operations
  const Geometry normalizedPoints = GeometryEngine::normalizeCentralMeridian(m_inputsGraphic->geometry());
  const Geometry convexHull = GeometryEngine::convexHull(normalizedPoints);

  // change the symbol based on the returned geometry type
  if (convexHull.geometryType() == GeometryType::Point)
  {
    m_convexHullGraphic->setSymbol(m_markerSymbol);
  }
  else if (convexHull.geometryType() == GeometryType::Polyline)
  {
    m_convexHullGraphic->setSymbol(m_lineSymbol);
  }
  else if (convexHull.geometryType() == GeometryType::Polygon)
  {
    m_convexHullGraphic->setSymbol(m_fillSymbol);
  }
  else
  {
    qWarning("Not a valid geometry.");
  }

  m_convexHullGraphic->setGeometry(convexHull);
}

void ConvexHull::clearGraphics()
{
  if (m_multipointBuilder)
    m_multipointBuilder->points()->removeAll();
  if (m_inputsGraphic)
    m_inputsGraphic->setGeometry(Geometry());
  if (m_convexHullGraphic)
    m_convexHullGraphic->setGeometry(Geometry());
}

void ConvexHull::setupGraphics()
{
  // graphics overlay to show clicked points and convex hull
  m_graphicsOverlay = new GraphicsOverlay(this);

  // create a graphic to show clicked points
  m_markerSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Circle, Qt::red, 10, this);
  m_inputsGraphic = new Graphic(this);
  m_inputsGraphic->setSymbol(m_markerSymbol);
  m_graphicsOverlay->graphics()->append(m_inputsGraphic);

  // create a graphic to display the convex hull
  m_convexHullGraphic = new Graphic(this);
  m_graphicsOverlay->graphics()->append(m_convexHullGraphic);

  // create a graphic to show the convex hull
  m_lineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, Qt::blue, 3, this);
  m_fillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle::Null, Qt::transparent, m_lineSymbol, this);
}

void ConvexHull::getInputs()
{
  // show clicked points on MapView
  connect(m_mapView, &MapQuickView::mouseClicked, this, [this](QMouseEvent& e)
  {
    e.accept();

    const Point clickedPoint = m_mapView->screenToLocation(e.pos().x(), e.pos().y());
    m_multipointBuilder->points()->addPoint(clickedPoint);
    m_inputsGraphic->setGeometry(m_multipointBuilder->toGeometry());
  });
}

// Set the view (created in QML)
void ConvexHull::setMapView(MapQuickView* mapView)
{
  if (!mapView || mapView == m_mapView)
    return;

  m_mapView = mapView;
  m_mapView->setMap(m_map);

  // wait for map to load before creating multipoint builder
  connect(m_map, &Map::doneLoading, this, [this](Error e){
    if (!e.isEmpty())
    {
      qDebug() << e.message() << e.additionalMessage();
      return;
    }

    if (m_map->loadStatus() == LoadStatus::FailedToLoad)
    {
      qWarning( "Failed to load map.");
      return;
    }

    m_multipointBuilder = new MultipointBuilder(m_map->spatialReference(), this);
  });

  getInputs();

  m_mapView->graphicsOverlays()->append(m_graphicsOverlay);
  emit mapViewChanged();
}