Add a point, line, and polygon

Before starting this tutorial:

1. You need an ArcGIS Location Platform or ArcGIS Online account.

2. Your system meets the system requirements.

3. The ArcGIS Maps SDK for Qt, version 200.8.0 or later is installed.

4. The Qt 6.8.2 software development framework is installed.

Option 1: Develop the code

To start the tutorial, complete the Display a map tutorial. This creates a map to display the Santa Monica Mountains in California using the topographic basemap from the ArcGIS Basemap Styles service.

Open a Qt Creator project

1. Open the project you created by completing the Display a map tutorial.
2. Continue with the following instructions to display a point, line, and polygon in the map.

Add GraphicsOverlay class, declare member function

GraphicsOverlay is a container for temporary graphics to display on your map view. The graphics drawn in graphics overlays are created at runtime and are not persisted when your application closes. Learn more about GraphicsOverlay.

1. In the display_a_map project, double click Headers > Display_a_map.h to open the file. Add the GraphicsOverlay class to the namespace ArcGISRuntime declaration.

   Display_a_map.h

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   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 class Map; class MapQuickView;  class GraphicsOverlay; } 

2. Add the createGraphics private member function declaration. Then save and close the header file.

   Display_a_map.h

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   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 private:  Esri::ArcGISRuntime::MapQuickView* mapView() const;  void setMapView(Esri::ArcGISRuntime::MapQuickView* mapView);  void setupViewpoint();   void createGraphics(Esri::ArcGISRuntime::GraphicsOverlay* overlay); 

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Create a graphics overlay

A graphics overlay is a container for graphics. It is added to a map view to display graphics on a map. You can add more than one graphics overlay to a map view. Graphics overlays are displayed on top of all the other layers.

1. Double click on Sources > Display_a_map.cpp to open the file. Include the classes shown.

   Display_a_map.cpp

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   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 #include "Display_a_map.h" #include "Map.h" #include "MapQuickView.h" #include "MapTypes.h" #include "Point.h" #include "SpatialReference.h" #include <QFuture> #include "Viewpoint.h"  #include "Graphic.h" #include "GraphicListModel.h" #include "GraphicsOverlay.h" #include "GraphicsOverlayListModel.h" #include "PolylineBuilder.h" #include "PolygonBuilder.h" #include "SimpleFillSymbol.h" #include "SimpleLineSymbol.h" #include "SimpleMarkerSymbol.h" #include "SymbolTypes.h" 

2. In the Display_a_map::setMapView member function, add three lines of code to create a GraphicsOverlay, call the createGraphics method (implemented in following steps), and append the overlay to the map view.

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   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 // Set the view (created in QML) void Display_a_map::setMapView(MapQuickView* mapView) {  if (!mapView || mapView == m_mapView)  {  return;  }   m_mapView = mapView;  m_mapView->setMap(m_map);  setupViewpoint();   GraphicsOverlay* overlay = new GraphicsOverlay(this);  createGraphics(overlay);  m_mapView->graphicsOverlays()->append(overlay); 

3. Create a new method named Display_a_map::createGraphics, right after the Display_a_map::setupViewpoint method.

   Display_a_map.cpp

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   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 void Display_a_map::setupViewpoint() {  const Point center(-118.80543, 34.02700, SpatialReference::wgs84());  const Viewpoint viewpoint(center, 100000.0);  m_mapView->setViewpointAsync(viewpoint); }  void Display_a_map::createGraphics(GraphicsOverlay *overlay) {  } 

Add a point graphic

A point graphic is created using a point and a marker symbol. A point is defined with x and y coordinates for longitude and latitude coordinates, and a spatial reference. The spatial reference is WGS84.

1. Create a Point and a SimpleMarkerSymbol. To create the Point, provide longitude (x) and latitude (y) coordinates, and a SpatialReference.

   Point graphics support a number of symbol types such as SimpleMarkerSymbol, PictureMarkerSymbol_qt and TextSymbol. See Symbol in the API documentation to learn more about symbols.

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   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 void Display_a_map::setupViewpoint() {  const Point center(-118.80543, 34.02700, SpatialReference::wgs84());  const Viewpoint viewpoint(center, 100000.0);  m_mapView->setViewpointAsync(viewpoint); }  void Display_a_map::createGraphics(GraphicsOverlay *overlay) {   // Create a point  const Point dume_beach(-118.80657463861, 34.0005930608889, SpatialReference::wgs84());  // Create symbols for the point  SimpleLineSymbol* point_outline = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("blue"), 3, this);  SimpleMarkerSymbol* point_symbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Circle, QColor("red"), 10, this);  point_symbol->setOutline(point_outline);   // Create a graphic to display the point with its symbology  Graphic* point_graphic = new Graphic(dume_beach, point_symbol, this);  // Add point graphic to the graphics overlay  overlay->graphics()->append(point_graphic); 

2. Press Ctrl + R to run the app.

You should see a point graphic at Point Dume State Beach, California.

Add a polyline graphic

A line graphic is created using a polyline and a line symbol. A polyline is defined as a sequence of points.

Polylines have one or more distinct parts. Each part is defined by two points. To create a continuous line with just one part, use the Polyline constructor. To create a polyline with more than one part, use a PolylineBuilder. Polyline graphics support a number of symbol types, such as SimpleLineSymbol and TextSymbol. See Symbol in the API documentation to learn more about symbols.

1. Create a Polyline and a SimpleLineSymbol.

   To create the Polyline, create a new PointCollection with a SpatialReference and use PolylineBuilder to add a new Point objects to it. Add the highlighted code.

   Display_a_map.cpp

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   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  // Create a graphic to display the point with its symbology  Graphic* point_graphic = new Graphic(dume_beach, point_symbol, this);  // Add point graphic to the graphics overlay  overlay->graphics()->append(point_graphic);   // Create a line  PolylineBuilder* polyline_builder = new PolylineBuilder(SpatialReference::wgs84(), this);  polyline_builder->addPoint(-118.8215, 34.0140);  polyline_builder->addPoint(-118.8149, 34.0081);  polyline_builder->addPoint(-118.8089, 34.0017);  // Create a symbol for the line  SimpleLineSymbol* line_symbol = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor(Qt::blue), 3, this);   // Create a graphic to display the line with its symbology  Graphic* polyline_graphic = new Graphic(polyline_builder->toGeometry(), line_symbol, this);  // Add line graphic to the graphics overlay  overlay->graphics()->append(polyline_graphic); 

2. Press Ctrl + R to run the app.

You should see a point and a line graphic along Westward Beach.

Add a polygon graphic

A polygon graphic is created using a polygon and a fill symbol. A polygon is defined as a sequence of points that describe a closed boundary.

Polygons have one or more distinct parts. Each part is a sequence of points describing a closed boundary. For a single area with no holes, you can use Polygon to create a polygon with just one part. To create a polygon with more than one part, use PolygonBuilder.

Polygon graphics support a number of symbol types such as SimpleFillSymbol, PictureFillSymbol, SimpleMarkerSymbol, and TextSymbol. See Symbol in the API documentation to learn more about symbols.

1. Create a Polygon and a SimpleFillSymbol. To create the Polygon, create a new PointCollection with a SpatialReference and use PolygonBuilder to add new Point objects to it. Add the highlighted code.

   Display_a_map.cpp

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   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  // Create a graphic to display the line with its symbology  Graphic* polyline_graphic = new Graphic(polyline_builder->toGeometry(), line_symbol, this);  // Add line graphic to the graphics overlay  overlay->graphics()->append(polyline_graphic);   // Create a list of points to make up the polygon  const QList<Point> points = {  Point(-118.8190, 34.0138),  Point(-118.8068, 34.0216),  Point(-118.7914, 34.0164),  Point(-118.7960, 34.0086),  Point(-118.8086, 34.0035),  };  // Create a polygon using the list of points above  PolygonBuilder* polygon_builder = new PolygonBuilder(SpatialReference::wgs84(), this);  polygon_builder->addPoints(points);  // Create symbols for the polygon  SimpleLineSymbol* polygon_line_symbol = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor(Qt::blue), 3, this);  SimpleFillSymbol* fill_symbol = new SimpleFillSymbol(SimpleFillSymbolStyle::Solid, QColor(Qt::yellow), polygon_line_symbol, this);  // Create a graphic to display the polygon with its symbology  Graphic* polygon_graphic = new Graphic(polygon_builder->toGeometry(), fill_symbol, this);  // Add polygon graphic to the graphics overlay  overlay->graphics()->append(polygon_graphic); 

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2. Press Ctrl + R to run the app.

You should see a point, line, and polygon graphic around Mahou Riviera in the Santa Monica Mountains.

Option 2: Download the solution

1. Click the Download solution link under Solution and unzip the file to a location on your machine.

2. Open the project in Qt Creator.

Since the downloaded solution does not contain authentication credentials, you must set up authentication to create the developer credentials and add them to the project.

Set up authentication

To access the secure ArcGIS location services used in this tutorial, you must implement API key authentication using an ArcGIS Location Platform or an ArcGIS Online account.

Set developer credentials in the solution

To allow your app users to access ArcGIS location services, use the developer credentials that you created in the Set up authentication step to authenticate requests for resources.

Run the solution

Press Ctrl + R to run the app.

You should see a point, line, and polygon graphic around Mahou Riviera in the Santa Monica Mountains.