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 or later 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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   class Map;
   
   class MapQuickView;
   
   class GraphicsOverlay;
   
   }
   

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

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

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.

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   #include "Display_a_map.h"
   #include "Map.h"
   
   #include "MapTypes.h"
   
   #include "MapQuickView.h"
   
   #include "Point.h"
   #include "Viewpoint.h"
   #include "SpatialReference.h"
   #include <QFuture>
   
   #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 setMapView(MapQuickView* mapView) 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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   // 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 createGraphics(GraphicsOverlay *overlay), right after the setupViewpoint() method.

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   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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   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);
   
   }
   

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.

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   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);
   
       // 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);
   
   }
   

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.

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   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);
   
       // 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);
   
       // 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);
   
   }
   

Set developer credentials

Now to complete this tutorial, click on the switcher for either API key authentication or User authentication options to use the correct authentication pattern to run the application.

You will need to supply the correct information for the authentication pattern you choose, this information was obtained when completing the Display a map tutorial.

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ARCGIS_RUNTIME_VERSION = 200.8.0
include($$PWD/arcgisruntime.pri)

# TODO: You need to replace the <path_to_toolkit_repo> with a valid location where the Qt Toolkit
# resides on your system, example: C:/arcgis-maps-sdk-toolkit-qt/uitools/toolkitcpp/toolkitcpp.pri
# This block determines whether you've cloned your toolkit
PATH_TO_TOOLKIT = "<path_to_toolkit_repo>/uitools/toolkitcpp/toolkitcpp.pri"

exists($${PATH_TO_TOOLKIT}) {
  message("Toolkit found")
  DEFINES += TOOLKIT_FOUND

  # include the toolkitcpp.pri, which contains all the toolkit resources
  include($${PATH_TO_TOOLKIT})

  qtHaveModule(webenginequick) {
    QT += webenginequick
  }
} else {
  message("Toolkit not found in provided path. Either set PATH_TO_TOOLKIT or use an API Key")
}

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{

#ifdef TOOLKIT_FOUND

    // Define the Redirect URL string obtained when creating the OAuth credentials.
    // TODO: You need to replace the "REDIRECT_URL" with your own valid string,
    // ex: "urn:ietf:wg:oauth:2.0:oob"
    const auto qStringRedirectUrl = QString{"REDIRECT_URL"};

    // Define the URL of the portal to authenticate with.
    const QUrl qUrlPortal = QUrl{"https://www.arcgis.com/"};

    // Define a unique identifier associated with an application registered with the
    // portal that assists with client/server OAuth authentication.
    // TODO: You need to replace the "CLIENT_ID" with your own valid string.
    const QString qStringClientId = QString{"CLIENT_ID"};

    // Create a new OAuth user configuration using: the Url to mapping web service, the Client ID
    // string, and the Redirect Url string.
    auto* oAuthUserConfiguration = new OAuthUserConfiguration(qUrlPortal, qStringClientId,
                                                              qStringRedirectUrl, this);

    // Call the Toolkit's OAuthUserConfigurationManager static `addConfiguration`
    // method to use the OAuth dialog. This will tell the Authenticator to use OAuth for the provided configuration.
    Toolkit::OAuthUserConfigurationManager::addConfiguration(oAuthUserConfiguration);
#endif // TOOLKIT_FOUND

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 .pro project file 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.

Now to complete this tutorial, click on the switcher for either API key authentication or User authentication options to use the correct authentication pattern to run the application.

You will need to supply the correct information for the authentication pattern you choose, this information was obtained when completing the Display a map tutorial.

Set developer credentials in the solution

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ARCGIS_RUNTIME_VERSION = 200.8.0
include($$PWD/arcgisruntime.pri)

# TODO: You need to replace the <path_to_toolkit_repo> with a valid location where the Qt Toolkit
# resides on your system, example: C:/arcgis-maps-sdk-toolkit-qt/uitools/toolkitcpp/toolkitcpp.pri
# This block determines whether you've cloned your toolkit
PATH_TO_TOOLKIT = "<path_to_toolkit_repo>/uitools/toolkitcpp/toolkitcpp.pri"

exists($${PATH_TO_TOOLKIT}) {
  message("Toolkit found")
  DEFINES += TOOLKIT_FOUND

  # include the toolkitcpp.pri, which contains all the toolkit resources
  include($${PATH_TO_TOOLKIT})

  qtHaveModule(webenginequick) {
    QT += webenginequick
  }
} else {
  message("Toolkit not found in provided path. Either set PATH_TO_TOOLKIT or use an API Key")
}

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{

#ifdef TOOLKIT_FOUND

    // Define the Redirect URL string obtained when creating the OAuth credentials.
    // TODO: You need to replace the "REDIRECT_URL" with your own valid string,
    // ex: "urn:ietf:wg:oauth:2.0:oob"
    const auto qStringRedirectUrl = QString{"REDIRECT_URL"};

    // Define the URL of the portal to authenticate with.
    const QUrl qUrlPortal = QUrl{"https://www.arcgis.com/"};

    // Define a unique identifier associated with an application registered with the
    // portal that assists with client/server OAuth authentication.
    // TODO: You need to replace the "CLIENT_ID" with your own valid string.
    const QString qStringClientId = QString{"CLIENT_ID"};

    // Create a new OAuth user configuration using: the Url to mapping web service, the Client ID
    // string, and the Redirect Url string.
    auto* oAuthUserConfiguration = new OAuthUserConfiguration(qUrlPortal, qStringClientId,
                                                              qStringRedirectUrl, this);

    // Call the Toolkit's OAuthUserConfigurationManager static `addConfiguration`
    // method to use the OAuth dialog. This will tell the Authenticator to use OAuth for the provided configuration.
    Toolkit::OAuthUserConfigurationManager::addConfiguration(oAuthUserConfiguration);
#endif // TOOLKIT_FOUND

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.