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Add a point, line, and polygon | ArcGIS Maps SDK for Qt

Learn how to display point, line, and polygon graphics in a map.

You typically use graphics to display geographic data that is not connected to a database and that is not persisted, like highlighting a route between two locations, displaying a search buffer around a selected point, or showing the location of map coordinates entered by the user. Graphics are composed of a geometry, symbol, and attributes.

In this tutorial, you display points, lines, and polygons on a map as graphics.

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.

For simplicity, the steps for the ArcGIS Maps SDK for Qt tutorials are shown for creating Windows Desktop apps on a Windows desktop computer. Qt being cross-platform, allows for the flexibility to create apps on multiple configurations, such as Android, Linux, and macOS. If you are developing a non-Windows machine, you will need to make adjustments as you work through the tutorials.

When completing the tutorials, it is recommended that following Qt Creator setting is used:

• In the menu bar, choose Edit > Preferences...
• In the Preferences- Qt Creator dialog, on the left choose C++
• Make the Coding Style tab active
• In the ClangFormat settings section, ensure the Formatting Mode is set to Use built-in indenter

You have two options for completing this tutorial:

1. Option 1: Develop the code or
2. Option 2: Download the completed solution

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.

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.

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 and close the header file.

   Display_a_map.h

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

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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)
   {
   
   }
   

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::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.

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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       // 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.

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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       // 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);
   

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.

Alternatively, you can download the tutorial solution, as follows.

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.

   Note

   The Configure Project window may appear for you to specify the Qt Kit to use to compile the project. If you are using ArcGIS Maps SDK for Qt (v200.7) or greater, check on the Qt Kit called Desktop Qt 6.8.2 MSVC2022 64bit before clicking the Configure Project button at the bottom of the page.

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.

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.

Create a new API key access token with privileges to access the secure resources used in this tutorial.

1. Complete the Create an API key tutorial and create an API key with the following privilege(s):

   • Privileges
     • Location services > Basemaps

2. Copy and paste the API key access token into a safe location. It will be used in a later step.

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.

1. In the Projects window, go to the Sources folder

2. Open the main.cpp file.

3. Modify the code to set the accessToken using your API key access token.

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       // 2. API key authentication: Get a long-lived access token that gives your application access to
       // ArcGIS location services. Go to the tutorial at https://links.esri.com/create-an-api-key.
       // Copy the API Key access token.
   
       const QString accessToken = QString("");
   

4. Save and close the file.

Best Practice: The access token is stored directly in the code as a convenience for this tutorial. Do not store credentials directly in source code in a production environment.

Press Ctrl + R to run the app.

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

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

• Add a feature layer
• Search for an address
• Find a route and directions
• Display a web map
• Display a scene

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