Add a point, line, and polygon

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 point, or tracking the location of a vehicle in real-time. Graphics are composed of a geometry, symbol, and attributes.

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

To learn how to display data from data sources, see the Add a feature layer tutorial.

Prerequisites

Steps

Open a Java project with Gradle

1. To start this tutorial, complete the Display a map tutorial, or download and unzip the Display a map solution into a new folder.

2. Open the build.gradle file as a project in IntelliJ IDEA.

3. If you downloaded the solution project, set your API key.

   More info

   An API Key enables access to services, web maps, and web scenes hosted in ArcGIS Online.

   1. Go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

   2. In the IntelliJ IDEA > Project tool window, open src/main/java/com.example.app and click App.

   3. In the start() method, set the API key property on the ArcGISRuntimeEnvironment with your API key. Replace YOUR_API_KEY with your actual API Key. Be sure to surround your API Key with quotes, because the parameter passed to setApiKey is a string.

   App.java

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     @Override
     public void start(Stage stage) {
       // set the title and size of the stage and show it
       stage.setTitle("Display a map tutorial");
       stage.setWidth(800);
       stage.setHeight(700);
       stage.show();
   
       // create a JavaFX scene with a stack pane as the root node, and add it to the scene
       StackPane stackPane = new StackPane();
       Scene scene = new Scene(stackPane);
       stage.setScene(scene);
   
       // Note: it is not best practice to store API keys in source code.
       // The API key is referenced here for the convenience of this tutorial.
       String yourApiKey = "YOUR_API_KEY";
       ArcGISRuntimeEnvironment.setApiKey(yourApiKey);
   

Add import statements

Add import statements to reference the ArcGIS Runtime API classes.

1. In the IntelliJ IDEA > Project tool window, open src/main/java/com.example.app and click App.

2. Add the following imports above the existing imports:

   App.java

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   import com.esri.arcgisruntime.geometry.Point;
   import com.esri.arcgisruntime.geometry.PointCollection;
   import com.esri.arcgisruntime.geometry.Polygon;
   import com.esri.arcgisruntime.geometry.Polyline;
   import com.esri.arcgisruntime.geometry.SpatialReferences;
   import com.esri.arcgisruntime.mapping.Viewpoint;
   import com.esri.arcgisruntime.mapping.view.Graphic;
   import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
   import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
   import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
   import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.view.MapView;
   

Add a graphics overlay

A graphics overlay is a container for graphics. It is used with 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. In the start() method, create a new GraphicsOverlay and add it to the mapView.

   App.java

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       // set the map on the map view
       mapView.setMap(map);
       mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72223.819286));
   
       // create a graphics overlay and add it to the map view
       GraphicsOverlay graphicsOverlay = new GraphicsOverlay();
       mapView.getGraphicsOverlays().add(graphicsOverlay);
   

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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, and a spatial reference. For latitude and longitude coordinates, 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. Use the SpatialReferences.getWgs84() convenience getter.

   App.java

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       // create a graphics overlay and add it to the map view
       GraphicsOverlay graphicsOverlay = new GraphicsOverlay();
       mapView.getGraphicsOverlays().add(graphicsOverlay);
   
       // create a point geometry with a location and spatial reference
       Point point = new Point(-118.80657463861, 34.0005930608889, SpatialReferences.getWgs84());
       // create an opaque orange (0xFFFF5733) point symbol with a blue (0xFF0063FF) outline symbol
       SimpleMarkerSymbol simpleMarkerSymbol =
         new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, 0xFFFF5733, 10);
       SimpleLineSymbol blueOutlineSymbol =
         new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFF0063FF, 2);
   
       simpleMarkerSymbol.setOutline(blueOutlineSymbol);
   
   

   Expand

2. Create a Graphic with the point and simpleMarkerSymbol. Display the Graphic by adding it to the graphicsOverlay's graphics collection with getGraphics().

   More info

   Point graphics support a number of symbol types such as SimpleMarkerSymbol, PictureMarkerSymbol and TextSymbol. Learn more about the symbols in the API documentation.

   App.java

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       simpleMarkerSymbol.setOutline(blueOutlineSymbol);
   
       // create a graphic with the point geometry and symbol
       Graphic pointGraphic = new Graphic(point, simpleMarkerSymbol);
   
       // add the point graphic to the graphics overlay
       graphicsOverlay.getGraphics().add(pointGraphic);
   

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3. Run the app. Ensure to run the app as a Gradle task and not as an application in your IDE. In the Gradle tool window, under Tasks > application, click run.

You should see a point graphic in Point Dume State Beach.

Add a line graphic

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

1. Create a Polyline and a SimpleLineSymbol.

   To create the Polyline, create a new PointCollection with a SpatialReference and add new Points to it.

   More info

   Polyline graphics support a number of symbol types such as SimpleLineSymbol and TextSymbol. Learn more about the symbols in the API documentation.

   App.java

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       // add the point graphic to the graphics overlay
       graphicsOverlay.getGraphics().add(pointGraphic);
   
       // create a point collection with a spatial reference, and add three points to it
       PointCollection polylinePoints = new PointCollection(SpatialReferences.getWgs84());
       polylinePoints.add(new Point(-118.821527826096, 34.0139576938577));
       polylinePoints.add(new Point(-118.814893761649, 34.0080602407843));
       polylinePoints.add(new Point(-118.808878330345, 34.0016642996246));
       // create a polyline geometry from the point collection
       Polyline polyline = new Polyline(polylinePoints);
   
       // create a blue line symbol for the polyline
       SimpleLineSymbol polylineSymbol =
         new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFF0063FF, 3);
   
   

   Expand

2. Create a Graphic with the polyline and polylineSymbol. Display the Graphic by adding it to the graphicsOverlay's graphics collection with getGraphics().

   App.java

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       // create a blue line symbol for the polyline
       SimpleLineSymbol polylineSymbol =
         new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFF0063FF, 3);
   
       // create a polyline graphic with the polyline geometry and symbol
       Graphic polylineGraphic = new Graphic(polyline, polylineSymbol);
   
       // add the polyline graphic to the graphics overlay
       graphicsOverlay.getGraphics().add(polylineGraphic);
   

   Expand

3. Run the app. Ensure to run the app as a Gradle task and not as an application in your IDE. In the Gradle tool window, under Tasks > application, click run.

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.

1. Create a Polygon and a SimpleFillSymbol. To create the Polygon, create a new PointCollection with a SpatialReference and add new Points to it.

   More info

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

   App.java

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       // add the polyline graphic to the graphics overlay
       graphicsOverlay.getGraphics().add(polylineGraphic);
   
       // create a point collection with a spatial reference, and add five points to it
       PointCollection polygonPoints = new PointCollection(SpatialReferences.getWgs84());
       polygonPoints.add(new Point(-118.818984489994, 34.0137559967283));
       polygonPoints.add(new Point(-118.806796597377, 34.0215816298725));
       polygonPoints.add(new Point(-118.791432890735, 34.0163883241613));
       polygonPoints.add(new Point(-118.795966865355, 34.0085648646355));
       polygonPoints.add(new Point(-118.808558110679, 34.0035027131376));
       // create a polygon geometry from the point collection
       Polygon polygon = new Polygon(polygonPoints);
   
       // create an orange fill symbol with 20% transparency and the blue simple line symbol
       SimpleFillSymbol polygonFillSymbol =
         new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, 0x80FF5733, blueOutlineSymbol);
   
   

   Expand

2. Create a Graphic with the polygon and polygonSymbol. Display the Graphic by adding it to the graphicsOverlay's graphics collection with getGraphics().

   App.java

   Expand

   Use dark colors for code blocks

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   Add line.Add line.Add line.Add line.

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       // create an orange fill symbol with 20% transparency and the blue simple line symbol
       SimpleFillSymbol polygonFillSymbol =
         new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, 0x80FF5733, blueOutlineSymbol);
   
       // create a polygon graphic from the polygon geometry and symbol
       Graphic polygonGraphic = new Graphic(polygon, polygonFillSymbol);
       // add the polygon graphic to the graphics overlay
       graphicsOverlay.getGraphics().add(polygonGraphic);
   

   Expand

3. Run the app. Ensure to run the app as a Gradle task and not as an application in your IDE. In the Gradle tool window, under Tasks > application, click run.

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

What's next?

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