Add a point, line, and polygon

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

add a point line and polygon

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.

Prerequisites

Before starting this tutorial:

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

  2. A development and deployment environment that meets the system requirements.

  3. An IDE for Android development in Kotlin.

Steps

Open an Android Studio project

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

  2. Modify the old project for use in this new tutorial. Expand More info for instructions.

  3. If you downloaded the solution, get an access token and set the API key in MainActivity.kt.

Add import statements

  1. In the Android tool window, open app > kotlin+java > com.example.app > MainScreen.kt. Replace the import statements with the imports needed for this tutorial.

    MainScreen.kt
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    @file:OptIn(ExperimentalMaterial3Api::class)
    
    package com.example.app.screens
    
    import androidx.compose.foundation.layout.fillMaxSize
    import androidx.compose.foundation.layout.padding
    import androidx.compose.material3.ExperimentalMaterial3Api
    import androidx.compose.material3.Scaffold
    import androidx.compose.material3.Text
    import androidx.compose.material3.TopAppBar
    import androidx.compose.runtime.Composable
    import androidx.compose.runtime.remember
    import androidx.compose.ui.Modifier
    import androidx.compose.ui.res.stringResource
    import com.arcgismaps.Color
    import com.arcgismaps.geometry.Point
    import com.arcgismaps.geometry.PolygonBuilder
    import com.arcgismaps.geometry.PolylineBuilder
    import com.arcgismaps.geometry.SpatialReference
    import com.arcgismaps.mapping.ArcGISMap
    import com.arcgismaps.mapping.BasemapStyle
    import com.arcgismaps.mapping.Viewpoint
    import com.arcgismaps.mapping.symbology.SimpleFillSymbol
    import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle
    import com.arcgismaps.mapping.symbology.SimpleLineSymbol
    import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
    import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
    import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
    import com.arcgismaps.mapping.view.Graphic
    import com.arcgismaps.mapping.view.GraphicsOverlay
    import com.arcgismaps.toolkit.geoviewcompose.MapView
    import com.example.app.R
    
    // Create a blue outline symbol.
    

Add a graphics overlay and a list of graphics overlay

You will create a GraphicsOverlay. Then add the graphics overlay to a list named graphicsOverlays.

In subsequent sections of this tutorial, you will create a point, a line, and a polygon and add each of them to the GraphicsOverlay.

  1. In the MainScreen composable, add a remember block and create a GraphicsOverlay inside it. Then assign remember to a local variable named graphicsOverlay.

    MainScreen.kt
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    @Composable
    fun MainScreen() {
        // create an ArcGISMap
        val map = remember {
            createMap()
        }
    
        // Create a graphics overlay.
        val graphicsOverlay = remember { GraphicsOverlay() }
    
        Scaffold(
            topBar = { TopAppBar(title = { Text(text = stringResource(id = R.string.app_name)) }) }
        ) {
            MapView(
                modifier = Modifier.fillMaxSize().padding(it),
                arcGISMap = map,
    
            )
        }
    
    Expand
  2. Add a remember block. Inside it, create a list that contains the graphicsOverlay you just created. Then assign remember to a local variable named graphicsOverlays.

    MainScreen.kt
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    @Composable
    fun MainScreen() {
        // create an ArcGISMap
        val map = remember {
            createMap()
        }
    
        // Create a graphics overlay.
        val graphicsOverlay = remember { GraphicsOverlay() }
    
        // Create a list of graphics overlays used by the MapView
        val graphicsOverlays = remember { listOf(graphicsOverlay) }
    
    Expand
  3. Pass graphicsOverlays as the graphicsOverlays argument to MapView.

    MainScreen.kt
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        Scaffold(
            topBar = { TopAppBar(title = { Text(text = stringResource(id = R.string.app_name)) }) }
        ) {
            MapView(
                modifier = Modifier.fillMaxSize().padding(it),
                arcGISMap = map,
    
                graphicsOverlays = graphicsOverlays
    
            )
        }
    
    Expand

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 lazy top-level property named blueOutlineSymbol. In the lazy block, create a solid, blue, 2px-wide SimpleLineSymbol.

    MainScreen.kt
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    // Create a blue outline symbol.
    private val blueOutlineSymbol by lazy {
        SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.fromRgba(0, 0, 255), 2f)
    }
    
    Expand
  2. Create a lazy top-level property named pointGraphic.

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    private val pointGraphic by lazy {
    
    }
    
    Expand
  3. In the lazy block of thepointGraphic property , create a Point and a SimpleMarkerSymbol. To create the point, provide x (longitude) and y (latitude) coordinates and a SpatialReference (by calling wgs84() on SpatialReference).

    Assign blueOutlineSymbol to the outline property of simpleMarkerSymbol.

    MainScreen.kt
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    private val pointGraphic by lazy {
    
        // Create a point geometry with a location and spatial reference.
        // Point(latitude, longitude, spatial reference)
        val point = Point(
            x = -118.8065,
            y = 34.0005,
            spatialReference = SpatialReference.wgs84()
        )
    
        // Create a point symbol that is an small red circle and assign the blue outline symbol to its outline property.
        val simpleMarkerSymbol = SimpleMarkerSymbol(
            style = SimpleMarkerSymbolStyle.Circle,
            color = Color.red,
            size = 10f
        )
        simpleMarkerSymbol.outline = blueOutlineSymbol
    
    }
    
    Expand
  4. Create a Graphic with point and simpleMarkerSymbol.

    MainScreen.kt
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    private val pointGraphic by lazy {
    
        // Create a point geometry with a location and spatial reference.
        // Point(latitude, longitude, spatial reference)
        val point = Point(
            x = -118.8065,
            y = 34.0005,
            spatialReference = SpatialReference.wgs84()
        )
    
        // Create a point symbol that is an small red circle and assign the blue outline symbol to its outline property.
        val simpleMarkerSymbol = SimpleMarkerSymbol(
            style = SimpleMarkerSymbolStyle.Circle,
            color = Color.red,
            size = 10f
        )
        simpleMarkerSymbol.outline = blueOutlineSymbol
    
        // Create a graphic with the point geometry and symbol.
        Graphic(
            geometry = point,
            symbol = simpleMarkerSymbol
        )
    
    }
    
    Expand
  5. In MainScreen, display the graphic by adding it to the graphics property of graphicsOverlay.

    MainScreen.kt
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    @Composable
    fun MainScreen() {
        // create an ArcGISMap
        val map = remember {
            createMap()
        }
    
        // Create a graphics overlay.
        val graphicsOverlay = remember { GraphicsOverlay() }
    
        // Add the point graphic to the graphics overlay.
        graphicsOverlay.graphics.add(pointGraphic)
    
        // Create a list of graphics overlays used by the MapView
        val graphicsOverlays = remember { listOf(graphicsOverlay) }
    
    Expand

Click Run > Run > app to run the app.

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 lazy top-level property named polylineGraphic.

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    private val polylineGraphic by lazy {
    
    }
    
    Expand
  2. In the lazy block, create a Polyline and a SimpleLineSymbol. To create the polyline, create a PolylineBuilder and then call toGeometry() on the polygon builder.

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    private val polylineGraphic by lazy {
    
        // Create a blue line symbol for the polyline.
        val polylineSymbol = SimpleLineSymbol(
            style = SimpleLineSymbolStyle.Solid,
            color = Color.fromRgba(0, 0, 255),
            width = 3f
        )
    
        // Create a polylineBuilder with a spatial reference and add three points to it.
        val polylineBuilder = PolylineBuilder(SpatialReference.wgs84()) {
            addPoint(-118.8215, 34.0139)
            addPoint(-118.8148, 34.0080)
            addPoint(-118.8088, 34.0016)
        }
        // then get the polyline from the polyline builder
        val polyline = polylineBuilder.toGeometry()
    
    }
    
    Expand
  3. Create a Graphic with polyline and polylineSymbol.

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    private val polylineGraphic by lazy {
    
        // Create a blue line symbol for the polyline.
        val polylineSymbol = SimpleLineSymbol(
            style = SimpleLineSymbolStyle.Solid,
            color = Color.fromRgba(0, 0, 255),
            width = 3f
        )
    
        // Create a polylineBuilder with a spatial reference and add three points to it.
        val polylineBuilder = PolylineBuilder(SpatialReference.wgs84()) {
            addPoint(-118.8215, 34.0139)
            addPoint(-118.8148, 34.0080)
            addPoint(-118.8088, 34.0016)
        }
        // then get the polyline from the polyline builder
        val polyline = polylineBuilder.toGeometry()
    
        // Create a polyline graphic with the polyline geometry and symbol.
        Graphic(
            geometry = polyline,
            symbol = polylineSymbol
        )
    
    }
    
    Expand
  4. In MainScreen, display the graphic by adding it to the graphics property of graphicsOverlay.

    MainScreen.kt
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    @Composable
    fun MainScreen() {
        // create an ArcGISMap
        val map = remember {
            createMap()
        }
    
        // Create a graphics overlay.
        val graphicsOverlay = remember { GraphicsOverlay() }
    
        // Add the point graphic to the graphics overlay.
        graphicsOverlay.graphics.add(pointGraphic)
    
        // Add the polyline graphic to the graphics overlay.
        graphicsOverlay.graphics.add(polylineGraphic)
    
        // Create a list of graphics overlays used by the MapView
        val graphicsOverlays = remember { listOf(graphicsOverlay) }
    
    Expand

Click Run > Run > app to run the app.

You should see a point and 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 lazy top-level property named polygonGraphic.

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    private val polygonGraphic by lazy {
    
    }
    
    Expand
  2. In the lazy block, create a Polygon and a SimpleFillSymbol. To create the polygon, create a PolygonBuilder and then call toGeometry() on the polygon builder.

    Next, create a SimpleFillSymbol that has a solid red fill with an alpha channel of 128 and uses the blueOutlineSymbol defined earlier.

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    private val polygonGraphic by lazy {
    
        // Create a polygon builder with a spatial reference and add five vertices (points) to it.
        // Then get the polygon from the polygon builder.
        val polygonBuilder = PolygonBuilder(SpatialReference.wgs84()) {
            addPoint(-118.8189, 34.0137)
            addPoint(-118.8067, 34.0215)
            addPoint(-118.7914, 34.0163)
            addPoint(-118.7959, 34.0085)
            addPoint(-118.8085, 34.0035)
        }
        val polygon = polygonBuilder.toGeometry()
    
        // Create a red fill symbol with an alpha component of 128: values can run from 0 to 255).
        val polygonFillSymbol = SimpleFillSymbol(
            style = SimpleFillSymbolStyle.Solid,
            color = Color.fromRgba(255, 0, 0, 128),
            outline = blueOutlineSymbol
        )
    
    }
    
    Expand
  3. Create a Graphic with polygon and polygonFillSymbol.

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    private val polygonGraphic by lazy {
    
        // Create a polygon builder with a spatial reference and add five vertices (points) to it.
        // Then get the polygon from the polygon builder.
        val polygonBuilder = PolygonBuilder(SpatialReference.wgs84()) {
            addPoint(-118.8189, 34.0137)
            addPoint(-118.8067, 34.0215)
            addPoint(-118.7914, 34.0163)
            addPoint(-118.7959, 34.0085)
            addPoint(-118.8085, 34.0035)
        }
        val polygon = polygonBuilder.toGeometry()
    
        // Create a red fill symbol with an alpha component of 128: values can run from 0 to 255).
        val polygonFillSymbol = SimpleFillSymbol(
            style = SimpleFillSymbolStyle.Solid,
            color = Color.fromRgba(255, 0, 0, 128),
            outline = blueOutlineSymbol
        )
    
        // Create a polygon graphic from the polygon geometry and symbol.
        Graphic(
            geometry = polygon,
            symbol = polygonFillSymbol
        )
    
    }
    
    Expand
  4. In MainScreen, display the graphic by adding it to the graphics property of graphicsOverlay.

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    @Composable
    fun MainScreen() {
        // create an ArcGISMap
        val map = remember {
            createMap()
        }
    
        // Create a graphics overlay.
        val graphicsOverlay = remember { GraphicsOverlay() }
    
        // Add the point graphic to the graphics overlay.
        graphicsOverlay.graphics.add(pointGraphic)
    
        // Add the polyline graphic to the graphics overlay.
        graphicsOverlay.graphics.add(polylineGraphic)
    
        // Add the polygon graphic to the graphics overlay.
        graphicsOverlay.graphics.add(polygonGraphic)
    
        // Create a list of graphics overlays used by the MapView
        val graphicsOverlays = remember { listOf(graphicsOverlay) }
    
    Expand

Click Run > Run > app to run the app.

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:

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