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CompositeSymbol Class

Defines a set of symbols that make up a single symbol.
Inheritance Hierarchy
SystemObject
  Esri.ArcGISRuntime.SymbologySymbol
    Esri.ArcGISRuntime.SymbologyCompositeSymbol

Namespace:  Esri.ArcGISRuntime.Symbology
Assembly:  Esri.ArcGISRuntime (in Esri.ArcGISRuntime.dll) Version: 100.7.0.0
Syntax
public sealed class CompositeSymbol : Symbol

The CompositeSymbol type exposes the following members.

Constructors
Properties
  NameDescription
Public propertySymbols
Gets the symbols contained in the composite symbol.
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Methods
  NameDescription
Public methodClone
Clones this instance of Symbol and its members.
(Inherited from Symbol.)
Public methodCode exampleCreateSwatchAsync(Double)
Creates a swatch image of this symbol using the default size and a transparent background.
(Inherited from Symbol.)
Public methodCreateSwatchAsync(Color, Double)
Creates a swatch image of this symbol, using the default sizing and a transparent background.
(Inherited from Symbol.)
Public methodCreateSwatchAsync(Int32, Int32, Double, Color)
Creates a swatch image of this symbol, scaled to fit the specified dimensions.
(Inherited from Symbol.)
Public methodCreateSwatchAsync(Int32, Int32, Single, Color, Geometry)
Creates a swatch image of this symbol, with the specified image size, dpi, background color, and geometry.
(Inherited from Symbol.)
Public methodToJson
Returns the json representation of the symbol
(Inherited from Symbol.)
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Events
  NameDescription
Public eventPropertyChanged
Occurs when a property value changes.
(Inherited from Symbol.)
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Examples

WPF

Example Name: OfflineRouting

Solve a route on-the-fly using offline data.

Code example screen shot.

C#
// Copyright 2019 Esri.
// 
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using ArcGISRuntime.Samples.Managers;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.Tasks.NetworkAnalysis;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UI.Controls;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using Point = System.Windows.Point;

namespace ArcGISRuntime.WPF.Samples.OfflineRouting
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Offline routing",
        "Network Analysis",
        "Solve a route on-the-fly using offline data.",
        "")]
    [ArcGISRuntime.Samples.Shared.Attributes.OfflineData("567e14f3420d40c5a206e5c0284cf8fc")]
    public partial class OfflineRouting
    {
        // Graphics overlays for holding graphics.
        private GraphicsOverlay _stopsOverlay;
        private GraphicsOverlay _routeOverlay;

        // Route task and parameters.
        private RouteTask _offlineRouteTask;
        private RouteParameters _offlineRouteParameters;

        // List of travel modes, like 'Fastest' and 'Shortest'.
        private List<TravelMode> _availableTravelModes;

        // Track the graphic being interacted with.
        private Graphic _selectedStopGraphic;

        // The area covered by the geodatabase used for offline routing.
        private readonly Envelope _routableArea = new Envelope(new MapPoint(-13045352.223196, 3864910.900750, 0, SpatialReferences.WebMercator),
            new MapPoint(-13024588.857198, 3838880.505604, 0, SpatialReferences.WebMercator));

        public OfflineRouting()
        {
            InitializeComponent();
            Initialize();
        }

        private async void Initialize()
        {
            try
            {
                // Get the paths to resources used by the sample.
                string basemapTilePath = DataManager.GetDataFolder("567e14f3420d40c5a206e5c0284cf8fc", "streetmap_SD.tpk");
                string networkGeodatabasePath = DataManager.GetDataFolder("567e14f3420d40c5a206e5c0284cf8fc", "sandiego.geodatabase");

                // Create the tile cache representing the offline basemap.
                TileCache tiledBasemapCache = new TileCache(basemapTilePath);

                // Create a tiled layer to display the offline tiles.
                ArcGISTiledLayer offlineTiledLayer = new ArcGISTiledLayer(tiledBasemapCache);

                // Create a basemap based on the tile layer.
                Basemap offlineBasemap = new Basemap(offlineTiledLayer);

                // Create a new map with the offline basemap.
                Map theMap = new Map(offlineBasemap);

                // Set the initial viewpoint to show the routable area.
                theMap.InitialViewpoint = new Viewpoint(_routableArea);

                // Show the map in the map view.
                MyMapView.Map = theMap;

                // Create overlays for displaying the stops and the calculated route.
                _stopsOverlay = new GraphicsOverlay();
                _routeOverlay = new GraphicsOverlay();

                // Create a symbol and renderer for symbolizing the calculated route.
                SimpleLineSymbol routeSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Blue, 2);
                _routeOverlay.Renderer = new SimpleRenderer(routeSymbol);

                // Add the stops and route overlays to the map.
                MyMapView.GraphicsOverlays.Add(_stopsOverlay);
                MyMapView.GraphicsOverlays.Add(_routeOverlay);

                // Create the route task, referring to the offline geodatabase with the street network.
                _offlineRouteTask = await RouteTask.CreateAsync(networkGeodatabasePath, "Streets_ND");

                // Get the list of available travel modes.
                _availableTravelModes = _offlineRouteTask.RouteTaskInfo.TravelModes.ToList();

                // Update the UI with the travel modes list.
                TravelModesCombo.ItemsSource = _availableTravelModes;
                TravelModesCombo.SelectedIndex = 0;

                // Create the default parameters.
                _offlineRouteParameters = await _offlineRouteTask.CreateDefaultParametersAsync();

                // Display the extent of the road network on the map.
                DisplayBoundaryMarker();

                // Now that the sample is ready, hook up the tapped and hover events.
                MyMapView.GeoViewTapped += MapView_Tapped;
                MyMapView.MouseMove += MapView_MouseMoved;
                TravelModesCombo.SelectionChanged += TravelMode_SelectionChanged;
            }
            catch (Exception e)
            {
                Debug.WriteLine(e);
                ShowMessage("Couldn't start sample", "There was a problem starting the sample. See debug output for details.");
            }
        }

        private void DisplayBoundaryMarker()
        {
            // Displaying the boundary marker helps avoid choosing a non-routable destination.
            SimpleLineSymbol boundarySymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Color.LawnGreen, 5);
            Graphic boundary = new Graphic(_routableArea, boundarySymbol);
            GraphicsOverlay boundaryOverlay = new GraphicsOverlay();
            boundaryOverlay.Graphics.Add(boundary);
            MyMapView.GraphicsOverlays.Add(boundaryOverlay);
        }

        private void ResetRoute()
        {
            _routeOverlay.Graphics.Clear();
            _stopsOverlay.Graphics.Clear();

            // Reset the error message.
            ErrorTextBlock.Text = "";
        }

        private async void UpdateRoute(TravelMode selectedTravelMode)
        {
            try
            {
                // Create a list of stops.
                List<Stop> stops = new List<Stop>();

                // Add a stop to the list for each graphic in the stops overlay.
                foreach (Graphic stopGraphic in _stopsOverlay.Graphics)
                {
                    Stop stop = new Stop((MapPoint) stopGraphic.Geometry);
                    stops.Add(stop);
                }

                if (stops.Count < 2)
                {
                    // Don't route, there's no where to go (and the route task would throw an exception).
                    return;
                }

                // Configure the route parameters with the list of stops.
                _offlineRouteParameters.SetStops(stops);

                // Configure the travel mode.
                _offlineRouteParameters.TravelMode = selectedTravelMode;

                // Solve the route.
                RouteResult offlineRouteResult = await _offlineRouteTask.SolveRouteAsync(_offlineRouteParameters);

                // Clear the old route result.
                _routeOverlay.Graphics.Clear();

                // Get the geometry from the route result.
                Polyline routeGeometry = offlineRouteResult.Routes.First().RouteGeometry;

                // Note: symbology left out here because the symbology was set once on the graphics overlay.
                Graphic routeGraphic = new Graphic(routeGeometry);

                // Display the route.
                _routeOverlay.Graphics.Add(routeGraphic);
            }
            catch (Exception e)
            {
                Debug.WriteLine(e);
                ShowMessage("Couldn't update route", "There was an error updating the route. See debug output for details.");
                _selectedStopGraphic = null;
            }
        }

        private async void AddStop(Point tappedPosition)
        {
            try
            {
                // Get the location on the map.
                MapPoint tappedLocation = MyMapView.ScreenToLocation(tappedPosition);

                // Name the stop by its number.
                string stopName = $"{_stopsOverlay.Graphics.Count + 1}";

                // Create a pushpin marker for the stop.
                PictureMarkerSymbol pushpinMarker = await GetPictureMarker();

                // Create the text symbol for labeling the stop.
                TextSymbol stopSymbol = new TextSymbol(stopName, Color.White, 15,
                    Esri.ArcGISRuntime.Symbology.HorizontalAlignment.Center, Esri.ArcGISRuntime.Symbology.VerticalAlignment.Middle);
                stopSymbol.OffsetY = 15;

                // Create a combined symbol with the pushpin and the label.
                CompositeSymbol combinedSymbol = new CompositeSymbol(new MarkerSymbol[] {pushpinMarker, stopSymbol});

                // Create the graphic from the geometry and the symbology.
                Graphic newStopGraphic = new Graphic(tappedLocation, combinedSymbol);

                // Update the selection.
                _selectedStopGraphic = newStopGraphic;

                // Add the stop to the overlay.
                _stopsOverlay.Graphics.Add(newStopGraphic);
            }
            catch (Exception e)
            {
                Debug.WriteLine(e);
                ShowMessage("Couldn't add stop", "Couldn't select or add stop. See debug output for details.");
            }
        }

        private async Task<PictureMarkerSymbol> GetPictureMarker()
        {
            // Get current assembly that contains the image.
            Assembly currentAssembly = Assembly.GetExecutingAssembly();

            // Get image as a stream from the resources.
            // Picture is defined as EmbeddedResource and DoNotCopy.
            Stream resourceStream = currentAssembly.GetManifestResourceStream(
                "ArcGISRuntime.Resources.PictureMarkerSymbols.pin_blue.png");

            // Create new symbol using asynchronous factory method from stream.
            PictureMarkerSymbol pinSymbol = await PictureMarkerSymbol.CreateAsync(resourceStream);
            pinSymbol.Width = 50;
            pinSymbol.Height = 50;
            pinSymbol.LeaderOffsetX = 30;
            pinSymbol.OffsetY = 14;

            return pinSymbol;
        }

        private void ResetButton_Click(object sender, RoutedEventArgs e) => ResetRoute();

        private void MapView_Tapped(object sender, GeoViewInputEventArgs e)
        {
            // Reset the error message.
            ErrorTextBlock.Text = "";

            // Make sure the stop is valid before proceeding.
            if (!GeometryEngine.Contains(_routableArea, e.Location))
            {
                ShowMessage("Can't add stop.", "That location is outside of the area where offline routing data is available.");
                return;
            }

            if (_selectedStopGraphic == null && _stopsOverlay.Graphics.Count < 5)
            {
                // Select or add a stop.
                AddStop(e.Position);
            }
            else if (_selectedStopGraphic == null)
            {
                ShowMessage("Can't add stop.", "Sample limits to 5 stops per route.");
            }
            else
            {
                // Finish updating the geometry.
                _selectedStopGraphic.Geometry = e.Location;

                // Reset the selected graphic.
                _selectedStopGraphic = null;

                // Update the route with the final list of stops.
                UpdateRoute((TravelMode)TravelModesCombo.SelectedItem);
            }
        }

        private void MapView_MouseMoved(object sender, MouseEventArgs e)
        {
            if (_selectedStopGraphic != null)
            {
                // Get the position of the mouse relative to the map view.
                Point hoverPoint = e.GetPosition(MyMapView);

                // Get the physical map location corresponding to the mouse position.
                MapPoint hoverLocation = MyMapView.ScreenToLocation(hoverPoint);

                // Return if the location is outside the routable area.
                if (!GeometryEngine.Contains(_routableArea, hoverLocation))
                {
                    return;
                }

                // Update the location of the stop graphic.
                _selectedStopGraphic.Geometry = hoverLocation;

                // Update the route with the temporary stop.
                UpdateRoute((TravelMode) TravelModesCombo.SelectedItem ?? _availableTravelModes.First());
            }
        }

        private void TravelMode_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            try
            {
                if (TravelModesCombo.SelectedItem == null)
                {
                    TravelModesCombo.SelectedItem = _availableTravelModes.First();
                }

                UpdateRoute((TravelMode) TravelModesCombo.SelectedItem);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex);
                ShowMessage("Couldn't change travel mode", "Couldn't change travel mode. See debug output for details.");
            }
        }

        private void ShowMessage(string title, string detail)
        {
            ErrorTextBlock.Text = detail;
            Debug.WriteLine(title);
        }
    }
}
XAML
<UserControl x:Class="ArcGISRuntime.WPF.Samples.OfflineRouting.OfflineRouting"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:esri="http://schemas.esri.com/arcgis/runtime/2013">
    <Grid>
        <esri:MapView x:Name="MyMapView" />
        <Border Style="{StaticResource BorderStyle}">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                <TextBlock
                    Text="Click the map to add up to 5 stops. Click again to finish placing it. Route lines will be displayed on-the-fly."
                    Grid.Row="0" Grid.Column="0"
                    FontWeight="SemiBold" TextWrapping="Wrap" />
                <ComboBox x:Name="TravelModesCombo"
                          Grid.Row="1"
                          Margin="0,5,0,5">
                    <ComboBox.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Name}" />
                        </DataTemplate>
                    </ComboBox.ItemTemplate>
                </ComboBox>
                <Button Content="Reset"
                        Grid.Row="2"
                        Click="ResetButton_Click" />
                <TextBlock x:Name="ErrorTextBlock"
                           Grid.Row="3"
                           TextWrapping="Wrap"
                           Foreground="Red" />
            </Grid>
        </Border>
    </Grid>
</UserControl>
See Also
Additional Examples
Hyperlink to ExampleDescription
OfflineRoutingSolve a route on-the-fly using offline data.
RouteAroundBarriersFind a route that reaches all stops without crossing any barriers.