S57 Identify

This sample shows how to perform a point-based identify style operation on an HydrographicS57Layer using the HitTestAsync method. Note that HitTest operations take screen coordinates as opposed other query/search operations which typically take a spatial geometry object.

XAML

<UserControl x:Class="ArcGISWPFSDK.S57Identify"
             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/client/2009"
             xmlns:local="clr-namespace:ArcGISWPFSDK">
    <Grid>
        <Grid.Resources>
            <Style TargetType="ListBoxItem">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="ListBoxItem">
                            <Border x:Name="ItemBorder"
                                    BorderBrush="Black"
                                    Background="LightGray"
                                    BorderThickness="2"         
                                    Margin="3">
                                <ContentPresenter Margin="2" />
                            </Border>
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsMouseOver" Value="True">
                                    <Setter TargetName="ItemBorder"
                                            Property="BorderBrush"
                                            Value="Blue" />
                                </Trigger>
                                <Trigger Property="IsSelected" Value="True">
                                    <Setter TargetName="ItemBorder"
                                            Property="BorderBrush"
                                            Value="Red"/>
                                </Trigger>
                                <MultiTrigger>
                                    <MultiTrigger.Conditions>
                                        <Condition Property="IsMouseOver" Value="False" />
                                        <Condition Property="IsSelected" Value="False" />
                                    </MultiTrigger.Conditions>
                                    <Setter TargetName="ItemBorder"
                                            Property="Opacity"
                                            Value="0.50" />
                                </MultiTrigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
           
        </Grid.Resources>
        <Grid>

            <esri:Map x:Name="MyMap"  UseAcceleratedDisplay="True" Extent="-15090086, 4141039, -13113925 , 5862778"
                     WrapAround="True" MinimumResolution="5">

                <esri:ArcGISTiledMapServiceLayer ID="Ocean_BaseMap"
                        Url="http://services.arcgisonline.com/ArcGIS/rest/services/Ocean_Basemap/MapServer" />

                <esri:HydrographicS57Layer x:Name="S57Layer"  ID="S57" Initialized="S57Layer_Initialized">
                    <esri:S57Cell Path="..\Data\s57_electronic_navigational_charts\US1WC01M\US1WC01M.000" />
                    <esri:S57Cell Path="..\Data\s57_electronic_navigational_charts\US1WC07M\US1WC07M.000" />
                </esri:HydrographicS57Layer>

                <esri:GraphicsLayer x:Name="_identifyResults" ID="Identify Results" Opacity="0.5"  />

            </esri:Map>

            <Grid Width="300" Height="550" Margin="5,5,0,0" VerticalAlignment="Top" HorizontalAlignment="Left">
                <Grid.Resources>
                    <DataTemplate x:Key="identifyResults">
                        <StackPanel Orientation="Vertical" Margin="5,5">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="Acronym: " />
                                <TextBlock Text="{Binding Path=Acronym}" />
                            </StackPanel>
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="Long Name: " />
                                <TextBlock Text="{Binding Path=LongName}"/>
                            </StackPanel>
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="Cell Name: " />
                                <TextBlock Text="{Binding Path=CellName}"/>
                            </StackPanel>
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="Composition Scale: " />
                                <TextBlock Text="{Binding Path=CompositionScale}"/>
                            </StackPanel>
                        </StackPanel>
                    </DataTemplate>
                </Grid.Resources>

                <Rectangle Height="550" Grid.RowSpan="6" VerticalAlignment="Top" Fill="White" Stroke="Gray" >
                    <Rectangle.Effect>
                        <DropShadowEffect/>
                    </Rectangle.Effect>
                </Rectangle>
                <Rectangle Grid.RowSpan="6" Margin="5" Fill="#DDFFFFFF" Stroke="DarkGray" />

                <StackPanel>
                    <TextBlock Margin="10,10,5,0">Click on the map to perform an Identify operation.</TextBlock>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Margin="10,5,5,0">Found:</TextBlock>
                        <TextBlock Margin="5,5,5,0" x:Name="IdentifyResultsText"/>
                    </StackPanel>
                    <ListBox x:Name="ResultItems" ItemTemplate="{StaticResource identifyResults}" 
                             SelectionChanged="ResultItems_SelectionChanged" Width="280" Height="350"
                             HorizontalContentAlignment="Stretch" Margin="10,5,10,10" />
                    <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"  
                         Width="280" Height="125">
                        <DataGrid x:Name="ResultAttributes"  AutoGenerateColumns="True" HeadersVisibility="All" 
                              Background="White">
                        </DataGrid>
                    </ScrollViewer>

                </StackPanel>
            </Grid>

        </Grid>
    </Grid>
</UserControl>

C#

using System;
using System.Windows.Controls;
using ESRI.ArcGIS.Client.AdvancedSymbology;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Geometry;
using ESRI.ArcGIS.Client.Symbols;
using System.Windows.Data;
using System.Collections.Generic;

namespace ArcGISWPFSDK
{
    public partial class S57Identify : UserControl
    {
        public S57Identify()
        {
            InitializeComponent();
        }

        // Handle the MouseClick event on the Map
        private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)
        {           
            // Call the HitTestAsync method passing in the screenpoint, the maximum number of results, a callback delegate, and pixel tolerance
            S57Layer.HitTestAsync(e.ScreenPoint, 10,(results) =>
            {                
                // Set the ItemSource property of the ListBox to the returned IList<S57FeatureObject> result set
                ResultItems.ItemsSource = results;

                // Convert the MapPoint from the MouseEventArgs to a formatted string in the Decimal Degree notation
                var locString = CoordinateConversion.MapPointToDecimalDegrees(e.MapPoint, 3);

                // Set the Identify results text
                IdentifyResultsText.Text = string.Format("{1} item{2} at {0}", locString, results.Count, results.Count > 1 ? "s" : "");
            },3);
        }

        // Handle the ListBox item selection changed event
        private void ResultItems_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Get the selected ListBoxItem and cast to S57FeatureObject
            var item = ResultItems.SelectedItem as S57FeatureObject;

            // Clear the results graphics
            _identifyResults.Graphics.Clear();
            
            // Generate a graphic with appropriate symbology from the S57FeatureObject geometry
            if (item != null)
                _identifyResults.Graphics.Add(MakeGraphicFromGeom(item.Geometry));

            // Display the attributes in the attributes DataGrid.
            int index = ResultItems.SelectedIndex;
            if (index > -1)
            {
                /*
                 * Note:- S57FeatureObject.Attributes property has been deprecated. Instead use S57FeatureObject.AttributeItems.
                 */
                //ResultAttributes.ItemsSource = item.Attributes;
                ResultAttributes.ItemsSource = item.AttributeItems;
            }
            else
                ResultAttributes.ItemsSource = null;
        }
        
        // Utility function to generate a graphic, with symbol, from a Geometry object.
        private Graphic MakeGraphicFromGeom(ESRI.ArcGIS.Client.Geometry.Geometry geom)
        {
            if (geom == null)
                return null;
            Graphic graphic = new Graphic();
            graphic.Geometry = geom;

            // Check geometry type and create appropriate Simple...Symbol.
            if (geom is MapPoint || geom is MultiPoint)
                graphic.Symbol = new SimpleMarkerSymbol() { Color = System.Windows.Media.Brushes.Red, Size = 20 };
            else if (geom is ESRI.ArcGIS.Client.Geometry.Polyline)
                graphic.Symbol = new SimpleLineSymbol() { Color = System.Windows.Media.Brushes.Red, Width = 6 };
            else if (geom is ESRI.ArcGIS.Client.Geometry.Polygon || geom is Envelope)
                graphic.Symbol = new SimpleFillSymbol() { Fill = System.Windows.Media.Brushes.Red };
            return graphic;
        }

        // Event fired when the 
        private void S57Layer_Initialized(object sender, EventArgs e)
        {
            // Check if an error was encountered on initialization.
            if (S57Layer.InitializationFailure != null)
                return;

            // Register the Map MouseClick when the layer has initialized.
            MyMap.MouseClick += MyMap_MouseClick;
        }
    }
}

VB.NET

Imports System.Windows.Controls
Imports ESRI.ArcGIS.Client.AdvancedSymbology
Imports ESRI.ArcGIS.Client
Imports ESRI.ArcGIS.Client.Geometry
Imports ESRI.ArcGIS.Client.Symbols

Namespace ArcGISWPFSDK
    Partial Public Class S57Identify
        Inherits UserControl
        Public Sub New()
            InitializeComponent()
        End Sub

        ' Handle the MouseClick event on the Map
        Private Sub MyMap_MouseClick(sender As Object, e As ESRI.ArcGIS.Client.Map.MouseEventArgs)
            ' Call the HitTestAsync method passing in the screenpoint, the maximum number of results, a callback delegate, and pixel tolerance
            S57Layer.HitTestAsync(e.ScreenPoint, 10, _
                                  Function(results)
                                    
                                      ' Set the ItemSource property of the ListBox to the returned IList<S57FeatureObject> result set
                                      ResultItems.ItemsSource = results

                                      ' Convert the MapPoint from the MouseEventArgs to a formatted string in the Decimal Degree notation
                                      Dim locString = CoordinateConversion.MapPointToDecimalDegrees(e.MapPoint, 3)

                                      ' Set the Identify results text
                                      IdentifyResultsText.Text = String.Format("{1} item{2} at {0}", locString, results.Count, If(results.Count > 1, "s", ""))

                                  End Function, 3)
        End Sub

        ' Handle the ListBox item selection changed event
        Private Sub ResultItems_SelectionChanged(sender As Object, e As SelectionChangedEventArgs)
            ' Get the selected ListBoxItem and cast to S57FeatureObject
            Dim item = TryCast(ResultItems.SelectedItem, S57FeatureObject)

            ' Clear the results graphics
            _identifyResults.Graphics.Clear()

            ' Generate a graphic with appropriate symbology from the S57FeatureObject geometry
            If item IsNot Nothing Then
                _identifyResults.Graphics.Add(MakeGraphicFromGeom(item.Geometry))
            End If

            ' Display the attributes in the attributes DataGrid.
            Dim index As Integer = ResultItems.SelectedIndex
            If index > -1 Then
                ResultAttributes.ItemsSource = item.Attributes
            Else
                ResultAttributes.ItemsSource = Nothing
            End If
        End Sub

        ' Utility function to generate a graphic, with symbol, from a Geometry object.
        Private Function MakeGraphicFromGeom(geom As ESRI.ArcGIS.Client.Geometry.Geometry) As Graphic
            If geom Is Nothing Then
                Return Nothing
            End If
            Dim graphic As New Graphic()
            graphic.Geometry = geom

            ' Check geometry type and create appropriate Simple...Symbol.
            If TypeOf geom Is MapPoint OrElse TypeOf geom Is MultiPoint Then
                graphic.Symbol = New SimpleMarkerSymbol() With { _
                    .Color = System.Windows.Media.Brushes.Red, _
                    .Size = 20 _
                }
            ElseIf TypeOf geom Is ESRI.ArcGIS.Client.Geometry.Polyline Then
                graphic.Symbol = New SimpleLineSymbol() With { _
                    .Color = System.Windows.Media.Brushes.Red, _
                    .Width = 6 _
                }
            ElseIf TypeOf geom Is ESRI.ArcGIS.Client.Geometry.Polygon OrElse TypeOf geom Is Envelope Then
                graphic.Symbol = New SimpleFillSymbol() With { _
                    .Fill = System.Windows.Media.Brushes.Red _
                }
            End If
            Return graphic
        End Function

        ' Event fired when the 
        Private Sub S57Layer_Initialized(sender As Object, e As EventArgs)
            ' Check if an error was encountered on initialization.
            If S57Layer.InitializationFailure IsNot Nothing Then
                Return
            End If

            ' Register the Map MouseClick when the layer has initialized.
            AddHandler MyMap.MouseClick, AddressOf MyMap_MouseClick
        End Sub
    End Class
End Namespace