Reshape Online

This sample demonstrates using an ESRI.ArcGIS.Client.Tasks GeometryService that takes an input polyline graphic that cuts across a polygon graphic to generate a new polygon graphics that is reshaped to be smaller by the cutting polyline. To make this sample work requires a two step interaction of first selection and existing polygon via a mouse click and then drawing a polyline across the selected polygon. The Draw_Complete event in the code-behind uses If/Else logic to determine if the user is in the first step or the second step via the an ESRI.ArcGIS.Client Draw object to determine what drawing mode (Point, Polyline, Polygon, etc.) is being used.

To use the sample, (step 1) click to select a parcel polygon and (step 2) digitize a line that intersects the selected polygon. The start and/or end point of the line can be inside the polygon.

XAML

<UserControl x:Class="ArcGISWPFSDK.Reshape"
    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:sys="clr-namespace:System;assembly=mscorlib">
    <Grid x:Name="LayoutRoot">

        <Grid.Resources>
            <esri:SimpleLineSymbol x:Key="RedLineSymbol" Color="Red" Width="4" Style="Solid" />
            <esri:FillSymbol x:Key="BlueFillSymbol">
                <esri:FillSymbol.ControlTemplate>
                    <ControlTemplate x:Name="CustomPolygonTemplate">
                        <Grid>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualState x:Name="Normal" />
                                    <VisualState x:Name="Selected">
                                        <Storyboard>
                                            <ColorAnimationUsingKeyFrames BeginTime="0" Duration="0" 
                                                                          Storyboard.TargetName="Element" 
                                                                          Storyboard.TargetProperty="(Fill).(Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#6600FFFF"/>
                                            </ColorAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <Path x:Name="Element" Stroke="Red" Fill="#660000FF"
                                StrokeStartLineCap="Round" StrokeThickness="2" 
                                StrokeLineJoin="Round" StrokeEndLineCap="Round" />
                        </Grid>
                    </ControlTemplate>
                </esri:FillSymbol.ControlTemplate>
            </esri:FillSymbol>
            <sys:String x:Key="StartText">Click to select a parcel polygon.</sys:String>
            <sys:String x:Key="EndText">Digitize a line that intersects the selected polygon.  The start and/or end point of the line can be inside the polygon.</sys:String>
            <LinearGradientBrush x:Key="PanelGradient" EndPoint="0.5,1" StartPoint="0.5,0">
                <LinearGradientBrush.RelativeTransform>
                    <TransformGroup>
                        <ScaleTransform CenterY="0.5" CenterX="0.5"/>
                        <SkewTransform CenterY="0.5" CenterX="0.5"/>
                        <RotateTransform Angle="176" CenterY="0.5" CenterX="0.5"/>
                        <TranslateTransform/>
                    </TransformGroup>
                </LinearGradientBrush.RelativeTransform>
                <GradientStop Color="#FF145787" Offset="0.16"/>
                <GradientStop Color="#FF3D7FAC" Offset="0.502"/>
                <GradientStop Color="#FF88C5EF" Offset="0.984"/>
            </LinearGradientBrush>
        </Grid.Resources>

        <esri:Map x:Name="MyMap" Extent="-83.3188395774275,42.61428312652851,-83.31295664068958,42.61670913269855" >
            <esri:ArcGISTiledMapServiceLayer ID="StreetMapLayer" 
                Url="http://services.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer" />
            <esri:GraphicsLayer ID="ParcelsGraphicsLayer" />
        </esri:Map>

        <Grid HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,10,10,0" >
            <Rectangle Fill="{StaticResource PanelGradient}" Stroke="Gray"  RadiusX="10" RadiusY="10" Margin="0,0,0,5" >
                <Rectangle.Effect>
                    <DropShadowEffect/>
                </Rectangle.Effect>
            </Rectangle>
            <Rectangle Fill="#FFFFFFFF" Stroke="DarkGray" RadiusX="5" RadiusY="5" Margin="10,10,10,15" />
            <TextBlock x:Name="InfoTextBlock" Text="{StaticResource StartText}" 
                       Width="200" TextAlignment="Left" Margin="30,20,20,30" TextWrapping="Wrap" Foreground="Black" />
        </Grid>

    </Grid>
</UserControl>

C#

using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using ESRI.ArcGIS.Client;
using ESRI.ArcGIS.Client.Tasks;
using System.Collections.Generic;
using System.Windows.Media;

namespace ArcGISWPFSDK
{
    public partial class Reshape : UserControl
    {
        private Draw MyDrawObject;
        private GraphicsLayer parcelGraphicsLayer;
        private Graphic selectedGraphic;

        public Reshape()
        {
            InitializeComponent();

            MyMap.Layers.LayersInitialized += Layers_LayersInitialized;

            MyMap.MinimumResolution = double.Epsilon;

            MyDrawObject = new Draw(MyMap)
            {
                DrawMode = DrawMode.Point,
                LineSymbol = LayoutRoot.Resources["RedLineSymbol"] as ESRI.ArcGIS.Client.Symbols.LineSymbol,
                IsEnabled = false
            };
            MyDrawObject.DrawComplete += MyDrawObject_DrawComplete;

            parcelGraphicsLayer = MyMap.Layers["ParcelsGraphicsLayer"] as GraphicsLayer;
        }

        void Layers_LayersInitialized(object sender, EventArgs args)
        {
            if (parcelGraphicsLayer != null && parcelGraphicsLayer.Graphics.Count == 0)
            {
                QueryTask queryTask =
                    new QueryTask("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/TaxParcel/AssessorsParcelCharacteristics/MapServer/1");
                Query query = new Query();
                query.Geometry = MyMap.Extent;
                query.ReturnGeometry = true;
                queryTask.ExecuteCompleted += queryTask_ExecuteCompleted;
                queryTask.Failed += queryTask_Failed;
                queryTask.ExecuteAsync(query);
            }
        }

        void queryTask_Failed(object sender, TaskFailedEventArgs e)
        {
            MessageBox.Show("Query error: " + e.Error);
        }

        void queryTask_ExecuteCompleted(object sender, QueryEventArgs e)
        {
            foreach (Graphic g in e.FeatureSet.Features)
            {
                g.Symbol = LayoutRoot.Resources["BlueFillSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol;
                g.Geometry.SpatialReference = MyMap.SpatialReference;
                parcelGraphicsLayer.Graphics.Add(g);
            }
            MyDrawObject.IsEnabled = true;
        }

        private void MyDrawObject_DrawComplete(object sender, DrawEventArgs args)
        {
            MyDrawObject.IsEnabled = false;

            if (MyDrawObject.DrawMode == DrawMode.Point)
            {
                ESRI.ArcGIS.Client.Geometry.MapPoint point = args.Geometry as ESRI.ArcGIS.Client.Geometry.MapPoint;
                point.SpatialReference = MyMap.SpatialReference;
                System.Windows.Point screenPnt = MyMap.MapToScreen(point);

                // Account for difference between Map and application origin
                GeneralTransform generalTransform = MyMap.TransformToVisual(Application.Current.MainWindow);
                System.Windows.Point transformScreenPnt = generalTransform.Transform(screenPnt);

                IEnumerable<Graphic> selected =
                    parcelGraphicsLayer.FindGraphicsInHostCoordinates(transformScreenPnt);

                if (selected.ToArray().Length <= 0)
                {
                    MyDrawObject.IsEnabled = true;
                    return;
                }

                selectedGraphic = selected.ToList()[0] as Graphic;

                selectedGraphic.Select();

                MyDrawObject.DrawMode = DrawMode.Polyline;
                MyDrawObject.IsEnabled = true;

                InfoTextBlock.Text = LayoutRoot.Resources["EndText"] as string;
            }
            else
            {
                ESRI.ArcGIS.Client.Geometry.Polyline polyline = args.Geometry as ESRI.ArcGIS.Client.Geometry.Polyline;
                polyline.SpatialReference = MyMap.SpatialReference;

                GeometryService geometryService =
                  new GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");

                geometryService.ReshapeCompleted += GeometryService_ReshapeCompleted;
                geometryService.Failed += GeometryService_Failed;

                // Should use one of the other geometry operations, such as RelationAsync, prior to calling ReshapeAsync to ensure that the user defined polyline actually 
                // does intersect the selected polygon. For simplicity here we assume that it always does.
                geometryService.ReshapeAsync(selectedGraphic.Geometry, polyline);
            }
        }

        void GeometryService_ReshapeCompleted(object sender, GeometryEventArgs e)
        {
            parcelGraphicsLayer.Graphics.Remove(selectedGraphic);

            Graphic graphic = new Graphic()
            {
                Symbol = LayoutRoot.Resources["BlueFillSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol,
                Geometry = e.Result
            };

            parcelGraphicsLayer.Graphics.Add(graphic);

            MyDrawObject.DrawMode = DrawMode.Point;
            MyDrawObject.IsEnabled = true;
            InfoTextBlock.Text = LayoutRoot.Resources["StartText"] as string;
        }

        private void GeometryService_Failed(object sender, TaskFailedEventArgs e)
        {
            MessageBox.Show("Geometry Service error: " + e.Error);
        }
    }
}

VB.NET

Imports System.Linq
Imports System.Windows
Imports System.Windows.Controls
Imports ESRI.ArcGIS.Client
Imports ESRI.ArcGIS.Client.Tasks
Imports System.Collections.Generic
Imports System.Windows.Media

Namespace ArcGISWPFSDK
    Partial Public Class Reshape
        Inherits UserControl
        Private MyDrawObject As Draw
        Private parcelGraphicsLayer As GraphicsLayer
        Private selectedGraphic As Graphic

        Public Sub New()
            InitializeComponent()

            AddHandler MyMap.Layers.LayersInitialized, AddressOf Layers_LayersInitialized

            MyMap.MinimumResolution = Double.Epsilon

            MyDrawObject = New Draw(MyMap) With { _
             .DrawMode = DrawMode.Point, _
             .LineSymbol = TryCast(LayoutRoot.Resources("RedLineSymbol"), ESRI.ArcGIS.Client.Symbols.LineSymbol), _
             .IsEnabled = False _
            }
            AddHandler MyDrawObject.DrawComplete, AddressOf MyDrawObject_DrawComplete

            parcelGraphicsLayer = TryCast(MyMap.Layers("ParcelsGraphicsLayer"), GraphicsLayer)
        End Sub

        Private Sub Layers_LayersInitialized(sender As Object, args As EventArgs)
            If parcelGraphicsLayer IsNot Nothing AndAlso parcelGraphicsLayer.Graphics.Count = 0 Then
                Dim queryTask As New QueryTask("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/TaxParcel/AssessorsParcelCharacteristics/MapServer/1")
                Dim query As New Query()
                query.Geometry = MyMap.Extent
                query.ReturnGeometry = True
                AddHandler queryTask.ExecuteCompleted, AddressOf queryTask_ExecuteCompleted
                AddHandler queryTask.Failed, AddressOf queryTask_Failed
                queryTask.ExecuteAsync(query)
            End If
        End Sub

        Private Sub queryTask_Failed(sender As Object, e As TaskFailedEventArgs)
            MessageBox.Show("Query error: " & Convert.ToString(e.[Error]))
        End Sub

        Private Sub queryTask_ExecuteCompleted(sender As Object, e As QueryEventArgs)
            For Each g As Graphic In e.FeatureSet.Features
                g.Symbol = TryCast(LayoutRoot.Resources("BlueFillSymbol"), ESRI.ArcGIS.Client.Symbols.Symbol)
                g.Geometry.SpatialReference = MyMap.SpatialReference
                parcelGraphicsLayer.Graphics.Add(g)
            Next
            MyDrawObject.IsEnabled = True
        End Sub

        Private Sub MyDrawObject_DrawComplete(sender As Object, args As DrawEventArgs)
            MyDrawObject.IsEnabled = False

            If MyDrawObject.DrawMode = DrawMode.Point Then
                Dim point As ESRI.ArcGIS.Client.Geometry.MapPoint = TryCast(args.Geometry, ESRI.ArcGIS.Client.Geometry.MapPoint)
                point.SpatialReference = MyMap.SpatialReference
                Dim screenPnt As System.Windows.Point = MyMap.MapToScreen(point)

                ' Account for difference between Map and application origin
                Dim generalTransform As GeneralTransform = MyMap.TransformToVisual(Application.Current.MainWindow)
                Dim transformScreenPnt As System.Windows.Point = generalTransform.Transform(screenPnt)

                Dim selected As IEnumerable(Of Graphic) = parcelGraphicsLayer.FindGraphicsInHostCoordinates(transformScreenPnt)

                If selected.ToArray().Length <= 0 Then
                    MyDrawObject.IsEnabled = True
                    Return
                End If

                selectedGraphic = TryCast(selected.ToList()(0), Graphic)

                selectedGraphic.[Select]()

                MyDrawObject.DrawMode = DrawMode.Polyline
                MyDrawObject.IsEnabled = True

                InfoTextBlock.Text = TryCast(LayoutRoot.Resources("EndText"), String)
            Else
                Dim polyline As ESRI.ArcGIS.Client.Geometry.Polyline = TryCast(args.Geometry, ESRI.ArcGIS.Client.Geometry.Polyline)
                polyline.SpatialReference = MyMap.SpatialReference

                Dim geometryService As New GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer")

                AddHandler geometryService.ReshapeCompleted, AddressOf GeometryService_ReshapeCompleted
                AddHandler geometryService.Failed, AddressOf GeometryService_Failed

                ' Should use one of the other geometry operations, such as RelationAsync, prior to calling ReshapeAsync to ensure that the user defined polyline actually 
                ' does intersect the selected polygon. For simplicity here we assume that it always does.
                geometryService.ReshapeAsync(selectedGraphic.Geometry, polyline)
            End If
        End Sub

        Private Sub GeometryService_ReshapeCompleted(sender As Object, e As GeometryEventArgs)
            parcelGraphicsLayer.Graphics.Remove(selectedGraphic)

            Dim graphic As New Graphic() With { _
             .Symbol = TryCast(LayoutRoot.Resources("BlueFillSymbol"), ESRI.ArcGIS.Client.Symbols.Symbol), _
             .Geometry = e.Result _
            }

            parcelGraphicsLayer.Graphics.Add(graphic)

            MyDrawObject.DrawMode = DrawMode.Point
            MyDrawObject.IsEnabled = True
            InfoTextBlock.Text = TryCast(LayoutRoot.Resources("StartText"), String)
        End Sub

        Private Sub GeometryService_Failed(sender As Object, e As TaskFailedEventArgs)
            MessageBox.Show("Geometry Service error: " & Convert.ToString(e.[Error]))
        End Sub
    End Class
End Namespace