Trim or Extend

This sample demonstrates using the ArcGIS Runtime SDK for WPF to perform a geometry operation that takes an input polyline and a set of other polyline graphics and returns either a trimmed or extended set of polyline graphics. If the input polyline crosses another polyline graphic a trim will occur where the two cross. If the input polyline does not cross the other polyline but crosses an imaginary ray that extends out from the other polyline that and extend will occur.

To use this sample, digitize a line that crosses over or near the end of one or more blue lines. Trimmed or extended lines are returned in red.

XAML

<UserControl x:Class="ArcGISWPFSDK.LocalTrimExtend"
    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">
    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.Resources>
            <esri:SimpleLineSymbol x:Key="DefaultLineSymbol" Color="Blue" Width="8" />
            <esri:SimpleLineSymbol x:Key="DrawLineSymbol" Color="Yellow" Width="3" />
            <esri:SimpleLineSymbol x:Key="ResultsLineSymbol" Color="Red" Width="4" />
            <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="-15000000,2000000,-7000000,8000000" Background="#FFE3E3E3">
            <esri:Map.Layers>
                <esri:ArcGISLocalTiledLayer ID="BaseMap" Path="..\\Data\\TPKs\\Topographic.tpk"/>
                <esri:GraphicsLayer ID="PolylineGraphicsLayer" x:Name="_polylineGraphicsLayer">
                    <esri:GraphicsLayer.Graphics>
                        <esri:Graphic Symbol="{StaticResource DefaultLineSymbol}">
                            <esri:Polyline x:Name="Polyline_0">
                                <esri:Polyline.Paths>
                                    <esri:PointCollection>-13222659,6689903 -13222659,2649896</esri:PointCollection>
                                </esri:Polyline.Paths>
                            </esri:Polyline>
                        </esri:Graphic>
                        <esri:Graphic Symbol="{StaticResource DefaultLineSymbol}">
                            <esri:Polyline x:Name="Polyline_1">
                                <esri:Polyline.Paths>
                                    <esri:PointCollection>-12330709,6270162 -12330709,3741232</esri:PointCollection>
                                </esri:Polyline.Paths>
                            </esri:Polyline>
                        </esri:Graphic>
                        <esri:Graphic Symbol="{StaticResource DefaultLineSymbol}">
                            <esri:Polyline x:Name="Polyline_2">
                                <esri:Polyline.Paths>
                                    <esri:PointCollection>-11144941,6417071 -11144941,2807299</esri:PointCollection>
                                </esri:Polyline.Paths>
                            </esri:Polyline>
                        </esri:Graphic>
                        <esri:Graphic Symbol="{StaticResource DefaultLineSymbol}">
                            <esri:Polyline x:Name="Polygline_3">
                                <esri:Polyline.Paths>
                                    <esri:PointCollection>-9277094,5098527 -9277094,4024548</esri:PointCollection>
                                </esri:Polyline.Paths>
                            </esri:Polyline>
                        </esri:Graphic>
                    </esri:GraphicsLayer.Graphics>
                </esri:GraphicsLayer>

                <esri:GraphicsLayer ID="ResultsGraphicsLayer" x:Name="_resultsGraphicsLayer"/>
            </esri:Map.Layers>
        </esri:Map>

        <Grid HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0,15,15,0" >
            <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="Digitize a line that crosses over or near the end of one or more blue lines.  Trimmed or extended lines are returned in red." 
                       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 ESRI.ArcGIS.Client.Geometry;
using System.Collections.Generic;
using ESRI.ArcGIS.Client.Local;

namespace ArcGISWPFSDK
{
    public partial class LocalTrimExtend : UserControl
    {
        private Draw _drawObject;
        GeometryService _geometryTask;

        public LocalTrimExtend()
        {
            InitializeComponent();

            LocalGeometryService.GetServiceAsync(lgs =>
             {
                 _geometryTask = new GeometryService();
                 _geometryTask.Url = lgs.UrlGeometryService;
                 _geometryTask.TrimExtendCompleted += GeometryService_TrimExtendCompleted;
                 _geometryTask.Failed += GeometryService_Failed;
             });

            MyMap.Layers.LayersInitialized += (s, e) =>
            {
                _drawObject = new Draw(MyMap)
                {
                    DrawMode = DrawMode.Polyline,
                    IsEnabled = true,
                    LineSymbol = LayoutRoot.Resources["DrawLineSymbol"] as ESRI.ArcGIS.Client.Symbols.LineSymbol
                };
                _drawObject.DrawComplete += DrawObject_DrawComplete;

                foreach (Graphic g in _polylineGraphicsLayer.Graphics)
                    g.Geometry.SpatialReference = MyMap.SpatialReference;
            };
        }

        private void DrawObject_DrawComplete(object sender, DrawEventArgs args)
        {
            _drawObject.IsEnabled = false;

            _resultsGraphicsLayer.ClearGraphics();

            Polyline polyline = args.Geometry as Polyline;
            polyline.SpatialReference = MyMap.SpatialReference;

            List<Polyline> polylineList = new List<Polyline>();
            foreach (Graphic g in _polylineGraphicsLayer.Graphics)
                polylineList.Add(g.Geometry as Polyline);

            _geometryTask.TrimExtendAsync(polylineList, polyline, CurveExtension.DefaultCurveExtension);
        }

        void GeometryService_TrimExtendCompleted(object sender, GraphicsEventArgs e)
        {
            foreach (Graphic g in e.Results)
            {
                g.Symbol = LayoutRoot.Resources["ResultsLineSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol;
                _resultsGraphicsLayer.Graphics.Add(g);
            }

            _drawObject.IsEnabled = true;
        }

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

VB.NET

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

Namespace ArcGISWPFSDK
    Partial Public Class LocalTrimExtend
        Inherits UserControl
        Private MyDrawObject As Draw
        Private polylineLayer As GraphicsLayer
        Private resultsLayer As GraphicsLayer
        Private _geometryService As GeometryService

        Public Sub New()
            InitializeComponent()

            Dim localGeometryService As New LocalGeometryService()
            AddHandler localGeometryService.StartCompleted, Function(sender, eventargs)
                                                                Dim lgs As LocalGeometryService = TryCast(sender, LocalGeometryService)
                                                                _geometryService = New GeometryService()
                                                                _geometryService.Url = lgs.UrlGeometryService
                                                                AddHandler _geometryService.TrimExtendCompleted, AddressOf GeometryService_TrimExtendCompleted
                                                                AddHandler _geometryService.Failed, AddressOf GeometryService_Failed


                                                                MyDrawObject = New Draw(MyMap) With { _
                                                                 .DrawMode = DrawMode.Polyline, _
                                                                 .IsEnabled = True, _
                                                                 .LineSymbol = TryCast(LayoutRoot.Resources("DrawLineSymbol"), ESRI.ArcGIS.Client.Symbols.LineSymbol) _
                                                                }

                                                                AddHandler MyDrawObject.DrawComplete, AddressOf MyDrawObject_DrawComplete

                                                            End Function
            localGeometryService.StartAsync()

            polylineLayer = TryCast(MyMap.Layers("MyPolylineGraphicsLayer"), GraphicsLayer)
            resultsLayer = TryCast(MyMap.Layers("MyResultsGraphicsLayer"), GraphicsLayer)


            AddHandler MyMap.Layers.LayersInitialized, AddressOf Layers_LayersInitialized
        End Sub

        Private Sub Layers_LayersInitialized(sender As Object, args As EventArgs)
            For Each g As Graphic In polylineLayer.Graphics
                g.Geometry.SpatialReference = MyMap.SpatialReference
            Next
        End Sub

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

            resultsLayer.ClearGraphics()

            Dim polyline As Polyline = TryCast(args.Geometry, Polyline)
            polyline.SpatialReference = MyMap.SpatialReference



            Dim polylineList As New List(Of Polyline)()
            For Each g As Graphic In polylineLayer.Graphics
                polylineList.Add(TryCast(g.Geometry, Polyline))
            Next

            _geometryService.TrimExtendAsync(polylineList, polyline, CurveExtension.DefaultCurveExtension)
        End Sub

        Private Sub GeometryService_TrimExtendCompleted(sender As Object, e As GraphicsEventArgs)
            For Each g As Graphic In e.Results
                g.Symbol = TryCast(LayoutRoot.Resources("ResultsLineSymbol"), ESRI.ArcGIS.Client.Symbols.Symbol)
                resultsLayer.Graphics.Add(g)
            Next

            MyDrawObject.IsEnabled = True
        End Sub

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