How to get the length of a Polyline

Permanently deleted user

5. Februar 2014 04:47

One of the sample workflows (Routing workflow with geocoding) on the Geocortex site creates "Routes" based on "stops" the user establishes.  This workflow works great but I'd like to know the total distance for a route.  How can I get the distance from a ESRI.ArcGIS.Client.Geometry.Polyline?  I assume thats the best place to get the distance

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  Permanently deleted user

  5. Februar 2014 05:19

  Hi Josh

  if you have managed to get a Geometry.Polyline then you can feed that to the ArcGIS Server - Areas and Lengths Task.

  Regards

  Ralph

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  Permanently deleted user

  5. Februar 2014 05:29

  Hi Ralph,

   

  Thanks for the quick reply and forgive my ignorance on the matter but how would I accomplish that in a workflow?  Are there some basic steps to calling the geometry service, supplying this polyline parameter, and getting an output?  Thanks Ralph.

   

   

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  Permanently deleted user

  5. Februar 2014 06:21

  Hi Josh

  an alternative is the Lengths Activity. Here is an example:

  <Activity mc:Ignorable="sap sads" x:Class="{x:Null}" sap:VirtualizedContainerService.HintSize="387,797" mva:VisualBasic.Settings="Assembly references and imported namespaces serialized as XML namespaces"

   

   xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities"

   

   xmlns:eac="clr-namespace:ESRI.ArcGIS.Client;assembly=ESRI.ArcGIS.Client"

   

   xmlns:eacg="clr-namespace:ESRI.ArcGIS.Client.Geometry;assembly=ESRI.ArcGIS.Client"

   

   xmlns:eact="clr-namespace:ESRI.ArcGIS.Client.Tasks;assembly=ESRI.ArcGIS.Client"

   

   xmlns:esri="http://schemas.esri.com/arcgis/client/2009"

   

   xmlns:gce="clr-namespace:Geocortex.Core.Extensions;assembly=Geocortex.Core"

   

   xmlns:gfc="clr-namespace:Geocortex.Forms.Client;assembly=Geocortex.EssentialsWpfApi"

   

   xmlns:gfci="clr-namespace:Geocortex.Forms.Client.Items;assembly=Geocortex.EssentialsWpfApi"

   

   xmlns:gr="clr-namespace:Geocortex.Reporting;assembly=Geocortex.Reporting"

   

   xmlns:gwa="clr-namespace:Geocortex.Workflow.Activities;assembly=Geocortex.Workflow"

   

   xmlns:gwa1="clr-namespace:Geocortex.Workflow.Activities;assembly=Geocortex.Workflow.Activities"

   

   xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

   

   xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities"

   

   xmlns:s="clr-namespace:System;assembly=System.Core"

   

   xmlns:s1="clr-namespace:System;assembly=System"

   

   xmlns:s2="clr-namespace:System;assembly=mscorlib"

   

   xmlns:s3="clr-namespace:System;assembly=System.Reactive.Core"

   

   xmlns:s4="clr-namespace:System;assembly=System.ComponentModel.Composition"

   

   xmlns:sa="clr-namespace:System.Activities;assembly=System.Activities"

   

   xmlns:sads="http://schemas.microsoft.com/netfx/2010/xaml/activities/debugger"

   

   xmlns:sap="http://schemas.microsoft.com/netfx/2009/xaml/activities/presentation"

   

   xmlns:scg="clr-namespace:System.Collections.Generic;assembly=mscorlib"

   

   xmlns:sl="clr-namespace:System.Linq;assembly=System.Core"

   

   xmlns:sw="clr-namespace:System.Windows;assembly=PresentationFramework"

   

   xmlns:sw1="clr-namespace:System.Windows;assembly=WindowsBase"

   

   xmlns:sw2="clr-namespace:System.Windows;assembly=PresentationCore"

   

   xmlns:swt="clr-namespace:System.Windows.Threading;assembly=WindowsBase"

   

   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

   

    <Sequence sap:VirtualizedContainerService.HintSize="347,1037" mva:VisualBasic.Settings="Assembly references and imported namespaces serialized as XML namespaces">

   

      <Sequence.Variables>

   

        <Variable x:TypeArguments="esri:Polyline" Name="polyline1" />

   

        <Variable x:TypeArguments="esri:Graphic" Name="graphic1" />

   

        <Variable x:TypeArguments="scg:IList(esri:Graphic)" Name="iListOfGraphics" />

   

        <Variable x:TypeArguments="scg:List(x:Double)" Name="listOfLengths" />

   

        <Variable x:TypeArguments="esri:Geometry" Name="geometry1" />

   

      </Sequence.Variables>

   

      <sap:WorkflowViewStateService.ViewState>

   

        <scg:Dictionary x:TypeArguments="x:String, x:Object">

   

          <x:Boolean x:Key="IsExpanded">True</x:Boolean>

   

        </scg:Dictionary>

   

      </sap:WorkflowViewStateService.ViewState>

   

      <gwa1:CaptureGeometry CaptureType="[Geocortex.Workflow.Activities.GeometryCaptureType.Polyline]" sap:VirtualizedContainerService.HintSize="325,82" Result="[geometry1]" />

   

      <Assign sap:VirtualizedContainerService.HintSize="325,59">

   

        <Assign.To>

   

          <OutArgument x:TypeArguments="esri:Graphic">[graphic1]</OutArgument>

   

        </Assign.To>

   

        <Assign.Value>

   

          <InArgument x:TypeArguments="esri:Graphic">[new Graphic]</InArgument>

   

        </Assign.Value>

   

      </Assign>

   

      <Assign sap:VirtualizedContainerService.HintSize="325,59">

   

        <Assign.To>

   

          <OutArgument x:TypeArguments="esri:Geometry">[graphic1.Geometry]</OutArgument>

   

        </Assign.To>

   

        <Assign.Value>

   

          <InArgument x:TypeArguments="esri:Geometry">[geometry1]</InArgument>

   

        </Assign.Value>

   

      </Assign>

   

      <Assign sap:VirtualizedContainerService.HintSize="325,59">

   

        <Assign.To>

   

          <OutArgument x:TypeArguments="esri:SpatialReference">[graphic1.Geometry.SpatialReference]</OutArgument>

   

        </Assign.To>

   

        <Assign.Value>

   

          <InArgument x:TypeArguments="esri:SpatialReference">[new SpatialReference(102100)]</InArgument>

   

        </Assign.Value>

   

      </Assign>

   

      <gwa1:CreateList x:TypeArguments="esri:Graphic" sap:VirtualizedContainerService.HintSize="325,59" Result="[iListOfGraphics]" />

   

      <gwa1:InsertIntoList x:TypeArguments="esri:Graphic" sap:VirtualizedContainerService.HintSize="325,105" Index="0" Item="[graphic1]" List="[iListOfGraphics]" />

   

      <gwa1:LengthsTask GeometryServiceUrl="http://geo.rdc.govt.nz/ArcGIS/rest/services/Utilities/Geometry/GeometryServer" Graphics="[iListOfGraphics]" sap:VirtualizedContainerService.HintSize="325,128" LengthUnit="[ESRI.ArcGIS.Client.Tasks.LinearUnit.Meter]" Results="[listOfLengths]" />

   

      <gwa1:Alert sap:VirtualizedContainerService.HintSize="325,82" Text="[listOfLengths(0).ToString]" />

   

    </Sequence>

   

  </Activity>

   

  Copy the code block above into a text editor.

  Save as  workflow.xaml (or some name better than that)

  Open in the workflow designer and run in the SImulator.

  During the running process you can select a polyline geometry example by clicking on the question mark at the righthand end of the input box.

  Hope that helps

  Ralph

   

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  Permanently deleted user

  5. Februar 2014 22:20

  Great idea Ralph.  I added your Sequence to my workflow so that I could pass the Polyline into your Sequence.  I modified the spatial reference to my maps spatial reference (4326) and changed the length unit to Foot but the Alert is saying (System.Collections.Generic.List'1[System.Double]) at runtime.  Am I not able to convert a List<Double> to a string?

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  Permanently deleted user

  5. Februar 2014 23:41

  Hi Ralp,

  I realized I needed to add a ForEach loop to loop through each Double and that works.  My only issue now is probably on my end but the distance value that is being output in the Alert is way off.  I set the spatial reference to my maps reference (4326) and set my linear units to feet but its way off so I'll keep adjusting that to see if I can find the correct parameters.

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