topic Re: Can I delete vertex on a graphic layer in ArcGIS API for Silverlight Questions

Can I delete vertex on a graphic layer

DanDong — Sun, 10 Oct 2010 00:00:45 GMT

Hi all,

I was coding the functions by using C# and silverlight, I draw a polygon on a graphic layer. Then I want to have a function to delete some of the vertex on the polygon or delete the last point when I am drawing the polygon. Can I do this on a graphic layer? or I must do this on a feature layer? Can you give me some sample codes or suggestion on that? Thank you very much!

Re: Can I delete vertex on a graphic layer

DanDong — Tue, 12 Oct 2010 19:48:47 GMT

can anybody help me~~~~

I just went through 'editor', it can be used in graphic layer and feature layer. So my question is, I have drawn a polygon in a graphic layer with MyDrawObject.DrawMode = DrawMode.Polygon. I want to use editvertex function to edit this polygon, but I dont know how can implement this. If I can edit the polygon in the graphic layer, then I can double click the vertex than delete it. Thanks for everybody!

Re: Can I delete vertex on a graphic layer

JenniferNery — Wed, 13 Oct 2010 13:58:45 GMT

If you want to undo the last vertex while drawing the graphic, this feature enhancement is still in the works for v2.1.

If you want to edit vertices of a graphic that has already been drawn, you should be able to do this on a GraphicsLayer with no problem. You can create a button and set its DataContext to an Editor.

It is similar to this except you are working with GraphicsLayer not FeatureLayer. Look at the button for "Edit Vertices"
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#EditToolsAutoSave

Re: Can I delete vertex on a graphic layer

CarolynWhite — Wed, 02 Mar 2011 12:25:58 GMT

Where can I read about about this new feature in the draw class in 2.1?

Re: Can I delete vertex on a graphic layer

IgressT — Wed, 02 Mar 2011 18:13:12 GMT

Where can I read about about this new feature in the draw class in 2.1?

This worked for me.
I created a graphics layer , set the editor graphics layer as this layer.
Created a new polygon graphic and selected the Edit Vertices in the editor which displayed all the vertices of the graphic.
I double clicked the vertex which i wanted to delete and the vertex was deleted

Not sure if thats what you want.

Re: Can I delete vertex on a graphic layer

JenniferNery — Sun, 12 Dec 2021 00:31:42 GMT

If you are using Draw, you can read about these methods from here: http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.Draw_methods.html

You can modify this sample to include the following code. Be sure to wire up to Map.MouseClick and Map.KeyDown events.http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#DrawGraphics

MapPoint addPoint;
void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)
{
 addPoint = e.MapPoint;
}

void MyMap_KeyDown(object sender, KeyEventArgs e)
{
 if (e.Key == Key.Delete)
  MyDrawObject.UndoLastVertex();
 else if (e.Key == Key.Insert)
  MyDrawObject.AddVertex(addPoint);
 else if (e.Key == Key.Enter)
  MyDrawObject.CompleteDraw();
}