topic Re: Bug in Draw.UndoLastVertex ? in ArcGIS API for Silverlight Questions

Bug in Draw.UndoLastVertex ?

JoshPorter — Fri, 10 Aug 2012 19:07:21 GMT

The first call to undo last vertex does nothing, and calling it a second time actually removes the last vertex. Has anyone else noticed this?

To confirm the number of vertices in the shape being drawn, i am incrementing a counter in the Draw.VertexAdded event handler. The counter is incrementing as one would expect, at every click or call to AddVertex while the Draw object IsEnabled. But the call to UndoLastVertex consistently takes two calls to remove one vertex. Can anyone confirm this?

Re: Bug in Draw.UndoLastVertex ?

JoshPorter — Fri, 10 Aug 2012 19:40:09 GMT

Only need to call this twice for polygons. For polylines it works just fine the first time.

Re: Bug in Draw.UndoLastVertex ?

TomRippetoe — Fri, 28 Dec 2012 22:20:42 GMT

Did you ever get any response to your question? or develop a work around? I am seeing the same behavior for polygons (not polylines). I am using version 3.0.0.388 of the Silverlight client library.

thanks.

Re: Bug in Draw.UndoLastVertex ?

DominiqueBroux — Fri, 04 Jan 2013 11:59:20 GMT

Thanks for reporting this issue, we'll try to get it fixed in a future version.

Re: Bug in Draw.UndoLastVertex ?

samulineuvonen — Sun, 12 Dec 2021 07:54:18 GMT

Hello,

Just to update: seems to me this bug still exists (API version 3.0). At least for my application the workaround was to simply check EditMode and call undo twice for polygons.

this.MeasureDrawObject.UndoLastVertex();
if (this.MeasureDrawObject.DrawMode==DrawMode.Polygon)  //BUG: polygons need two calls
{
     this.MeasureDrawObject.UndoLastVertex();
}

Regards,
Samuli N.