topic Re: e.Context.GetPickedEntities() not finding any entities in .NET Forum

e.Context.GetPickedEntities() not finding any entities

Jeff_M — Sat, 14 Mar 2020 20:05:23 GMT

I have a number of these PointMonitors in different tools which all work flawlessly. I have one tool that is never finding any entities in the PointMonitor Event. It's so basic that I just don't understand why it's doing this. In the below code it always exits due to paths being null or empty. The TransientGraphics that update do so as they should, so I know the PointMonitor is working. I checked my Aperture setting in case it got set to 0, but it's 10 as always.

Any ideas why it's not finding any entities?

private void Editor_PointMonitor(object sender, PointMonitorEventArgs e) { _currentPoint = e.Context.RawPoint; UpdateTransGraphics(_currentPoint); FullSubentityPath[] paths = e.Context.GetPickedEntities(); if (paths == null || paths.Length == 0) return; ObjectId[] ids = paths[0].GetObjectIds(); if (ids == null || ids.Length == 0) return; ObjectId id = ids[0]; if (id.ObjectClass.DxfName != RXClass.GetClass(typeof(CogoPoint)).DxfName) return; NextPtId = id; }

Re: e.Context.GetPickedEntities() not finding any entities

Norman_Yuan — Sun, 15 Mar 2020 13:25:19 GMT

@Jeff_M

In what context the PointMonitor is handled? It looks like, it is used in a kind of "custom jig" style operation, such as the Editor is waiting for user input from mouse click (Ediotr.GetXxxx()), and when user moves mouse to mull where to pick, the PointMonitor handler generates moving ghost. If so, I believe when Editor is in this state, PointMonitorEventArgs.Context.GetPickedEntities() does not return entities at mouse cursor.

I mentioned this in my latest blog post (yesterday):

https://drive-cad-with-code.blogspot.com/2020/03/showing-helpful-information-as-tool-tip.html

Re: e.Context.GetPickedEntities() not finding any entities

Jeff_M — Sun, 15 Mar 2020 15:50:32 GMT

Thank you, @Norman_Yuan ! Nice solution you created in the blog post.

Re: e.Context.GetPickedEntities() not finding any entities

Alexander.Rivilis — Sun, 15 Mar 2020 17:15:13 GMT

Other solution (if I remember correctly) is using Editor.TurnForcedPickOn/Editor.TurnForcedPickOff pair.

Re: e.Context.GetPickedEntities() not finding any entities

Norman_Yuan — Mon, 16 Mar 2020 03:01:11 GMT

Great suggestion, @Alexander.Rivilis , Thanks.

I never noticed/paid attention to this pair of methods. I went ahead to give it a try, and yes, it does forces the PointMonitorEventArgs.Context.GetPickedEntities() to return entities at/near mouse cursor when the Editor is waiting for user input(picking). So, while my original code in my article works, using this pair of methods seems a more elegant approach.

I have updated the code in my article. Thank you again, @Alexander.Rivilis !