How does ObjectSnapTypes.Perpendicular work?

[Kevin.Bell]

Hi,

I'd like to understand how ObjectSnapTypes.Perpendicular and ObjectSnapTypes.Quadrants work.

I assumed that to get these to work the user would have to pick a point and then the snap would work when the user selects the second point.

But I can't see any way of passing the first point to the ObjectSnapType class. I've tried this:

XYZ p1 = uidoc.Selection.PickPoint(ObjectSnapTypes.None);

XYZ p2 = uidoc.Selection.PickPoint(ObjectSnapTypes.Perpendicular);

TaskDialog.Show("Message", p1.ToString() + "\n\n" + p2.ToString());

But the snaps don't work.

Is there something I should be doing first?

Thanks.

[so-chong]

Hi,

Did you find this on the Revit API Docs?

http://www.revitapidocs.com/2018/af8ad302-7196-8e2f-f1eb-e5929cda30d9.htm?section=exampleToggle

Hope this helps!

[Kevin.Bell]

yea, I've seen that (I have the SDK installed).

That shows PickPoint(snapsetting, prompt)...

The issue I have is that to snap 'Perpendicular' the user has to pick a point first... i.e. you can only snap perpendicular from a previous point.

I can't see any way of passing the previous point to the command... Unless I've missing something or misunderstanding what ObjectSnapTypes.Perpendicular does...

Cheers,