RVTDocs.com

DrawContext.GetViewRectangle

Method
Description:
Gets the rectangle that represents the extent (in 2D) of the Revit view where rendering takes place.
Syntax
public static Rectangle GetViewRectangle()
Exceptions
Exception Condition
InvalidOperationException This DrawContext is not available because Revit is not currently rendering. In general, this DrawContext must be used in the scope of the RenderScene() callback of IDirectContext3DServer.