Determines if this CurveLoop is oriented counter-clockwise (CCW) or clockwise (CW) with respect to the specified 3D direction.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)
Since: 2012
Syntax
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Parameters
- normal
- Type: Autodesk.Revit.DB XYZ
The normal vector to the plane used for this determination.
Return Value
True if the curve loop is oriented counter-clockwise with respect to the specified 3D direction, false if the loop is oriented clockwise.Remarks
CCW means that the projection of the CurveLoop onto a plane having "normal" as its oriented normal is CCW. This method should only be called if the loop is closed and has a non-singular projection onto the plane (i.e., the projection should have no self-intersections and should not be degenerate or even nearly degenerate). The return value in other cases is indeterminate.
Exceptions
| Exception | Condition |
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |
| Autodesk.Revit.Exceptions InvalidOperationException | The curve loop is open or consists of a single unbound curve; counterclockwise determination has no meaning. |