The shape of a run. Different shape has different ways of manipulation. 
   Namespace:   Autodesk.Revit.DB.Architecture  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Members
| Member name | Description | 
|---|---|
| Winder | A winder run has distorted treads, for the sake of space saving at corner. | 
| Sketched | A sketched run can have customized boundary and riser curves. User can customize stair path as well. | 
| Straight | A straight run is defined by a straight line. All treads are rectangular. | 
| Spiral | A spiral run is defined by a cylindrical helix. Both inner and outer boundaries are arcs. Risers are straight lines. |