A constraint that can be applied to a RebarShapeDefinitionByArc and drives the straight distance between the arc endpoints. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
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Inheritance Hierarchy
  System Object  
Autodesk.Revit.DB.Structure RebarShapeConstraint
Autodesk.Revit.DB.Structure RebarShapeConstraintChordLength
 
 Autodesk.Revit.DB.Structure RebarShapeConstraint
Autodesk.Revit.DB.Structure RebarShapeConstraintChordLength