Fix the direction of a segment. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- iSegment
 -  Type:  System Int32  
Index of the segment (0 to NumberOfSegments - 1). 
- vecCoordX
 -  Type:  System Double  
The x-coordinate of a 2D vector specifying the segment direction. 
- vecCoordY
 -  Type:  System Double  
The y-coordinate of a 2D vector specifying the segment direction. 
Remarks
 The centerline of the segment will be constrained to be parallel to the vector. The segment must have at least one constraint. 
 Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions ArgumentException | iSegment is not between 0 and NumberOfSegments. -or- The length of the vector (vecCoordX, vecCoordY) is too close to zero. |