Syntax

   @ConvertToArc()
   @ConvertToArc(<primaryRadiusAttrName>,
      <secondaryRadiusAttrName>,
      <startAngleAttrName>, 
      <sweepAngleAttrName>)
   @ConvertToArc(<primaryRadiusAttrName>,
      <secondaryRadiusAttrName>,
      <startAngleAttrName>, 
      <sweepAngleAttrName>,
      <direction>,
      <startX>,<startY>,
      <endX>,<endY>)
   @ConvertToArc(ARC3POINTS)

Arguments

   <primaryRadiusAttrName>  
   
      The name of the attribute set to the radius of the arc along the primary 
      axis.
   
      Range: String  
      
   <secondaryRadiusAttrName>   
   
      The name of the attribute set to the radius of the arc along the secondary 
      axis. Only circular arcs are generated; therefore, the primary and 
      secondary radii are always the same.
   
      Range: String  
      
   <startAngleAttrName>   
   
      The name of the attribute set to the angle of the arc, as measured 
      counterclockwise from horizontal.
   
      Range: String  
      
   <sweepAngleAttrName>   
   
      The name of the attribute set to the sweep, or duration, of the arc. This 
      is always a positive value and is counterclockwise from the starting 
      angle.
   
      Range: String  
      
   The following arguments are ONLY required for the second alternative of the 
   function.
   
   <direction> 
   
      CCW or CW, for counterclockwise or clockwise direction.
   
      Range: String  
      
   <startX> 
   
      x coordinate value for the start point of the circular curve.
   
      Range: Real value 
      
   <startY> 
   
      y coordinate value for the start point of the circular curve
   
      Range: Real value 
      
   <endX>   
   
      x coordinate value for the end point of the circular curve
   
      Range: Real value 
      
   <endY>   
   
      y coordinate value for the end point of the circular curve
   
      Range: Real value 
      
   The following argument is applicable ONLY to the @ConvertToArc(ARC3POINTS) 
   alternative. It builds an arc definition where the 3 coincident points on the 
   circular arc specified in the coordinates of a linear feature.
    
   ARC3POINTS  
   
      A constant value. 

      Range: String  
      
Description

   If the function is used with no parameters:
   This function gives us arc estimations of lines, other arcs, paths, polygons
   and ellipses. For lines, it takes start, middle and end points and draws arc
   around them, however it rejects lines with less than 3 points. For arcs, it
   just redraws them, since they already have good estimation. For path, it casts
   them into lines, and deals with lines accordingly. For polygons and ellipses,
   it casts them as curves, and deals with them as if they were lines, arcs or
   paths. It rejects all other feature types.

   If the function is used with 4 parameters:
   This function calculates the center point, radius, start angle, and sweep 
   angle of a circular arc that starts at the first point of the line passed in, 
   ends at the last, and passes through the middle point where middle is the 
   (n/2)th point in the line, not geometrically the middle point. It sets 
   attributes on the feature to hold the radius, start angle, and sweep angle, 
   and sets the geometry of the feature to be a single point that is the center 
   point of the circle.

   If this function is called on a feature with less than 3 points, it will 
   abort the translation. If this function is called on a feature with exactly 3 
   points, the arc will be guaranteed to pass through all of them. If it is 
   called on a feature with more than 3 points, the arc will approximate the 
   curve and will be guaranteed to pass through the first, last, and middle 
   point only.
   
   If the function is used with 9 parameters:
   Alternatively, the radius, start angle, and sweep angle can be calculated 
   from a circular arc defined by the circle's center point, the arc's start 
   point and end point, and finally the direction of the arc, either 
   counterclockwise or clockwise from start to end. The center point of the 
   circle must be specified as the first coordinate of the feature. 

   If the function is used with 1 parameter:
   @ConvertToArc(ARC3POINTS) must be applied to a linear feature where the 
   coordinates of the line correspond to the 3 control points coincident to the 
   circular arc. ARC3POINTS is a constant value. The number of points in the 
   line must be at least 3, if the number of points in the line is greater than 
   3, then the number of points must be odd, specifically they must be, (2*N 
   +1), where N is the number of consecutive arcs formed. Each consecutive arc 
   share a common control point, If more than one arc is formed then the feature 
   will be converted into a path with consecutive arc segments.