NAME:
  ellipse2hull
 PURPOSE:   (one line only)
  Given an ellipse, sample it to a discrete curve
 DESCRIPTION:
 CATEGORY:
  Miscellaneous
 CALLING SEQUENCE:
  ellipse2hull,ellipse,x,y
 INPUTS:
  ellipse - five element vector (used for fitting)
            [0] = semi-major axis
            [1] = semi-minor axis
            [2] = x center of ellipse
            [3] = y center of ellipse
            [4] = position angle of ellipse [radians]
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
  NPTS - number of points in curve (default=101), first and last will be
            the same so that it is a closed curve
 OUTPUTS:
  x - discrete x points on curve
  y - discrete y points on curve
 KEYWORD OUTPUT PARAMETERS:
 CONFIGURATION:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2022/04/06