ONE_RAY

       Draw a line with a specified starting point, length, and  angle

       one_ray, xcen, ycen, len, angle, terminus, [  THICK=, COLOR =, /NODRAW ]

       xcen, ycen = starting point in device coordinates, floating point
                       scalars
       len        = length in pixels, device coordinates
       angle      = angle in degrees counterclockwise from +X direction

       terminus = two-element vector giving ending point of ray in device
               coordinates

       thick    usual IDL meaning, default = 1.0
       color    usual IDL meaning, default = !P.COLOR
       nodraw   if non-zero, the ray is not actually drawn, but the terminus
               is still calculated

       Draw a double thickness line of length 32 pixels from (256,256)
       45 degrees counterclockwise from the X axis
       IDL> one_ray, 256, 256, 32, 45 ,term, THICK = 2
 PROCEDURE:  straightforward matrix arithmetic

    Written by R. S. Hill, Hughes STX Corp., 20-May-1992.
    Modified to work correctly for COLOR=0  J.Wm.Parker  HITC   1995 May 25
       Converted to IDL V5.0   W. Landsman   September 1997

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