NAME
    DrawEllipse -- Draw an ellipse centered at cx,cy with vertical
       and horizontal radii of a,b respectively.

SYNOPSIS
    DrawEllipse( rp, cx, cy, a, b )
                 a1  d0  d1  d2 d3

    void DrawEllipse( struct RastPort *, SHORT, SHORT, SHORT, SHORT);

FUNCTION
   Creates an elliptical outline within the rectangular region
    specified by the parameters, using the current foreground pen color.

INPUTS
    rp - pointer to the RastPort into which the ellipse will be drawn.
    cx - x coordinate of the centerpoint relative to the rastport.
    cy - y coordinate of the centerpoint relative to the rastport.
    a - the horizontal radius of the ellipse (note: a must be > 0)
    b - the vertical radius of the ellipse (note: b must be > 0)

BUGS

NOTES
    this routine does not clip the ellipse to a non-layered rastport.

SEE ALSO
    DrawCircle(), graphics/rastport.h