CIRCLE(9.3)                                           CIRCLE(9.3)

     NAME
          circle, disc, arc, ellipse, eldisc, elarc - circle drawing
          functions for jerq

     SYNOPSIS
          #include <jerq.h>

          void circle(bp, p, r, f) Bitmap *bp; Point p; int r; Code f;

          void disc(bp, p, r, f) Bitmap *bp; Point p; int r; Code f;

          void arc(bp, p0, p1, p2, f) Bitmap *bp; Point p0, p1, p2;
          Code f;

          void ellipse(bp, p, a, b, f) Bitmap *bp; Point p; int a, b;
          Code f;

          void eldisc(bp, p, a, b, f) Bitmap *bp; Point p; int a, b;
          Code f;

          void elarc(bp, p0, a, b, p1, p2, f) Bitmap *bp; Point p0,
          p1, p2; int a, b; Code f;

     DESCRIPTION
          Circle draws the best approximate circle of radius r cen-
          tered at point p in the Bitmap bp with Code f. The circle is
          guaranteed to be symmetrical about the horizontal, vertical
          and diagonal axes.  Disc draws the corresponding disc.

          Arc draws a circular arc centered on p0, travelling
          counter-clockwise from p1 to the point on the circle closest
          to p2.

          Ellipse draws an ellipse centered at p with horizontal
          semi-axis a and vertical semi-axis b in Bitmap bp with Code
          f. Eldisc draws the corresponding elliptical disc.  Elarc
          draws the correspoding elliptical arc, travelling counter-
          clockwise from the ellipse point closest to p1 to the point
          closest to p2. (Beware the regrettable difference between
          the calling conventions for arc and elarc.)

     BUGS
          When an endpoint of an arc lies on a tail of an ellipse so
          thin that its ends degenerate into straight lines, elarc
          does not try to distinguish which `side' of the tail the
          point belongs on.