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Annotation of researchv10dc/man/adm/man9/circle.9, revision 1.1.1.1

1.1       root        1: .TH CIRCLE 9.3
                      2: .CT 2 graphics
                      3: .SH NAME
                      4: circle, disc, arc, ellipse, eldisc, elarc \- circle-drawing functions
                      5: .SH SYNOPSIS
                      6: .B #include <jerq.h>
                      7: .PP
                      8: .B void circle(bp, p, r, f)
                      9: .B "Bitmap *bp; Point p; int r; Code f;
                     10: .PP
                     11: .B void disc(bp, p, r, f)
                     12: .B "Bitmap *bp; Point p; int r; Code f;
                     13: .PP
                     14: .B void arc(bp, p0, p1, p2, f)
                     15: .B "Bitmap *bp; Point p0, p1, p2; Code f;
                     16: .PP
                     17: .B void ellipse(bp, p, a, b, f)
                     18: .B "Bitmap *bp; Point p; int a, b; Code f;
                     19: .PP
                     20: .B void eldisc(bp, p, a, b, f)
                     21: .B "Bitmap *bp; Point p; int a, b; Code f;
                     22: .PP
                     23: .B "void elarc(bp, p0, a, b, p1, p2, f)
                     24: .B "Bitmap *bp; Point p0, p1, p2; int a, b; Code f;
                     25: .SH DESCRIPTION
                     26: .I Circle
                     27: draws the best approximate circle of radius
                     28: .I r
                     29: centered at Point
                     30: .I p
                     31: in the Bitmap
                     32: .I bp
                     33: with Code
                     34: .IR f .
                     35: The circle is guaranteed to be symmetrical about the horizontal,
                     36: vertical and diagonal axes.
                     37: .I Disc
                     38: draws the corresponding disc.
                     39: .PP
                     40: .I Arc
                     41: draws a circular arc centered on
                     42: .IR p0 ,
                     43: traveling counter-clockwise
                     44: from
                     45: .I p1
                     46: to the point on the circle closest to
                     47: .IR p2 .
                     48: .PP
                     49: .I Ellipse
                     50: draws an ellipse centered at
                     51: .I p
                     52: with horizontal semi-axis
                     53: .I a
                     54: and vertical semi-axis
                     55: .I b
                     56: in Bitmap
                     57: .I bp
                     58: with Code
                     59: .IR f .
                     60: .IR Eldisc
                     61: draws the corresponding elliptical disc.
                     62: .I Elarc
                     63: draws the corresponding elliptical arc, traveling
                     64: counter-clockwise from the ellipse point closest to
                     65: .I p1
                     66: to the point closest to
                     67: .IR p2 .
                     68: (Beware the regrettable difference between the calling conventions for
                     69: .I arc
                     70: and
                     71: .IR elarc .)
                     72: .SH BUGS
                     73: When an endpoint of an arc lies near a tail of
                     74: an ellipse so thin that its ends degenerate into
                     75: straight lines,
                     76: .I elarc
                     77: does not try to distinguish which side of the tail the
                     78: point belongs on.

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