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Annotation of researchv9/jtools/man/man3/circle.3, revision 1.1

1.1     ! root        1: .TH CIRCLE 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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