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Annotation of researchv10dc/630/man/src/p_man/man3/jellipse.3l, revision 1.1

1.1     ! root        1: .ds ZZ DEVELOPMENT PACKAGE
        !             2: .TH JELLIPSE 3L "630 MTG"
        !             3: .XE "jellipse()"
        !             4: .XE "jeldisc()"
        !             5: .XE "jelarc()"
        !             6: .SH NAME
        !             7: jellipse, jeldisc, jelarc \- draw ellipse on display
        !             8: .SH SYNOPSIS
        !             9: .B #include <dmd.h>
        !            10: .sp
        !            11: .B void jellipse (p, a, b, f)
        !            12: .PP
        !            13: .B void jeldisc (p, a, b, f)
        !            14: .PP
        !            15: \fBvoid jelarc (p, a, b, p1, p2, f)\fR
        !            16: .PP
        !            17: .B Point p, p1, p2;
        !            18: .br
        !            19: .B int a, b;
        !            20: .br
        !            21: .B Code f;
        !            22: .SH DESCRIPTION
        !            23: The
        !            24: .I jellipse
        !            25: function
        !            26: draws 
        !            27: an approximate ellipse centered at
        !            28: .IR p ,
        !            29: with horizontal semi-axis
        !            30: .I a
        !            31: and vertical semi-axis
        !            32: .I b
        !            33: with Code
        !            34: .IR  f 
        !            35: in the display bitmap.
        !            36: .PP
        !            37: The
        !            38: .I jeldisc
        !            39: function
        !            40: draws an elliptical disc centered at
        !            41: .IR p ,
        !            42: with horizontal semi-axis
        !            43: .I a
        !            44: and vertical semi-axis
        !            45: .I b
        !            46: with Code
        !            47: .IR f 
        !            48: in the display bitmap.
        !            49: .PP
        !            50: The
        !            51: .I jelarc
        !            52: function
        !            53: draws the corresponding elliptical arc,
        !            54: centered at
        !            55: .IR p ,
        !            56: counterclockwise from the ellipse point closest to
        !            57: .I p1
        !            58: to the ellipse point closest to
        !            59: .I p2
        !            60: with Code
        !            61: .IR f 
        !            62: in the display bitmap.
        !            63: .PP
        !            64: All coordinates and semi-axes are in window coordinates.
        !            65: .SH EXAMPLE
        !            66: The following routine draws a row of eight ellipses,
        !            67: a row of eight discs, and a row of eight arcs, scaled
        !            68: to the shape of the window.
        !            69: .PP
        !            70: .RS 3
        !            71: .ft CM
        !            72: .nf
        !            73: #include <dmd.h>
        !            74: 
        !            75: draw()
        !            76: {
        !            77:   Point p;
        !            78:   int i, r;
        !            79: 
        !            80:   r = 50;
        !            81:   p.y = 200;
        !            82:   for ( p.x=100; p.x < XMAX-50; p.x+=120)
        !            83:        jellipse (p, r, r-25, F_XOR);
        !            84:   p.y = 600;
        !            85:   for ( p.x=100; p.x < XMAX-50; p.x+=120)
        !            86:        jeldisc (p, r-25, r, F_XOR);
        !            87:   p.y = 900;
        !            88:   for (p.x=100; p.x < XMAX-50; p.x+=120)
        !            89:        jelarc (p, r, r, Pt(p.x-r, p.y),
        !            90:                Pt(p.x+r, p.y), F_XOR);
        !            91: 
        !            92:   request(KBD);
        !            93:   wait(KBD);
        !            94: }
        !            95: .fi
        !            96: .RE
        !            97: .ft R
        !            98: .SH SEE ALSO
        !            99: circle(3L), ellipse(3L), globals(3R), jcircle(3L),
        !           100: structures(3R), transform(3R/3L).

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