Return to ellipse.3l CVS log

Up to [Research Unix] / researchv10dc / 630 / man / src / p_man / man3

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

1.1     ! root        1: .ds ZZ DEVELOPMENT PACKAGE
        !             2: .TH ELLIPSE 3L "630 MTG"
        !             3: .XE "ellipse()"
        !             4: .XE "eldisc()"
        !             5: .XE "eldiscture()"
        !             6: .XE "elarc()"
        !             7: .SH NAME
        !             8: ellipse, eldisc, eldiscture, elarc \- draw an ellipse
        !             9: .SH SYNOPSIS
        !            10: .B "#include <dmd.h>"
        !            11: .sp
        !            12: .B "void ellipse (bp, p, a, b, f)"
        !            13: .PP
        !            14: .B "void eldisc (bp, p, a, b, f)"
        !            15: .PP
        !            16: .B "void eldiscture (bp, p, a, b, t, f)"
        !            17: .PP
        !            18: .B "void elarc (bp, p, a, b, p1, p2, f)"
        !            19: .PP
        !            20: .B Bitmap \(**bp;   
        !            21: .br
        !            22: .B Point p, p1, p2;
        !            23: .br
        !            24: .B int a, b;
        !            25: .br
        !            26: .B Texture16 \(**t;
        !            27: .br
        !            28: .B Code f;
        !            29: .SH DESCRIPTION
        !            30: The
        !            31: .I ellipse
        !            32: function
        !            33: draws an ellipse centered at
        !            34: .I p
        !            35: with horizontal semi-axis
        !            36: .I a
        !            37: and vertical semi-axis
        !            38: .I b
        !            39: in Bitmap
        !            40: .I bp
        !            41: with Code
        !            42: .IR f .
        !            43: .PP
        !            44: The
        !            45: .I eldisc
        !            46: function
        !            47: draws an elliptical disc centered at
        !            48: .I p
        !            49: with horizontal semi-axis
        !            50: .I a
        !            51: and vertical semi-axis
        !            52: .I b
        !            53: in Bitmap
        !            54: .I bp
        !            55: with Code
        !            56: .IR f .
        !            57: .PP
        !            58: The
        !            59: .I eldiscture
        !            60: function
        !            61: draws an elliptical disc centered at
        !            62: .I p
        !            63: with horizontal semi-axis
        !            64: .I a
        !            65: and vertical semi-axis
        !            66: .I b
        !            67: in Bitmap
        !            68: .I bp
        !            69: using Texture16
        !            70: .I t
        !            71: with Code
        !            72: .IR f .
        !            73: .PP
        !            74: The
        !            75: .I elarc
        !            76: function
        !            77: draws the corresponding elliptical arc, traveling
        !            78: counterclockwise from the ellipse point closest to
        !            79: .I p1
        !            80: to the point closest to
        !            81: .IR p2 .
        !            82: Note: Differences exist between the calling conventions for
        !            83: .I arc
        !            84: and
        !            85: .IR elarc .
        !            86: .SH EXAMPLE
        !            87: The following routine can be used to allow a user to sweep out an
        !            88: ellipse by holding button 1 down.
        !            89: When button 1 is released,
        !            90: the ellipse is filled using the elliptical disc routine.
        !            91: .PP
        !            92: .RS 3
        !            93: .nf
        !            94: .ft CM
        !            95: #include <dmd.h>
        !            96: 
        !            97: main()
        !            98: {
        !            99:        sweep_eldisc();
        !           100:        request(KBD);
        !           101:        wait(KBD);
        !           102: }
        !           103:   
        !           104: sweep_eldisc()
        !           105: {
        !           106:    Point p, c;
        !           107:    int a, b;
        !           108: 
        !           109:    request(MOUSE);
        !           110: 
        !           111:    while (!button1() )
        !           112:       wait (MOUSE);       
        !           113:    c = p = mouse.xy;
        !           114:    while (button1())
        !           115:       if (!eqpt(p, mouse.xy)){
        !           116:          if( !eqpt( p, c))  /* undraw old ellipse */
        !           117:             ellipse (&display, c, a, b, F_XOR);
        !           118:          p = mouse.xy;
        !           119:          a = abs (p.x - c.x);
        !           120:          b = abs (p.y - c.y);
        !           121:          ellipse (&display, c, a, b, F_XOR);
        !           122:       }
        !           123:    ellipse (&display, c, a, b, F_XOR);
        !           124:    eldisc  (&display, c, a, b, F_XOR);
        !           125: }
        !           126: .fi
        !           127: .RE
        !           128: .SH SEE ALSO
        !           129: circle(3L), jcircle(3L), jellipse(3L).

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.