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

1.1     ! root        1: .TH CIRCLE 3L "630 MTG"
        !             2: .XE "circle()"
        !             3: .XE "disc()"
        !             4: .XE "discture()"
        !             5: .XE "arc()"
        !             6: .SH NAME
        !             7: circle, disc, discture, arc \- circle routines
        !             8: .SH SYNOPSIS
        !             9: .B #include <dmd.h>
        !            10: .sp
        !            11: \f3void circle (b, p, r, f)\f1
        !            12: .sp
        !            13: .B void disc (b, p, r, f)
        !            14: .sp
        !            15: \f3void discture (b, p, r, t, f)\f1
        !            16: .sp
        !            17: \f3void arc (b, p, p1, p2, f)\f1
        !            18: .sp
        !            19: .B Bitmap \(**b;
        !            20: .br
        !            21: .B Point p, p1, p2;
        !            22: .br
        !            23: .B int r;
        !            24: .br
        !            25: .B Texture16 \(**t;
        !            26: .br
        !            27: .B Code f;
        !            28: .SH DESCRIPTION
        !            29: The
        !            30: .I circle
        !            31: function
        !            32: draws the best approximate circle of radius
        !            33: .I r
        !            34: centered at Point
        !            35: .I p
        !            36: in the Bitmap
        !            37: .I b
        !            38: with Code
        !            39: .IR f .
        !            40: The circle is guaranteed to be symmetrical about the horizontal,
        !            41: vertical, and diagonal axes.
        !            42: .PP
        !            43: The
        !            44: .I disc
        !            45: function
        !            46: draws a disc of radius
        !            47: .I r
        !            48: centered at Point
        !            49: .I p
        !            50: in the Bitmap
        !            51: .I b
        !            52: with Code
        !            53: .IR f .
        !            54: A disc is a circle which has been completely filled.
        !            55: .PP
        !            56: The
        !            57: .I discture
        !            58: function
        !            59: draws a disc of radius
        !            60: .I r
        !            61: centered at Point
        !            62: .I p
        !            63: in the Bitmap
        !            64: .I b
        !            65: using the Texture16
        !            66: .I t
        !            67: with Code
        !            68: .IR f .
        !            69: The
        !            70: .I discture
        !            71: function
        !            72: is similar to
        !            73: the
        !            74: .I disc
        !            75: function
        !            76: except it allows one to specify a pattern to fill the disc.
        !            77: .PP
        !            78: The
        !            79: .I arc
        !            80: function
        !            81: draws a circular arc centered on
        !            82: .IR p ,
        !            83: traveling counter-clockwise from
        !            84: .I p1
        !            85: to the point on the circle closest to
        !            86: .IR p2 .
        !            87: .SH EXAMPLE
        !            88: The following routine draws a ``smiling face'' in the display Bitmap
        !            89: with center specified by clicking button 1.
        !            90: .PP
        !            91: .RS 3
        !            92: .ft CM
        !            93: .nf
        !            94: .S -4
        !            95: #include <dmd.h>
        !            96: 
        !            97: 
        !            98: main()
        !            99: {
        !           100:        int radius;
        !           101:        extern Texture16 T_darkgrey;
        !           102:        Point s;
        !           103:        
        !           104:        request(MOUSE);
        !           105:        wait(MOUSE);
        !           106:        bttns(1);
        !           107: 
        !           108:        s = mouse.xy;
        !           109:        radius = 50;
        !           110: 
        !           111:        /* smiling will draw the face.  The nose will be 
        !           112:         * placed wherever the mouse is clicked in
        !           113:         * the window.
        !           114:         */
        !           115:        
        !           116:        smiling(&display, s, radius, &T_darkgrey, F_XOR); 
        !           117: 
        !           118:        request(KBD);
        !           119:        wait(KBD);
        !           120: }
        !           121: 
        !           122: 
        !           123: smiling(b, c, rad, t, f)
        !           124: Bitmap  *b;
        !           125: Point    c;
        !           126: int      rad;
        !           127: Texture16 *t;
        !           128: Code     f;
        !           129: {
        !           130:     int mino, e; /* offsets for placing */
        !           131:                 /* eyes, nose and mouth */
        !           132:     int enrad;   /* radius of eyes and nose */
        !           133: 
        !           134:     mino = rad/2;
        !           135:     e = rad/3;
        !           136:     enrad = e/3;
        !           137:     circle (b, c, rad, f); /* face outline */
        !           138:     disc (b, Pt(c.x-e, c.y-mino),
        !           139:          enrad, f);        /* left eye */
        !           140:     disc (b, Pt(c.x+e, c.y-mino),
        !           141:          enrad, f);        /* right eye */
        !           142:     discture (b, c, enrad, t, f); /* nose */
        !           143:     arc (b, c, Pt(c.x-mino, c.y+mino),
        !           144:        Pt(c.x+mino, c.y+mino),f);
        !           145:      /* mouth */
        !           146: }
        !           147: .fi
        !           148: .ft R
        !           149: .RE
        !           150: .S +4
        !           151: .SH SEE ALSO
        !           152: ellipse(3L), jcircle(3L), jellipse(3L), texture(3R).

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