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Annotation of researchv10dc/630/man/src/p_man/man3/ptarith.3r, revision 1.1

1.1     ! root        1: .ds ZZ DEVELOPMENT PACKAGE
        !             2: .TH PTARITH 3R "630 MTG"
        !             3: .XE "add()"
        !             4: .XE "sub()"
        !             5: .XE "mul()"
        !             6: .XE "div()"
        !             7: .SH NAME
        !             8: ptarith: add, sub, mul, div \- arithmetic on Points
        !             9: .SH SYNOPSIS
        !            10: .ft B
        !            11: #include <dmd.h>
        !            12: .sp
        !            13: Point add (p, q)
        !            14: .sp
        !            15: Point sub (p, q) 
        !            16: .sp
        !            17: Point mul (p, a)
        !            18: .sp
        !            19: Point div (p, a)
        !            20: .sp
        !            21: Point p, q;
        !            22: .br
        !            23: int a;
        !            24: .SH DESCRIPTION
        !            25: The
        !            26: .I add
        !            27: function
        !            28: returns the Point sum of its arguments:
        !            29: .sp
        !            30: .ce
        !            31: .ft CM
        !            32: { p.x+q.x, p.y+q.y }
        !            33: .sp
        !            34: .ft R
        !            35: The
        !            36: .I sub
        !            37: function
        !            38: returns the Point difference of its arguments:
        !            39: .sp
        !            40: .ce
        !            41: .ft CM
        !            42: { p.x-q.x, p.y-q.y }
        !            43: .sp
        !            44: .ft R
        !            45: The
        !            46: .I mul
        !            47: function
        !            48: returns the Point:
        !            49: .sp
        !            50: .ce
        !            51: .ft CM
        !            52: { p.x*a, p.y*a }
        !            53: .sp
        !            54: .ft R
        !            55: The
        !            56: .I div
        !            57: function
        !            58: returns the Point:
        !            59: .sp
        !            60: .ce
        !            61: .ft CM
        !            62: { p.x/a, p.y/a }.
        !            63: .sp
        !            64: .ft R
        !            65: .SH EXAMPLE
        !            66: The following routine returns the center Point of a \f2window\f1.
        !            67: .PP
        !            68: .RS 3
        !            69: .nf
        !            70: .ft CM
        !            71: #include <dmd.h>
        !            72: Point add();
        !            73: Point sub();
        !            74: Point div();
        !            75: Point
        !            76: getcenter()
        !            77: {
        !            78:     Point offset;
        !            79:     offset = div (sub
        !            80:         (Drect.corner,Drect.origin), 2);
        !            81:     return add (Drect.origin, offset);
        !            82: }
        !            83: \fR
        !            84: .fi
        !            85: .RE
        !            86: .SH SEE ALSO
        !            87: globals(3R), rectarith(3R),  transform(3R/3L).

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