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

1.1     ! root        1: .TH BOX 3R "630 MTG"
        !             2: .XE "box()"
        !             3: .SH NAME
        !             4: box \- draw a Rectangle
        !             5: .SH SYNOPSIS
        !             6: .ft B
        !             7: #include <dmd.h>
        !             8: .sp
        !             9: void box (bp, r, f)
        !            10: .br
        !            11: Bitmap \(**bp;
        !            12: .br
        !            13: Rectangle r;
        !            14: .br
        !            15: Code f;
        !            16: .SH DESCRIPTION
        !            17: The
        !            18: .I box
        !            19: function
        !            20: draws the Rectangle
        !            21: .I r
        !            22: in the Bitmap
        !            23: .I bp
        !            24: using function Code
        !            25: .IR f .
        !            26: The coordinates of the corner point of the Rectangle
        !            27: .I r
        !            28: are decremented by one
        !            29: before the outline is drawn so that abutting
        !            30: Rectangles do not have common edges.
        !            31: .SH EXAMPLE
        !            32: The following subroutine can be used to draw a rectangle in the window and
        !            33: have its position follow mouse movement.
        !            34: .PP
        !            35: .RS
        !            36: .ft CM
        !            37: .nf
        !            38: .S -4
        !            39: #include <dmd.h>
        !            40: 
        !            41: int request();
        !            42: int wait();
        !            43: Rectangle raddp();
        !            44: void box();
        !            45: int eqpt();
        !            46: 
        !            47: trackRect(tr)
        !            48: Rectangle tr;
        !            49: {
        !            50:        Rectangle r;
        !            51:        Point     p,q;
        !            52:        int half_height, half_width;
        !            53: 
        !            54:        half_width  = (tr.corner.x - tr.origin.x)/2;
        !            55:        half_height  = (tr.corner.y - tr.origin.y)/2;
        !            56:        request (MOUSE);
        !            57:        while (!button1())
        !            58:                wait(MOUSE);
        !            59:        q = mouse.xy;
        !            60:        /*
        !            61:         * position the rectangle with mouse position
        !            62:         * in the middle
        !            63:         */
        !            64:        r = raddp (tr, Pt(q.x - half_width,
        !            65:                   q.y - half_height));
        !            66:        box (&display, r, F_XOR);
        !            67:        do {
        !            68:                /*
        !            69:                 * NOTE:  This do-while loop does not give up
        !            70:                 * the CPU for other processes to run.
        !            71:                 */
        !            72:                p = mouse.xy;
        !            73:                if (!eqpt(p, q)){
        !            74:                /* allow update of mouse and video refresh */
        !            75:                nap(2);
        !            76:                box (&display, r, F_XOR);
        !            77:                r = raddp (tr, Pt(p.x - half_width,
        !            78:                           p.y - half_height));
        !            79:                        nap(2);
        !            80:                        box (&display, r, F_XOR);
        !            81:                        q = p;
        !            82:                }
        !            83:        } while( bttn(1) );
        !            84: }\fR
        !            85: .fi
        !            86: .ft R
        !            87: .RE
        !            88: .S +4
        !            89: .SH SEE ALSO
        !            90: structures(3R).

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