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Annotation of researchv10dc/630/man/src/p_man/man3/point.3r, revision 1.1.1.1

1.1       root        1: .ds ZZ DEVELOPMENT PACKAGE
                      2: .TH POINT 3R "630 MTG"
                      3: .XE "point()"
                      4: .SH NAME
                      5: point \- draw a single pixel in a Bitmap
                      6: .SH SYNOPSIS
                      7: .ft B
                      8: #include <dmd.h>
                      9: .sp
                     10: void point (b, p, f)
                     11: .br
                     12: Bitmap \(**b;
                     13: .br
                     14: Point p;
                     15: .br
                     16: Code f;
                     17: .SH DESCRIPTION
                     18: The
                     19: .I point
                     20: function
                     21: draws the pixel at Point
                     22: .I p
                     23: in the Bitmap
                     24: .I \(**b
                     25: according to function Code
                     26: .IR f .
                     27: .SH EXAMPLE
                     28: The following program determines the Point at the middle of
                     29: the window and draws it.  Hitting any key 
                     30: will exit the program.
                     31: .PP
                     32: .RS 3
                     33: .nf
                     34: .ft CM
                     35: #include <dmd.h>
                     36: 
                     37: Point middle();
                     38: Point add();
                     39: Point div();
                     40: Point sub();
                     41: 
                     42: main()
                     43: {
                     44:        Point centerdot;
                     45:        
                     46:        centerdot = middle();
                     47:        point (&display, centerdot, F_XOR);     
                     48:        request(KBD);
                     49:        wait(KBD);
                     50: }
                     51: 
                     52: Point middle()
                     53: {
                     54:        Point center, offset;
                     55: 
                     56:        offset = div (sub (Drect.corner,
                     57:                Drect.origin), 2);
                     58:        center = add (Drect.origin, offset);
                     59: 
                     60:        return center;
                     61: }
                     62: \fR
                     63: .fi
                     64: .RE
                     65: .SH SEE ALSO
                     66: jpoint(3R).

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