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Annotation of researchv10dc/630/man/src/p_man/man3/fpt.3l, revision 1.1.1.1

1.1       root        1: .ds ZZ DEVELOPMENT PACKAGE
                      2: .TH FPT 3L "630 MTG"
                      3: .XE "fPt()"
                      4: .XE "fRpt()"
                      5: .XE "fRect()"
                      6: .SH NAME
                      7: fpt: fPt, fRpt, fRect \- create a Point or Rectangle from arguments
                      8: .SH SYNOPSIS
                      9: .ft B
                     10: #include <dmd.h>
                     11: .sp
                     12: Point fPt (x, y)
                     13: .br
                     14: int x, y;
                     15: .sp
                     16: Rectangle fRpt (p, q)
                     17: .br
                     18: Point p, q;
                     19: .sp
                     20: Rectangle fRect (a, b, c, d)
                     21: .br
                     22: int a, b, c, d;
                     23: 
                     24: .SH DESCRIPTION
                     25: .PP
                     26: The
                     27: .I fPt
                     28: function returns a point made from the two arguments.
                     29: .PP
                     30: The
                     31: .I fRpt
                     32: function returns a rectangle made from the two points.
                     33: .PP
                     34: The
                     35: .I fRect
                     36: function returns a rectangle made from the four arguments.
                     37: This function differs from \fIcanon(3R)\fR in that the points are not sorted first
                     38: to guarantee a positive area.
                     39: .PP
                     40: The above functions are not macros as are the ones in \fIpt(3L)\fR; therefore,
                     41: allow C language assignment constructs.
                     42: .SH EXAMPLE
                     43: The following subroutine draws two boxes in the upper
                     44: left corner of the window.
                     45: .nf
                     46: .ft CM
                     47: #include <dmd.h>
                     48: 
                     49: Point fPt();
                     50: Rectangle fRpt();
                     51: Rectangle fRect();
                     52: 
                     53: Point add();
                     54: Rectangle raddp();
                     55: 
                     56: drawboxes()
                     57: {
                     58:        Rectangle r;
                     59:        
                     60:        r = fRpt(Drect.origin, add(Drect.origin, Pt(100,100)));
                     61:        box(&display, r, F_STORE);
                     62: 
                     63:        r = fRect(0,0,200,200);
                     64:        box(&display, raddp(r, Drect.origin), F_STORE);
                     65: }
                     66: \fR
                     67: .fi
                     68: .RE
                     69: .SH SEE ALSO
                     70: canon(3R), pt(3L).

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