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

1.1       root        1: .ds ZZ DEVELOPMENT PACKAGE
                      2: .TH JCIRCLE 3L "630 MTG"
                      3: .XE "jcircle()"
                      4: .XE "jdisc()"
                      5: .XE "jarc()"
                      6: .SH NAME
                      7: jcircle, jdisc, jarc \- draw circle on display
                      8: .SH SYNOPSIS
                      9: .B #include <dmd.h>
                     10: .sp
                     11: .B void jcircle (p, r, f)
                     12: .PP
                     13: .B void jdisc (p, r, f)
                     14: .PP
                     15: .B void jarc (p, p1, p2, f)
                     16: .PP
                     17: .B Point p, p1, p2;
                     18: .br
                     19: .B int r;
                     20: .br
                     21: .B Code f;
                     22: .SH DESCRIPTION
                     23: The
                     24: .I jcircle
                     25: function
                     26: draws 
                     27: the approximate circle of radius
                     28: .I r
                     29: centered at
                     30: .I p
                     31: with Code
                     32: .IR f 
                     33: in the 
                     34: display bitmap.
                     35: .PP
                     36: The
                     37: .I jdisc
                     38: function
                     39: draws a disc of radius
                     40: .I r
                     41: centered at
                     42: .I p
                     43: with Code
                     44: .IR f 
                     45: in the 
                     46: display bitmap.
                     47: .PP
                     48: The
                     49: .I jarc
                     50: function
                     51: draws the circular arc centered at
                     52: .I p
                     53: counterclockwise from
                     54: .I p1
                     55: to the point on the circle closest to
                     56: .I p2
                     57: with Code
                     58: .IR f 
                     59: in the 
                     60: display bitmap.
                     61: .PP
                     62: All coordinates and radii are in window coordinates.
                     63: Because the window is scaled,
                     64: these routines are actually implemented by calls to the ellipse routines.
                     65: .SH EXAMPLE
                     66: The following routine draws a row of eight circles,
                     67: a row of eight discs, and a row of eight arcs, scaled
                     68: to the shape of the window.
                     69: .PP
                     70: .RS 3
                     71: .ft CM
                     72: .nf
                     73: #include <dmd.h>
                     74: 
                     75: draw()
                     76: {
                     77:   Point p;
                     78:   int i, r;
                     79: 
                     80:   r = 50;
                     81:   p.y = 200;
                     82:   for (p.x=100; p.x < XMAX-50; p.x+=120)
                     83:        jcircle (p, r, F_XOR);
                     84:   p.y = 600;
                     85:   for (p.x=100; p.x < XMAX-50; p.x+=120)
                     86:        jdisc (p, r, F_XOR);
                     87:   p.y = 900;
                     88:   for (p.x=100; p.x < XMAX-50; p.x+=120)
                     89:        jarc (p, Pt(p.x-r, p.y), Pt(p.x+r,
                     90:              p.y), F_XOR);
                     91: 
                     92:   request(KBD);
                     93:   wait(KBD);
                     94: }
                     95: .fi
                     96: .ft R
                     97: .RE
                     98: .SH SEE ALSO
                     99: circle(3L), ellipse(3L), globals(3R), jellipse(3L),
                    100: structures(3R), transform(3R/3L).

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