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

1.1       root        1: .ds ZZ DEVELOPMENT PACKAGE
                      2: .TH JELLIPSE 3L "630 MTG"
                      3: .XE "jellipse()"
                      4: .XE "jeldisc()"
                      5: .XE "jelarc()"
                      6: .SH NAME
                      7: jellipse, jeldisc, jelarc \- draw ellipse on display
                      8: .SH SYNOPSIS
                      9: .B #include <dmd.h>
                     10: .sp
                     11: .B void jellipse (p, a, b, f)
                     12: .PP
                     13: .B void jeldisc (p, a, b, f)
                     14: .PP
                     15: \fBvoid jelarc (p, a, b, p1, p2, f)\fR
                     16: .PP
                     17: .B Point p, p1, p2;
                     18: .br
                     19: .B int a, b;
                     20: .br
                     21: .B Code f;
                     22: .SH DESCRIPTION
                     23: The
                     24: .I jellipse
                     25: function
                     26: draws 
                     27: an approximate ellipse centered at
                     28: .IR p ,
                     29: with horizontal semi-axis
                     30: .I a
                     31: and vertical semi-axis
                     32: .I b
                     33: with Code
                     34: .IR  f 
                     35: in the display bitmap.
                     36: .PP
                     37: The
                     38: .I jeldisc
                     39: function
                     40: draws an elliptical disc centered at
                     41: .IR p ,
                     42: with horizontal semi-axis
                     43: .I a
                     44: and vertical semi-axis
                     45: .I b
                     46: with Code
                     47: .IR f 
                     48: in the display bitmap.
                     49: .PP
                     50: The
                     51: .I jelarc
                     52: function
                     53: draws the corresponding elliptical arc,
                     54: centered at
                     55: .IR p ,
                     56: counterclockwise from the ellipse point closest to
                     57: .I p1
                     58: to the ellipse point closest to
                     59: .I p2
                     60: with Code
                     61: .IR f 
                     62: in the display bitmap.
                     63: .PP
                     64: All coordinates and semi-axes are in window coordinates.
                     65: .SH EXAMPLE
                     66: The following routine draws a row of eight ellipses,
                     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:        jellipse (p, r, r-25, F_XOR);
                     84:   p.y = 600;
                     85:   for ( p.x=100; p.x < XMAX-50; p.x+=120)
                     86:        jeldisc (p, r-25, r, F_XOR);
                     87:   p.y = 900;
                     88:   for (p.x=100; p.x < XMAX-50; p.x+=120)
                     89:        jelarc (p, r, r, Pt(p.x-r, p.y),
                     90:                Pt(p.x+r, p.y), F_XOR);
                     91: 
                     92:   request(KBD);
                     93:   wait(KBD);
                     94: }
                     95: .fi
                     96: .RE
                     97: .ft R
                     98: .SH SEE ALSO
                     99: circle(3L), ellipse(3L), globals(3R), jcircle(3L),
                    100: structures(3R), transform(3R/3L).

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