Hossein has asked for the wisdom of the Perl Monks concerning the following question:

Hi,

I have an object. this object has several other objects linked to it.

I need to draw the main object in the center and all the rest ( < 20 ) in a circular around the main object.

How do/should I do it?

(I think of sin/cos)

Thanks :)

/Hossein

Replies are listed 'Best First'.
Re: draw objects in circle
by choroba (Cardinal) on Aug 27, 2013 at 09:19 UTC
    Yes, sin and cos are the functions you need. 
    #!/usr/bin/perl
use warnings;
use strict;

use Tk;

use constant PI => 4 * atan2(1, 1);

my ($center_x, $center_y) = (25, 25);
my $radius = 20;
my $object_count = 19;

my $mw = 'MainWindow'->new(-title  => 'Objects in circle');
$mw->Label(-text => 'Center')->grid(-row    => $center_x,
                                    -column => $center_y,
                                   );
my @objects = map "Object $_", 1 .. $object_count;
my $step = 2 * PI / (1 + $#objects);
for my $i (0 .. $#objects) {
    my $angle = $i * $step;
    my $x = $center_x + $radius * cos $angle;
    my $y = $center_y + $radius * sin $angle;
    $mw->Label(-text => $objects[$i])->grid(-row    => $y,
                                            -column => $x,
                                           );
}

MainLoop();

    [download]
    لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
[reply]
[d/l]

      Thank you :)

      /Hossein
[reply]
Re: draw objects in circle
by hdb (Monsignor) on Aug 27, 2013 at 09:00 UTC

    If you are asking how to calculate x/y coordinates for the positions of your objects on a circle, then sin and cos are the way to go. Multiply the results with the radius of desire.

[reply]
[d/l]

Back to Seekers of Perl Wisdom