Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Sometimes I use Perl to generate cheesy graphics to visualize math or geometry concepts. The latest effort was rather pleasing despite the cheese so I offer it here.

This program calculates and displays Voronoi neighborhoods. The neighborhoods wrap so the image (if it were one) is tileable. There are many examples of Voronoi spots found in nature, quite an interesting subject (search Google).

Any suggestions for a better @CHARS to use?


#!/usr/bin/perl use strict; my @CHARS = split('', ' .,-+*$&#@'); my ($XMIN, $XMAX) = qw(0 1); my ($YMIN, $YMAX) = qw(0 1); my ($ROWS, $COLS) = qw(40 80); my $POINTS = 8; my $REPEAT = 0; my $xfact = ($XMAX - $XMIN) / $COLS; my $yfact = ($YMAX - $YMIN) / $ROWS; my (@screen, @xs, @ys); # Pick some random points for (0..$POINTS-1) { my ($xrand, $yrand) = (rand(), rand()); for my $xoffset (-1..1) { for my $yoffset (-1..1) { push (@xs, $xrand + $xoffset); push (@ys, $yrand + $yoffset); } } } # Calculate screen for my $yi (0..$ROWS-1) { my $y = $YMIN + $yi * $yfact; for my $xi (0..$COLS-1) { my $x = $XMIN + $xi * $xfact; my ($best, $good) = closest($x, $y, \@xs, \@ys); $screen[$xi][$yi] = $CHARS[int(10 * ($best / $good))]; } } # Print screen for (0..$REPEAT) { for my $yi (0..$ROWS-1) { for my $xi (0..$COLS-1) { print "$screen[$xi][$yi]"; } print "\n"; } } #----------------------------------------------------------- sub closest { my ($x, $y, $xs, $ys) = @_; my ($dist, $best, $good); for (my $i = 0; $i < @$xs; $i++) { $dist = sqrt(($x - $xs->[$i])**2 + ($y - $ys->[$i])**2); if ($i == 0 || $dist < $best) { ($good, $best) = ($best, $dis +t); } elsif ($i == 1 || $dist < $good) { $good = $dist; } } return ($best, $good); }

In reply to Perl Spots by YuckFoo

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others taking refuge in the Monastery: (4)
    As of 2018-07-21 06:18 GMT
    Find Nodes?
      Voting Booth?
      It has been suggested to rename Perl 6 in order to boost its marketing potential. Which name would you prefer?

      Results (444 votes). Check out past polls.