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Re: Ordering Colours Problem

by choroba (Archbishop)
on Mar 05, 2021 at 12:47 UTC ( #11129158=note: print w/replies, xml ) Need Help??


in reply to Ordering Colours Problem

Based on Math behind Colourspace Conversions, I was able to at least sort the colours:
#!/usr/bin/perl use warnings; use strict; use feature qw{ say }; sub hue { my ($colour) = @_; my %rgb; @rgb{qw{ red green blue }} = map hex($_) / 255, $colour =~ /^#(..) +(..)(..)/; my @order = sort { $rgb{$a} <=> $rgb{$b} } keys %rgb; my $hue = {red => sub { 0 + $rgb{green} - $rgb{blue}}, green => sub { 2 + $rgb{blue} - $rgb{red} }, blue => sub { 4 + $rgb{red} - $rgb{green} } }->{ $order[2] }->(); my $d = $rgb{ $order[2] } - $rgb{ $order[0]}; return 0 if 0 == $d; $hue /= $d; $hue *= 60; $hue += 360 if $hue < 0; return $hue } my @colours = do { no warnings 'qw'; qw( #000000 #716373 #704A2B #AF7E45 #963049 #AA2261 #B24551 #E6212E #FF0000 #001200 #FFDE72 #F55B73 + ) }; my %hue = map { $_ => hue($_) } @colours; my @sorted = sort { $hue{$a} <=> $hue{$b} } keys %hue; say "@sorted";
The black/white problem is not solved here, so feel free to expand as you need.
map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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