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termcol: lay out 256-colour table by h/s/v
[sheet.git]
/
Shiar_Sheet
/
Colour.pm
diff --git
a/Shiar_Sheet/Colour.pm
b/Shiar_Sheet/Colour.pm
index 7ea68e9dcf63bd3874facf8e8a89f068d52ba213..cedfdfb9e31aa722ff8027657fba1b97c455fb26 100644
(file)
--- a/
Shiar_Sheet/Colour.pm
+++ b/
Shiar_Sheet/Colour.pm
@@
-4,13
+4,15
@@
use strict;
use warnings;
use List::Util qw( min max );
use warnings;
use List::Util qw( min max );
-our $VERSION = '1.0
1
';
+our $VERSION = '1.0
2
';
# ITU-R recommendation 601 luma co-efficients
our $kr = .299;
our $kb = .114;
our $kg = 1 - $kb - $kr;
# ITU-R recommendation 601 luma co-efficients
our $kr = .299;
our $kb = .114;
our $kg = 1 - $kb - $kr;
+my $PI = 2 * atan2 1, 0;
+
sub new {
my $class = shift;
my @rgb = @_ >= 3 ? @_ : (map {hex} $_[0] =~ /(..)/g);
sub new {
my $class = shift;
my @rgb = @_ >= 3 ? @_ : (map {hex} $_[0] =~ /(..)/g);
@@
-39,6
+41,12
@@
sub luminance {
return $r*$kr + $g*$kg + $b*$kb;
}
return $r*$kr + $g*$kg + $b*$kb;
}
+sub hue {
+ my ($r, $g, $b) = @{ $_[0] };
+ my $hue = atan2 sqrt(3) * ($g - $b), $r*2 - $g - $b;
+ return ($hue + $PI) / $PI / 2; # 0 .. 1
+}
+
sub rgb24 {
my $str = '';
$str .= sprintf '%X', min($_ / 17 + .5, 15) for @{ $_[0] };
sub rgb24 {
my $str = '';
$str .= sprintf '%X', min($_ / 17 + .5, 15) for @{ $_[0] };