File Coverage

blib/lib/Term/Colormap.pm

Criterion	Covered	Total	%
statement	73	75	97.3
branch	16	16	100.0
condition	7	7	100.0
subroutine	15	16	93.7
pod	8	8	100.0
total	119	122	97.5

package Term::Colormap;

use 5.006;
use strict;
use warnings FATAL => 'all';
use Exporter 'import';
use Scalar::Util qw( looks_like_number );

our $VERSION = '0.15';

our @EXPORT_OK = qw(
    colorbar
    colormap
    color2rgb
    rgb2color
    print_colored
    print_colored_text
    color_table
    add_mapping
);

my $color_mapping = {};

# http://www.calmar.ws/vim/256-xterm-24bit-rgb-color-chart.html
$color_mapping->{rainbow} = [
    1,    # Red
    196, 202, 208, 214, 220, 226,
    11,   # Yellow
    190, 154, 118,  82,  46,
    10,   # Green
    47,   48,  49,  50,  51,
    14,   # Cyan
    45,   39,  33,  27,  21,
    12,   # Blue
    57,   93, 129, 165, 201,
    5,    # Magenta
];

$color_mapping->{primary} = [
    # Black, Red, Green, Yellow, Blue, Magenta, Cyan, Off-White
    0,1,2,3,4,5,6,7
];

$color_mapping->{bright} = [
    # Gray, Bright Red, Bright Green, Bright Yellow,
    8,9,10,11,
    # Bright Blue, Bright Magenta, Bright Cyan, White
    12,13,14,15
];

$color_mapping->{ash} = [
    # Black <--------------------------------> Gray
    232,233,234,235,236,237,238,239,240,241,242,243,
];

$color_mapping->{snow} = [
    # Gray <--------------------------------> White
    244,245,246,247,248,249,250,251,252,253,254,255,
];

$color_mapping->{gray} = [ @{ $color_mapping->{ash} }, @{ $color_mapping->{snow} } ];

$color_mapping->{'blue-cyan-green'} = [
    # Blue <------------------ Cyan -----------------> Green
    17,18,19,20,21,27,33,39,45,51,50,49,48,47,46,40,34,28,22
];

$color_mapping->{'red-pink-yellow'} = [
    # Red <------------------ Pink ------------------------> Yellow
    196,197,198,199,200,201,207,213,219,225,231,230,229,228,227,226
];

$color_mapping->{'green-orange-pink-blue'} = [
    # Green <-------- Orange -------- Pink --------------> Blue
    28,64,100,136,172,208,209,210,211,212,213,177,141,105,69,33
];

# 0-255
my $color2rgb = [
    '000000', '800000', '008000', '808000', '000080', '800080',
    '008080', 'c0c0c0', '808080', 'ff0000', '00ff00', 'ffff00',
    '0000ff', 'ff00ff', '00ffff', 'ffffff', '000000', '00005f',
    '000087', '0000af', '0000d7', '0000ff', '005f00', '005f5f',
    '005f87', '005faf', '005fd7', '005fff', '008700', '00875f',
    '008787', '0087af', '0087d7', '0087ff', '00af00', '00af5f',
    '00af87', '00afaf', '00afd7', '00afff', '00d700', '00d75f',
    '00d787', '00d7af', '00d7d7', '00d7ff', '00ff00', '00ff5f',
    '00ff87', '00ffaf', '00ffd7', '00ffff', '5f0000', '5f005f',
    '5f0087', '5f00af', '5f00d7', '5f00ff', '5f5f00', '5f5f5f',
    '5f5f87', '5f5faf', '5f5fd7', '5f5fff', '5f8700', '5f875f',
    '5f8787', '5f87af', '5f87d7', '5f87ff', '5faf00', '5faf5f',
    '5faf87', '5fafaf', '5fafd7', '5fafff', '5fd700', '5fd75f',
    '5fd787', '5fd7af', '5fd7d7', '5fd7ff', '5fff00', '5fff5f',
    '5fff87', '5fffaf', '5fffd7', '5fffff', '870000', '87005f',
    '870087', '8700af', '8700d7', '8700ff', '875f00', '875f5f',
    '875f87', '875faf', '875fd7', '875fff', '878700', '87875f',
    '878787', '8787af', '8787d7', '8787ff', '87af00', '87af5f',
    '87af87', '87afaf', '87afd7', '87afff', '87d700', '87d75f',
    '87d787', '87d7af', '87d7d7', '87d7ff', '87ff00', '87ff5f',
    '87ff87', '87ffaf', '87ffd7', '87ffff', 'af0000', 'af005f',
    'af0087', 'af00af', 'af00d7', 'af00ff', 'af5f00', 'af5f5f',
    'af5f87', 'af5faf', 'af5fd7', 'af5fff', 'af8700', 'af875f',
    'af8787', 'af87af', 'af87d7', 'af87ff', 'afaf00', 'afaf5f',
    'afaf87', 'afafaf', 'afafd7', 'afafff', 'afd700', 'afd75f',
    'afd787', 'afd7af', 'afd7d7', 'afd7ff', 'afff00', 'afff5f',
    'afff87', 'afffaf', 'afffd7', 'afffff', 'd70000', 'd7005f',
    'd70087', 'd700af', 'd700d7', 'd700ff', 'd75f00', 'd75f5f',
    'd75f87', 'd75faf', 'd75fd7', 'd75fff', 'd78700', 'd7875f',
    'd78787', 'd787af', 'd787d7', 'd787ff', 'd7af00', 'd7af5f',
    'd7af87', 'd7afaf', 'd7afd7', 'd7afff', 'd7d700', 'd7d75f',
    'd7d787', 'd7d7af', 'd7d7d7', 'd7d7ff', 'd7ff00', 'd7ff5f',
    'd7ff87', 'd7ffaf', 'd7ffd7', 'd7ffff', 'ff0000', 'ff005f',
    'ff0087', 'ff00af', 'ff00d7', 'ff00ff', 'ff5f00', 'ff5f5f',
    'ff5f87', 'ff5faf', 'ff5fd7', 'ff5fff', 'ff8700', 'ff875f',
    'ff8787', 'ff87af', 'ff87d7', 'ff87ff', 'ffaf00', 'ffaf5f',
    'ffaf87', 'ffafaf', 'ffafd7', 'ffafff', 'ffd700', 'ffd75f',
    'ffd787', 'ffd7af', 'ffd7d7', 'ffd7ff', 'ffff00', 'ffff5f',
    'ffff87', 'ffffaf', 'ffffd7', 'ffffff', '080808', '121212',
    '1c1c1c', '262626', '303030', '3a3a3a', '444444', '4e4e4e',
    '585858', '626262', '626262', '767676', '808080', '8a8a8a',
    '949494', '9e9e9e', 'a8a8a8', 'b2b2b2', 'bcbcbc', 'c6c6c6',
    'd0d0d0', 'dadada', 'e4e4e4', 'eeeeee',
];

my $color = 0;
my $rgb2color = { map { $_ => $color++ } @$color2rgb };

sub add_mapping {
    my ($name, $mapping) = @_;
    $color_mapping->{$name} = $mapping;
}

sub rgb2color {
    my ($rgb) = @_;

    my $original_rgb = $rgb;
    $rgb =~ s|^#||;
    $rgb = lc($rgb);
    if ( $rgb =~ m|[^a-f0-9]| ) {
        die "Invalid RGB color '$original_rgb'"
    }

    unless (defined $rgb2color->{$rgb}) {
        $rgb2color->{ $rgb } = $rgb2color->{ _get_nearest_color($rgb) };
    }

    return $rgb2color->{$rgb};
}

sub _get_nearest_color {
    my ($rgb) = @_;
    my $closest = 3 * (scalar @$color2rgb);
    my $best_color;
    for my $color ( @$color2rgb ) {
        my $dist = _color_distance($rgb, $color);
        if ($dist < $closest) {
            $best_color = $color;
            $closest = $dist;
        }
    }
    return $best_color;
}

sub _color_distance {
    my ($rgb0, $rgb1) = @_;
    my $rgb = $rgb0 . $rgb1;
    my ($r0, $g0, $b0,
        $r1, $g1, $b1) = map { hex } ( $rgb =~ m/../g );
    return abs($r1 - $r0)
         + abs($g1 - $g0)
         + abs($b1 - $b0);
}

sub colormap {
    my ($name) = @_;

    if ( exists $color_mapping->{ lc($name) } ) {
         return $color_mapping->{ lc($name) };
    }

    die "Invalid colormap name : '$name'\n" .
        "Choose one of ( " . ( join ", ", sort keys %$color_mapping ) . " )\n";

}

sub color2rgb {
    my ($color) = @_;

    if ($color < 0 or $color >= scalar @$color2rgb) {
        die "Invalid color value : $color";
    }

    return $color2rgb->[$color];
}


sub colorbar {
    my ($colors, $width, $orientation ) = @_;

    $width ||= 2;
    $orientation ||= 'h'; # Horizontal

    for my $color (@$colors) {
        print_colored( $color, ' 'x$width );
        unless ('h' eq substr(lc($orientation),0,1)) {
            print "\n";
        }
    }
    print "\n";
}

sub color_table {
    my ($name) = @_;
    my $mapping = colormap($name);

    my $header = "color     number   rgb";
    my $indent = (length($header) - length($name) - 1) / 2; # spaces around name

    my $ii = int($indent);
    print '-'x$ii . " $name " . '-'x$ii;
    print '-' if ($ii < $indent);
    print "\n";

    print $header . "\n";
    for my $color (@$mapping) {
        print_colored($color, ' 'x8 );
        print sprintf("   %3d   ", $color) . color2rgb($color) . "\n";
    }
    print "\n";
}

sub print_colored {
    my ($color, $txt) = @_;
    _print_with_color('bg',$color,$txt);
}

sub print_colored_text {
    my ($color, $txt) = @_;
    _print_with_color('fg',$color,$txt);
}

sub _print_with_color {
    my ($bg_or_fg, $color, $txt) = @_;

    my $code = $bg_or_fg eq 'fg' ? 38 : 48;
    print "\x1b[${code};5;${color}m" . $txt . "\x1b[0m";
}

1; # End of Term::Colormap

__END__