| 1 | package Convert::Color::XYZ; |
| 2 | |
| 3 | use 5.008009; |
| 4 | use strict; |
| 5 | use warnings; |
| 6 | use parent qw/Convert::Color/; |
| 7 | |
| 8 | use Convert::Color::RGB; |
| 9 | use List::Util qw/sum/; |
| 10 | |
| 11 | our $VERSION = '1.000'; |
| 12 | |
| 13 | use constant +{ ## no critic (Capitalization) |
| 14 | MAT_R => [ 3.2409699419045214, -1.5373831775700935, -0.49861076029300328 ], |
| 15 | MAT_G => [ -0.96924363628087983, 1.8759675015077207, 0.041555057407175613 ], |
| 16 | MAT_B => [ 0.055630079696993609, -0.20397695888897657, 1.0569715142428786 ], |
| 17 | |
| 18 | IMAT_X => [ 0.41239079926595948, 0.35758433938387796, 0.18048078840183429 ], |
| 19 | IMAT_Y => [ 0.21263900587151036, 0.71516867876775593, 0.072192315360733715 ], |
| 20 | IMAT_Z => [ 0.019330818715591851, 0.11919477979462599, 0.95053215224966058 ], |
| 21 | }; |
| 22 | |
| 23 | __PACKAGE__->register_color_space('xyz'); |
| 24 | |
| 25 | sub new { |
| 26 | my ($class, $x, $y, $z) = @_; |
| 27 | ($x, $y, $z) = split /,/s, $x unless defined $y; |
| 28 | bless [$x, $y, $z], $class |
| 29 | } |
| 30 | |
| 31 | sub X { shift->[0] } |
| 32 | sub Y { shift->[1] } |
| 33 | sub Z { shift->[2] } |
| 34 | |
| 35 | sub xyz { @{$_[0]} } |
| 36 | |
| 37 | sub _dot_product { |
| 38 | my ($x, $y) = @_; |
| 39 | sum map { $x->[$_] * $y->[$_] } 0 .. $#{$x} |
| 40 | } |
| 41 | |
| 42 | sub _from_linear { |
| 43 | my ($c) = @_; |
| 44 | $c <= 0.0031308 ? 12.92 * $c : 1.055 * $c ** (1 / 2.4) - 0.055 |
| 45 | } |
| 46 | |
| 47 | sub _to_linear { |
| 48 | my ($c) = @_; |
| 49 | $c <= 0.04045 ? $c / 12.92 : (($c + 0.055) / 1.055) ** 2.4 |
| 50 | } |
| 51 | |
| 52 | sub rgb { |
| 53 | my ($self) = @_; |
| 54 | map { _from_linear _dot_product $_, $self } MAT_R, MAT_G, MAT_B; |
| 55 | } |
| 56 | |
| 57 | sub new_rgb { |
| 58 | my $class = shift; |
| 59 | my $vector = [map { _to_linear $_ } @_]; |
| 60 | $class->new(map { _dot_product $_, $vector } IMAT_X, IMAT_Y, IMAT_Z) |
| 61 | } |
| 62 | |
| 63 | 1; |
| 64 | __END__ |
| 65 | |
| 66 | =encoding utf-8 |
| 67 | |
| 68 | =head1 NAME |
| 69 | |
| 70 | Convert::Color::XYZ - a color value in the CIE 1931 XYZ color space |
| 71 | |
| 72 | =head1 SYNOPSIS |
| 73 | |
| 74 | use Convert::Color::XYZ; |
| 75 | my $red = Convert::Color::XYZ->new(0.41239, 0.21264, 0.01933); |
| 76 | my $green = Convert::Color::XYZ->new('0.35758,0.71517,0.11919'); |
| 77 | |
| 78 | use Convert::Color; |
| 79 | my $blue = Convert::Color->new('xyz:0.18048,0.07219,0.95053'); |
| 80 | |
| 81 | say $red->X; # 0.41239 |
| 82 | say $red->Y; # 0.21264 |
| 83 | say $red->Z; # 0.01933 |
| 84 | say join ',', $blue->xyz; # 0.18048,0.07219,0.95053 |
| 85 | |
| 86 | =head1 DESCRIPTION |
| 87 | |
| 88 | Objects of this class represent colors in the CIE 1931 XYZ color space. |
| 89 | |
| 90 | Methods: |
| 91 | |
| 92 | =over |
| 93 | |
| 94 | =item Convert::Color::XYZ->B<new>(I<$x>, I<$y>, I<$z>) |
| 95 | |
| 96 | Construct a color from its components. |
| 97 | |
| 98 | =item Convert::Color::XYZ->B<new>(I<"$x,$y,$z">) |
| 99 | |
| 100 | Construct a color from a string. The string should contain the three |
| 101 | components, separated by commas. |
| 102 | |
| 103 | =item $xyz->B<X> |
| 104 | |
| 105 | =item $xyz->B<Y> |
| 106 | |
| 107 | =item $xyz->B<Z> |
| 108 | |
| 109 | Accessors for the three components of the color. |
| 110 | |
| 111 | =item $xyz->B<xyz> |
| 112 | |
| 113 | Returns the three components as a list. |
| 114 | |
| 115 | =back |
| 116 | |
| 117 | =head1 SEE ALSO |
| 118 | |
| 119 | L<Convert::Color> |
| 120 | |
| 121 | =head1 AUTHOR |
| 122 | |
| 123 | Marius Gavrilescu, E<lt>marius@ieval.roE<gt> |
| 124 | |
| 125 | =head1 COPYRIGHT AND LICENSE |
| 126 | |
| 127 | Copyright (C) 2015 by Marius Gavrilescu |
| 128 | |
| 129 | This library is free software; you can redistribute it and/or modify |
| 130 | it under the same terms as Perl itself, either Perl version 5.20.2 or, |
| 131 | at your option, any later version of Perl 5 you may have available. |
| 132 | |
| 133 | |
| 134 | =cut |