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package Graphics::ColorDeficiency;
use Graphics::ColorObject;
use Graphics::ColorDeficiency::Data;
@ISA = ('Graphics::ColorObject');
$VERSION = 0.05;
sub Clone {
my ($self) = @_;
my ($r,$g,$b) = $self->asRGB;
return Graphics::ColorDeficiency->newRGB($r, $g, $b);
}
sub asProtanomaly {
my ($self, $ratio) = @_;
$ratio = 0.5 unless defined $ratio;
my $temp = $self->asProtanopia;
return $self->asMix($temp, $ratio);
}
sub asDeuteranomaly {
my ($self, $ratio) = @_;
$ratio = 0.5 unless defined $ratio;
my $temp = $self->asDeutanopia;
return $self->asMix($temp, $ratio);
}
sub asTritanomaly {
my ($self, $ratio) = @_;
$ratio = 0.5 unless defined $ratio;
my $temp = $self->asTritanopia;
return $self->asMix($temp, $ratio);
}
sub asProtanopia {
return shift->asHash(0);
}
sub asDeutanopia {
return shift->asHash(1);
}
sub asTritanopia {
return shift->asHash(2);
}
sub asTypicalMonochrome {
my ($self) = @_;
my $val = $self->asGrey2;
my ($h1, $s1, $v1) = $self->asHSV;
my $temp = Graphics::ColorObject->newRGB($val, $val, $val);
my ($h2, $s2, $v2) = $temp->asHSV;
$temp->setHSV($h2, $s2, ($v1+$v2)/2);
return $temp;
}
sub asAtypicalMonochrome {
my ($self, $ratio) = @_;
$ratio = 0.2 unless defined $ratio;
my $temp = $self->asTypicalMonochrome;
return $self->asMix($temp, 1 - $ratio);
}
sub asHash {
my ($self, $id) = @_;
my ($r, $g, $b) = $self->asRGB();
my ($lo_r, $hi_r) = $self->getColorBounds($r);
my ($lo_r_rat, $hi_r_rat) = $self->getMixRatios($r, $hi_r, $lo_r);
my ($lo_g, $hi_g) = $self->getColorBounds($g);
my ($lo_g_rat, $hi_g_rat) = $self->getMixRatios($g, $hi_g, $lo_g);
my ($lo_b, $hi_b) = $self->getColorBounds($b);
my ($lo_b_rat, $hi_b_rat) = $self->getMixRatios($b, $hi_b, $lo_b);
my $lo_col = Graphics::ColorObject->newRGB($lo_r, $lo_g, $lo_b);
my $hi_col = Graphics::ColorObject->newRGB($hi_r, $hi_g, $hi_b);
my $from_lo = $Graphics::ColorDeficiency::Data::HASH->{substr(lc $lo_col->asHex,1)}[$id];
my $from_hi = $Graphics::ColorDeficiency::Data::HASH->{substr(lc $hi_col->asHex,1)}[$id];
my ($f_l_r, $f_l_g, $f_l_b) = map{hex($_) / 255} ($from_lo =~ /../g);
my ($f_h_r, $f_h_g, $f_h_b) = map{hex($_) / 255} ($from_hi =~ /../g);
my $r_out = ($f_l_r * $lo_r_rat) + ($f_h_r * $hi_r_rat);
my $g_out = ($f_l_g * $lo_g_rat) + ($f_h_g * $hi_g_rat);
my $b_out = ($f_l_b * $lo_b_rat) + ($f_h_b * $hi_b_rat);
return Graphics::ColorObject->newRGB($r_out, $g_out, $b_out);
}
sub asMix {
my ($self, $mix, $rat2) = @_;
my $rat1 = 1 - $rat2;
my ($r1, $g1, $b1) = $self->asRGB();
my ($r2, $g2, $b2) = $mix->asRGB();
return Graphics::ColorDeficiency->newRGB( ($r1*$rat1)+($r2*$rat2), ($g1*$rat1)+($g2*$rat2), ($b1*$rat1)+($b2*$rat2) );
}
sub getColorBounds {
my ($self, $val) = @_;
$val *= 10;
my ($lo, $hi) = (0, 10);
for(my $i=0; $i<=10; $i+=2){
$lo = $i if $val >= $i;
$hi = $i if $val <= $i && $i < $hi;
}
return ($lo/10, $hi/10);
}
sub getMixRatios {
my ($self, $val, $hi, $lo) = @_;
return (0.5, 0.5) if ($hi == $val);
$r1 = ($val - $lo) / 0x33;
return ($r1, 1-$r1);
}
=head1 NAME
Graphics::ColorDeficiency - Color Deficiency Simulation
=head1 SYNOPSIS
use Graphics::ColorDeficiency;
my $col = Graphics::ColorDeficiency->newRGB(0.5, 0.7, 1);
my $col2 = $col->asProtanopia;
print $col2->asHex;
=head1 DESCRIPTION
This module allows easy transformation of colors for color deficiency
simulation. All the known and theorhetical color deficiencies are
represented here, with the exception of 4-cone vision (tetrachromatism).
Each of the transformation methods returns a C<Graphics::ColorObject> object,
with the internal color values set. This can then be used to return the
color in many different formats (see the C<Graphics::ColorObject> manpage).
=head1 METHODS
=over 4
=item C<asProtanopia()>
=item C<asDeutanopia()>
=item C<asTritanopia()>
The three dichromat methods return a C<Graphics::ColorObject> object,
simulated for the three dichromatic vision modes.
=item C<asProtanomaly( $amount )>
=item C<asDeuteranomaly( $amount )>
=item C<asTritanomaly( $amount )>
The three anomalous trichromat methods return a C<Graphics::ColorObject> object,
simulated for the three anomalous trichromatic vision modes. The optional
C<$amount> agrument allows you to specify the severity of anomaly, ranging
from 0 (trichromatic) to 1 (dichromatic). If not specified, it defaults to
0.5.
=item C<asTypicalMonochrome()>
Returns a C<Graphics::ColorObject> object in Typical Monochromatic (Rod
Monochromat) mode.
=item C<asAtypicalMonochrome( $amount )>
Returns a C<Graphics::ColorObject> object in Atypical Monochromatic (Cone
Monochromat) mode. The amount specified in C<$amount> can vary between 1
(trichromatic) and 0 (monochromatic). The default is 0.2 (four fifths gray).
=item C<Clone()>
Clones the current object, returning a C<Graphics::ColorDeficiency> object
with the same color values as the current object.
=item C<asMix( $color, $amount )>
Returns a new C<Graphics::ColorDeficiency>, consisting of the current color
values, mixed with the values of the C<$color> object. C<$amount> specifies
the amount of the new color to mix in, from 0 (which is equal to
C<$self.Clone()>), up to 1 (which is equal to C<$color.Clone()>). The mix
is a linear RGB interpolation.
This method is used internally.
=back
=head1 AUTHOR
Copyright (C) 2003 Cal Henderson <cal@iamcal.com>
=head1 SEE ALSO
L<Graphics::ColorObject>
L<http://www.iamcal.com/toys/colors/>
=cut
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