Bitmap/Flood fill: Difference between revisions
→{{header|Perl 6}}: Add a Perl 6 example
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This fills better than the Image::Imlib2 <tt>fill</tt> function the inner circle, since because of JPG compression and thanks to the <tt>$distparameter</tt>, it "sees" as black also pixel that are no more exactly black.
=={{header|Perl 6}}==
{{works with|Rakudo|2019.11}}
Using bits and pieces from various other bitmap tasks.
<lang perl6>class Pixel { has Int ($.R, $.G, $.B) }
class Bitmap {
has Int ($.width, $.height);
has Pixel @.data;
method pixel(
$i where ^$!width,
$j where ^$!height
--> Pixel
) is rw { @!data[$i + $j * $!width] }
}
role PPM {
method P6 returns Blob {
"P6\n{self.width} {self.height}\n255\n".encode('ascii')
~ Blob.new: flat map { .R, .G, .B }, self.data
}
}
sub load-ppm ( $ppm ) {
my $fh = $ppm.IO.open( :enc('ISO-8859-1') );
my $type = $fh.get;
my ($width, $height) = $fh.get.split: ' ';
my $depth = $fh.get;
Bitmap.new( width => $width.Int, height => $height.Int,
data => ( $fh.slurp.ords.rotor(3).map:
{ Pixel.new(R => $_[0], G => $_[1], B => $_[2]) } )
)
}
sub color-distance (Pixel $c1, Pixel $c2) {
sqrt( ( ($c1.R - $c2.R)² + ($c1.G - $c2.G)² + ($c1.B - $c2.B)² ) / ( 255 * sqrt(3) ) );
}
sub flood ($img, $x, $y, $c1) {
my $c2 = $img.pixel($x, $y);
my $max-distance = 10;
my @queue;
my %checked;
check($x, $y);
for @queue -> [$x, $y] {
$img.pixel($x, $y) = $c1.clone;
}
sub check ($x, $y) {
my $c3 = $img.pixel($x, $y);
if color-distance($c2, $c3) < $max-distance {
@queue.push: [$x,$y];
@queue.elems;
%checked{"$x,$y"} = 1;
check($x - 1, $y) if $x > 0 and %checked{"{$x - 1},$y"}:!exists;
check($x + 1, $y) if $x < $img.width - 1 and %checked{"{$x + 1},$y"}:!exists;
check($x, $y - 1) if $y > 0 and %checked{"$x,{$y - 1}"}:!exists;
check($x, $y + 1) if $y < $img.height - 1 and %checked{"$x,{$y + 1}"}:!exists;
}
}
}
my $infile = './Unfilled-Circle.ppm';
my Bitmap $b = load-ppm( $infile ) but PPM;
flood($b, 5, 5, Pixel.new(:255R, :0G, :0B));
flood($b, 5, 125, Pixel.new(:255R, :0G, :0B));
flood($b, 125, 5, Pixel.new(:255R, :0G, :0B));
flood($b, 125, 125, Pixel.new(:255R, :0G, :0B));
flood($b, 50, 50, Pixel.new(:0R, :0G, :255B));
my $outfile = open('./Bitmap-flood-perl6.ppm', :w, :bin);
$outfile.write: $b.P6;
</lang>
See output image [https://github.com/thundergnat/rc/blob/master/img/Bitmap-flood-perl6.png Bitmap-flood-perl6 ] (offsite image file, converted to PNG for ease of viewing)
=={{header|Phix}}==
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