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