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|
use Cairo;
use Fornax::Hex2RGB;
subset File of Str where *.IO.f;
#| Parses fornax format file to extract metadata.
grammar Metadata {
rule TOP { <rows> <cols> }
token rows { 'rows:' <(\d+)> }
token cols { 'cols:' <(\d+)> }
}
proto MAIN(|) is export { unless so @*ARGS { put $*USAGE; exit }; {*} }
#| Collection of tools to visualize Path Finding Algorithms
multi sub MAIN(
File $input, #= fornax format file (solved)
Int() :$batch = 4, #= number of iterations to process at once (default: 4)
Int() :fps($frame-rate) = 1, #= frame rate for video solution (default: 1)
Bool :$skip-video, #= skip video solution
Bool :$verbose = True, #= verbosity (default: True)
) is export {
my IO() $output = "%s/fornax-%s".sprintf(
'/tmp', ('a'...'z', 'A'...'Z', 0...9).roll(8).join
);
mkdir $output;
die "Output directory doesn't exist" unless $output.d;
put "[fornax] Output: '$output'" if $verbose;
my Str @lines = $input.IO.lines;
my Int() %meta{Str} = Metadata.parse(@lines.first).Hash
or die "Cannot parse metadata";
# Cells as defined by fornax format.
constant $PATH = '.';
constant $BLOK = '#';
constant $DEST = '$';
constant $STRT = '^';
constant $VIS = '-';
constant $CUR = '@';
constant $CURPATH = '~';
constant %CANVAS = :1920width, :1080height;
# Colors.
constant %C = (
bg-main => "#ffffff",
red-subtle-bg => "#f2b0a2",
blue-subtle-bg => "#b5d0ff",
cyan-subtle-bg => "#c0efff",
green-subtle-bg => "#aecf90",
fg-main => "#000000",
fg-special-cold => "#093060",
fg-special-warm => "#5d3026",
fg-special-mild => "#184034",
fg-special-calm => "#61284f",
).map: {.key => hex2rgb(.value)};
# Every cell must be square. Get the maximum width, height and use
# that to decide which is to be used.
my Int %cell = width => %CANVAS<width> div %meta<cols>,
height => %CANVAS<height> div %meta<rows>;
my Int $side;
my Int %excess = :0width, :0height;
# Consider width if cells with dimension (width * width) fit
# within the canvas, otherwise consider the height.
if (%cell<width> * %meta<rows>) < %CANVAS<height> {
%excess<height> = %CANVAS<height> - (%cell<width> * %meta<rows>);
$side = %cell<width>;
} else {
%excess<width> = %CANVAS<width> - (%cell<height> * %meta<cols>);
$side = %cell<height>;
}
enum IterStatus <Walking Blocked Completed>;
my Promise @p;
for @lines.skip.kv -> $idx, $iter is rw {
# Wait until all scheduled jobs are finished, then empty the
# array and continue.
if @p.elems == $batch {
await @p;
@p = [];
}
push @p, start {
my IterStatus $status;
given $iter.substr(0, 1) {
when '|' { $status = Completed }
when '!' { $status = Blocked }
default { $status = Walking }
};
# Remove marker.
$iter .= substr(1) if $status == Completed|Blocked;
put "[fornax] $idx $iter $status" if $verbose;
my @grid = $iter.comb.rotor: %meta<cols>;
warn "Invalid grid: $idx $iter $status" unless @grid.elems == %meta<rows>;
given Cairo::Image.create(
Cairo::FORMAT_ARGB32, %CANVAS<width>, %CANVAS<height>
) {
given Cairo::Context.new($_) {
# Paint the entire canvas white.
.rgb: |%C<bg-main>;
.rectangle(0, 0, %CANVAS<width>, %CANVAS<height>);
.fill;
for ^%meta<rows> -> $r {
for ^%meta<cols> -> $c {
my Int @target = %excess<width> div 2 + $c * $side,
%excess<height> div 2 + $r * $side,
$side, $side;
.rectangle: |@target;
given @grid[$r][$c] -> $cell {
# According to the format, current
# position may be prioritized over
# Destination symbol so we colorize it
# according to $status.
when $cell eq $CUR {
.rgba: |%C<fg-special-cold>, 0.56;
.rgba: |%C<fg-special-mild>, 0.72 if $status == Completed;
.rgba: |%C<fg-special-warm>, 0.72 if $status == Blocked;
}
when $cell eq $CURPATH {
.rgba: |%C<blue-subtle-bg>, 0.84;
.rgba: |%C<green-subtle-bg>, 0.96 if $status == Completed;
.rgba: |%C<red-subtle-bg>, 0.96 if $status == Blocked;
}
when $cell eq $VIS {
.rgba: |%C<cyan-subtle-bg>, 0.72;
}
when $cell eq $BLOK { .rgba: |%C<fg-main>, 0.56 }
when $cell eq $STRT|$DEST { .rgba: |%C<fg-special-mild>, 0.72 }
default { .rgba: |%C<fg-main>, 0.08 }
}
.fill :preserve;
.rgb: |%C<fg-main>;
.stroke;
}
}
}
.write_png("%s/%08d.png".sprintf: $output, $idx);
.finish;
}
}
}
# Wait for remaining jobs to finish.
await @p;
put "[fornax] Generated images." if $verbose;
unless $skip-video {
put "[fornax] Creating a slideshow." if $verbose;
my Str $log-level = $verbose ?? "info" !! "error";
run «ffmpeg -loglevel "$log-level" -r "$frame-rate" -i "$output/\%08d.png"
-vf 'tpad=stop_mode=clone:stop_duration=4'
-vcodec libx264 -crf 28 -pix_fmt yuv420p "$output/solution.mp4"»;
}
put "[fornax] Output: '$output'";
}
multi sub MAIN(
Bool :$version #= print version
) { say "Fornax v" ~ $?DISTRIBUTION.meta<version>; }
|