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|
use Cairo;
use Fornax::Hex2RGB;
subset File of Str where *.IO.f;
subset Directory of Str where *.IO.d;
#| 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 $input, #= fornax format file (solved)
Directory :$output = '/tmp/output', #= output directory (existing)
Int :$frame-rate = 1, #= frame rate
Bool :$verbose = True, #= verbosity
) is export {
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 $VIS = '-';
constant $CUR = '@';
constant %CANVAS = :1920width, :1080height;
# Colors.
constant %C = (
black => "#000000",
white => "#ffffff",
green => "#aecf90",
cyan => "#c0efff",
red => "#f2b0a2",
pointer => "#093060"
).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>;
for @lines.skip.kv -> $idx, $iter is rw {
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<white>;
.rectangle(0, 0, %CANVAS<width>, %CANVAS<height>);
.fill;
.stroke;
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 {
when $cell eq $VIS|$CUR {
.rgba: |%C<cyan>, 0.64;
.rgba: |%C<green>, 0.96 if $status == Completed;
.rgba: |%C<red>, 0.96 if $status == Blocked;
}
when $cell eq $BLOK { .rgba: |%C<black>, 0.48 }
when $cell eq $DEST { .rgb: |%C<green> }
default { .rgba: |%C<black>, 0.08 }
}
.fill :preserve;
.rgb: |%C<black>;
.rectangle: |@target;
.stroke;
}
}
}
.write_png("%s/%08d.png".sprintf: $output, $idx);
.finish;
}
}
put "[fornax] Generated images." if $verbose;
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"
-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>; }
|