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package HexGrid::Path;
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use v5.30;
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use Moo;
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use MooX::Aliases;
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use Data::Dumper;
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use feature "signatures";
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no warnings "experimental::signatures";
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has tiles => (is => 'rw', default => sub { [] });
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has id => (is => 'ro', required => 1);
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has style => (is => 'rw', default => sub { {} });
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has colour => (is => 'rw', alias => 'color', default => 'blue');
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has css_class => (is => 'rw');
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# Class
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my $DEFAULT_WIDTH = 5;
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sub get_edge_direction($tile1, $tile2)
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{
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my $nw_diff = $tile2->nw - $tile1->nw;
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my $sw_diff = $tile2->sw - $tile1->sw;
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return $HexGrid::DIR{nw} if $nw_diff == 1 && $sw_diff == 0;
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return $HexGrid::DIR{sw} if $nw_diff == 0 && $sw_diff == 1;
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return $HexGrid::DIR{s} if $nw_diff == -1 && $sw_diff == 1;
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return $HexGrid::DIR{se} if $nw_diff == -1 && $sw_diff == 0;
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return $HexGrid::DIR{ne} if $nw_diff == 0 && $sw_diff == -1;
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return $HexGrid::DIR{n} if $nw_diff == 1 && $sw_diff == -1;
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#TODO: should die here, to be caught/bubbled in render...
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}
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sub curve_path($x1, $y1, $qx, $qy, $x2, $y2)
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{
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return "M $x1,$y1 Q $qx,$qy $x2,$y2";
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}
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# Instance
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sub render($this, $grid, $svg)
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{
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return unless @{$this->tiles};
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my $g = $svg->g(id => $this->id, class => $this->css_class);
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my ($x1, $x2, $y1, $y2);
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my $current_tile = shift @{$this->tiles};
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unless (@{$this->tiles})
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{
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my ($cx, $cy) = $grid->coords_of_centre($current_tile->nw, $current_tile->sw);
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$g->circle(cx => $cx, cy => $cy,
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r => $this->{style}{'stroke-width'} // $DEFAULT_WIDTH,
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fill => $this->colour, style => $this->style, class => $this->css_class);
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return;
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}
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my $previous_tile = $current_tile;
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$current_tile = shift @{$this->tiles};
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my $next_edge = get_edge_direction($previous_tile, $current_tile);
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($x1, $y1) = $grid->coords_of_centre($previous_tile->nw, $previous_tile->sw);
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($x2, $y2) = $grid->coords_of_edge($previous_tile->nw, $previous_tile->sw, $next_edge);
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$g->line(x1 => $x1, y1 => $y1, x2 => $x2, y2 => $y2,
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stroke => $this->colour, style => $this->style, class => $this->css_class);
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my $previous_edge; # not defined yet
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my $next_tile; # not defined yet
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while(@{$this->tiles})
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{
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$next_tile = shift @{$this->tiles};
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$previous_edge = -$next_edge;
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$next_edge = get_edge_direction($current_tile, $next_tile);
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($x1,$y1) = $grid->coords_of_edge($current_tile->nw, $current_tile->sw, $previous_edge);
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my ($qx,$qy) = $grid->coords_of_centre($current_tile->nw, $current_tile->sw);
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($x2,$y2) = $grid->coords_of_edge($current_tile->nw, $current_tile->sw, $next_edge);
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$g->path(d => curve_path($x1,$y1, $qx,$qy, $x2,$y2), fill => 'transparent',
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stroke => $this->colour, style => $this->style, class => $this->css_class
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);
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$previous_tile = $current_tile;
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$current_tile = $next_tile;
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}
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# When loop is done (or if it was empty) $current_tile is the last tile
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# $next_edge will be the last used edge, so use it's opposite for the source of last line
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($x1, $y1) = $grid->coords_of_edge($current_tile->nw, $current_tile->sw, -$next_edge);
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($x2, $y2) = $grid->coords_of_centre($current_tile->nw, $current_tile->sw);
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$g->line(x1 => $x1, y1 => $y1, x2 => $x2, y2 => $y2,
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stroke => $this->colour, style => $this->style, class => $this->css_class);
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}
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1;
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