27 |
_BOARD_ |
_BOARD_ |
28 |
|
|
29 |
my @board = map { split(//) } split(/\n/, $board); |
my @board = map { split(//) } split(/\n/, $board); |
30 |
|
my @trace; |
31 |
|
|
32 |
# line length |
# line length |
33 |
my $ll = 8 * 2 + 1; |
my $ll = 8 * 2 + 1; |
34 |
|
|
35 |
|
my @step_name = ( qw/right down left up/ ); |
36 |
|
my @move_by = ( 1, $ll, -1, -$ll ); |
37 |
|
my $step = 0; # right |
38 |
|
|
39 |
|
# offset 0, top-left corner |
40 |
|
my $pos = 0; |
41 |
|
|
42 |
|
# unknown trace position |
43 |
|
my $unknown = ' '; |
44 |
|
|
45 |
sub draw { |
sub draw { |
|
my @board = @_; |
|
46 |
my $o = 0; |
my $o = 0; |
47 |
my $out; |
my $out; |
48 |
while ( $o < $#board ) { |
while ( $o < $#board ) { |
49 |
$out .= join('', @board[ $o .. $o + $ll - 1 ]) . "\n"; |
$out .= join('', @board[ $o .. $o + $ll - 1 ]); |
50 |
|
$out .= ' '; |
51 |
|
$out .= join('', @trace[ $o .. $o + $ll - 1 ]); |
52 |
|
$out .= "\n"; |
53 |
$o += $ll; |
$o += $ll; |
54 |
} |
} |
55 |
return $out; |
return $out; |
56 |
} |
} |
57 |
|
|
|
print $board, draw( @board ); |
|
|
|
|
|
my @step_name = ( qw/right down left up/ ); |
|
|
my @move_by = ( 1, $ll, -1, -$ll ); |
|
|
my $step = 0; # right |
|
|
|
|
|
# offset 0, top-left corner |
|
|
my $pos = shift @ARGV || 0; |
|
|
|
|
|
my @trace = ('x') x ( $#board + 1 ); |
|
58 |
sub trace { |
sub trace { |
59 |
warn "trace $pos\n"; |
warn "## trace $pos\n"; |
60 |
$trace[ $pos ] = $board[ $pos ]; |
$trace[ $pos ] = $board[ $pos ]; |
61 |
} |
} |
62 |
|
|
|
warn draw( @trace ); |
|
|
trace; |
|
|
|
|
63 |
sub move { |
sub move { |
64 |
warn "move $step $step_name[$step]\n"; |
warn "move $step $step_name[$step]\n"; |
65 |
$pos += $move_by[ $step ]; |
$pos += $move_by[ $step ]; |
100 |
} |
} |
101 |
} |
} |
102 |
|
|
103 |
while( 1 ) { |
sub shape { |
104 |
|
|
105 |
my $next_pos = $pos + $move_by[ $step ]; |
my ($x,$y) = @_; |
|
warn "in loop - pos = $pos next_pos = $next_pos step = $step $step_name[$step]\n"; |
|
106 |
|
|
107 |
if ( $trace[ $next_pos ] ne 'x' ) { |
$pos = $y * $ll * 2 + $x * 2; |
108 |
warn "position $next_pos re-visited, exiting\n"; |
|
109 |
last; |
warn "<<< shape from $x,$y pos: $pos\n"; |
110 |
} elsif ( $board[ $next_pos ] =~ $ok_path ) { |
@trace = ($unknown) x ( $#board + 1 ); |
111 |
warn "OK next_pos = $next_pos b($board[$next_pos]) t($trace[$next_pos])\n"; |
trace; |
112 |
move; |
|
113 |
can_turn( $step + 1 ); |
my $len = 0; |
114 |
} else { |
|
115 |
warn "find line continuation from $step $step_name[$step]...\n"; |
while( 1 ) { |
116 |
can_turn( $step - 1 ) || can_turn( $step + 1 ) || die "can't find new direction"; |
|
117 |
|
my $next_pos = $pos + $move_by[ $step ]; |
118 |
|
warn "in loop - pos = $pos next_pos = $next_pos step = $step $step_name[$step]\n"; |
119 |
|
|
120 |
|
if ( $trace[ $next_pos ] ne $unknown ) { |
121 |
|
warn "position $next_pos re-visited, exiting\n"; |
122 |
|
last; |
123 |
|
} elsif ( $board[ $next_pos ] =~ $ok_path ) { |
124 |
|
warn "OK next_pos = $next_pos b($board[$next_pos]) t($trace[$next_pos])\n"; |
125 |
|
move; |
126 |
|
$len++; |
127 |
|
can_turn( $step + 1 ); |
128 |
|
} else { |
129 |
|
warn "find line continuation from $step $step_name[$step]...\n"; |
130 |
|
can_turn( $step - 1 ) || can_turn( $step + 1 ) || die "can't find new direction"; |
131 |
|
} |
132 |
|
warn draw( @trace ); |
133 |
|
|
134 |
|
print "WAIT> press enter"; my $foo = <STDIN>; |
135 |
} |
} |
|
warn draw( @trace ); |
|
136 |
|
|
137 |
|
warn ">>> ended at $pos, line length: $len\n"; |
138 |
|
return $len; |
139 |
} |
} |
140 |
|
|
141 |
warn "ended at $pos\n"; |
my $shapes = '0,0 1,0'; |
142 |
|
|
143 |
|
foreach my $start ( split(/\s/,$shapes) ) { |
144 |
|
my $len = shape( split(/,/,$start) ); |
145 |
|
warn "## $start has $len elements\n"; |
146 |
|
} |