--- symmetry.pl	2007/08/26 10:26:13	3
+++ symmetry.pl	2007/08/26 12:17:00	5
@@ -26,6 +26,8 @@
 +-+-+-+-+-+-+-+-+
 _BOARD_
 
+my $debug = shift @ARGV || 0;
+
 my @board = map { split(//) } split(/\n/, $board);
 my @trace;
 
@@ -42,6 +44,13 @@
 # unknown trace position
 my $unknown = ' ';
 
+# path traversed
+my @directions;
+
+my @shapes_found;
+
+my @shapes_start = ( '0,0' ); #( qw/0,0 1,0 0,3/ );
+
 sub draw {
 	my $o = 0;
 	my $out;
@@ -60,13 +69,31 @@
 	$trace[ $pos ] = $board[ $pos ];
 }
 
+my ( $tr_x, $tr_y );
+
+sub pos_x_y {
+	my $y = int($pos / ($ll*2));
+	my $x = int(($pos % $ll) / 2);
+
+	$tr_x = $x unless defined $tr_x;
+	$tr_y = $y unless defined $tr_y;
+
+	$tr_x = $x if $x > $tr_x && $y == $tr_y;
+	$tr_y = $y if $y < $tr_y && $x == $tr_x;
+
+	warn "## pos_x_y $pos -> $x,$y\n";
+
+	return ($x,$y) if wantarray;
+	return "$x,$y";
+}
+
 sub move {
-	warn "move $step $step_name[$step]\n";
 	$pos += $move_by[ $step ];
 	trace;
 	$pos += $move_by[ $step ];
 	trace;
-	warn draw( @trace );
+	push @directions, $step;
+	warn "move $step $step_name[$step] to ", scalar pos_x_y, "\n";
 }
 
 sub follow {
@@ -91,15 +118,25 @@
 	$trace[ $turn_pos ] = $old;
 
 	if ( $board[ $turn_pos ] =~ $ok_path ) {
-		warn "OK can_turn $try_step $step_name[$try_step] turn_pos = $turn_pos b($board[$turn_pos]) t($trace[$turn_pos])";
+		warn "OK can_turn $try_step $step_name[$try_step] turn_pos = $turn_pos b($board[$turn_pos]) t($trace[$turn_pos])\n";
 		$step = $try_step;
 		return 1;
 	} else {
-		warn "NOPE can_turn $try_step $step_name[$try_step] turn_pos = $turn_pos b($board[$turn_pos]) t($trace[$turn_pos])";
+		warn "NOPE can_turn $try_step $step_name[$try_step] turn_pos = $turn_pos b($board[$turn_pos]) t($trace[$turn_pos])\n";
 		return 0;
 	}
 }
 
+sub show_directions {
+	return 
+		join('',
+			map {
+				substr($step_name[$_],0,1)
+			} @directions
+		)
+	;
+}
+
 sub shape {
 
 	my ($x,$y) = @_;
@@ -108,6 +145,7 @@
 
 	warn "<<< shape from $x,$y pos: $pos\n";
 	@trace = ($unknown) x ( $#board + 1 );
+	@directions = ();
 	trace;
 
 	my $len = 0;
@@ -115,7 +153,7 @@
 	while( 1 ) {
 
 		my $next_pos = $pos + $move_by[ $step ];
-		warn "in loop - pos = $pos next_pos = $next_pos step = $step $step_name[$step]\n";
+		warn "# pos: $pos next_pos: $next_pos step: $step $step_name[$step] trace: ",show_directions,"\n";
 
 		if ( $trace[ $next_pos ] ne $unknown ) {
 			warn "position $next_pos re-visited, exiting\n";
@@ -131,16 +169,33 @@
 		}
 		warn draw( @trace );
 
-		print "WAIT> press enter"; my $foo = <STDIN>;
+		if ( $debug ) {
+			warn "## tr: $tr_x,$tr_y\n";
+			print "WAIT> press enter | ",show_directions; my $foo = <STDIN>;
+		}
 	}
 
-	warn ">>> ended at $pos, line length: $len\n";
+	push @shapes_found, { x => $x, y => $y, len => $len, directions => show_directions };
+
+	warn ">>> ended at $pos, line length: $len, directions traversed: ",show_directions,"\n";
+
+	my $tr = "$tr_x,$tr_y";
+	if ( ! grep( /\Q$tr\E/, @shapes_start ) && $tr_x < 8 ) {
+		print "INFO: added top-right $tr\n";
+		push @shapes_start, $tr;
+	}
+
+	print "WAIT> press enter"; my $foo = <STDIN>;
+
 	return $len;
 }
 
-my $shapes = '0,0 1,0';
-
-foreach my $start ( split(/\s/,$shapes) ) {
+foreach my $start ( @shapes_start ) {
 	my $len = shape( split(/,/,$start) );
 	warn "## $start has $len elements\n";
 }
+
+print ">>> RESULTS:\n";
+foreach my $r ( @shapes_found ) {
+	printf "%2d,%-2d len: %-4d directions: %s\n", $r->{x}, $r->{y}, $r->{len}, $r->{directions};
+}