--- symmetry.pl	2007/08/26 10:59:01	4
+++ symmetry.pl	2007/08/26 12:17:00	5
@@ -47,7 +47,9 @@
 # path traversed
 my @directions;
 
-my @found;
+my @shapes_found;
+
+my @shapes_start = ( '0,0' ); #( qw/0,0 1,0 0,3/ );
 
 sub draw {
 	my $o = 0;
@@ -67,13 +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;
 	push @directions, $step;
+	warn "move $step $step_name[$step] to ", scalar pos_x_y, "\n";
 }
 
 sub follow {
@@ -98,11 +118,11 @@
 	$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;
 	}
 }
@@ -150,26 +170,32 @@
 		warn draw( @trace );
 
 		if ( $debug ) {
+			warn "## tr: $tr_x,$tr_y\n";
 			print "WAIT> press enter | ",show_directions; my $foo = <STDIN>;
 		}
 	}
 
-	push @found, { x => $x, y => $y, len => $len, directions => show_directions };
+	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 0,3';
-
-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 ( @found ) {
+foreach my $r ( @shapes_found ) {
 	printf "%2d,%-2d len: %-4d directions: %s\n", $r->{x}, $r->{y}, $r->{len}, $r->{directions};
 }