/[symmetry-circle]/symmetry.pl
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Annotation of /symmetry.pl

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Revision 4 - (hide annotations)
Sun Aug 26 10:59:01 2007 UTC (11 years, 11 months ago) by dpavlin
File MIME type: text/plain
File size: 3548 byte(s)
- remember path traversed to create shape
- wait for key after each step if started with any argument
1 dpavlin 1 #!/usr/bin/perl -w
2    
3     # symmetry.pl
4     #
5     # 08/26/07 02:40:37 CEST Dobrica Pavlinusic <dpavlin@rot13.org>
6    
7     use strict;
8    
9     my $board = << '_BOARD_';
10     +-+-+-+-+-+-+-+-+
11     | | |o| | |
12     + + +-+ +-+ |
13     |o| | o | o |
14     + + +-+ +-+ |
15     | | o | | |
16     +-+-+ +-+-+-+-+
17     | | |o| |
18     +-+ + +-+-+ +-+
19     | |o| |o|o|o|o|
20     + + +-+-+-+-+ +-+
21     |o| | | |
22     + +-+-+-+-+-+-+-+
23     | | o |
24     +-+-+-+-+-+-+-+-+
25     | o | o |
26     +-+-+-+-+-+-+-+-+
27     _BOARD_
28    
29 dpavlin 4 my $debug = shift @ARGV || 0;
30    
31 dpavlin 1 my @board = map { split(//) } split(/\n/, $board);
32 dpavlin 3 my @trace;
33 dpavlin 1
34     # line length
35     my $ll = 8 * 2 + 1;
36    
37 dpavlin 3 my @step_name = ( qw/right down left up/ );
38     my @move_by = ( 1, $ll, -1, -$ll );
39     my $step = 0; # right
40    
41     # offset 0, top-left corner
42     my $pos = 0;
43    
44     # unknown trace position
45     my $unknown = ' ';
46    
47 dpavlin 4 # path traversed
48     my @directions;
49    
50     my @found;
51    
52 dpavlin 1 sub draw {
53     my $o = 0;
54     my $out;
55     while ( $o < $#board ) {
56 dpavlin 3 $out .= join('', @board[ $o .. $o + $ll - 1 ]);
57     $out .= ' ';
58     $out .= join('', @trace[ $o .. $o + $ll - 1 ]);
59     $out .= "\n";
60 dpavlin 1 $o += $ll;
61     }
62     return $out;
63     }
64    
65     sub trace {
66 dpavlin 3 warn "## trace $pos\n";
67 dpavlin 1 $trace[ $pos ] = $board[ $pos ];
68     }
69    
70     sub move {
71     warn "move $step $step_name[$step]\n";
72     $pos += $move_by[ $step ];
73     trace;
74     $pos += $move_by[ $step ];
75     trace;
76 dpavlin 4 push @directions, $step;
77 dpavlin 1 }
78    
79     sub follow {
80     $step = shift;
81     $step %= 4;
82     warn "follow $step $step_name[$step]\n";
83     }
84    
85     my $ok_path = qr/[\|\-]/;
86    
87     sub can_turn {
88 dpavlin 2 my $try_step = shift;
89     die "no step?" unless defined $try_step;
90 dpavlin 1
91 dpavlin 2 $try_step %= 4;
92 dpavlin 1
93 dpavlin 2 my $turn_pos = $pos + $move_by[$try_step];
94    
95 dpavlin 1 my $old = $trace[ $turn_pos ];
96     $trace[ $turn_pos ] = '?';
97     warn "TEST\n",draw( @trace );
98     $trace[ $turn_pos ] = $old;
99    
100     if ( $board[ $turn_pos ] =~ $ok_path ) {
101 dpavlin 2 warn "OK can_turn $try_step $step_name[$try_step] turn_pos = $turn_pos b($board[$turn_pos]) t($trace[$turn_pos])";
102     $step = $try_step;
103 dpavlin 1 return 1;
104     } else {
105 dpavlin 2 warn "NOPE can_turn $try_step $step_name[$try_step] turn_pos = $turn_pos b($board[$turn_pos]) t($trace[$turn_pos])";
106 dpavlin 1 return 0;
107     }
108     }
109    
110 dpavlin 4 sub show_directions {
111     return
112     join('',
113     map {
114     substr($step_name[$_],0,1)
115     } @directions
116     )
117     ;
118     }
119    
120 dpavlin 3 sub shape {
121 dpavlin 1
122 dpavlin 3 my ($x,$y) = @_;
123 dpavlin 1
124 dpavlin 3 $pos = $y * $ll * 2 + $x * 2;
125    
126     warn "<<< shape from $x,$y pos: $pos\n";
127     @trace = ($unknown) x ( $#board + 1 );
128 dpavlin 4 @directions = ();
129 dpavlin 3 trace;
130    
131     my $len = 0;
132    
133     while( 1 ) {
134    
135     my $next_pos = $pos + $move_by[ $step ];
136 dpavlin 4 warn "# pos: $pos next_pos: $next_pos step: $step $step_name[$step] trace: ",show_directions,"\n";
137 dpavlin 3
138     if ( $trace[ $next_pos ] ne $unknown ) {
139     warn "position $next_pos re-visited, exiting\n";
140     last;
141     } elsif ( $board[ $next_pos ] =~ $ok_path ) {
142     warn "OK next_pos = $next_pos b($board[$next_pos]) t($trace[$next_pos])\n";
143     move;
144     $len++;
145     can_turn( $step + 1 );
146     } else {
147     warn "find line continuation from $step $step_name[$step]...\n";
148     can_turn( $step - 1 ) || can_turn( $step + 1 ) || die "can't find new direction";
149     }
150     warn draw( @trace );
151    
152 dpavlin 4 if ( $debug ) {
153     print "WAIT> press enter | ",show_directions; my $foo = <STDIN>;
154     }
155 dpavlin 1 }
156    
157 dpavlin 4 push @found, { x => $x, y => $y, len => $len, directions => show_directions };
158    
159     warn ">>> ended at $pos, line length: $len, directions traversed: ",show_directions,"\n";
160     print "WAIT> press enter"; my $foo = <STDIN>;
161    
162 dpavlin 3 return $len;
163 dpavlin 1 }
164    
165 dpavlin 4 my $shapes = '0,0 1,0 0,3';
166 dpavlin 1
167 dpavlin 3 foreach my $start ( split(/\s/,$shapes) ) {
168     my $len = shape( split(/,/,$start) );
169     warn "## $start has $len elements\n";
170     }
171 dpavlin 4
172     print ">>> RESULTS:\n";
173     foreach my $r ( @found ) {
174     printf "%2d,%-2d len: %-4d directions: %s\n", $r->{x}, $r->{y}, $r->{len}, $r->{directions};
175     }

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