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package Games::Go::SimpleBoard; |
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|
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=head1 NAME |
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|
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Games::Go::SimpleBoard - represent a simple go board |
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|
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=head1 SYNOPSIS |
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|
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use Games::Go::SimpleBoard; |
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|
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=head1 DESCRIPTION |
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|
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Please supply a description ) |
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|
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=head2 EXPORTED CONSTANTS |
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|
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Marker types for each board position (ORed together): |
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|
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MARK_TRIANGLE # triangle mark |
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MARK_SQUARE # square mark |
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MARK_CIRCLE # circle mark |
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MARK_SMALL_B # small stone, used for scoring or marking |
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MARK_SMALL_W # small stone, used for scoring or marking |
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MARK_B # normal black stone |
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MARK_W # normal whit stone |
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MARK_GRAYED # in conjunction with MARK_[BW], grays the stone |
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MARK_LABEL # a text label |
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MARK_HOSHI # this is a hoshi point (not used much) |
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MARK_MOVE # this is a regular move |
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MARK_KO # this is a ko position |
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MARK_REDRAW # ignored, can be used for your own purposes |
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|
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COLOUR_BLACK # used for $board->{last} |
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COLOUR_WHITE # to mark the colour of the last move |
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|
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MOVE_HANDICAP # used as "x-coordinate" for handicap moves |
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MOVE_PASS # can be used as "x-coordinate" for handicap moves |
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|
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=head2 METHODS |
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|
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=over 4 |
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|
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=cut |
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|
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no warnings; |
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use strict; |
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|
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use Carp (); |
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|
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use base Exporter::; |
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|
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our $VERSION = '1.0'; |
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|
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our @EXPORT = qw( |
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MARK_TRIANGLE MARK_SQUARE MARK_CIRCLE MARK_SMALL_B MARK_SMALL_W MARK_B |
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MARK_W MARK_GRAYED MARK_MOVE MARK_LABEL MARK_HOSHI MARK_KO |
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MARK_REDRAW |
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COLOUR_BLACK COLOUR_WHITE |
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MOVE_HANDICAP MOVE_PASS |
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); |
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|
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# marker types for each board position (ORed together) |
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|
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sub MARK_TRIANGLE (){ 0x0001 } |
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sub MARK_SQUARE (){ 0x0002 } |
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sub MARK_CIRCLE (){ 0x0004 } |
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sub MARK_SMALL_B (){ 0x0008 } # small stone, used for scoring or marking |
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sub MARK_SMALL_W (){ 0x0010 } # small stone, used for scoring or marking |
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sub MARK_B (){ 0x0020 } # normal black stone |
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sub MARK_W (){ 0x0040 } # normal whit stone |
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sub MARK_GRAYED (){ 0x0080 } # in conjunction with MARK_[BW], grays the stone |
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sub MARK_LABEL (){ 0x0100 } |
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sub MARK_HOSHI (){ 0x0200 } # this is a hoshi point (not used much) |
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sub MARK_MOVE (){ 0x0400 } # this is a regular move |
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sub MARK_KO (){ 0x0800 } # this is a ko position |
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sub MARK_REDRAW (){ 0x8000 } |
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|
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sub COLOUR_BLACK (){ 0 } |
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sub COLOUR_WHITE (){ 1 } |
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|
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sub MOVE_PASS (){ undef } |
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sub MOVE_HANDICAP (){ -2 } |
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|
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=item my $board = new $size |
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|
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Creates a new empty board of the given size. |
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|
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C<< $board->{size} >> stores the board size. |
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|
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C<< $board->{max} >> stores the maximum board coordinate (size-1). |
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|
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C<< $board->{captures}[COLOUR] >> stores the number of captured stones for |
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the given colour. |
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|
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C<< $board->{last} >> stores the colour of the last move that was played. |
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|
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C<< $board->{board} >> stores a two-dimensional array with board contents. |
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|
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=cut |
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|
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sub new { |
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my $class = shift; |
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my $size = shift; |
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bless { |
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max => $size - 1, |
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size => $size, |
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board => [map [(0) x $size], 1 .. $size], |
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captures => [0, 0], # captures |
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#timer => [], |
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#score => [], |
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#last => COLOUR_..., |
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@_ |
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}, |
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$class; |
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} |
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|
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# inefficient and primitive, I hear you say? |
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# well... you are right :) |
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# use an extremely dumb floodfill algorithm to get rid of captured stones |
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sub capture { |
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my ($self, $mark, $x, $y) = @_; |
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|
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my %seen; |
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my @found; |
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my @nodes = ([$x,$y]); |
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my $board = $self->{board}; |
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|
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my $max = $self->{max}; |
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|
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while (@nodes) { |
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my ($x, $y) = @{pop @nodes}; |
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unless ($seen{$x,$y}++) { |
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if ($board->[$x][$y] & $mark) { |
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push @found, [$x, $y]; |
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|
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push @nodes, [$x-1, $y] unless $seen{$x-1, $y} || $x <= 0; |
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push @nodes, [$x+1, $y] unless $seen{$x+1, $y} || $x >= $max; |
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push @nodes, [$x, $y-1] unless $seen{$x, $y-1} || $y <= 0; |
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push @nodes, [$x, $y+1] unless $seen{$x, $y+1} || $y >= $max; |
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} elsif (!($board->[$x][$y] & (MARK_B | MARK_W))) { |
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return; |
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} |
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} |
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} |
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|
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@found |
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} |
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|
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=item $hint = $board->update ([update-structures...]) |
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|
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Each update-structure itself is also an array-ref: |
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|
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[$x, $y, $clr, $set, $label, $hint] # update or move |
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[MOVE_HANDICAP, $handicap] # black move, setup handicap |
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[MOVE_PASS] # pass |
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[] # also pass (deprecated!) |
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|
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It changes the board or executes a move, by first clearing the bits |
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specified in C<$clr>, then setting bits specified in C<$set>. |
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|
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If C<$set> includes C<MARK_LABEL>, the label text must be given in |
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C<$label>. |
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|
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If C<$set> contains C<MARK_MOVE>, then a circle symbol will be placed |
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at this coordinate. Also, surrounded stones will be removed from the |
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board and (simple) Kos are detected and marked with square symbols and |
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C<MARK_KO>. The circle and square markings are removed with the next |
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update that uses C<MARK_MOVE>, so this flag is suited well for marking, |
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well, moves. Note that you can make invalid "moves" (such as suicide) and |
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C<update> will try to cope with it. You can use C<is_valid_move> to avoid |
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making illegal moves. |
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|
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For handicap "moves", currently only board sizes 9, 13 and 19 are |
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supported and only handicap values from 2 to 9. The placement follows the |
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IGS rules, if you want other placements, you have to set it up yourself. |
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|
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This function modifies the C<$hint> member of the specified structure |
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to speed up repeated board generation and updates with the same update |
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structures. |
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|
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If the hint member is a reference the scalar pointed to by the reference |
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is updated instead. |
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|
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If all this hint member thing is confusing, just ignore it and specify |
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it as C<undef> or leave it out of the array entirely. Do make sure that |
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you keep your update structures around as long as previous updates don't |
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change, however, as regenerating a full board position from hinted |
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update structures is I<much> faster then recreating it from fresh update |
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structures. |
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|
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Example, make two silly moves: |
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|
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$board->update ([[0, 18, -1, MARK_B | MARK_MOVE], |
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[0, 17, -1, MARK_W | MARK_MOVE]]); |
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|
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=cut |
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|
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our %HANDICAP_COORD = ( |
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9 => [2, 4, 6], |
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13 => [3, 6, 9], |
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19 => [3, 9, 15], |
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); |
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our %HANDICAP_XY = ( |
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2 => [qw(0,2 2,0 )], |
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3 => [qw(0,2 2,0 2,2 )], |
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4 => [qw(0,2 2,0 2,2 0,0 )], |
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5 => [qw(0,2 2,0 2,2 0,0 1,1)], |
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6 => [qw(0,2 2,0 2,2 0,0 0,1 2,1 )], |
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7 => [qw(0,2 2,0 2,2 0,0 0,1 2,1 1,1)], |
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8 => [qw(0,2 2,0 2,2 0,0 0,1 2,1 1,0 1,2 )], |
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9 => [qw(0,2 2,0 2,2 0,0 0,1 2,1 1,0 1,2 1,1)], |
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); |
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|
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sub update { |
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my ($self, $path) = @_; |
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|
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my $board = $self->{board}; |
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|
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for (@$path) { |
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my ($x, $y, $clr, $set, $label) = @$_; |
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|
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my $nodemask = |
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$_ == $path->[-1] |
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? ~0 |
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: ~(MARK_SQUARE | MARK_TRIANGLE | MARK_CIRCLE | MARK_LABEL | MARK_KO); |
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|
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if (!defined $x) { |
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# pass |
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$self->{last} = $set & MARK_B ? COLOUR_BLACK : COLOUR_WHITE; |
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|
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} elsif ($x == MOVE_HANDICAP) { |
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# $y = #handicap stones |
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my $c = $HANDICAP_COORD{$self->{size}} |
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or Carp::croak "$self->{size}: illegal board size for handicap"; |
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my $h = $HANDICAP_XY{$y} |
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or Carp::croak "$y: illegal number of handicap stones"; |
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|
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for (@$h) { |
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my ($x, $y) = map $c->[$_], split /,/; |
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$board->[$x][$y] = MARK_B | MARK_MOVE; |
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} |
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|
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} else { |
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$board->[$x][$y] = |
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$board->[$x][$y] |
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& ~$clr |
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| $set |
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& $nodemask; |
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|
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$self->{label}[$x][$y] = $label if $set & MARK_LABEL; |
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|
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if ($set & MARK_MOVE) { |
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$self->{last} = $set & MARK_B ? COLOUR_BLACK : COLOUR_WHITE; |
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|
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unless (${ $_->[5] ||= \my $hint }) { |
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my ($own, $opp) = |
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$set & MARK_B |
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? (MARK_B, MARK_W) |
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: (MARK_W, MARK_B); |
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|
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my (@capture, $suicide); |
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|
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push @capture, $self->capture ($opp, $x-1, $y) if $x > 0 && $board->[$x-1][$y] & $opp; |
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push @capture, $self->capture ($opp, $x+1, $y) if $x < $self->{max} && $board->[$x+1][$y] & $opp; |
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push @capture, $self->capture ($opp, $x, $y-1) if $y > 0 && $board->[$x][$y-1] & $opp; |
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push @capture, $self->capture ($opp, $x, $y+1) if $y < $self->{max} && $board->[$x][$y+1] & $opp; |
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|
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# keep only unique coordinates |
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@capture = do { my %seen; grep !$seen{"$_->[0],$_->[1]"}++, @capture }; |
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|
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# remove captured stones |
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$self->{captures}[$self->{last}] += @capture; |
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$self->{board}[$_->[0]][$_->[1]] &= ~(MARK_B | MARK_W | MARK_MOVE) |
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for @capture; |
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|
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$suicide += $self->capture ($own, $x, $y); |
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|
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${ $_->[5] } ||= !(@capture || $suicide); |
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|
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if (!$suicide && @capture == 1) { |
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# possible ko. now check liberties on placed stone |
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|
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my $libs; |
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|
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$libs++ if $x > 0 && !($board->[$x-1][$y] & $opp); |
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$libs++ if $x < $self->{max} && !($board->[$x+1][$y] & $opp); |
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$libs++ if $y > 0 && !($board->[$x][$y-1] & $opp); |
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$libs++ if $y < $self->{max} && !($board->[$x][$y+1] & $opp); |
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|
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if ($libs == 1) { |
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$board->[$x][$y] = $board->[$x][$y] & ~MARK_CIRCLE | (MARK_KO & $nodemask); |
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($x, $y) = @{$capture[0]}; |
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$board->[$x][$y] |= MARK_KO & $nodemask; |
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} |
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} |
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} |
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} |
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} |
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} |
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} |
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|
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=item $board->is_valid_move ($colour, $x, $y[, $may_suicide]) |
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|
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Returns true if the move of the given colour on the given coordinates is |
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valid or not. Kos are taken into account as long as they are marked with |
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C<MARK_KO>. Suicides are invalid unless C<$may_suicide> is true (e.g. for |
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new zealand rules) |
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|
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=cut |
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|
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sub is_valid_move { |
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my ($self, $colour, $x, $y, $may_suicide) = @_; |
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|
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my $board = $self->{board}; |
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|
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return if $board->[$x][$y] & (MARK_B | MARK_W | MARK_KO); |
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|
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if ($may_suicide) { |
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return 1; |
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} else { |
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my ($own, $opp) = $colour == COLOUR_BLACK |
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? (MARK_B, MARK_W) |
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: (MARK_W, MARK_B); |
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|
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# try the move |
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local $board->[$x][$y] = $board->[$x][$y] | $own; |
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|
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return 1 if $x > 0 && $board->[$x-1][$y] & $opp && $self->capture ($opp, $x-1, $y, 1); |
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return 1 if $x < $self->{max} && $board->[$x+1][$y] & $opp && $self->capture ($opp, $x+1, $y, 1); |
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return 1 if $y > 0 && $board->[$x][$y-1] & $opp && $self->capture ($opp, $x, $y-1, 1); |
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return 1 if $y < $self->{max} && $board->[$x][$y+1] & $opp && $self->capture ($opp, $x, $y+1, 1); |
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|
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return !$self->capture ($own, $x, $y, 1); |
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} |
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} |
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|
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1; |
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|
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=back |
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|
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=head2 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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|
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=head2 SEE ALSO |
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|
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L<Gtk2::GoBoard>. |
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|
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=cut |
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|
