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package Array::Tour::Serpentine; |
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37431
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use 5.008; |
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use strict; |
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use warnings; |
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use integer; |
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use base q(Array::Tour); |
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use Array::Tour qw(:directions :status); |
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our $VERSION = '0.06'; |
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=head1 NAME |
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Array::Tour::Serpentine - Return coordinates to take a serpentine path. |
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=head1 SYNOPSIS |
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use Array::Tour::Serpentine qw(:directions); |
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my $tour = Array::Tour::Serpentine->new( |
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dimensions => [5, 5], |
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vertical => $vertical, |
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corner_right => $corner_right, |
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corner_bottom => $corner_bottom); |
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Creates the object with its attributes. The attributes B, |
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B, B, and B are inherited from L. |
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This package adds more attributes of its own, which are: |
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=over 4 |
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=item counterclock, corner_bottom, corner_right, vertical |
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I All are boolean values that affect the starting |
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point and the direction of the tour. By default, the tour is |
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generated the upper left corner in a horizontal back-and-forth path. |
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See the Examples section |
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to see what effects the different combinations produce. |
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=back |
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=head1 PREREQUISITES |
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Perl 5.8 or later. This is the version of perl under which this module |
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was developed. |
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48
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=head1 DESCRIPTION |
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A simple iterator that will return the coordinates of the next cell if |
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one were to tour an array's cells in a serpentine path. |
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53
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=head2 Serpentine Object Methods |
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56
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=head3 direction() |
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58
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$dir = $tour->direction() |
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60
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Return the direction we just walked. |
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Overrides Array::Tour's direction() method. |
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=cut |
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65
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sub direction() |
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{ |
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my $self = shift; |
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return ($self->{status} == STOP)? undef: ${$self->{direction}}[0]; |
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} |
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71
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=head3 next() |
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Returns a reference to an array of coordinates. Returns undef |
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if there is no next cell to visit. |
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76
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Overrides Array::Tour's next() method. |
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=cut |
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80
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sub next |
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{ |
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536
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1
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my $self = shift; |
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84
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return undef unless ($self->has_next()); |
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# |
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# Set up the conditions for the pacing. |
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# |
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520
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if ($self->{tourstatus} == START) |
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{ |
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$self->{tourstatus} = TOURING; |
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$self->{pacer} = ${$self->{pacing}}[0]; |
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} |
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else |
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{ |
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# |
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# Pace off in the current direction. |
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# |
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my $direction = ${$self->{direction}}[0]; |
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504
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${$self->{position}}[(($direction & (North | South)) == 0)? 0: 1] += |
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1526
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(($direction & (North | West)) == 0)? 1: -1; |
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103
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# |
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# Will the next pace be in a different direction? |
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# |
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1455
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if (--$self->{pacer} == 0) |
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{ |
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168
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$self->{pacer} = ${$self->{pacing}}[1]; |
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266
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${$self->{pacing}}[0] += $self->{pacechange}; |
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# |
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# Rotate to the next pacing length and the next direction. |
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# |
114
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168
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158
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push @{$self->{pacing}}, shift @{$self->{pacing}}; |
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269
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push @{$self->{direction}}, shift @{$self->{direction}}; |
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116
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} |
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} |
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119
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520
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1166
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$self->{tourstatus} = STOP if (++$self->{odometer} == $self->{tourlength}); |
120
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520
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1347
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return $self->adjusted_position(); |
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} |
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=head3 opposite() |
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125
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$ruot = $tour->opposite(); |
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127
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Return a new object that follows the same path as the original object, |
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reversing the inward/outward direction. |
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131
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=cut |
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133
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sub opposite() |
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{ |
135
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0
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1
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my $self = shift; |
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0
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my %anti_self; |
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my @dimensions = @{ $self->{dimensions} }; |
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138
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139
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$anti_self{dimensions} = $self->{dimensions}; |
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141
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0
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$anti_self{corner_right} ^= 1; |
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$anti_self{corner_bottom} ^= 1; |
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144
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0
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return Array::Tour::Serpentine->new(%anti_self); |
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} |
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147
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=head3 _set() |
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149
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$self->_set(%parameters); |
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151
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Override Array::Tour's _set() method for one that can handle |
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our parameters. |
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=cut |
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155
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sub _set() |
156
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{ |
157
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16
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my $self = shift; |
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46
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my(%params) = @_; |
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16
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27
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my($pace_x, $pace_y) = (1, 1); |
160
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16
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20
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my($start_x, $start_y) = (0, 0); |
161
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35
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my @dirlist = (East, South, West, North); |
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20
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my @dimensions = @{$self->{dimensions}}; |
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71
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163
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21
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my @direction; |
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165
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35
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warn "Unknown paramter $_" foreach (grep{$_ !~ /vertical|corner_right|corner_bottom/} (keys %params)); |
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232
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166
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167
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# |
168
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# Parameter checks. |
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# |
170
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# Set corner_right, corner_bottom, and vertical to 0/1 values. |
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# |
172
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my $vertical = (defined $params{vertical} and $params{vertical} != 0)? 1: 0; |
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my $corner_right = (defined $params{corner_right} and $params{corner_right} != 0)? 1: 0; |
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my $corner_bottom = (defined $params{corner_bottom} and $params{corner_bottom} != 0)? 1: 0; |
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176
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100
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35
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$pace_x = $dimensions[0] - 1 unless ($vertical); |
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$pace_y = $dimensions[1] - 1 if ($vertical); |
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100
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$start_x = $dimensions[0] - 1 if ($corner_right); |
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$start_y = $dimensions[1] - 1 if ($corner_bottom); |
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35
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my $idx0 = ((($corner_bottom & $vertical)| |
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($corner_right & ($vertical^1))) << 1) | $vertical; |
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62
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my $idx1 = ((($corner_bottom & ($vertical^1))| |
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($corner_right & $vertical)) << 1) | ($vertical ^ 1); |
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push @direction, @dirlist[$idx0, $idx1, $idx0 ^ 2, $idx1]; |
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187
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$self->{corner_right} = $corner_right; |
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$self->{corner_bottom} = $corner_bottom; |
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$self->{vertical} = $vertical; |
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29
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$self->{direction} = \@direction; |
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16
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26
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$self->{pacechange} = 0; |
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100
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53
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$self->{pacing} = (($direction[0] & (West | East)) == 0)? [$pace_y, $pace_x]: [$pace_x, $pace_y]; |
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58
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$self->{start} = [$start_x, $start_y]; |
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41
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$self->{position} = [$start_x, $start_y]; |
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196
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98
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return $self; |
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} |
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199
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1; |
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__END__ |