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package Compass::Points; |
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2834
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use strict; |
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128
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use warnings; |
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1734
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our $VERSION = "0.02"; |
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our @FIELDS = qw( abbr name ); |
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our @NAMES = ( |
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[ N => "North" ], |
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[ NbE => "North by east" ], |
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[ NNE => "North-northeast" ], |
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[ NEbN => "Northeast by north" ], |
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[ NE => "Northeast" ], |
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[ NEbE => "Northeast by east" ], |
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[ ENE => "East-northeast" ], |
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[ EbN => "East by north" ], |
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[ E => "East" ], |
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[ EbS => "East by south" ], |
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[ ESE => "East-southeast" ], |
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[ SEbE => "Southeast by east" ], |
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[ SE => "Southeast" ], |
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[ SEbS => "Southeast by south" ], |
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[ SSE => "South-southeast" ], |
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[ SbE => "South by east" ], |
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[ S => "South" ], |
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[ SbW => "South by west" ], |
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[ SSW => "South-southwest" ], |
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[ SWbS => "Southwest by south" ], |
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[ SW => "Southwest" ], |
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[ SWbW => "Southwest by west" ], |
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[ WSW => "West-southwest" ], |
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[ WbS => "West by south" ], |
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[ W => "West" ], |
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[ WbN => "West by north" ], |
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[ WNW => "West-northwest" ], |
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[ NWbW => "Northwest by west" ], |
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[ NW => "Northwest" ], |
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[ NWbN => "Northwest by north" ], |
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[ NNW => "North-northwest" ], |
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[ NbW => "North by west" ], |
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); |
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our @GROUP; # separate groups to assign different degree values |
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our @INDEX; # index per group |
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our @MAP; # mapping for easy access |
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for my $n ( 0 .. 3 ) { |
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my $slice = 360 / ( 2 ** ( 2 + $n ) ); # 90, 45, 22.5, 11.25 |
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my $mod = 2 ** ( 3 - $n ); # 8, 4, 2, 1 |
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my @offs = grep $_ % $mod == 0, 0 .. $#NAMES; # 0,8,16,24 0,4,8,12,... |
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$GROUP[ $n ] = bless( [], __PACKAGE__ ); |
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for my $m ( 0 .. $#offs ) { |
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my @entry = @{ $NAMES[ $offs[ $m ] ] }; |
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for my $key ( map lc, @entry ) { |
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$key =~ s![^a-z]!!g; |
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$INDEX[ $n ]{ $key } = \@entry; |
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} |
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$entry[ 2 ] = $m * $slice; |
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$GROUP[ $n ][ $m ] = \@entry; |
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} |
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$MAP[ $_ ] = $n for @MAP .. $#offs; |
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} |
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sub new |
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{ |
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5
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1
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2109
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my $class = shift; |
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5
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100
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31
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my $number = shift || 16; |
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0
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0
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$number = @{ $GROUP[ $#GROUP ] } |
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77
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if $number > @{ $GROUP[ $#GROUP ] }; |
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5
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return $GROUP[ $MAP[ $number - 1 ] ]; |
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} |
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for my $offset ( 0 .. $#FIELDS ) { |
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my $deg2sub = "deg2$FIELDS[ $offset ]"; |
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my $sub2deg = "$FIELDS[ $offset ]2deg"; |
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86
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3
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3
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36
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no strict qw( refs ); |
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3
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6
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3
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738
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87
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88
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*$deg2sub = sub { |
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16
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16
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my $self = shift; |
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16
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100
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my $deg = abs( shift || 0 ); |
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92
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16
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$deg -= 360 while $deg > 360; |
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16
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my $slice = 360 / @$self; |
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16
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my $index = ( $deg + $slice / 2 ) / $slice; |
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16
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return $self->[ $index ][ $offset ]; |
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}; |
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100
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*$sub2deg = sub { |
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my $self = shift; |
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my $key = lc( shift || "" ); |
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my $index = $INDEX[ $MAP[ @$self - 1 ] ]; |
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105
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6
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35
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$key =~ s![^a-z]!!g; |
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107
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6
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100
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return exists( $index->{ $key } ) |
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? $index->{ $key }[ 2 ] |
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: undef |
110
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; |
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}; |
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} |
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114
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1; |
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116
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__END__ |