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package Politics::AU::Geo; |
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=pod |
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=head1 NAME |
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Politics::AU::Geo - An ORLite-based ORM Database API |
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=head1 SYNOPSIS |
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TO BE COMPLETED |
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=head1 DESCRIPTION |
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TO BE COMPLETED |
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=head1 METHODS |
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=cut |
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20401
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use 5.006; |
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use strict; |
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use warnings; |
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use Storable 2.20 (); |
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use Math::Polygon 1.01 (); |
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use Params::Util 0.38 (); |
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use ORLite::Mirror 1.15 (); |
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our $VERSION = '0.01'; |
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use Politics::AU::Geo::Electorates; |
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use Politics::AU::Geo::Polygons; |
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# Set up the ORLite::Mirror integration for the dataset |
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sub import { |
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my $class = shift; |
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my $params = Params::Util::_HASH(shift) || {}; |
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# Pass through any params from above |
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$params->{url} ||= 'http://myrepresentatives.org/db.gz'; |
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$params->{maxage} ||= 30 * 24 * 60 * 60; # One week |
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# Prevent double-initialisation |
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$class->can('orlite') or |
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ORLite::Mirror->import( $params, '-DEBUG' ); |
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return 1; |
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} |
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###################################################################### |
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# Custom Methods |
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=pod |
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=head2 geo2electorates |
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my @electorates = Politics::AU::Geo->geo2electorates( -33.895922, 151.110022 ); |
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The C method takes a latitude and longitude and resolves the |
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set of electorates that the point is within. |
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Returns a list of L objects, or throws an |
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exception on error. |
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=cut |
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sub geo2electorates { |
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my $class = shift; |
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my $latitude = shift; |
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my $longitude = shift; |
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# Do a first-pass query to find the electorates that we match |
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# the general bounding boxes for. |
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my @electorates = Politics::AU::Geo::Electorates->select( |
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'WHERE bblat2 <= ? and bblat1 >= ? and bblong1 <= ? and bblong2 >= ?', |
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$latitude, |
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$latitude, |
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$longitude, |
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$longitude, |
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); |
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# Count the number of electorates per house |
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my %filter = (); |
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foreach ( @electorates ) { |
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$filter{$_->house_id}++; |
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} |
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# Polygon filter any electorates where we have more than one for the house |
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@electorates = grep { |
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$filter{$_->house_id} == 1 |
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or |
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$_->point_in_polygon( $latitude, $longitude ) |
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} @electorates; |
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return @electorates; |
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} |
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102
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1; |
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__END__ |