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# Encoding and name #_{ |
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=encoding utf8 |
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=head1 NAME |
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Geo::OSM::Render::Projection - Project OSM latitudes and longitudes into x, y coordinate pairs to be rendered by L. |
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package Geo::OSM::Render::Projection; |
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#_} |
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#_{ use … |
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use warnings; |
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use strict; |
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use utf8; |
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use Carp; |
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#_} |
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our $VERSION = 0.01; |
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#_{ Synopsis |
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=head1 SYNOPSIS |
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This is an abstract base class. So, I am hard pressed to write a synopsis here. |
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=cut |
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#_} |
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#_{ Overview |
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=head1 OVERVIEW |
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Before OpenStreetMap data can be rendered, the OSM coordinates must be projected into a suitable x/y coordinate system. |
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Descendents of this class should (must...) provide the conversion function C<> which performce |
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this projection. |
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Currently, two classes are derived from this class: |
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L<< Geo::OSM::Render::Projection::CH_LV03 >> and |
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L<< Geo::OSM::Render::Projection::Ident >>. |
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=cut |
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#_} |
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#_{ Methods |
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#_{ POD |
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=head1 METHODS |
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=cut |
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#_} |
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sub new { #_{ |
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#_{ POD |
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=head2 new |
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my $proj = Geo::OSM::Render::Projection->new(); |
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Create an instance of a projection. Use it in a derived class. |
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=cut |
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#_} |
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my $class = shift; |
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my $self = {}; |
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bless $self, $class; |
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} #_} |
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sub lat_lon_to_x_y { #_{ |
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#_{ POD |
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=head2 lat_lon_to_x_y |
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my ($x, $y) = $projection->lat_lon_to_x_y($lat, $lon); |
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Because this is an abstract base class, calling this method on C<> just |
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croaks. |
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=cut |
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#_} |
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croak ('Override this method in a descendant'); |
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} #_} |
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#_} |
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#_{ POD: Author |
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=head1 AUTHOR |
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René Nyffenegger |
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=cut |
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#_} |
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#_{ POD: Copyright and License |
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=head1 COPYRIGHT AND LICENSE |
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Copyright © 2017 René Nyffenegger, Switzerland. All rights reserved. |
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This program is free software; you can redistribute it and/or modify it |
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under the terms of the the Artistic License (2.0). You may obtain a |
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copy of the full license at: L |
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=cut |
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#_} |
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#_{ POD: Source Code |
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=head1 Source Code |
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The source code is on L<< github|https://github.com/ReneNyffenegger/perl-Geo-OSM-Render >>. Meaningful pull requests are welcome. |
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=cut |
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#_} |
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'tq84'; |