49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2014 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_CLIPPING_EXTENT_HPP
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#define MAPNIK_CLIPPING_EXTENT_HPP
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#include <mapnik/box2d.hpp>
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namespace mapnik {
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template <typename T>
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box2d<double> clipping_extent(T const& common)
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{
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if (common.t_.offset() > 0)
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{
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box2d<double> box = common.query_extent_;
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double scale = static_cast<double>(common.query_extent_.width())/static_cast<double>(common.width_);
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// 3 is used here because at least 3 was needed for the 'style-level-compositing-tiled-0,1' visual test to pass
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// TODO - add more tests to hone in on a more robust #
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scale *= common.t_.offset() * 3;
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box.pad(scale);
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return box;
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}
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return common.query_extent_;
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}
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} // namespace mapnik
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#endif // MAPNIK_CLIPPING_EXTENT_HPP
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