92 lines
2.3 KiB
C++
92 lines
2.3 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) 2006 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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//$Id: vertex_transform.hpp 39 2005-04-10 20:39:53Z pavlenko $
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#ifndef VERTEX_TRANSFORM_HPP
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#define VERTEX_TRANSFORM_HPP
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#include "vertex.hpp"
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#include "envelope.hpp"
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namespace mapnik
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{
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template <typename T0 ,typename T1,int shift=8>
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struct Shift
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{
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typedef T0 value_type;
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typedef T1 return_type;
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static return_type apply(value_type val)
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{
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return static_cast<return_type>(val*(1<<shift));
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}
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};
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template <typename T0,typename T1>
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struct Shift<T0,T1,0>
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{
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typedef T0 value_type;
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typedef T1 return_type;
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static return_type apply(value_type val)
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{
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return static_cast<return_type>(val);
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}
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};
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template <typename T>
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struct Shift<T,T,0>
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{
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typedef T value_type;
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typedef T return_type;
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static T& apply(T& val)
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{
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return val;
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}
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};
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typedef Shift<double,double,0> NO_SHIFT;
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typedef Shift<double,int,0> SHIFT0;
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typedef Shift<double,int,8> SHIFT8;
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template <typename T0,typename T1,typename Trans>
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struct view_transform;
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template <typename Trans>
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struct view_transform <vertex2d,vertex2d,Trans>
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{
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};
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template <typename Trans>
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struct view_transform <vertex2d,vertex2i,Trans>
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{
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};
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template <typename Trans>
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struct view_transform<Envelope<double>,Envelope<double>,Trans>
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{
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};
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}
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#endif //VERTEX_TRANSFORM_HPP
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