263 lines
8 KiB
C++
263 lines
8 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) 2010 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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//$Id$
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#ifndef SVG_TRANSFORM_GRAMMAR_HPP
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#define SVG_TRANSFORM_GRAMMAR_HPP
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// agg
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#include <agg_trans_affine.h>
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// spirit
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#include <boost/spirit/include/qi.hpp>
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#include <boost/spirit/include/phoenix_function.hpp>
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#include <boost/spirit/include/phoenix_core.hpp>
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#include <boost/spirit/include/phoenix_operator.hpp>
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#include <boost/spirit/home/phoenix/object/construct.hpp>
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namespace mapnik { namespace svg {
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using namespace boost::spirit;
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using namespace boost::fusion;
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using namespace boost::phoenix;
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inline double deg2rad(double d)
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{
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return M_PI * d / 180.0;
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}
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template <typename TransformType>
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struct process_matrix
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{
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template <typename T0, typename T1, typename T2, typename T3, typename T4, typename T5>
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struct result
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{
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typedef void type;
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};
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explicit process_matrix( TransformType & tr)
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:tr_(tr) {}
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void operator () (double a, double b, double c, double d, double e, double f) const
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{
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tr_ = agg::trans_affine(a,b,c,d,e,f) * tr_;
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}
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TransformType & tr_;
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};
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template <typename TransformType>
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struct process_rotate
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{
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template <typename T0, typename T1, typename T2>
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struct result
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{
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typedef void type;
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};
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explicit process_rotate( TransformType & tr)
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:tr_(tr) {}
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template <typename T0,typename T1,typename T2>
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void operator () (T0 a, T1 cx, T2 cy) const
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{
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if (cx == 0.0 && cy == 0.0)
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{
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tr_ = agg::trans_affine_rotation(deg2rad(a)) * tr_;
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}
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else
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{
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agg::trans_affine t = agg::trans_affine_translation(-cx,-cy);
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t *= agg::trans_affine_rotation(deg2rad(a));
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t *= agg::trans_affine_translation(cx, cy);
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tr_ = t * tr_;
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}
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}
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TransformType & tr_;
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};
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template <typename TransformType>
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struct process_translate
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{
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template <typename T0, typename T1>
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struct result
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{
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typedef void type;
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};
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explicit process_translate( TransformType & tr)
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:tr_(tr) {}
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template <typename T0,typename T1>
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void operator () (T0 tx, T1 ty) const
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{
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if (ty) tr_ = agg::trans_affine_translation(tx,*ty) * tr_;
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else tr_ = agg::trans_affine_translation(tx,0.0) * tr_;
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}
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TransformType & tr_;
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};
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template <typename TransformType>
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struct process_scale
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{
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template <typename T0, typename T1>
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struct result
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{
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typedef void type;
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};
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explicit process_scale( TransformType & tr)
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:tr_(tr) {}
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template <typename T0,typename T1>
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void operator () (T0 sx, T1 sy) const
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{
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if (sy) tr_ = agg::trans_affine_scaling(sx,*sy) * tr_;
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else tr_ = agg::trans_affine_scaling(sx,sx) * tr_;
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}
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TransformType & tr_;
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};
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template <typename TransformType>
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struct process_skew
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{
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template <typename T0, typename T1>
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struct result
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{
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typedef void type;
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};
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explicit process_skew( TransformType & tr)
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:tr_(tr) {}
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template <typename T0,typename T1>
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void operator () (T0 skew_x, T1 skew_y) const
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{
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tr_ = agg::trans_affine_skewing(deg2rad(skew_x),deg2rad(skew_y)) * tr_;
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}
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TransformType & tr_;
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};
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// commented as this does not appear used and crashes clang when used with pch
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/*
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struct print_action
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{
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template <typename T>
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void operator()(T const& c, qi::unused_type, qi::unused_type) const
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{
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std::cerr << typeid(c).name() << std::endl;
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}
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};
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*/
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template <typename Iterator, typename SkipType, typename TransformType>
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struct svg_transform_grammar : qi::grammar<Iterator,SkipType>
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{
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explicit svg_transform_grammar(TransformType & tr)
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: svg_transform_grammar::base_type(start),
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matrix_action(process_matrix<TransformType>(tr)),
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rotate_action(process_rotate<TransformType>(tr)),
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translate_action(process_translate<TransformType>(tr)),
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scale_action(process_scale<TransformType>(tr)),
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skew_action(process_skew<TransformType>(tr))
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{
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using qi::_1;
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using qi::_2;
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using qi::_3;
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using qi::_4;
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using qi::_5;
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using qi::_6;
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using qi::_a;
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using qi::_b;
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using qi::_c;
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using qi::_val;
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using qi::double_;
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using qi::no_case;
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start = +transform_ ;
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transform_ = matrix | rotate | translate | scale | rotate | skewX | skewY ;
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matrix = no_case[lit("matrix")]
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>> lit('(')
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>> (
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double_ >> -lit(',')
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>> double_ >> -lit(',')
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>> double_ >> -lit(',')
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>> double_ >> -lit(',')
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>> double_ >> -lit(',')
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>> double_) [ matrix_action(_1,_2,_3,_4,_5,_6) ]
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>> lit(')')
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;
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translate = no_case[lit("translate")]
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>> lit('(')
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>> (double_ >> -lit(',')
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>> -double_) [ translate_action(_1,_2) ]
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>> lit(')');
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scale = no_case[lit("scale")]
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>> lit('(')
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>> (double_ >> -lit(',')
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>> -double_ )[ scale_action(_1,_2)]
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>> lit(')');
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rotate = no_case[lit("rotate")]
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>> lit('(')
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>> double_[_a = _1] >> -lit(',')
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>> -(double_ [_b = _1] >> -lit(',') >> double_[_c = _1])
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>> lit(')') [ rotate_action(_a,_b,_c)];
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skewX = no_case[lit("skewX")] >> lit('(') >> double_ [ skew_action(_1, 0.0)] >> lit(')');
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skewY = no_case[lit("skewY")] >> lit('(') >> double_ [ skew_action(0.0, _1)] >> lit(')');
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}
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// rules
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qi::rule<Iterator,SkipType> start;
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qi::rule<Iterator,SkipType> transform_;
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qi::rule<Iterator,SkipType> matrix;
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qi::rule<Iterator,SkipType> translate;
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qi::rule<Iterator,SkipType> scale;
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qi::rule<Iterator,qi::locals<double,double,double>, SkipType> rotate;
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qi::rule<Iterator,SkipType> skewX;
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qi::rule<Iterator,SkipType> skewY;
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// actions
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function<process_matrix<TransformType> > matrix_action;
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function<process_rotate<TransformType> > rotate_action;
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function<process_translate<TransformType> > translate_action;
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function<process_scale<TransformType> > scale_action;
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function<process_skew<TransformType> > skew_action;
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};
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}}
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#endif // SVG_TRANSFORM_GRAMMAR_HPP
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