60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
/* This file is part of Mapnik (c++ mapping toolkit)
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* Copyright (C) 2005 Artem Pavlenko
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*
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* Mapnik is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//$Id$
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#ifndef SYMBOLIZER_HH
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#define SYMBOLIZER_HH
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#include "graphics.hh"
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#include "geometry.hh"
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#include <limits>
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namespace mapnik
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{
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class Image32;
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struct Symbolizer
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{
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virtual bool active(double scale) const=0;
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virtual void render(geometry_type& geom, Image32& image) const=0;
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virtual ~Symbolizer() {}
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};
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struct SymbolizerImpl : public Symbolizer
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{
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private:
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double min_scale_;
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double max_scale_;
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public:
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SymbolizerImpl()
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: min_scale_(0),
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max_scale_(std::numeric_limits<double>::max()) {}
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SymbolizerImpl(double min_scale,double max_scale)
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: min_scale_(min_scale),
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max_scale_(max_scale) {}
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virtual ~SymbolizerImpl() {}
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bool active(double scale) const
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{
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return ( scale > min_scale_ && scale < max_scale_ );
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}
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};
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}
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#endif //SYMBOLIZER_HH
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