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146 lines
4.0 KiB
C++
146 lines
4.0 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: ctrans.hpp 39 2005-04-10 20:39:53Z pavlenko $
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#ifndef CTRANS_HPP
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#define CTRANS_HPP
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#include <mapnik/envelope.hpp>
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#include <mapnik/coord_array.hpp>
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namespace mapnik {
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typedef coord_array<coord2d> CoordinateArray;
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template <typename Transform,typename Geometry>
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struct MAPNIK_DECL coord_transform
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{
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coord_transform(Transform const& t, Geometry& geom)
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: t_(t), geom_(geom) {}
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unsigned vertex(double *x , double *y) const
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{
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unsigned command = geom_.vertex(x,y);
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t_.forward(x,y);
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return command;
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}
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void rewind (unsigned pos)
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{
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geom_.rewind(pos);
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}
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private:
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Transform const& t_;
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Geometry& geom_;
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};
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class CoordTransform
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{
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private:
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int width;
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int height;
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double scale_;
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Envelope<double> extent_;
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public:
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CoordTransform(int width,int height,const Envelope<double>& extent)
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:width(width),height(height),extent_(extent)
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{
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double sx=((double)width)/extent_.width();
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double sy=((double)height)/extent_.height();
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scale_=std::min(sx,sy);
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}
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inline double scale() const
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{
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return scale_;
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}
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inline void forward(double * x, double * y) const
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{
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*x = (*x - extent_.minx()) * scale_;
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*y = (extent_.maxy() - *y) * scale_;
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}
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inline void backward(double * x, double * y) const
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{
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*x = extent_.minx() + *x/scale_;
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*y = extent_.maxy() - *y/scale_;
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}
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inline coord2d& forward(coord2d& c) const
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{
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forward(&c.x,&c.y);
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return c;
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}
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inline coord2d& backward(coord2d& c) const
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{
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backward(&c.x,&c.y);
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return c;
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}
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inline Envelope<double> forward(const Envelope<double>& e) const
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{
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double x0 = e.minx();
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double y0 = e.miny();
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double x1 = e.maxx();
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double y1 = e.maxy();
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forward(&x0,&y0);
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forward(&x1,&y1);
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return Envelope<double>(x0,y0,x1,y1);
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}
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inline Envelope<double> backward(const Envelope<double>& e) const
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{
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double x0 = e.minx();
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double y0 = e.miny();
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double x1 = e.maxx();
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double y1 = e.maxy();
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backward(&x0,&y0);
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backward(&x1,&y1);
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return Envelope<double>(x0,y0,x1,y1);
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}
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inline CoordinateArray& forward(CoordinateArray& coords) const
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{
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for (unsigned i=0;i<coords.size();++i)
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{
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forward(coords[i]);
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}
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return coords;
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}
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inline CoordinateArray& backward(CoordinateArray& coords) const
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{
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for (unsigned i=0;i<coords.size();++i)
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{
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backward(coords[i]);
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}
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return coords;
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}
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};
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}
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#endif //CTRANS_HPP
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