346 lines
7.2 KiB
C++
346 lines
7.2 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: geometry.hpp 39 2005-04-10 20:39:53Z pavlenko $
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#ifndef GEOMETRY_HPP
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#define GEOMETRY_HPP
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#include "vertex_vector.hpp"
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#include "vertex_transform.hpp"
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#include "ctrans.hpp"
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#include "geom_util.hpp"
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#include <boost/shared_ptr.hpp>
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#include <boost/utility.hpp>
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namespace mapnik
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{
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enum {
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Point = 1,
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LineString = 2,
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Polygon = 3,
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};
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template <typename T>
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class geometry : private boost::noncopyable
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{
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public:
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typedef T vertex_type;
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typedef typename vertex_type::type value_type;
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private:
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int srid_;
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public:
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geometry (int srid=-1)
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: srid_(srid) {}
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int srid() const
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{
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return srid_;
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}
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virtual int type() const=0;
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virtual bool hit_test(value_type x,value_type y) const=0;
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virtual void label_position(double *x, double *y) const=0;
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virtual void move_to(value_type x,value_type y)=0;
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virtual void line_to(value_type x,value_type y)=0;
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virtual void transform(const mapnik::CoordTransform& t)=0;
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virtual unsigned num_points() const = 0;
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virtual unsigned vertex(double* x, double* y)=0;
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virtual void rewind(unsigned )=0;
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virtual ~geometry() {}
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};
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template <typename T>
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class point : public geometry<T>
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{
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typedef geometry<T> geometry_base;
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typedef typename geometry<T>::vertex_type vertex_type;
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typedef typename geometry<T>::value_type value_type;
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private:
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vertex_type pt_;
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public:
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point(int srid)
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: geometry<T>(srid)
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{}
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int type() const
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{
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return Point;
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}
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void label_position(double *x, double *y) const
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{
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*x = pt_.x;
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*y = pt_.y;
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}
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void move_to(value_type x,value_type y)
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{
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pt_.x = x;
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pt_.y = y;
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}
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void line_to(value_type ,value_type ) {}
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void transform(const mapnik::CoordTransform& t)
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{
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t.forward_x(&pt_.x);
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t.forward_y(&pt_.y);
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}
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unsigned num_points() const
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{
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return 1;
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}
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unsigned vertex(double* x, double* y)
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{
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*x = pt_.x;
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*y = pt_.y;
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return SEG_LINETO;
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}
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void rewind(unsigned ) {}
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bool hit_test(value_type x,value_type y) const
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{
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return false;
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}
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virtual ~point() {}
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};
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template <typename T, template <typename> class Container=vertex_vector>
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class polygon : public geometry<T>
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{
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typedef geometry<T> geometry_base;
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typedef typename geometry<T>::vertex_type vertex_type;
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typedef typename geometry_base::value_type value_type;
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typedef Container<vertex_type> container_type;
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private:
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container_type cont_;
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mutable unsigned itr_;
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public:
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polygon(int srid)
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: geometry_base(srid),
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itr_(0)
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{}
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int type() const
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{
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return Polygon;
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}
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void label_position(double *x, double *y) const
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{
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unsigned size = cont_.size();
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if (size < 3)
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{
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cont_.get_vertex(0,x,y);
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return;
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}
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value_type x0,y0,x1,y1;
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double ai;
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double atmp = 0;
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double xtmp = 0;
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double ytmp = 0;
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unsigned i,j;
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for (i = size-1,j = 0; j < size; i = j, ++j)
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{
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cont_.get_vertex(i,&x0,&y0);
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cont_.get_vertex(j,&x1,&y1);
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ai = x0 * y1 - x1 * y0;
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atmp += ai;
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xtmp += (x1 + x0) * ai;
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ytmp += (y1 + y0) * ai;
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}
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if (atmp != 0)
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{
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*x = xtmp/(3*atmp);
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*y = ytmp /(3*atmp);
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return;
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}
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*x=x0;
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*y=y0;
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}
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void line_to(value_type x,value_type y)
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{
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cont_.push_back(x,y,SEG_LINETO);
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}
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void move_to(value_type x,value_type y)
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{
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cont_.push_back(x,y,SEG_MOVETO);
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}
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void transform(mapnik::CoordTransform const& t)
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{
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unsigned size = cont_.size();
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for (unsigned pos=0; pos < size; ++pos)
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{
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cont_.transform_at(pos,t);
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}
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}
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unsigned num_points() const
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{
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return cont_.size();
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}
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unsigned vertex(double* x, double* y)
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{
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return cont_.get_vertex(itr_++,x,y);
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}
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void rewind(unsigned )
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{
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itr_=0;
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}
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bool hit_test(value_type x,value_type y) const
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{
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return false;
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}
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virtual ~polygon() {}
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};
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template <typename T, template <typename> class Container=vertex_vector>
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class line_string : public geometry<T>
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{
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typedef geometry<T> geometry_base;
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typedef typename geometry_base::value_type value_type;
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typedef typename geometry<T>::vertex_type vertex_type;
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typedef Container<vertex_type> container_type;
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private:
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container_type cont_;
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mutable unsigned itr_;
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public:
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line_string(int srid)
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: geometry_base(srid),
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itr_(0)
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{}
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int type() const
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{
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return LineString;
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}
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void label_position(double *x, double *y) const
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{
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// calculate mid point on line string
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unsigned size = cont_.size();
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if (size == 1)
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{
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cont_.get_vertex(0,x,y);
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}
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else if (size == 2)
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{
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double x0;
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double y0;
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double x1;
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double y1;
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cont_.get_vertex(0,&x0,&y0);
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cont_.get_vertex(1,&x1,&y1);
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*x = 0.5 * (x1 + x0);
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*y = 0.5 * (y1 + y0);
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}
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else
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{
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double x0;
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double y0;
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double x1;
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double y1;
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double len=0.0;
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for (unsigned pos = 1; pos < size; ++pos)
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{
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cont_.get_vertex(pos-1,&x0,&y0);
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cont_.get_vertex(pos,&x1,&y1);
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double dx = x1 - x0;
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double dy = y1 - y0;
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len += sqrt(dx * dx + dy * dy);
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}
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double midlen = 0.5 * len;
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double dist = 0.0;
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for (unsigned pos = 1; pos < size;++pos)
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{
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cont_.get_vertex(pos-1,&x0,&y0);
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cont_.get_vertex(pos,&x1,&y1);
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double dx = x1 - x0;
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double dy = y1 - y0;
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double seg_len = sqrt(dx * dx + dy * dy);
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if (( dist + seg_len) >= midlen)
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{
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double r = (midlen - dist)/seg_len;
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*x = x0 + (x1 - x0) * r;
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*y = y0 + (y1 - y0) * r;
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break;
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}
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dist += seg_len;
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}
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}
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}
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void line_to(value_type x,value_type y)
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{
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cont_.push_back(x,y,SEG_LINETO);
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}
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void move_to(value_type x,value_type y)
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{
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cont_.push_back(x,y,SEG_MOVETO);
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}
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void transform(mapnik::CoordTransform const& t)
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{
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unsigned size = cont_.size();
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for (unsigned pos=0; pos < size; ++pos)
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{
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cont_.transform_at(pos,t);
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}
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}
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unsigned num_points() const
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{
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return cont_.size();
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}
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unsigned vertex(double* x, double* y)
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{
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return cont_.get_vertex(itr_++,x,y);
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}
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void rewind(unsigned )
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{
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itr_=0;
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}
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bool hit_test(value_type x,value_type y) const
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{
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return false;
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}
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virtual ~line_string() {}
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};
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typedef point<vertex2d> point_impl;
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typedef line_string<vertex2d,vertex_vector> line_string_impl;
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typedef polygon<vertex2d,vertex_vector> polygon_impl;
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typedef geometry<vertex2d> geometry_type;
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typedef boost::shared_ptr<geometry_type> geometry_ptr;
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}
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#endif //GEOMETRY_HPP
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