363 lines
10 KiB
C++
363 lines
10 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2006 Artem Pavlenko
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*****************************************************************************/
|
|
|
|
|
|
//$Id: geometry.hpp 39 2005-04-10 20:39:53Z pavlenko $
|
|
|
|
#ifndef GEOMETRY_HPP
|
|
#define GEOMETRY_HPP
|
|
|
|
// mapnik
|
|
#include <mapnik/vertex_vector.hpp>
|
|
#include <mapnik/ctrans.hpp>
|
|
#include <mapnik/geom_util.hpp>
|
|
// boost
|
|
#include <boost/shared_ptr.hpp>
|
|
#include <boost/utility.hpp>
|
|
#include <boost/ptr_container/ptr_vector.hpp>
|
|
|
|
namespace mapnik {
|
|
enum GeomType {
|
|
Point = 1,
|
|
LineString = 2,
|
|
Polygon = 3
|
|
};
|
|
|
|
template <typename T>
|
|
class geometry : private boost::noncopyable
|
|
{
|
|
public:
|
|
typedef T vertex_type;
|
|
typedef typename vertex_type::type value_type;
|
|
public:
|
|
geometry () {}
|
|
|
|
Envelope<double> envelope()
|
|
{
|
|
Envelope<double> result;
|
|
double x,y;
|
|
rewind(0);
|
|
for (unsigned i=0;i<num_points();++i)
|
|
{
|
|
vertex(&x,&y);
|
|
if (i==0)
|
|
{
|
|
result.init(x,y,x,y);
|
|
}
|
|
else
|
|
{
|
|
result.expand_to_include(x,y);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
virtual int type() const=0;
|
|
virtual bool hit_test(value_type x,value_type y, double tol) const=0;
|
|
virtual void label_position(double *x, double *y) const=0;
|
|
virtual void move_to(value_type x,value_type y)=0;
|
|
virtual void line_to(value_type x,value_type y)=0;
|
|
virtual unsigned num_points() const = 0;
|
|
virtual unsigned vertex(double* x, double* y) const=0;
|
|
virtual void rewind(unsigned) const=0;
|
|
virtual void set_capacity(size_t size)=0;
|
|
virtual ~geometry() {}
|
|
};
|
|
|
|
template <typename T>
|
|
class point : public geometry<T>
|
|
{
|
|
typedef geometry<T> geometry_base;
|
|
typedef typename geometry<T>::vertex_type vertex_type;
|
|
typedef typename geometry<T>::value_type value_type;
|
|
private:
|
|
vertex_type pt_;
|
|
public:
|
|
point() : geometry<T>() {}
|
|
|
|
int type() const
|
|
{
|
|
return Point;
|
|
}
|
|
|
|
void label_position(double *x, double *y) const
|
|
{
|
|
*x = pt_.x;
|
|
*y = pt_.y;
|
|
}
|
|
|
|
void move_to(value_type x,value_type y)
|
|
{
|
|
pt_.x = x;
|
|
pt_.y = y;
|
|
}
|
|
|
|
void line_to(value_type ,value_type ) {}
|
|
|
|
unsigned num_points() const
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
unsigned vertex(double* x, double* y) const
|
|
{
|
|
*x = pt_.x;
|
|
*y = pt_.y;
|
|
return SEG_LINETO;
|
|
}
|
|
|
|
void rewind(unsigned ) const {}
|
|
|
|
bool hit_test(value_type x,value_type y, double tol) const
|
|
{
|
|
return point_in_circle(pt_.x,pt_.y, x,y,tol);
|
|
}
|
|
|
|
void set_capacity(size_t) {}
|
|
virtual ~point() {}
|
|
};
|
|
|
|
template <typename T, template <typename> class Container=vertex_vector2>
|
|
class polygon : public geometry<T>
|
|
{
|
|
typedef geometry<T> geometry_base;
|
|
typedef typename geometry<T>::vertex_type vertex_type;
|
|
typedef typename geometry_base::value_type value_type;
|
|
typedef Container<vertex_type> container_type;
|
|
private:
|
|
container_type cont_;
|
|
mutable unsigned itr_;
|
|
public:
|
|
polygon()
|
|
: geometry_base(),
|
|
itr_(0)
|
|
{}
|
|
|
|
int type() const
|
|
{
|
|
return Polygon;
|
|
}
|
|
|
|
void label_position(double *x, double *y) const
|
|
{
|
|
unsigned size = cont_.size();
|
|
if (size < 3)
|
|
{
|
|
cont_.get_vertex(0,x,y);
|
|
return;
|
|
}
|
|
|
|
double ai;
|
|
double atmp = 0;
|
|
double xtmp = 0;
|
|
double ytmp = 0;
|
|
double x0 =0;
|
|
double y0 =0;
|
|
double x1 =0;
|
|
double y1 =0;
|
|
double ox =0;
|
|
double oy =0;
|
|
|
|
unsigned i;
|
|
|
|
// Use first point as origin to improve numerical accuracy
|
|
cont_.get_vertex(0,&ox,&oy);
|
|
|
|
for (i = 0; i < size-1; i++)
|
|
{
|
|
cont_.get_vertex(i,&x0,&y0);
|
|
cont_.get_vertex(i+1,&x1,&y1);
|
|
|
|
x0 -= ox; y0 -= oy;
|
|
x1 -= ox; y1 -= oy;
|
|
|
|
ai = x0 * y1 - x1 * y0;
|
|
atmp += ai;
|
|
xtmp += (x1 + x0) * ai;
|
|
ytmp += (y1 + y0) * ai;
|
|
}
|
|
if (atmp != 0)
|
|
{
|
|
*x = (xtmp/(3*atmp)) + ox;
|
|
*y = (ytmp/(3*atmp)) + oy;
|
|
return;
|
|
}
|
|
*x=x0;
|
|
*y=y0;
|
|
}
|
|
|
|
void line_to(value_type x,value_type y)
|
|
{
|
|
cont_.push_back(x,y,SEG_LINETO);
|
|
}
|
|
|
|
void move_to(value_type x,value_type y)
|
|
{
|
|
cont_.push_back(x,y,SEG_MOVETO);
|
|
}
|
|
|
|
unsigned num_points() const
|
|
{
|
|
return cont_.size();
|
|
}
|
|
|
|
unsigned vertex(double* x, double* y) const
|
|
{
|
|
return cont_.get_vertex(itr_++,x,y);
|
|
}
|
|
|
|
void rewind(unsigned ) const
|
|
{
|
|
itr_=0;
|
|
}
|
|
|
|
bool hit_test(value_type x,value_type y, double) const
|
|
{
|
|
return point_inside_path(x,y,cont_.begin(),cont_.end());
|
|
}
|
|
|
|
void set_capacity(size_t size)
|
|
{
|
|
cont_.set_capacity(size);
|
|
}
|
|
virtual ~polygon() {}
|
|
};
|
|
|
|
template <typename T, template <typename> class Container=vertex_vector2>
|
|
class line_string : public geometry<T>
|
|
{
|
|
typedef geometry<T> geometry_base;
|
|
typedef typename geometry_base::value_type value_type;
|
|
typedef typename geometry<T>::vertex_type vertex_type;
|
|
typedef Container<vertex_type> container_type;
|
|
private:
|
|
container_type cont_;
|
|
mutable unsigned itr_;
|
|
public:
|
|
line_string()
|
|
: geometry_base(),
|
|
itr_(0)
|
|
{}
|
|
|
|
int type() const
|
|
{
|
|
return LineString;
|
|
}
|
|
void label_position(double *x, double *y) const
|
|
{
|
|
// calculate mid point on line string
|
|
double x0=0;
|
|
double y0=0;
|
|
double x1=0;
|
|
double y1=0;
|
|
|
|
unsigned size = cont_.size();
|
|
if (size == 1)
|
|
{
|
|
cont_.get_vertex(0,x,y);
|
|
}
|
|
else if (size == 2)
|
|
{
|
|
|
|
cont_.get_vertex(0,&x0,&y0);
|
|
cont_.get_vertex(1,&x1,&y1);
|
|
*x = 0.5 * (x1 + x0);
|
|
*y = 0.5 * (y1 + y0);
|
|
}
|
|
else
|
|
{
|
|
double len=0.0;
|
|
for (unsigned pos = 1; pos < size; ++pos)
|
|
{
|
|
cont_.get_vertex(pos-1,&x0,&y0);
|
|
cont_.get_vertex(pos,&x1,&y1);
|
|
double dx = x1 - x0;
|
|
double dy = y1 - y0;
|
|
len += sqrt(dx * dx + dy * dy);
|
|
}
|
|
double midlen = 0.5 * len;
|
|
double dist = 0.0;
|
|
for (unsigned pos = 1; pos < size;++pos)
|
|
{
|
|
cont_.get_vertex(pos-1,&x0,&y0);
|
|
cont_.get_vertex(pos,&x1,&y1);
|
|
double dx = x1 - x0;
|
|
double dy = y1 - y0;
|
|
double seg_len = sqrt(dx * dx + dy * dy);
|
|
if (( dist + seg_len) >= midlen)
|
|
{
|
|
double r = (midlen - dist)/seg_len;
|
|
*x = x0 + (x1 - x0) * r;
|
|
*y = y0 + (y1 - y0) * r;
|
|
break;
|
|
}
|
|
dist += seg_len;
|
|
}
|
|
}
|
|
}
|
|
void line_to(value_type x,value_type y)
|
|
{
|
|
cont_.push_back(x,y,SEG_LINETO);
|
|
}
|
|
|
|
void move_to(value_type x,value_type y)
|
|
{
|
|
cont_.push_back(x,y,SEG_MOVETO);
|
|
}
|
|
|
|
unsigned num_points() const
|
|
{
|
|
return cont_.size();
|
|
}
|
|
|
|
unsigned vertex(double* x, double* y) const
|
|
{
|
|
return cont_.get_vertex(itr_++,x,y);
|
|
}
|
|
|
|
void rewind(unsigned ) const
|
|
{
|
|
itr_=0;
|
|
}
|
|
|
|
bool hit_test(value_type x,value_type y, double tol) const
|
|
{
|
|
return point_on_path(x,y,cont_.begin(),cont_.end(),tol);
|
|
}
|
|
|
|
void set_capacity(size_t size)
|
|
{
|
|
cont_.set_capacity(size);
|
|
}
|
|
virtual ~line_string() {}
|
|
};
|
|
|
|
typedef point<vertex2d> point_impl;
|
|
typedef line_string<vertex2d,vertex_vector2> line_string_impl;
|
|
typedef polygon<vertex2d,vertex_vector2> polygon_impl;
|
|
|
|
typedef geometry<vertex2d> geometry2d;
|
|
typedef boost::shared_ptr<geometry2d> geometry_ptr;
|
|
typedef boost::ptr_vector<geometry2d> geometry_containter;
|
|
}
|
|
|
|
#endif //GEOMETRY_HPP
|