mapnik::quad_tree - add methods required for spatial_index construction and serialization

remove utils/shapeindex/quadtree.hpp
This commit is contained in:
artemp 2015-09-29 12:19:19 +01:00
parent 49266fbd56
commit 2f35c71606
2 changed files with 152 additions and 314 deletions

View file

@ -36,14 +36,14 @@ namespace mapnik
template <typename T> template <typename T>
class quad_tree : util::noncopyable class quad_tree : util::noncopyable
{ {
using value_type = T;
struct node struct node
{ {
using value_t = T; using cont_type = std::vector<T>;
using cont_t = std::vector<T>; using iterator = typename cont_type::iterator;
using iterator = typename cont_t::iterator; using const_iterator = typename cont_type::const_iterator;
using const_iterator = typename cont_t::const_iterator;
box2d<double> extent_; box2d<double> extent_;
cont_t cont_; cont_type cont_;
node * children_[4]; node * children_[4];
explicit node(box2d<double> const& ext) explicit node(box2d<double> const& ext)
@ -76,18 +76,28 @@ class quad_tree : util::noncopyable
{ {
return cont_.end(); return cont_.end();
} }
int num_subnodes() const
{
int count = 0;
for (int i = 0; i < 4; ++i)
{
if (children_[i]) ++count;
}
return count;
}
~node () {} ~node () {}
}; };
using nodes_t = std::vector<std::unique_ptr<node> >; using nodes_type = std::vector<std::unique_ptr<node> >;
using cont_t = typename node::cont_t; using cont_type = typename node::cont_type;
using node_data_iterator = typename cont_t::iterator; using node_data_iterator = typename cont_type::iterator;
public: public:
using iterator = typename nodes_t::iterator; using iterator = typename nodes_type::iterator;
using const_iterator = typename nodes_t::const_iterator; using const_iterator = typename nodes_type::const_iterator;
using result_t = typename std::vector<std::reference_wrapper<T> >; using result_type = typename std::vector<std::reference_wrapper<T> >;
using query_iterator = typename result_t::iterator; using query_iterator = typename result_type::iterator;
explicit quad_tree(box2d<double> const& ext, explicit quad_tree(box2d<double> const& ext,
unsigned int max_depth = 8, unsigned int max_depth = 8,
@ -143,9 +153,39 @@ public:
return root_->extent_; return root_->extent_;
} }
int count() const
{
return count_nodes(root_);
}
int count_items() const
{
int count = 0;
count_items(root_, count);
return count;
}
void trim()
{
trim_tree(root_);
}
template <typename OutputStream>
void write(OutputStream & out)
{
char header[16];
std::memset(header,0,16);
header[0]='m';
header[1]='a';
header[2]='p';
header[3]='n';
header[4]='i';
header[5]='k';
out.write(header,16);
write_node(out,root_);
}
private: private:
void query_node(box2d<double> const& box, result_t & result, node * node_) const void query_node(box2d<double> const& box, result_type & result, node * node_) const
{ {
if (node_) if (node_)
{ {
@ -208,10 +248,107 @@ private:
ext[3]=box2d<double>(hix - width * ratio_,hiy - height*ratio_,hix,hiy); ext[3]=box2d<double>(hix - width * ratio_,hiy - height*ratio_,hix,hiy);
} }
void trim_tree(node * n)
{
if (n)
{
for (int i = 0; i < 4; ++i)
{
trim_tree(n->children_[i]);
}
if (n->num_subnodes() == 1 && n->cont_.size() == 0)
{
for (int i = 0; i < 4; ++i)
{
if (n->children_[i])
{
n = n->children_[i];
break;
}
}
}
}
}
int count_nodes(node const* n) const
{
if (!n) return 0;
else
{
int count = 1;
for (int i = 0; i < 4; ++i)
{
count += count_nodes(n->children_[i]);
}
return count;
}
}
void count_items(node const* n,int& count) const
{
if (n)
{
count += n->cont_.size();
for (int i = 0; i < 4; ++i)
{
count_items(n->children_[i],count);
}
}
}
int subnode_offset(node const* n) const
{
int offset = 0;
for (int i = 0; i < 4; i++)
{
if (n->children_[i])
{
offset +=sizeof(box2d<double>) + (n->children_[i]->cont_.size() * sizeof(value_type)) + 3 * sizeof(int);
offset +=subnode_offset(n->children_[i]);
}
}
return offset;
}
template <typename OutputStream>
void write_node(OutputStream & out, node const* n) const
{
if (n)
{
int offset=subnode_offset(n);
int shape_count=n->cont_.size();
int recsize=sizeof(box2d<double>) + 3 * sizeof(int) + shape_count * sizeof(value_type);
std::unique_ptr<char[]> node_record(new char[recsize]);
std::memset(node_record.get(), 0, recsize);
std::memcpy(node_record.get(), &offset, 4);
std::memcpy(node_record.get() + 4, &n->extent_, sizeof(box2d<double>));
std::memcpy(node_record.get() + 36, &shape_count, 4);
for (int i=0; i < shape_count; ++i)
{
memcpy(node_record.get() + 40 + i * sizeof(value_type), &(n->cont_[i]),sizeof(value_type));
}
int num_subnodes=0;
for (int i = 0; i < 4; ++i)
{
if (n->children_[i])
{
++num_subnodes;
}
}
std::memcpy(node_record.get() + 40 + shape_count * sizeof(value_type),&num_subnodes,4);
out.write(node_record.get(),recsize);
for (int i = 0; i < 4; ++i)
{
write_node(out, n->children_[i]);
}
}
}
const unsigned int max_depth_; const unsigned int max_depth_;
const double ratio_; const double ratio_;
result_t query_result_; result_type query_result_;
nodes_t nodes_; nodes_type nodes_;
node * root_; node * root_;
}; };

View file

@ -1,299 +0,0 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 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
*
*****************************************************************************/
#ifndef QUADTREE_HPP
#define QUADTREE_HPP
// stl
#include <cstring>
#include <vector>
#include <fstream>
#include <iostream>
#include <memory>
// mapnik
#include <mapnik/box2d.hpp>
using mapnik::box2d;
using mapnik::coord2d;
template <typename T>
struct quadtree_node
{
using value_type = T;
box2d<double> ext_;
std::vector<value_type> data_;
quadtree_node<value_type>* children_[4];
quadtree_node(box2d<double> const& ext)
: ext_(ext),data_()
{
std::memset(children_, 0, sizeof(quadtree_node<value_type>*)*4);
}
~quadtree_node()
{
for (int i=0;i<4;++i)
{
if (children_[i])
{
delete children_[i],children_[i]=0;
}
}
}
int num_subnodes() const
{
int count=0;
for (int i=0;i<4;++i)
{
if (children_[i])
{
++count;
}
}
return count;
}
};
template <typename T>
class quadtree
{
using value_type = T;
private:
quadtree_node<value_type>* root_;
const int maxdepth_;
const double ratio_;
public:
quadtree(box2d<double> const& extent, int maxdepth, double ratio)
: root_(new quadtree_node<value_type>(extent)),
maxdepth_(maxdepth),
ratio_(ratio) {}
~quadtree()
{
if (root_) delete root_;
}
void insert(value_type const& data,box2d<double> const& item_ext)
{
insert(data,item_ext,root_,maxdepth_);
}
int count() const
{
return count_nodes(root_);
}
int count_items() const
{
int count=0;
count_items(root_,count);
return count;
}
void print() const
{
print(root_);
}
void trim()
{
trim_tree(root_);
}
void write(std::ostream& out)
{
char header[16];
std::memset(header,0,16);
header[0]='m';
header[1]='a';
header[2]='p';
header[3]='n';
header[4]='i';
header[5]='k';
out.write(header,16);
write_node(out,root_);
}
private:
void trim_tree(quadtree_node<value_type>*& node)
{
if (node)
{
for (int i=0;i<4;++i)
{
trim_tree(node->children_[i]);
}
if (node->num_subnodes()==1 && node->data_.size()==0)
{
for (int i=0;i<4;++i)
{
if (node->children_[i])
{
node=node->children_[i];
break;
}
}
}
}
}
int count_nodes(quadtree_node<value_type> const* node) const
{
if (!node)
{
return 0;
}
else
{
int count = 1;
for (int i=0;i<4;++i)
{
count += count_nodes(node->children_[i]);
}
return count;
}
}
void count_items(quadtree_node<value_type> const* node,int& count) const
{
if (node)
{
count += node->data_.size();
for (int i=0;i<4;++i)
{
count_items(node->children_[i],count);
}
}
}
int subnode_offset(quadtree_node<value_type> const* node) const
{
int offset=0;
for (int i = 0; i < 4; i++)
{
if (node->children_[i])
{
offset +=sizeof(box2d<double>)+(node->children_[i]->data_.size()*sizeof(value_type))+3*sizeof(int);
offset +=subnode_offset(node->children_[i]);
}
}
return offset;
}
void write_node(std::ostream& out, quadtree_node<value_type> const* node) const
{
if (node)
{
int offset=subnode_offset(node);
int shape_count=node->data_.size();
int recsize=sizeof(box2d<double>) + 3 * sizeof(int) + shape_count * sizeof(value_type);
std::unique_ptr<char[]> node_record(new char[recsize]);
std::memset(node_record.get(), 0, recsize);
std::memcpy(node_record.get(), &offset, 4);
std::memcpy(node_record.get() + 4, &node->ext_, sizeof(box2d<double>));
std::memcpy(node_record.get() + 36, &shape_count, 4);
for (int i=0; i < shape_count; ++i)
{
memcpy(node_record.get() + 40 + i * sizeof(value_type), &(node->data_[i]),sizeof(value_type));
}
int num_subnodes=0;
for (int i = 0; i < 4; ++i)
{
if (node->children_[i])
{
++num_subnodes;
}
}
std::memcpy(node_record.get() + 40 + shape_count * sizeof(value_type),&num_subnodes,4);
out.write(node_record.get(),recsize);
for (int i = 0;i<4;++i)
{
write_node(out,node->children_[i]);
}
}
}
void print(quadtree_node<value_type> const* node,int level=0) const
{
if (node)
{
typename std::vector<value_type>::const_iterator itr=node->data_.begin();
std::string pad;
for (int i = 0; i < level; ++i)
{
pad+=" ";
}
std::clog<<pad<<"node "<<node<<" extent:"<<node->ext_<<std::endl;
std::clog<<pad;
while(itr!=node->data_.end())
{
std::clog<<*itr<<" ";
++itr;
}
std::clog<<std::endl;
for (int i = 0; i < 4; ++i)
{
print(node->children_[i],level+4);
}
}
}
void insert(value_type const& data,const box2d<double>& item_ext, quadtree_node<value_type> * node,int maxdepth)
{
if (node && node->ext_.contains(item_ext))
{
double width=node->ext_.width();
double height=node->ext_.height();
double lox=node->ext_.minx();
double loy=node->ext_.miny();
double hix=node->ext_.maxx();
double hiy=node->ext_.maxy();
box2d<double> ext[4];
ext[0]=box2d<double>(lox,loy,lox + width * ratio_,loy + height * ratio_);
ext[1]=box2d<double>(hix - width * ratio_,loy,hix,loy + height * ratio_);
ext[2]=box2d<double>(lox,hiy - height*ratio_,lox + width * ratio_,hiy);
ext[3]=box2d<double>(hix - width * ratio_,hiy - height*ratio_,hix,hiy);
if (maxdepth > 1)
{
for (int i = 0; i < 4; ++i)
{
if (ext[i].contains(item_ext))
{
if (!node->children_[i])
{
node->children_[i]=new quadtree_node<value_type>(ext[i]);
}
insert(data,item_ext,node->children_[i],maxdepth-1);
return;
}
}
}
node->data_.push_back(data);
}
}
};
#endif //QUADTREE_HPP