mapnik/plugins/input/raster/raster_featureset.hpp

/*****************************************************************************
 * 
 * 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
 *
 *****************************************************************************/
#ifndef RASTER_FEATURESET_HPP
#define RASTER_FEATURESET_HPP

#include <vector>

#include "raster_datasource.hpp"
#include "raster_info.hpp"

// boost
#include <boost/utility.hpp>
#include <boost/format.hpp>

class single_file_policy
{
    raster_info info_;
public:
    class const_iterator
    {
        enum iterator_e {start,end};
        bool status_;
        const single_file_policy* p_;
    public:
        explicit const_iterator(const single_file_policy* p)
            :status_(start),
             p_(p) {}

        const_iterator()
            :status_(end){}

        const_iterator(const const_iterator& other)
            :status_(other.status_),
             p_(other.p_) {}

        const_iterator& operator++()
        {
            status_=end;
            return *this;
        }

        const raster_info& operator*() const
        {
            return p_->info_;
        }

        const raster_info* operator->() const
        {
            return &(p_->info_);
        }

        bool operator!=(const const_iterator& itr)
        {
            return status_!=itr.status_;
        }
    };

    explicit single_file_policy(const raster_info& info)
        :info_(info) {}

    const_iterator begin()
    {
        return const_iterator(this);
    }

    const_iterator query(const box2d<double>& box)
    {
        if (box.intersects(info_.envelope()))
        {
            return begin();
        }
        return end();
    }

    const_iterator end()
    {
        return const_iterator();
    }

   inline int img_width(int reader_width) const
   {
      return reader_width;
   }

   inline int img_height(int reader_height) const
   {
      return reader_height;
   }

   inline box2d<double> transform(box2d<double> &) const 
   {
      return box2d<double>(0, 0, 0, 0);
   }
};

class tiled_file_policy
{
public:
   
   typedef std::vector<raster_info>::const_iterator const_iterator;
   
   tiled_file_policy(std::string const& file, std::string const& format, unsigned tile_size, 
                     box2d<double> extent, box2d<double> bbox,unsigned width, unsigned height)
   {     
      
      double lox = extent.minx();
      double loy = extent.miny();
   
      int max_x = int(std::ceil(double(width)/double(tile_size)));
      int max_y = int(std::ceil(double(height)/double(tile_size)));

      double pixel_x = extent.width()/double(width);
      double pixel_y = extent.height()/double(height);

#ifdef MAPNIK_DEBUG 
      std::clog << "Raster Plugin: PIXEL SIZE("<< pixel_x << "," << pixel_y << ")" << std::endl;
#endif

      box2d<double> e = bbox.intersect(extent);
      
      for (int x = 0 ; x < max_x ; ++x)
      {
         for (int y = 0 ; y < max_y ; ++y)
         {
            double x0 = lox + x*tile_size*pixel_x;
            double y0 = loy + y*tile_size*pixel_y;
            double x1 = x0 + tile_size*pixel_x;
            double y1 = y0 + tile_size*pixel_y;
            
            if (e.intersects(box2d<double>(x0,y0,x1,y1)))
            {
               box2d<double> tile_box = e.intersect(box2d<double>(x0,y0,x1,y1));            
               raster_info info(file,format,tile_box,tile_size,tile_size);
               infos_.push_back(info);
            }
         }
      }
#ifdef MAPNIK_DEBUG 
      std::clog << "Raster Plugin: INFO SIZE=" << infos_.size() << " " << file << std::endl;
#endif
   }
   
   const_iterator begin()
   {
      return infos_.begin();
   }
      
   const_iterator end()
   {
      return infos_.end();
   }
   
   inline int img_width(int reader_width) const
   {
      return reader_width;
   }

   inline int img_height(int reader_height) const
   {
      return reader_height;
   }

   inline box2d<double> transform(box2d<double> &) const 
   {
      return box2d<double>(0, 0, 0, 0);
   }

private:

   std::vector<raster_info> infos_;
};

class tiled_multi_file_policy
{
public:
   
   typedef std::vector<raster_info>::const_iterator const_iterator;
   
   tiled_multi_file_policy(std::string const& file_pattern, std::string const& format, unsigned tile_size, 
                           box2d<double> extent, box2d<double> bbox,unsigned width, unsigned height,
                           unsigned tile_stride)
      : image_width_(width), image_height_(height), tile_size_(tile_size), tile_stride_(tile_stride)
   {     
      
      double lox = extent.minx();
      double loy = extent.miny();
   
      int max_x = int(std::ceil(double(width)/double(tile_size)));
      int max_y = int(std::ceil(double(height)/double(tile_size)));

      double pixel_x = extent.width()/double(width);
      double pixel_y = extent.height()/double(height);

#ifdef MAPNIK_DEBUG 
      std::clog << "Raster Plugin: PIXEL SIZE("<< pixel_x << "," << pixel_y << ")" << std::endl;
#endif

      // intersection of query with extent => new query
      box2d<double> e = bbox.intersect(extent);
      
      const int x_min = int(std::floor((e.minx() - lox) / (tile_size * pixel_x)));
      const int y_min = int(std::floor((e.miny() - loy) / (tile_size * pixel_y)));
      const int x_max = int(std::ceil((e.maxx() - lox) / (tile_size * pixel_x)));
      const int y_max = int(std::ceil((e.maxy() - loy) / (tile_size * pixel_y)));

      for (int x = x_min ; x < x_max ; ++x)
      {
         for (int y = y_min ; y < y_max ; ++y)
         {
            // x0, y0, x1, y1 => projection-space image coordinates.
            double x0 = lox + x*tile_size*pixel_x;
            double y0 = loy + y*tile_size*pixel_y;
            double x1 = x0 + tile_size*pixel_x;
            double y1 = y0 + tile_size*pixel_y;
            
            // check if it intersects the query
            if (e.intersects(box2d<double>(x0,y0,x1,y1)))
            {
               // tile_box => intersection of tile with query in projection-space.
               box2d<double> tile_box = e.intersect(box2d<double>(x0,y0,x1,y1));
               std::string file = interpolate(file_pattern, x, y);
               raster_info info(file,format,tile_box,tile_size,tile_size);
               infos_.push_back(info);
            }
         }
      }
#ifdef MAPNIK_DEBUG 
      std::clog << "Raster Plugin: INFO SIZE=" << infos_.size() << " " << file_pattern << std::endl;
#endif
   }
   
   const_iterator begin()
   {
      return infos_.begin();
   }
      
   const_iterator end()
   {
      return infos_.end();
   }
   
   inline int img_width(int) const
   {
      return image_width_;
   }

   inline int img_height(int) const
   {
      return image_height_;
   }

   inline box2d<double> transform(box2d<double> &box) const 
   {
      int x_offset = int(std::floor(box.minx() / tile_size_));
      int y_offset = int(std::floor(box.miny() / tile_size_));
      box2d<double> rem(x_offset * tile_size_, y_offset * tile_size_,
                        x_offset * tile_size_, y_offset * tile_size_);
      box.init(box.minx() - rem.minx(),
               box.miny() - rem.miny(),
               box.maxx() - rem.maxx(),
               box.maxy() - rem.maxy());
      return rem;
   }

private:

   std::string interpolate(std::string const &pattern, int x, int y) const;

   unsigned int image_width_, image_height_, tile_size_, tile_stride_;
   std::vector<raster_info> infos_;
};

template <typename LookupPolicy>
class raster_featureset : public mapnik::Featureset
{
   typedef typename LookupPolicy::const_iterator iterator_type;
   LookupPolicy policy_;
   int feature_id_;
   mapnik::box2d<double> extent_;
   mapnik::box2d<double> bbox_;
   iterator_type curIter_;
   iterator_type endIter_;
public:
   raster_featureset(LookupPolicy const& policy,box2d<double> const& exttent, mapnik::query const& q);
   virtual ~raster_featureset();
   mapnik::feature_ptr next();
};

#endif //RASTER_FEATURESET_HPP