mapnik/plugins/input/shape/shape_io.cpp

/*****************************************************************************
 * 
 * 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: shape_io.cc 26 2005-03-29 19:18:59Z pavlenko $

#include "shape_io.hpp"
#include "shape.hpp"


using mapnik::datasource_exception;
const std::string shape_io::SHP = ".shp";
const std::string shape_io::DBF = ".dbf";

shape_io::shape_io(const std::string& shape_name)
   : type_(shape_null),
     shp_(shape_name + SHP),
     dbf_(shape_name + DBF),
     reclength_(0),
     id_(0)
{
   bool ok = (shp_.is_open() && dbf_.is_open());
   if (!ok)
   { 
      throw datasource_exception("cannot read shape file");
   }
}

shape_io::~shape_io()
{
   shp_.close();
   dbf_.close();
}

void shape_io::move_to (int pos)
{
   shp_.seek(pos);
   id_ = shp_.read_xdr_integer();
   reclength_ = shp_.read_xdr_integer();
   type_ = shp_.read_ndr_integer();

   if (shp_.is_eof()) {
       id_ = 0;
       reclength_ = 0;
       type_ = shape_null;
   }

   if (type_ != shape_point && type_ != shape_pointm && type_ != shape_pointz)
   {
      shp_.read_envelope(cur_extent_);
   }
}

int shape_io::type() const
{
   return type_;
}

const Envelope<double>& shape_io::current_extent() const
{
   return cur_extent_;
}

shape_file& shape_io::shp()
{
   return shp_;
}

shape_file& shape_io::shx()
{
   return shx_;
}


dbf_file& shape_io::dbf()
{
   return dbf_;
}

geometry2d * shape_io::read_polyline()
{    
   using mapnik::line_string_impl;
   shape_record record(reclength_*2-36);
   shp_.read_record(record);
   int num_parts=record.read_ndr_integer();
   int num_points=record.read_ndr_integer();
   geometry2d * line = new line_string_impl;
   line->set_capacity(num_points + num_parts);
   if (num_parts == 1)
   {
      line->set_capacity(num_points + 1);
      record.skip(4);
      double x=record.read_double();
      double y=record.read_double();
      line->move_to(x,y);
      for (int i=1;i<num_points;++i)
      {
         x=record.read_double();
         y=record.read_double();
         line->line_to(x,y);
      }
   }
   else
   {
      std::vector<int> parts(num_parts);
      for (int i=0;i<num_parts;++i)
      {
         parts[i]=record.read_ndr_integer();
      }

      int start,end;
      for (int k=0;k<num_parts;++k)
      {
         start=parts[k];
         if (k==num_parts-1)
            end=num_points;
         else
            end=parts[k+1];
	    
         double x=record.read_double();
         double y=record.read_double();
         line->move_to(x,y);
	    
         for (int j=start+1;j<end;++j)
         {
            x=record.read_double();
            y=record.read_double();
            line->line_to(x,y);
         }
      }
   }
   return line;
}

geometry2d * shape_io::read_polylinem()
{    
   using mapnik::line_string_impl;
   shape_record record(reclength_*2-36);
   shp_.read_record(record);
   int num_parts=record.read_ndr_integer();
   int num_points=record.read_ndr_integer();
   geometry2d * line = new line_string_impl;
   line->set_capacity(num_points + num_parts);
   if (num_parts == 1)
   {
      record.skip(4);
      double x=record.read_double();
      double y=record.read_double();
      line->move_to(x,y);
      for (int i=1;i<num_points;++i)
      {
         x=record.read_double();
         y=record.read_double();
         line->line_to(x,y);
      }
   }
   else
   {
      std::vector<int> parts(num_parts);
      for (int i=0;i<num_parts;++i)
      {
         parts[i]=record.read_ndr_integer();
      }

      int start,end;
      for (int k=0;k<num_parts;++k)
      {
         start=parts[k];
         if (k==num_parts-1)
            end=num_points;
         else
            end=parts[k+1];
	    
         double x=record.read_double();
         double y=record.read_double();
         line->move_to(x,y);
	    
         for (int j=start+1;j<end;++j)
         {
            x=record.read_double();
            y=record.read_double();
            line->line_to(x,y);
         }
      }
   }
   // m-range
   //double m0=record.read_double();
   //double m1=record.read_double();
    
   //for (int i=0;i<num_points;++i)
   //{
   //   double m=record.read_double();
   //}
    
   return line;
}

geometry2d * shape_io::read_polylinez()
{
   using mapnik::line_string_impl;
   shape_record record(reclength_*2-36);
   shp_.read_record(record);
   int num_parts=record.read_ndr_integer();
   int num_points=record.read_ndr_integer();
   geometry2d * line = new line_string_impl;
   line->set_capacity(num_points + num_parts);
   if (num_parts == 1)
   {
      record.skip(4);
      double x=record.read_double();
      double y=record.read_double();
      line->move_to(x,y);
      for (int i=1;i<num_points;++i)
      {
         x=record.read_double();
         y=record.read_double();
         line->line_to(x,y);
      }
   }
   else
   {
      std::vector<int> parts(num_parts);
      for (int i=0;i<num_parts;++i)
      {
         parts[i]=record.read_ndr_integer();
      }

      int start,end;
      for (int k=0;k<num_parts;++k)
      {
         start=parts[k];
         if (k==num_parts-1)
            end=num_points;
         else
            end=parts[k+1];
	    
         double x=record.read_double();
         double y=record.read_double();
         line->move_to(x,y);
	    
         for (int j=start+1;j<end;++j)
         {
            x=record.read_double();
            y=record.read_double();
            line->line_to(x,y);
         }
      }
   }
   // z-range
   //double z0=record.read_double();
   //double z1=record.read_double();
   //for (int i=0;i<num_points;++i)
   // {
   //	double z=record.read_double();
   // }
    
   // m-range
   //double m0=record.read_double();
   //double m1=record.read_double();
    
   //for (int i=0;i<num_points;++i)
   //{
   //   double m=record.read_double();
   //} 
   return line;
}

geometry2d * shape_io::read_polygon()
{
   using mapnik::polygon_impl;
   shape_record record(reclength_*2-36);
   shp_.read_record(record);
   int num_parts=record.read_ndr_integer();
   int num_points=record.read_ndr_integer();
   std::vector<int> parts(num_parts);
   geometry2d * poly = new polygon_impl;
   poly->set_capacity(num_points + num_parts);
   for (int i=0;i<num_parts;++i)
   {
      parts[i]=record.read_ndr_integer();
   }

   for (int k=0;k<num_parts;k++)
   {
      int start=parts[k];
      int end;
      if (k==num_parts-1)
      {
         end=num_points;
      }
      else
      {
         end=parts[k+1];
      }
      double x=record.read_double();
      double y=record.read_double();
      poly->move_to(x,y);
   
      for (int j=start+1;j<end;j++)
      {
         x=record.read_double();
         y=record.read_double();
         poly->line_to(x,y);
      }
   }
   return poly;
}

geometry2d * shape_io::read_polygonm()
{
   using mapnik::polygon_impl;
   shape_record record(reclength_*2-36);
   shp_.read_record(record);
   int num_parts=record.read_ndr_integer();
   int num_points=record.read_ndr_integer();
   std::vector<int> parts(num_parts);
   geometry2d * poly = new polygon_impl;
   poly->set_capacity(num_points + num_parts);
   for (int i=0;i<num_parts;++i)
   {
      parts[i]=record.read_ndr_integer();
   }
    
   for (int k=0;k<num_parts;k++)
   {
      int start=parts[k];
      int end;
      if (k==num_parts-1)
      {
         end=num_points;
      }
      else
      {
         end=parts[k+1];
      }
      double x=record.read_double();
      double y=record.read_double();
      poly->move_to(x,y);
   
      for (int j=start+1;j<end;j++)
      {
         x=record.read_double();
         y=record.read_double();
         poly->line_to(x,y);
      }
   }
   // m-range
   //double m0=record.read_double();
   //double m1=record.read_double();
    
   //for (int i=0;i<num_points;++i)
   //{
   //   double m=record.read_double();
   //} 
   return poly;
}

geometry2d * shape_io::read_polygonz()
{
   using mapnik::polygon_impl;
   shape_record record(reclength_*2-36);
   shp_.read_record(record);
   int num_parts=record.read_ndr_integer();
   int num_points=record.read_ndr_integer();
   std::vector<int> parts(num_parts);
   geometry2d * poly=new polygon_impl;
   poly->set_capacity(num_points + num_parts);
   for (int i=0;i<num_parts;++i)
   {
      parts[i]=record.read_ndr_integer();
   }
    
   for (int k=0;k<num_parts;k++)
   {
      int start=parts[k];
      int end;
      if (k==num_parts-1)
      {
         end=num_points;
      }
      else
      {
         end=parts[k+1];
      }
      double x=record.read_double();
      double y=record.read_double();
      poly->move_to(x,y);
   
      for (int j=start+1;j<end;j++)
      {
         x=record.read_double();
         y=record.read_double();
         poly->line_to(x,y);
      }
   }
   // z-range
   //double z0=record.read_double();
   //double z1=record.read_double();
   //for (int i=0;i<num_points;++i)
   //{
   //	double z=record.read_double();
   //}
    
   // m-range
   //double m0=record.read_double();
   //double m1=record.read_double();
    
   //for (int i=0;i<num_points;++i)
   //{
   //   double m=record.read_double();
   //} 
   return poly;
}