mapnik/plugins/input/ogr/ogr_converter.cpp

/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2007 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
 *
 *****************************************************************************/
//$Id$

#include <mapnik/global.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/geometry.hpp>
#include <mapnik/feature.hpp>
#include <mapnik/feature_layer_desc.hpp>
#include <mapnik/wkb.hpp>
#include <mapnik/unicode.hpp>

// ogr
#include "ogr_converter.hpp"

using mapnik::feature_ptr;
using mapnik::geometry_utils;
using mapnik::geometry_type;

void ogr_converter::convert_geometry (OGRGeometry* geom, feature_ptr feature, bool multiple_geometries)
{
  switch (wkbFlatten (geom->getGeometryType()))
  {
  case wkbPoint:
      convert_point (static_cast<OGRPoint*>(geom), feature);
      break;
  case wkbLineString:
      convert_linestring (static_cast<OGRLineString*>(geom), feature);
      break;
  case wkbPolygon:
      convert_polygon (static_cast<OGRPolygon*>(geom), feature);
      break;
  case wkbMultiPoint:
      if (multiple_geometries)
          convert_multipoint_2 (static_cast<OGRMultiPoint*>(geom), feature);
      else
          // Todo - using convert_multipoint_2 until we have proper multipoint handling in convert_multipoint
          // http://trac.mapnik.org/ticket/458
          //convert_multipoint (static_cast<OGRMultiPoint*>(geom), feature);
          convert_multipoint_2 (static_cast<OGRMultiPoint*>(geom), feature);
      break;
  case wkbMultiLineString:
      if (multiple_geometries)
          convert_multilinestring_2 (static_cast<OGRMultiLineString*>(geom), feature);
      else
          convert_multilinestring (static_cast<OGRMultiLineString*>(geom), feature);

      break;
  case wkbMultiPolygon:
      if (multiple_geometries)
          convert_multipolygon_2 (static_cast<OGRMultiPolygon*>(geom), feature);
      else
          convert_multipolygon (static_cast<OGRMultiPolygon*>(geom), feature);
      break;
  case wkbGeometryCollection:
      convert_collection (static_cast<OGRGeometryCollection*>(geom), feature, multiple_geometries);
      break;
  case wkbLinearRing:
      convert_linestring (static_cast<OGRLinearRing*>(geom), feature);
      break;
  case wkbNone:
  case wkbUnknown:
  default:
#ifdef MAPNIK_DEBUG
      std::clog << "OGR Plugin: unknown <ogr> geometry_type=" << wkbFlatten (geom->getGeometryType()) << std::endl;
#endif
      break;
  }  
}

void ogr_converter::convert_point (OGRPoint* geom, feature_ptr feature)
{
    geometry_type * point = new geometry_type(mapnik::Point);
    point->move_to (geom->getX(), geom->getY());
    feature->add_geometry (point);
}

void ogr_converter::convert_linestring (OGRLineString* geom, feature_ptr feature)
{
    int num_points = geom->getNumPoints ();
    geometry_type * line = new geometry_type(mapnik::LineString);
    line->set_capacity (num_points);
    line->move_to (geom->getX (0), geom->getY (0));
    for (int i=1;i<num_points;++i)
    {
        line->line_to (geom->getX (i), geom->getY (i));
    }
    feature->add_geometry (line);
}

void ogr_converter::convert_polygon (OGRPolygon* geom, feature_ptr feature)
{
    OGRLinearRing* exterior = geom->getExteriorRing ();
    int num_points = exterior->getNumPoints ();
    int num_interior = geom->getNumInteriorRings ();
    int capacity = 0;
    for (int r=0;r<num_interior;r++)
    {
        OGRLinearRing* interior = geom->getInteriorRing (r);
        capacity += interior->getNumPoints ();
    }    
    
    geometry_type * poly = new geometry_type(mapnik::Polygon);
    poly->set_capacity (num_points + capacity);
    poly->move_to (exterior->getX (0), exterior->getY (0));
    for (int i=1;i<num_points;++i)
    {
        poly->line_to (exterior->getX (i), exterior->getY (i));
    }
    for (int r=0;r<num_interior;r++)
    {
        OGRLinearRing* interior = geom->getInteriorRing (r);
        num_points = interior->getNumPoints ();
        poly->move_to(interior->getX (0), interior->getY (0));
        for (int i=1;i<num_points;++i)
        {
            poly->line_to(interior->getX (i), interior->getY (i));
        }
    }
    feature->add_geometry (poly);
}

void ogr_converter::convert_multipoint (OGRMultiPoint* geom, feature_ptr feature)
{
    int num_geometries = geom->getNumGeometries ();
    geometry_type * point = new geometry_type(mapnik::Point);
    
    for (int i=0;i<num_geometries;i++)
    {
        OGRPoint* ogrpoint = static_cast<OGRPoint*>(geom->getGeometryRef (i));
        point->move_to (ogrpoint->getX(), ogrpoint->getY());
        //Todo - need to accept multiple points per mapnik::Point
    }
    
    // Todo - this only gets last point
    feature->add_geometry (point);
}

void ogr_converter::convert_multipoint_2 (OGRMultiPoint* geom, feature_ptr feature)
{
    int num_geometries = geom->getNumGeometries ();
    for (int i=0;i<num_geometries;i++)
    {
        convert_point (static_cast<OGRPoint*>(geom->getGeometryRef (i)), feature);
    }
}

void ogr_converter::convert_multilinestring (OGRMultiLineString* geom, feature_ptr feature)
{
    int num_geometries = geom->getNumGeometries ();

    int num_points = 0;
    for (int i=0;i<num_geometries;i++)
    {
        OGRLineString* ls = static_cast<OGRLineString*>(geom->getGeometryRef (i));
        num_points += ls->getNumPoints ();
    }

    geometry_type * line = new geometry_type(mapnik::LineString);
    line->set_capacity (num_points);
    
    for (int i=0;i<num_geometries;i++)
    {
        OGRLineString* ls = static_cast<OGRLineString*>(geom->getGeometryRef (i));
        num_points = ls->getNumPoints ();
        line->move_to (ls->getX (0), ls->getY (0));
        for (int i=1;i<num_points;++i)
        {
            line->line_to (ls->getX (i), ls->getY (i));
        }
    }

    feature->add_geometry (line);
}

void ogr_converter::convert_multilinestring_2 (OGRMultiLineString* geom, feature_ptr feature)
{
    int num_geometries = geom->getNumGeometries ();
    for (int i=0;i<num_geometries;i++)
    {
        convert_linestring (static_cast<OGRLineString*>(geom->getGeometryRef (i)), feature);
    }
}

void ogr_converter::convert_multipolygon (OGRMultiPolygon* geom, feature_ptr feature)
{
    int num_geometries = geom->getNumGeometries ();

    int capacity = 0;
    for (int i=0;i<num_geometries;i++)
    {
        OGRPolygon* p = static_cast<OGRPolygon*>(geom->getGeometryRef (i));
        OGRLinearRing* exterior = p->getExteriorRing ();
        capacity += exterior->getNumPoints ();
        for (int r=0;r<p->getNumInteriorRings ();r++)
        {
            OGRLinearRing* interior = p->getInteriorRing (r);
            capacity += interior->getNumPoints ();
        }    
    }

    geometry_type * poly = new geometry_type(mapnik::Polygon);
    poly->set_capacity (capacity);

    for (int i=0;i<num_geometries;i++)
    {
        OGRPolygon* p = static_cast<OGRPolygon*>(geom->getGeometryRef (i));
        OGRLinearRing* exterior = p->getExteriorRing ();
        int num_points = exterior->getNumPoints ();
        int num_interior = p->getNumInteriorRings ();
        poly->move_to (exterior->getX (0), exterior->getY (0));
        for (int i=1;i<num_points;++i)
        {
            poly->line_to (exterior->getX (i), exterior->getY (i));
        }
        for (int r=0;r<num_interior;r++)
        {
            OGRLinearRing* interior = p->getInteriorRing (r);
            num_points = interior->getNumPoints ();
            poly->move_to(interior->getX (0), interior->getY (0));
            for (int i=1;i<num_points;++i)
            {
                poly->line_to(interior->getX (i), interior->getY (i));
            }
        }
    }

    feature->add_geometry (poly);
}

void ogr_converter::convert_multipolygon_2 (OGRMultiPolygon* geom, feature_ptr feature)
{
    int num_geometries = geom->getNumGeometries ();
    for (int i=0;i<num_geometries;i++)
    {
        convert_polygon (static_cast<OGRPolygon*>(geom->getGeometryRef (i)), feature);
    }
}

void ogr_converter::convert_collection (OGRGeometryCollection* geom, feature_ptr feature, bool multiple_geometries)
{
    int num_geometries = geom->getNumGeometries ();
    for (int i=0;i<num_geometries;i++)
    {
        OGRGeometry* g = geom->getGeometryRef (i);
        if (g != NULL)
        {
            convert_geometry (g, feature, multiple_geometries);
        }
    }
}