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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 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
*
*****************************************************************************/
#include "shape_io.hpp"
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/datasource.hpp>
// boost
#include <boost/make_shared.hpp>
using mapnik::datasource_exception;
using mapnik::geometry_type;
const std::string shape_io::SHP = ".shp";
const std::string shape_io::DBF = ".dbf";
const std::string shape_io::INDEX = ".index";
shape_io::shape_io(std::string const& shape_name, bool open_index)
: 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("Shape Plugin: cannot read shape file '" + shape_name + "'");
}
if (open_index)
{
try
{
index_= boost::make_shared<shape_file>(shape_name + INDEX);
}
catch (...)
{
MAPNIK_LOG_WARN(shape) << "shape_io: Could not open index=" << shape_name << INDEX;
}
}
}
shape_io::~shape_io() {}
void shape_io::move_to(std::streampos pos)
{
shp_.seek(pos);
id_ = shp_.read_xdr_integer();
reclength_ = shp_.read_xdr_integer();
}
shape_file& shape_io::shp()
{
return shp_;
}
dbf_file& shape_io::dbf()
{
return dbf_;
}
void shape_io::read_bbox(shape_file::record_type & record, mapnik::box2d<double> & bbox)
{
double lox = record.read_double();
double loy = record.read_double();
double hix = record.read_double();
double hiy = record.read_double();
bbox.init(lox, loy, hix, hiy);
}
void shape_io::read_polyline( shape_file::record_type & record, mapnik::geometry_container & geom)
{
int num_parts = record.read_ndr_integer();
int num_points = record.read_ndr_integer();
if (num_parts == 1)
{
std::auto_ptr<geometry_type> line(new geometry_type(mapnik::LineString));
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);
}
geom.push_back(line);
}
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)
{
std::auto_ptr<geometry_type> line(new geometry_type(mapnik::LineString));
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);
}
geom.push_back(line);
}
}
}
void shape_io::read_polygon(shape_file::record_type & record, mapnik::geometry_container & geom)
{
int num_parts = record.read_ndr_integer();
int num_points = record.read_ndr_integer();
std::vector<int> parts(num_parts);
for (int i = 0; i < num_parts; ++i)
{
parts[i] = record.read_ndr_integer();
}
for (int k = 0; k < num_parts; ++k)
{
std::auto_ptr<geometry_type> poly(new geometry_type(mapnik::Polygon));
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);
}
poly->close_path();
geom.push_back(poly);
}
}
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