288 lines
8.3 KiB
C++
288 lines
8.3 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2015 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#include "shape_io.hpp"
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/make_unique.hpp>
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#include <mapnik/datasource.hpp>
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#include <mapnik/util/is_clockwise.hpp>
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#include <mapnik/geometry_correct.hpp>
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using mapnik::datasource_exception;
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const std::string shape_io::SHP = ".shp";
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const std::string shape_io::SHX = ".shx";
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const std::string shape_io::DBF = ".dbf";
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const std::string shape_io::INDEX = ".index";
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shape_io::shape_io(std::string const& shape_name, bool open_index)
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: type_(shape_null),
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shp_(shape_name + SHP),
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shx_(shape_name + SHX),
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dbf_(shape_name + DBF),
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reclength_(0),
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id_(0)
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{
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bool ok = (shp_.is_open() && dbf_.is_open());
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if (!ok)
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{
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throw datasource_exception("Shape Plugin: cannot read shape file '" + shape_name + "'");
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}
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if (open_index)
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{
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try
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{
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index_ = std::make_unique<shape_file>(shape_name + INDEX);
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}
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catch (...)
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{
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MAPNIK_LOG_WARN(shape) << "shape_io: Could not open index=" << shape_name << INDEX;
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}
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}
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if (!index_ && !shx_.is_open())
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{
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throw datasource_exception("Shape Plugin: cannot read shape index file '" + shape_name + ".shx'");
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}
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}
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shape_io::~shape_io() {}
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void shape_io::move_to(std::streampos pos)
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{
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shp_.seek(pos);
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id_ = shp_.read_xdr_integer();
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reclength_ = shp_.read_xdr_integer();
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}
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shape_file& shape_io::shp()
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{
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return shp_;
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}
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shape_file& shape_io::shx()
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{
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return shx_;
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}
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dbf_file& shape_io::dbf()
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{
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return dbf_;
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}
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void shape_io::read_bbox(shape_file::record_type & record, mapnik::box2d<double> & bbox)
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{
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double lox = record.read_double();
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double loy = record.read_double();
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double hix = record.read_double();
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double hiy = record.read_double();
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bbox.init(lox, loy, hix, hiy);
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}
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mapnik::geometry::geometry<double> shape_io::read_polyline(shape_file::record_type & record)
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{
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mapnik::geometry::geometry<double> geom; // default empty
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int num_parts = record.read_ndr_integer();
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int num_points = record.read_ndr_integer();
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if (num_parts == 1)
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{
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mapnik::geometry::line_string<double> line;
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line.reserve(num_points);
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record.skip(4);
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for (int i = 0; i < num_points; ++i)
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{
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double x = record.read_double();
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double y = record.read_double();
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line.emplace_back(x, y);
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}
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geom = std::move(line);
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}
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else
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{
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std::vector<int> parts;
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parts.resize(num_parts);
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std::for_each(parts.begin(), parts.end(), [&](int & part) { part = record.read_ndr_integer();});
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int start, end;
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mapnik::geometry::multi_line_string<double> multi_line;
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multi_line.reserve(num_parts);
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for (int k = 0; k < num_parts; ++k)
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{
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start = parts[k];
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if (k == num_parts - 1)
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{
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end = num_points;
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}
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else
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{
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end = parts[k + 1];
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}
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mapnik::geometry::line_string<double> line;
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line.reserve(end - start);
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for (int j = start; j < end; ++j)
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{
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double x = record.read_double();
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double y = record.read_double();
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line.emplace_back(x, y);
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}
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multi_line.push_back(std::move(line));
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}
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geom = std::move(multi_line);
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}
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return geom;
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}
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mapnik::geometry::geometry<double> shape_io::read_polyline_parts(shape_file::record_type & record, std::vector<std::pair<int, int>> const& parts)
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{
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mapnik::geometry::geometry<double> geom; // default empty
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int total_num_parts = record.read_ndr_integer();
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int num_parts = parts.size();
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mapnik::geometry::multi_line_string<double> multi_line;
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multi_line.reserve(num_parts);
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for (int k = 0; k < num_parts; ++k)
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{
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int start = parts[k].first;
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int end = parts[k].second;
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unsigned pos = 4 + 32 + 8 + 4 * total_num_parts + start * 16;
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record.set_pos(pos);
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mapnik::geometry::line_string<double> line;
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line.reserve(end - start);
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for (int j = start; j < end; ++j)
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{
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double x = record.read_double();
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double y = record.read_double();
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line.emplace_back(x, y);
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}
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multi_line.push_back(std::move(line));
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}
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geom = std::move(multi_line);
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return geom;
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}
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mapnik::geometry::geometry<double> shape_io::read_polygon(shape_file::record_type & record)
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{
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mapnik::geometry::geometry<double> geom; // default empty
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int num_parts = record.read_ndr_integer();
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int num_points = record.read_ndr_integer();
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std::vector<int> parts;
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parts.resize(num_parts);
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std::for_each(parts.begin(), parts.end(), [&](int & part) { part = record.read_ndr_integer();});
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mapnik::geometry::polygon<double> poly;
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mapnik::geometry::multi_polygon<double> multi_poly;
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for (int k = 0; k < num_parts; ++k)
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{
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int start = parts[k];
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int end;
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if (k == num_parts - 1) end = num_points;
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else end = parts[k + 1];
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mapnik::geometry::linear_ring<double> ring;
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ring.reserve(end - start);
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for (int j = start; j < end; ++j)
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{
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double x = record.read_double();
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double y = record.read_double();
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ring.emplace_back(x, y);
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}
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if (k == 0)
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{
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poly.push_back(std::move(ring));
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}
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else if (mapnik::util::is_clockwise(ring))
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{
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multi_poly.emplace_back(std::move(poly));
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poly.clear();
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poly.push_back(std::move(ring));
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}
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else
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{
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poly.push_back(std::move(ring));
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}
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}
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if (multi_poly.size() > 0) // multi
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{
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multi_poly.emplace_back(std::move(poly));
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geom = std::move(multi_poly);
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}
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else
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{
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geom = std::move(poly);
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}
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mapnik::geometry::correct(geom);
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return geom;
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}
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mapnik::geometry::geometry<double> shape_io::read_polygon_parts(shape_file::record_type & record, std::vector<std::pair<int,int>> const& parts)
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{
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mapnik::geometry::geometry<double> geom; // default empty
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int total_num_parts = record.read_ndr_integer();
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mapnik::geometry::polygon<double> poly;
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mapnik::geometry::multi_polygon<double> multi_poly;
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int num_parts = parts.size();
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for (int k = 0; k < num_parts; ++k)
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{
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int start = parts[k].first;
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int end = parts[k].second;
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unsigned pos = 4 + 32 + 8 + 4 * total_num_parts + start * 16;
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record.set_pos(pos);
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mapnik::geometry::linear_ring<double> ring;
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ring.reserve(end - start);
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for (int j = start; j < end; ++j)
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{
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double x = record.read_double();
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double y = record.read_double();
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ring.emplace_back(x, y);
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}
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if (k == 0)
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{
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poly.push_back(std::move(ring));
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}
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else if (mapnik::util::is_clockwise(ring))
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{
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multi_poly.emplace_back(std::move(poly));
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poly.clear();
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poly.push_back(std::move(ring));
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}
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else
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{
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poly.push_back(std::move(ring));
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}
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}
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if (multi_poly.size() > 0) // multi
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{
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multi_poly.emplace_back(std::move(poly));
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geom = std::move(multi_poly);
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}
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else
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{
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geom = std::move(poly);
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}
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mapnik::geometry::correct(geom);
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return geom;
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}
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