172 lines
6 KiB
C++
172 lines
6 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) 2021 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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// stl
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#include <iostream>
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#include <cassert>
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/feature_factory.hpp>
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#include <mapnik/unicode.hpp>
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// boost
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#include "shape_featureset.hpp"
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#include "shape_utils.hpp"
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using mapnik::context_ptr;
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using mapnik::feature_factory;
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template<typename filterT>
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shape_featureset<filterT>::shape_featureset(filterT const& filter,
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std::string const& shape_name,
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std::set<std::string> const& attribute_names,
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std::string const& encoding,
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int row_limit)
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: filter_(filter)
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, shape_(shape_name, false)
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, query_ext_()
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, feature_bbox_()
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, tr_(new transcoder(encoding))
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, shx_file_length_(0)
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, row_limit_(row_limit)
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, count_(0)
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, ctx_(std::make_shared<mapnik::context_type>())
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{
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if (!shape_.shx().is_open())
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{
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throw mapnik::datasource_exception("Shape Plugin: can't open '" + shape_name + ".shx' file");
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}
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shape_file::record_type shx_header(100);
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shape_.shx().read_record(shx_header);
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shx_header.skip(6 * 4);
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shx_file_length_ = shx_header.read_xdr_integer();
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setup_attributes(ctx_, attribute_names, shape_name, shape_, attr_ids_);
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}
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template<typename filterT>
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feature_ptr shape_featureset<filterT>::next()
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{
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if (row_limit_ && count_ >= row_limit_)
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{
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return feature_ptr();
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}
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std::streampos position_limit = 2 * shx_file_length_ - 2 * sizeof(int);
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while (shape_.shx().is_good() && shape_.shx().pos() <= position_limit)
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{
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int offset = shape_.shx().read_xdr_integer();
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int record_length = shape_.shx().read_xdr_integer();
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shape_.move_to(2 * offset);
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mapnik::value_integer feature_id = shape_.id();
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assert(record_length == shape_.reclength_);
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shape_file::record_type record(record_length * 2);
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shape_.shp().read_record(record);
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int type = record.read_ndr_integer();
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// skip null shapes
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if (type == shape_io::shape_null)
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continue;
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feature_ptr feature(feature_factory::create(ctx_, feature_id));
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switch (type)
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{
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case shape_io::shape_point:
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case shape_io::shape_pointm:
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case shape_io::shape_pointz: {
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double x = record.read_double();
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double y = record.read_double();
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if (!filter_.pass(mapnik::box2d<double>(x, y, x, y)))
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continue;
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feature->set_geometry(mapnik::geometry::point<double>(x, y));
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break;
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}
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case shape_io::shape_multipoint:
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case shape_io::shape_multipointm:
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case shape_io::shape_multipointz: {
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shape_io::read_bbox(record, feature_bbox_);
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if (!filter_.pass(feature_bbox_))
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continue;
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int num_points = record.read_ndr_integer();
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mapnik::geometry::multi_point<double> multi_point;
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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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multi_point.emplace_back(mapnik::geometry::point<double>(x, y));
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}
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feature->set_geometry(std::move(multi_point));
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break;
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}
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case shape_io::shape_polyline:
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case shape_io::shape_polylinem:
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case shape_io::shape_polylinez: {
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shape_io::read_bbox(record, feature_bbox_);
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if (!filter_.pass(feature_bbox_))
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continue;
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feature->set_geometry(shape_io::read_polyline(record));
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break;
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}
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case shape_io::shape_polygon:
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case shape_io::shape_polygonm:
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case shape_io::shape_polygonz: {
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shape_io::read_bbox(record, feature_bbox_);
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if (!filter_.pass(feature_bbox_))
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continue;
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feature->set_geometry(shape_io::read_polygon(record));
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break;
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}
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default:
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MAPNIK_LOG_DEBUG(shape) << "shape_featureset: Unsupported type" << type;
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return feature_ptr();
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}
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if (attr_ids_.size())
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{
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shape_.dbf().move_to(shape_.id_);
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try
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{
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for (auto id : attr_ids_)
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{
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shape_.dbf().add_attribute(id, *tr_, *feature); // TODO optimize!!!
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}
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}
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catch (...)
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{
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MAPNIK_LOG_ERROR(shape) << "Shape Plugin: error processing attributes";
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}
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}
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++count_;
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return feature;
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}
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MAPNIK_LOG_DEBUG(shape) << "shape_featureset: Total shapes read=" << count_;
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return feature_ptr();
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}
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template<typename filterT>
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shape_featureset<filterT>::~shape_featureset()
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{}
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template class shape_featureset<mapnik::filter_in_box>;
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template class shape_featureset<mapnik::filter_at_point>;
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