155 lines
6.1 KiB
C++
155 lines
6.1 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) 2011 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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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/ctrans.hpp>
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#include <mapnik/image_reader.hpp>
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#include <mapnik/image_util.hpp>
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#include <mapnik/feature_factory.hpp>
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// boost
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#include <boost/algorithm/string/replace.hpp>
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#include "raster_featureset.hpp"
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using mapnik::query;
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using mapnik::image_reader;
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using mapnik::Feature;
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using mapnik::feature_ptr;
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using mapnik::image_data_32;
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using mapnik::raster;
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using mapnik::feature_factory;
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template <typename LookupPolicy>
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raster_featureset<LookupPolicy>::raster_featureset(LookupPolicy const& policy,
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box2d<double> const& extent,
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query const& q)
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: policy_(policy),
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feature_id_(1),
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ctx_(boost::make_shared<mapnik::context_type>()),
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extent_(extent),
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bbox_(q.get_bbox()),
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curIter_(policy_.begin()),
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endIter_(policy_.end())
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{
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}
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template <typename LookupPolicy>
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raster_featureset<LookupPolicy>::~raster_featureset()
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{
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}
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template <typename LookupPolicy>
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feature_ptr raster_featureset<LookupPolicy>::next()
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{
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if (curIter_ != endIter_)
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{
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feature_ptr feature(feature_factory::create(ctx_,feature_id_++));
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try
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{
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std::auto_ptr<image_reader> reader(mapnik::get_image_reader(curIter_->file(),curIter_->format()));
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MAPNIK_LOG_DEBUG(raster) << "raster_featureset: Reader=" << curIter_->format() << "," << curIter_->file()
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<< ",size(" << curIter_->width() << "," << curIter_->height() << ")";
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if (reader.get())
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{
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int image_width = policy_.img_width(reader->width());
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int image_height = policy_.img_height(reader->height());
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if (image_width > 0 && image_height > 0)
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{
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mapnik::CoordTransform t(image_width, image_height, extent_, 0, 0);
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box2d<double> intersect = bbox_.intersect(curIter_->envelope());
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box2d<double> ext = t.forward(intersect);
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box2d<double> rem = policy_.transform(ext);
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if (ext.width() > 0.5 && ext.height() > 0.5 )
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{
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// select minimum raster containing whole ext
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int x_off = static_cast<int>(floor(ext.minx()));
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int y_off = static_cast<int>(floor(ext.miny()));
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int end_x = static_cast<int>(ceil(ext.maxx()));
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int end_y = static_cast<int>(ceil(ext.maxy()));
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// clip to available data
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if (x_off < 0)
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x_off = 0;
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if (y_off < 0)
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y_off = 0;
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if (end_x > image_width)
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end_x = image_width;
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if (end_y > image_height)
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end_y = image_height;
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int width = end_x - x_off;
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int height = end_y - y_off;
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// calculate actual box2d of returned raster
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box2d<double> feature_raster_extent(rem.minx() + x_off,
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rem.miny() + y_off,
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rem.maxx() + x_off + width,
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rem.maxy() + y_off + height);
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intersect = t.backward(feature_raster_extent);
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image_data_32 image(width,height);
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reader->read(x_off, y_off, image);
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feature->set_raster(boost::make_shared<raster>(intersect, image,reader->premultiplied_alpha()));
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}
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}
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}
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}
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catch (mapnik::image_reader_exception const& ex)
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{
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MAPNIK_LOG_ERROR(raster) << "Raster Plugin: image reader exception caught: " << ex.what();
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}
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catch (std::exception const& ex)
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{
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MAPNIK_LOG_ERROR(raster) << "Raster Plugin: " << ex.what();
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}
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catch (...)
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{
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MAPNIK_LOG_ERROR(raster) << "Raster Plugin: exception caught";
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}
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++curIter_;
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return feature;
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}
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return feature_ptr();
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}
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std::string tiled_multi_file_policy::interpolate(std::string const& pattern, int x, int y) const
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{
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// TODO: make from some sort of configurable interpolation
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int tms_y = tile_stride_ * ((image_height_ / tile_size_) - y - 1);
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int tms_x = tile_stride_ * x;
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std::string xs = (boost::format("%03d/%03d/%03d") % (tms_x / 1000000) % ((tms_x / 1000) % 1000) % (tms_x % 1000)).str();
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std::string ys = (boost::format("%03d/%03d/%03d") % (tms_y / 1000000) % ((tms_y / 1000) % 1000) % (tms_y % 1000)).str();
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std::string rv(pattern);
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boost::algorithm::replace_all(rv, "${x}", xs);
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boost::algorithm::replace_all(rv, "${y}", ys);
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return rv;
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}
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template class raster_featureset<single_file_policy>;
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template class raster_featureset<tiled_file_policy>;
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template class raster_featureset<tiled_multi_file_policy>;
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