152 lines
4.7 KiB
C++
152 lines
4.7 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) 2007 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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//$Id$
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#include "rasterlite_featureset.hpp"
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// mapnik
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#include <mapnik/image_util.hpp>
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using mapnik::query;
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using mapnik::coord2d;
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using mapnik::box2d;
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using mapnik::Feature;
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using mapnik::feature_ptr;
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using mapnik::CoordTransform;
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using mapnik::geometry_type;
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using mapnik::query;
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rasterlite_featureset::rasterlite_featureset(void* dataset, rasterlite_query q)
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: dataset_(dataset),
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gquery_(q),
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first_(true)
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{
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rasterliteSetBackgroundColor(dataset_, 255, 0, 255);
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rasterliteSetTransparentColor(dataset_, 255, 0, 255);
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}
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rasterlite_featureset::~rasterlite_featureset()
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "Rasterlite Plugin: closing dataset" << std::endl;
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#endif
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rasterliteClose(dataset_);
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}
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feature_ptr rasterlite_featureset::next()
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{
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if (first_)
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{
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first_ = false;
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query *q = boost::get<query>(&gquery_);
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if(q) {
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return get_feature(*q);
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} else {
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coord2d *p = boost::get<coord2d>(&gquery_);
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if(p) {
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return get_feature_at_point(*p);
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}
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}
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// should never reach here
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}
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return feature_ptr();
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}
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feature_ptr rasterlite_featureset::get_feature(mapnik::query const& q)
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "Rasterlite Plugin: get_feature" << std::endl;
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#endif
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feature_ptr feature(new Feature(1));
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double x0, y0, x1, y1;
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rasterliteGetExtent (dataset_, &x0, &y0, &x1, &y1);
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box2d<double> raster_extent(x0,y0,x1,y1);
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box2d<double> intersect = raster_extent.intersect(q.get_bbox());
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const int width = static_cast<int>(boost::get<0>(q.resolution()) * intersect.width() + 0.5);
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const int height = static_cast<int>(boost::get<0>(q.resolution()) * intersect.height() + 0.5);
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const double pixel_size = (intersect.width() >= intersect.height()) ?
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(intersect.width() / (double) width) : (intersect.height() / (double) height);
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#ifdef MAPNIK_DEBUG
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std::clog << "Rasterlite Plugin: Raster extent=" << raster_extent << std::endl;
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std::clog << "Rasterlite Plugin: View extent=" << q.get_bbox() << std::endl;
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std::clog << "Rasterlite Plugin: Intersect extent=" << intersect << std::endl;
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std::clog << "Rasterlite Plugin: Query resolution=" << boost::get<0>(q.resolution())
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<< "," << boost::get<1>(q.resolution()) << std::endl;
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std::clog << "Rasterlite Plugin: Size=" << width << " " << height << std::endl;
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std::clog << "Rasterlite Plugin: Pixel Size=" << pixel_size << std::endl;
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#endif
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if (width > 0 && height > 0)
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{
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int size = 0;
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void *raster = 0;
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if (rasterliteGetRawImageByRect(dataset_,
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intersect.minx(), intersect.miny(), intersect.maxx(), intersect.maxy(),
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pixel_size, width, height, GAIA_RGBA_ARRAY, &raster, &size) == RASTERLITE_OK)
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{
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if (size > 0)
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{
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mapnik::image_data_32 image(width, height);
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image.set(0xffffffff);
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unsigned char* raster_data = static_cast<unsigned char*>(raster);
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unsigned char* image_data = image.getBytes();
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memcpy (image_data, raster_data, size);
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feature->set_raster(mapnik::raster_ptr(new mapnik::raster(intersect,image)));
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free (raster);
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#ifdef MAPNIK_DEBUG
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std::clog << "Rasterlite Plugin: done" << std::endl;
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#endif
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}
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else
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{
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#ifdef MAPNIK_DEBUG
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std::clog << "Rasterlite Plugin: error=" << rasterliteGetLastError (dataset_) << std::endl;
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#endif
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}
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}
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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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feature_ptr rasterlite_featureset::get_feature_at_point(mapnik::coord2d const& pt)
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{
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return feature_ptr();
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}
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