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to be rendered. This allows for a large extent (larger than can be
rendered into a single image in memory) to be rendered out as tiles.
Since the full extent is used for the placement calculations text
crossing tile boundaries will be consistent.
This method is a little inefficient when a large number of labels need
placed, an improved method would be to cache these placements between
tiles, but the attached is a start.
c++ users should simple call the render method with a start X and Y
coordinate specified,
for (int TileX = 0;TileX < 5;++TileX)
{
for(int TileY = 0;TileY < 5; ++TileY)
{
int TileSize=250;
int StartX = TileX*TileSize;
int StartY = TileY*TileSize;
Image32 buf(TileSize,TileSize);
agg_renderer<Image32> ren(m,buf,StartX,StartY);
ren.apply();
char name[324];
sprintf(name,"tile_%d_%d.png",TileX,TileY);
ImageUtils::save_to_file(name,"png",buf);
}
}
python users should call render_tile_to_file
for y in range(tile_count_y):
for x in range(tile_count_x):
if not os.path.exists("tiles/%d/%d/" % (map_scale, y)):
os.makedirs("tiles/%d/%d/" % (map_scale, y))
render_tile_to_file(m, x*tile_size, y*tile_size, tile_size, tile_size,
'tiles/%d/%d/%d.png' % (map_scale,y,x), 'png')
75 lines
2.7 KiB
C++
75 lines
2.7 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) 2006 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/image_reader.hpp>
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#include <mapnik/image_util.hpp>
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#include "raster_featureset.hpp"
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template <typename LookupPolicy>
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raster_featureset<LookupPolicy>::raster_featureset(LookupPolicy const& policy,
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query const& q)
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: policy_(policy),
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id_(1),
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extent_(q.get_bbox()),
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curIter_(policy_.query(extent_)),
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endIter_(policy_.end())
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{}
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template <typename LookupPolicy>
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raster_featureset<LookupPolicy>::~raster_featureset() {}
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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(new Feature(+id_));
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try
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{
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std::auto_ptr<ImageReader> reader(get_image_reader(curIter_->format(),curIter_->file()));
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if (reader.get())
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{
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int image_width=reader->width();
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int image_height=reader->height();
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if (image_width>0 && image_height>0)
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{
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CoordTransform t(image_width,image_height,curIter_->envelope(),0,0);
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Envelope<double> intersect=extent_.intersect(curIter_->envelope());
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Envelope<double> ext=t.forward(intersect);
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ImageData32 image((int)ext.width(),(int)ext.height());
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reader->read((int)ext.minx(),(int)ext.miny(),image);
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feature->set_raster(raster_ptr(new raster(intersect,image)));
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}
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}
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}
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catch (...)
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{
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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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template class raster_featureset<single_file_policy>;
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