f1393cc019
bool hit_test(double x, double y, double tol);
2. added image_view(unsigned x, unsigned y, unsigned width, unsigned height)
allowing to select region from image data e.g (in Python):
im = Image(2048,2048)
view = im.view(0,0,256,256)
save_to_file(filename,type, view)
3. changed envelope method to return vy value in datasource classes
4. features_at_point impl for shape and postgis plug-ins
310 lines
8.1 KiB
C++
310 lines
8.1 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) 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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//$Id: map.cpp 17 2005-03-08 23:58:43Z pavlenko $,
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#include <mapnik/style.hpp>
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#include <mapnik/datasource.hpp>
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#include <mapnik/projection.hpp>
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#include <mapnik/layer.hpp>
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#include <mapnik/map.hpp>
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namespace mapnik
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{
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Map::Map()
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: width_(400),
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height_(400),
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srs_("+proj=latlong +datum=WGS84") {}
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Map::Map(int width,int height, std::string const& srs)
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: width_(width),
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height_(height),
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srs_(srs),
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background_(Color(255,255,255)) {}
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Map::Map(const Map& rhs)
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: width_(rhs.width_),
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height_(rhs.height_),
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srs_(rhs.srs_),
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background_(rhs.background_),
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styles_(rhs.styles_),
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layers_(rhs.layers_),
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currentExtent_(rhs.currentExtent_) {}
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Map& Map::operator=(const Map& rhs)
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{
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if (this==&rhs) return *this;
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width_=rhs.width_;
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height_=rhs.height_;
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srs_=rhs.srs_;
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background_=rhs.background_;
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styles_=rhs.styles_;
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layers_=rhs.layers_;
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return *this;
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}
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Map::style_iterator Map::begin_styles() const
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{
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return styles_.begin();
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}
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Map::style_iterator Map::end_styles() const
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{
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return styles_.end();
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}
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bool Map::insert_style(std::string const& name,feature_type_style const& style)
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{
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return styles_.insert(make_pair(name,style)).second;
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}
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void Map::remove_style(std::string const& name)
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{
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styles_.erase(name);
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}
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feature_type_style const& Map::find_style(std::string const& name) const
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{
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std::map<std::string,feature_type_style>::const_iterator itr = styles_.find(name);
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if (itr!=styles_.end())
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return itr->second;
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static feature_type_style default_style;
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return default_style;
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}
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size_t Map::layerCount() const
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{
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return layers_.size();
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}
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void Map::addLayer(const Layer& l)
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{
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layers_.push_back(l);
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}
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void Map::removeLayer(size_t index)
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{
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layers_.erase(layers_.begin()+index);
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}
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void Map::remove_all()
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{
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layers_.clear();
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styles_.clear();
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}
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const Layer& Map::getLayer(size_t index) const
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{
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return layers_[index];
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}
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Layer& Map::getLayer(size_t index)
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{
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return layers_[index];
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}
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std::vector<Layer> const& Map::layers() const
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{
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return layers_;
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}
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std::vector<Layer> & Map::layers()
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{
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return layers_;
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}
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unsigned Map::getWidth() const
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{
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return width_;
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}
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unsigned Map::getHeight() const
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{
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return height_;
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}
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void Map::setWidth(unsigned width)
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{
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if (width >= MIN_MAPSIZE && width <= MAX_MAPSIZE)
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{
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width_=width;
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fixAspectRatio();
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}
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}
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void Map::setHeight(unsigned height)
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{
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if (height >= MIN_MAPSIZE && height <= MAX_MAPSIZE)
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{
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height_=height;
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fixAspectRatio();
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}
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}
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void Map::resize(unsigned width,unsigned height)
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{
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if (width >= MIN_MAPSIZE && width <= MAX_MAPSIZE &&
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height >= MIN_MAPSIZE && height <= MAX_MAPSIZE)
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{
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width_=width;
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height_=height;
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fixAspectRatio();
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}
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}
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std::string const& Map::srs() const
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{
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return srs_;
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}
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void Map::set_srs(std::string const& srs)
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{
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srs_ = srs;
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}
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void Map::setBackground(const Color& c)
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{
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background_=c;
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}
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const Color& Map::getBackground() const
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{
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return background_;
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}
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void Map::zoom(double factor)
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{
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coord2d center = currentExtent_.center();
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double w = factor * currentExtent_.width();
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double h = factor * currentExtent_.height();
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currentExtent_ = Envelope<double>(center.x - 0.5 * w,
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center.y - 0.5 * h,
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center.x + 0.5 * w,
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center.y + 0.5 * h);
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fixAspectRatio();
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}
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void Map::zoom_all()
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{
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try
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{
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projection proj0(srs_);
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Envelope<double> ext;
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bool first = true;
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std::vector<Layer>::const_iterator itr = layers_.begin();
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std::vector<Layer>::const_iterator end = layers_.end();
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while (itr != end)
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{
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std::string const& layer_srs = itr->srs();
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projection proj1(layer_srs);
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proj_transform prj_trans(proj0,proj1);
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Envelope<double> layerExt = itr->envelope();
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double x0 = layerExt.minx();
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double y0 = layerExt.miny();
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double z0 = 0.0;
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double x1 = layerExt.maxx();
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double y1 = layerExt.maxy();
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double z1 = 0.0;
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prj_trans.backward(x0,y0,z0);
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prj_trans.backward(x1,y1,z1);
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Envelope<double> layerExt2(x0,y0,x1,y1);
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#ifdef MAPNIK_DEBUG
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std::clog << " layer1 - > " << layerExt << "\n";
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std::clog << " layer2 - > " << layerExt2 << "\n";
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#endif
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if (first)
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{
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ext = layerExt2;
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first = false;
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}
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else
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{
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ext.expand_to_include(layerExt2);
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}
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++itr;
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}
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zoomToBox(ext);
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}
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catch (proj_init_error & ex)
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{
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std::clog << ex.what() << '\n';
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}
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}
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void Map::zoomToBox(const Envelope<double> &box)
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{
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currentExtent_=box;
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fixAspectRatio();
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}
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void Map::fixAspectRatio()
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{
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double ratio1 = (double) width_ / (double) height_;
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double ratio2 = currentExtent_.width() / currentExtent_.height();
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if (ratio2 > ratio1)
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{
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currentExtent_.height(currentExtent_.width() / ratio1);
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}
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else if (ratio2 < ratio1)
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{
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currentExtent_.width(currentExtent_.height() * ratio1);
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}
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}
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const Envelope<double>& Map::getCurrentExtent() const
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{
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return currentExtent_;
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}
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void Map::pan(int x,int y)
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{
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int dx = x - int(0.5 * width_);
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int dy = int(0.5 * height_) - y;
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double s = width_/currentExtent_.width();
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double minx = currentExtent_.minx() + dx/s;
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double maxx = currentExtent_.maxx() + dx/s;
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double miny = currentExtent_.miny() + dy/s;
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double maxy = currentExtent_.maxy() + dy/s;
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currentExtent_.init(minx,miny,maxx,maxy);
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}
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void Map::pan_and_zoom(int x,int y,double factor)
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{
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pan(x,y);
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zoom(factor);
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}
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double Map::scale() const
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{
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if (width_>0)
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return currentExtent_.width()/width_;
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return currentExtent_.width();
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}
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CoordTransform Map::view_transform() const
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{
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return CoordTransform(width_,height_,currentExtent_);
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}
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Map::~Map() {}
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}
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