mapnik/src/map.cpp

/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2006 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

//$Id: map.cpp 17 2005-03-08 23:58:43Z pavlenko $

#include "style.hpp"
#include "datasource.hpp"
#include "layer.hpp"
#include "map.hpp"

namespace mapnik
{
    Map::Map()
        : width_(400),
          height_(400),
          srid_(-1) {}
    Map::Map(int width,int height,int srid)
        : width_(width),
          height_(height),
          srid_(srid),
          background_(Color(255,255,255)) {}

    Map::Map(const Map& rhs)
        : width_(rhs.width_),
          height_(rhs.height_),
          srid_(rhs.srid_),
          background_(rhs.background_),
          styles_(rhs.styles_),
          layers_(rhs.layers_),
          currentExtent_(rhs.currentExtent_) {}
    
    Map& Map::operator=(const Map& rhs)
    {
        if (this==&rhs) return *this;
        width_=rhs.width_;
        height_=rhs.height_;
        srid_=rhs.srid_;
        background_=rhs.background_;
        styles_=rhs.styles_;
        layers_=rhs.layers_;
        return *this;
    }

    bool Map::insert_style(std::string const& name,feature_type_style const& style) 
    {
        return styles_.insert(make_pair(name,style)).second;
    }
    
    void Map::remove_style(std::string const& name) 
    {
        styles_.erase(name);
    }
    
    feature_type_style const&  Map::find_style(std::string const& name) const
    {
        std::map<std::string,feature_type_style>::const_iterator itr=styles_.find(name);
        if (itr!=styles_.end()) 
            return itr->second;
        static feature_type_style default_style;
        return default_style;
    }
    
    size_t Map::layerCount() const
    {
        return layers_.size();
    }
    
    void Map::addLayer(const Layer& l)
    {
        layers_.push_back(l);
    }
    void Map::removeLayer(size_t index)
    {
        layers_.erase(layers_.begin()+index);
    }

    const Layer& Map::getLayer(size_t index) const
    {
        return layers_[index];
    }

    Layer& Map::getLayer(size_t index)
    {
        return layers_[index];
    }


    std::vector<Layer> const& Map::layers() const
    {
        return layers_;
    }
    
    unsigned Map::getWidth() const
    {
        return width_;
    }

    unsigned Map::getHeight() const
    {
        return height_;
    }
    
    void Map::setWidth(unsigned width)
    {
        if (width >= MIN_MAPSIZE && width <= MAX_MAPSIZE)
        {
            width_=width;
            fixAspectRatio();
        }	
    }

    void Map::setHeight(unsigned height)
    {
        if (height >= MIN_MAPSIZE && height <= MAX_MAPSIZE)
        {
            height_=height;
            fixAspectRatio();
        }
    }
    void Map::resize(unsigned width,unsigned height)
    {
        if (width >= MIN_MAPSIZE && width <= MAX_MAPSIZE &&
            height >= MIN_MAPSIZE && height <= MAX_MAPSIZE)
        {
            width_=width;
            height_=height;
            fixAspectRatio();
        }
    }

    int Map::srid() const
    {
        return srid_;
    }

    void Map::setBackground(const Color& c)
    {
        background_=c;
    }

    const Color& Map::getBackground() const
    {
        return background_;
    }

    void Map::zoom(double factor)
    {
        coord2d center = currentExtent_.center();
        double w = factor * currentExtent_.width();
        double h = factor * currentExtent_.height();
        currentExtent_ = Envelope<double>(center.x - 0.5 * w, center.y - 0.5 * h,
                                          center.x + 0.5 * w, center.y + 0.5 * h);
        fixAspectRatio();
    }
    
    void Map::zoom_all() 
    {
        std::vector<Layer>::const_iterator itr = layers_.begin();
        Envelope<double> ext;
        bool first = true;
        while (itr != layers_.end())
        {
            if (first)
            {
                ext = itr->envelope();
                first = false;
            }
            else 
            {
                ext.expand_to_include(itr->envelope());
            }
            ++itr;
        }
        zoomToBox(ext);
    }

    void Map::zoomToBox(const Envelope<double> &box)
    {
        currentExtent_=box;
        fixAspectRatio();
    }

    void Map::fixAspectRatio()
    {
        double ratio1 = (double) width_ / (double) height_;
        double ratio2 = currentExtent_.width() / currentExtent_.height();
         
        if (ratio2 > ratio1)
        {
            currentExtent_.height(currentExtent_.width() / ratio1);
        }
        else if (ratio2 < ratio1)
        {
            currentExtent_.width(currentExtent_.height() * ratio1);
        }       
    }

    const Envelope<double>& Map::getCurrentExtent() const
    {
        return currentExtent_;
    }

    void Map::pan(int x,int y)
    {
        int dx = x - int(0.5 * width_);
        int dy = int(0.5 * height_) - y;
        double s = width_/currentExtent_.width();
        double minx  = currentExtent_.minx() + dx/s;
        double maxx  = currentExtent_.maxx() + dx/s;
        double miny  = currentExtent_.miny() + dy/s;
        double maxy  = currentExtent_.maxy() + dy/s;
        currentExtent_.init(minx,miny,maxx,maxy);
    }

    void Map::pan_and_zoom(int x,int y,double factor)
    {
        pan(x,y);
        zoom(factor);
    }

    double Map::scale() const
    {
        if (width_>0)
            return currentExtent_.width()/width_;
        return currentExtent_.width();
    }

    Map::~Map() {}
}