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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 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
*
*****************************************************************************/
#ifndef MAPNIK_LAYER_HPP
#define MAPNIK_LAYER_HPP
// mapnik
#include <mapnik/feature.hpp>
#include <mapnik/datasource.hpp>
// stl
#include <vector>
namespace mapnik
{
/*!
* @brief A Mapnik map layer.
*
* Create a layer with a named string and, optionally, an srs string either
* with a Proj.4 epsg code ('+init=epsg:<code>') or with a Proj.4 literal
* ('+proj=<literal>'). If no srs is specified it will default to
* '+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs'
*/
class MAPNIK_DECL layer
{
public:
layer(std::string const& name,
std::string const& srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs");
layer(layer const& l);
layer& operator=(layer const& rhs);
bool operator==(layer const& other) const;
/*!
* @brief Set the name of the layer.
*/
void set_name(std::string const& name);
/*!
* @return the name of the layer.
*/
std::string const& name() const;
/*!
* @brief Set the SRS of the layer.
*/
void set_srs(std::string const& srs);
/*!
* @return the SRS of the layer.
*/
std::string const& srs() const;
/*!
* @brief Add a new style to this layer.
*
* @param stylename The name of the style to add.
*/
void add_style(std::string const& stylename);
/*!
* @return the styles list attached to this layer.
*/
std::vector<std::string> const& styles() const;
/*!
* @return the styles list attached to this layer
* (non-const version).
*/
std::vector<std::string>& styles();
/*!
* @param max_zoom The minimum zoom level to set
*/
void set_min_zoom(double min_zoom);
/*!
* @param max_zoom The maximum zoom level to set
*/
void set_max_zoom(double max_zoom);
/*!
* @return the minimum zoom level of the layer.
*/
double min_zoom() const;
/*!
* @return the maximum zoom level of the layer.
*/
double max_zoom() const;
/*!
* @brief Set whether this layer is active and will be rendered.
*/
void set_active(bool active);
/*!
* @return whether this layer is active and will be rendered.
*/
bool active() const;
/*!
* @brief Set whether this layer is queryable.
*/
void set_queryable(bool queryable);
/*!
* @return whether this layer is queryable or not.
*/
bool queryable() const;
/*!
* @brief Get the visability for a specific scale.
*
* @param scale Accepts an integer or float input.
*
* @return true if this layer's data is active and visible at a given scale.
* Otherwise returns False.
* @return false if:
* scale >= minzoom - 1e-6
* or
* scale < maxzoom + 1e-6
*/
bool visible(double scale) const;
/*!
* @param clear_cache Set whether this layer's labels are cached.
*/
void set_clear_label_cache(bool clear_cache);
/*!
* @return whether this layer's labels are cached.
*/
bool clear_label_cache() const;
/*!
* @param clear_cache Set whether this layer's features should be cached if used by multiple styles.
*/
void set_cache_features(bool cache_features);
/*!
* @return whether this layer's features will be cached if used by multiple styles
*/
bool cache_features() const;
/*!
* @param group_by Set the field rendering of this layer is grouped by.
*/
void set_group_by(std::string column);
/*!
* @return The field rendering of this layer is grouped by.
*/
std::string const& group_by() const;
/*!
* @brief Attach a datasource for this layer.
*
* @param ds The datasource to attach.
*/
void set_datasource(datasource_ptr const& ds);
/*!
* @return the datasource attached to this layer.
*/
datasource_ptr datasource() const;
/*!
* @return the geographic envelope/bounding box of the data in the layer.
*/
box2d<double> envelope() const;
void set_maximum_extent(box2d<double> const& box);
boost::optional<box2d<double> > const& maximum_extent() const;
void reset_maximum_extent();
void set_buffer_size(int size);
int buffer_size() const;
~layer();
private:
void swap(layer& other);
std::string name_;
std::string srs_;
double min_zoom_;
double max_zoom_;
bool active_;
bool queryable_;
bool clear_label_cache_;
bool cache_features_;
std::string group_by_;
std::vector<std::string> styles_;
datasource_ptr ds_;
int buffer_size_;
boost::optional<box2d<double> > maximum_extent_;
};
}
#endif // MAPNIK_LAYER_HPP
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