543 lines
15 KiB
C++
543 lines
15 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) 2013 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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#ifndef MAPNIK_SYMBOLIZER_HPP
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#define MAPNIK_SYMBOLIZER_HPP
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// mapnik
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#include <mapnik/config.hpp>
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#include <mapnik/value_types.hpp>
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#include <mapnik/image_compositing.hpp>
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#include <mapnik/simplify.hpp>
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#include <mapnik/expression.hpp>
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#include <mapnik/attribute.hpp>
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#include <mapnik/expression_evaluator.hpp>
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#include <mapnik/path_expression.hpp>
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#include <mapnik/parse_path.hpp>
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#include <mapnik/color.hpp>
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#include <mapnik/symbolizer_keys.hpp>
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#include <mapnik/text/placements/base.hpp>
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#include <mapnik/text/placements/dummy.hpp>
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#include <mapnik/raster_colorizer.hpp>
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#include <mapnik/group/group_symbolizer_properties.hpp>
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#include <mapnik/attribute.hpp>
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// stl
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#include <type_traits>
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#include <algorithm>
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#include <memory>
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#include <vector>
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#include <string>
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#include <functional>
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// boost
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#include <boost/variant/variant_fwd.hpp>
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namespace agg { struct trans_affine; }
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namespace mapnik
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{
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// fwd declares
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// TODO - move these transform declares to own header
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namespace detail { struct transform_node; }
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typedef std::vector<detail::transform_node> transform_list;
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typedef std::shared_ptr<transform_list> transform_list_ptr;
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typedef transform_list_ptr transform_type;
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class feature_impl;
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MAPNIK_DECL void evaluate_transform(agg::trans_affine& tr,
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feature_impl const& feature,
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attributes const& vars,
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transform_type const& trans_expr,
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double scale_factor=1.0);
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struct enumeration_wrapper
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{
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int value;
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enumeration_wrapper() = delete;
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template <typename T>
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explicit enumeration_wrapper(T value_)
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: value(value_) {}
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inline operator int() const
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{
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return value;
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}
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};
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typedef std::vector<std::pair<double,double> > dash_array;
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struct MAPNIK_DECL symbolizer_base
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{
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typedef boost::variant<value_bool,
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value_integer,
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enumeration_wrapper,
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value_double,
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std::string,
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color,
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expression_ptr,
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path_expression_ptr,
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transform_type,
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text_placements_ptr,
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dash_array,
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raster_colorizer_ptr,
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group_symbolizer_properties_ptr> value_type;
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typedef mapnik::keys key_type;
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typedef std::map<key_type, value_type> cont_type;
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cont_type properties;
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};
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// symbolizer properties target types
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enum class property_types : std::uint8_t
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{
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target_bool = 1,
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target_double,
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target_integer,
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target_color,
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target_comp_op,
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target_line_cap,
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target_line_join,
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target_line_rasterizer,
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target_halo_rasterizer,
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target_point_placement,
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target_pattern_alignment,
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target_debug_symbolizer_mode,
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target_marker_placement,
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target_marker_multi_policy,
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target_string,
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target_transform,
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target_placement,
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target_dash_array,
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target_colorizer,
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target_repeat_key,
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target_group_symbolizer_properties
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};
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inline bool operator==(symbolizer_base const& lhs, symbolizer_base const& rhs)
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{
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return lhs.properties.size() == rhs.properties.size() &&
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std::equal(lhs.properties.begin(), lhs.properties.end(), rhs.properties.begin());
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}
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template <typename T>
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struct evaluate_path_wrapper
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{
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typedef T result_type;
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template <typename T1, typename T2>
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result_type operator() (T1 const& expr, T2 const& feature) const
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{
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return result_type();
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}
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};
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template <>
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struct evaluate_path_wrapper<std::string>
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{
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template <typename T1, typename T2>
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std::string operator() (T1 const& expr, T2 const& feature) const
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{
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return mapnik::path_processor_type::evaluate(expr, feature);
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}
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};
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namespace detail {
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// enum
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template <typename T, bool is_enum = true>
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struct expression_result
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{
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typedef T result_type;
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static result_type convert(value_type const& val)
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{
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return static_cast<T>(val.convert<value_integer>());
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}
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};
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template <typename T>
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struct expression_result<T,false>
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{
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typedef T result_type;
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static result_type convert(value_type const& val)
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{
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return val.convert<T>();
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}
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};
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// enum
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template <typename T, bool is_enum = true>
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struct enumeration_result
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{
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typedef T result_type;
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static result_type convert(enumeration_wrapper const& e)
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{
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return static_cast<result_type>(e.value);
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}
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};
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template <typename T>
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struct enumeration_result<T,false>
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{
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typedef T result_type;
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static result_type convert(enumeration_wrapper const& e)
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{
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return result_type();// FAIL
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}
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};
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// enum
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template <typename T, bool is_enum = true >
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struct put_impl
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{
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static void apply(symbolizer_base & sym, keys key, T const& val)
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{
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auto itr = sym.properties.find(key);
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if (itr != sym.properties.end())
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{
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sym.properties[key] = enumeration_wrapper(val);
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}
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else
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{
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// NOTE: we use insert here instead of emplace
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// because of lacking std::map emplace support in libstdc++
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// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44436
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sym.properties.insert(std::make_pair(key, enumeration_wrapper(val)));
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}
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}
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};
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template <typename T>
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struct put_impl<T, false>
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{
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static void apply(symbolizer_base & sym, keys key, T const& val)
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{
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auto itr = sym.properties.find(key);
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if (itr != sym.properties.end())
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{
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sym.properties[key] = val;
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}
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else
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{
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sym.properties.insert(std::make_pair(key, val));
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}
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}
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};
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}
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template <typename T>
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struct evaluate_expression_wrapper
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{
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typedef T result_type;
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template <typename T1, typename T2, typename T3>
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result_type operator() (T1 const& expr, T2 const& feature, T3 const& vars) const
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{
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mapnik::value_type result = boost::apply_visitor(mapnik::evaluate<T2,mapnik::value_type,T3>(feature,vars), expr);
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return detail::expression_result<result_type, std::is_enum<result_type>::value>::convert(result);
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}
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};
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// mapnik::color
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template <>
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struct evaluate_expression_wrapper<mapnik::color>
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{
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template <typename T1, typename T2, typename T3>
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mapnik::color operator() (T1 const& expr, T2 const& feature, T3 const& vars) const
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{
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mapnik::value_type val = boost::apply_visitor(mapnik::evaluate<T2,mapnik::value_type,T3>(feature,vars), expr);
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// FIXME - throw instead?
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if (val.is_null()) return mapnik::color(255,192,203); // pink
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return mapnik::color(val.to_string());
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}
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};
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// enumeration wrapper
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template <>
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struct evaluate_expression_wrapper<mapnik::enumeration_wrapper>
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{
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template <typename T1, typename T2, typename T3>
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mapnik::enumeration_wrapper operator() (T1 const& expr, T2 const& feature, T3 const& vars) const
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{
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mapnik::value_type val = boost::apply_visitor(mapnik::evaluate<T2,mapnik::value_type,T3>(feature,vars), expr);
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return mapnik::enumeration_wrapper(val.to_int());
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}
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};
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template <typename T>
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struct extract_value : public boost::static_visitor<T>
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{
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typedef T result_type;
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extract_value(mapnik::feature_impl const& feature,
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mapnik::attributes const& v)
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: feature_(feature),
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vars_(v) {}
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auto operator() (mapnik::expression_ptr const& expr) const -> result_type
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{
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return evaluate_expression_wrapper<result_type>()(*expr,feature_,vars_);
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}
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auto operator() (mapnik::path_expression_ptr const& expr) const -> result_type
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{
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return evaluate_path_wrapper<result_type>()(*expr, feature_);
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}
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auto operator() (result_type const& val) const -> result_type
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{
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return val;
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}
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auto operator() (mapnik::enumeration_wrapper const& e) const -> result_type
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{
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return detail::enumeration_result<result_type, std::is_enum<result_type>::value>::convert(e);
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}
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template <typename TVal>
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auto operator() (TVal const& val) const -> result_type
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{
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return result_type();
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}
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mapnik::feature_impl const& feature_;
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mapnik::attributes const& vars_;
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};
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template <typename T1>
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struct extract_raw_value : public boost::static_visitor<T1>
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{
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typedef T1 result_type;
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auto operator() (result_type const& val) const -> result_type const&
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{
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return val;
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}
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auto operator() (mapnik::enumeration_wrapper const& e) const -> result_type
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{
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return detail::enumeration_result<result_type, std::is_enum<result_type>::value>::convert(e);
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}
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template <typename T2>
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auto operator() (T2 const& val) const -> result_type
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{
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return result_type();
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}
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};
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template <typename T>
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void put(symbolizer_base & sym, keys key, T const& val)
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{
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constexpr bool enum_ = std::is_enum<T>::value;
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detail::put_impl<T, enum_ >::apply(sym, key, val);
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}
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template <typename T>
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bool has_key(symbolizer_base const& sym, keys key)
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{
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return (sym.properties.count(key) == 1);
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}
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template <typename T>
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T get(symbolizer_base const& sym, keys key, mapnik::feature_impl const& feature, attributes const& vars, T const& _default_value = T())
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{
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typedef symbolizer_base::cont_type::const_iterator const_iterator;
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const_iterator itr = sym.properties.find(key);
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if (itr != sym.properties.end())
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{
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return boost::apply_visitor(extract_value<T>(feature,vars), itr->second);
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}
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return _default_value;
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}
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template <typename T>
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boost::optional<T> get_optional(symbolizer_base const& sym, keys key, mapnik::feature_impl const& feature, attributes const& vars)
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{
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typedef symbolizer_base::cont_type::const_iterator const_iterator;
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const_iterator itr = sym.properties.find(key);
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if (itr != sym.properties.end())
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{
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return boost::apply_visitor(extract_value<T>(feature,vars), itr->second);
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}
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return boost::optional<T>();
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}
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template <typename T>
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T get(symbolizer_base const& sym, keys key, T const& _default_value = T())
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{
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typedef symbolizer_base::cont_type::const_iterator const_iterator;
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const_iterator itr = sym.properties.find(key);
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if (itr != sym.properties.end())
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{
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return boost::apply_visitor(extract_raw_value<T>(), itr->second);
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}
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return _default_value;
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}
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template <typename T>
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boost::optional<T> get_optional(symbolizer_base const& sym, keys key)
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{
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typedef symbolizer_base::cont_type::const_iterator const_iterator;
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const_iterator itr = sym.properties.find(key);
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if (itr != sym.properties.end())
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{
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return boost::apply_visitor(extract_raw_value<T>(), itr->second);
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}
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return boost::optional<T>();
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}
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template<typename Enum>
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constexpr auto to_integral(Enum e) -> typename std::underlying_type<Enum>::type
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{
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return static_cast<typename std::underlying_type<Enum>::type>(e);
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}
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typedef std::tuple<const char*, mapnik::symbolizer_base::value_type, std::function<std::string(enumeration_wrapper)>, property_types> property_meta_type;
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property_meta_type const& get_meta(mapnik::keys key);
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mapnik::keys get_key(std::string const& name);
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// concrete symbolizer types
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struct MAPNIK_DECL point_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL line_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL polygon_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL text_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL shield_symbolizer : public text_symbolizer {};
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struct MAPNIK_DECL line_pattern_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL polygon_pattern_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL markers_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL raster_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL building_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL group_symbolizer : public symbolizer_base {};
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struct MAPNIK_DECL debug_symbolizer : public symbolizer_base {};
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// symbolizer
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typedef boost::variant<point_symbolizer,
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line_symbolizer,
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line_pattern_symbolizer,
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polygon_symbolizer,
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polygon_pattern_symbolizer,
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raster_symbolizer,
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shield_symbolizer,
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text_symbolizer,
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building_symbolizer,
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markers_symbolizer,
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group_symbolizer,
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debug_symbolizer> symbolizer;
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typedef std::vector<std::pair<double,double> > dash_array;
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enum line_cap_enum
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{
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BUTT_CAP,
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SQUARE_CAP,
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ROUND_CAP,
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line_cap_enum_MAX
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};
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DEFINE_ENUM( line_cap_e, line_cap_enum );
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enum line_join_enum
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{
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MITER_JOIN,
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MITER_REVERT_JOIN,
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ROUND_JOIN,
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BEVEL_JOIN,
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line_join_enum_MAX
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};
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DEFINE_ENUM( line_join_e, line_join_enum );
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enum line_rasterizer_enum
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{
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RASTERIZER_FULL, // agg::renderer_scanline_aa_solid
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RASTERIZER_FAST, // agg::rasterizer_outline_aa, twice as fast but only good for thin lines
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line_rasterizer_enum_MAX
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};
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DEFINE_ENUM( line_rasterizer_e, line_rasterizer_enum );
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enum halo_rasterizer_enum
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{
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HALO_RASTERIZER_FULL,
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HALO_RASTERIZER_FAST,
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halo_rasterizer_enum_MAX
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};
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DEFINE_ENUM(halo_rasterizer_e, halo_rasterizer_enum);
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enum point_placement_enum
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{
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CENTROID_POINT_PLACEMENT,
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INTERIOR_POINT_PLACEMENT,
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point_placement_enum_MAX
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};
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DEFINE_ENUM( point_placement_e, point_placement_enum );
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enum pattern_alignment_enum
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{
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LOCAL_ALIGNMENT,
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GLOBAL_ALIGNMENT,
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pattern_alignment_enum_MAX
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};
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DEFINE_ENUM( pattern_alignment_e, pattern_alignment_enum );
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enum debug_symbolizer_mode_enum
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{
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DEBUG_SYM_MODE_COLLISION,
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DEBUG_SYM_MODE_VERTEX,
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debug_symbolizer_mode_enum_MAX
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};
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DEFINE_ENUM( debug_symbolizer_mode_e, debug_symbolizer_mode_enum );
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// markers
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// TODO - consider merging with text_symbolizer label_placement_e
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enum marker_placement_enum
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{
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MARKER_POINT_PLACEMENT,
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MARKER_INTERIOR_PLACEMENT,
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MARKER_LINE_PLACEMENT,
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marker_placement_enum_MAX
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};
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DEFINE_ENUM( marker_placement_e, marker_placement_enum );
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enum marker_multi_policy_enum
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{
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MARKER_EACH_MULTI, // each component in a multi gets its marker
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MARKER_WHOLE_MULTI, // consider all components of a multi as a whole
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MARKER_LARGEST_MULTI, // only the largest component of a multi gets a marker
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marker_multi_policy_enum_MAX
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};
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DEFINE_ENUM( marker_multi_policy_e, marker_multi_policy_enum );
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}
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#endif // MAPNIK_SYMBOLIZER_HPP
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