497 lines
14 KiB
C++
497 lines
14 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) 2015 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/image_scaling.hpp>
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#include <mapnik/image_compositing.hpp>
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#include <mapnik/simplify.hpp>
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#include <mapnik/enumeration.hpp>
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#include <mapnik/expression.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/attribute.hpp>
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#include <mapnik/symbolizer_base.hpp>
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#include <mapnik/symbolizer_enumerations.hpp>
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#include <mapnik/text/font_feature_settings.hpp>
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#include <mapnik/util/dasharray_parser.hpp>
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#include <mapnik/util/variant.hpp>
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#include <mapnik/symbolizer_default_values.hpp>
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// stl
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#include <type_traits>
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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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#include <map>
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#include <tuple>
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// boost
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#include <boost/optional.hpp>
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namespace mapnik
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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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target_halo_comp_op,
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target_simplify_algorithm,
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target_markers_placement,
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target_markers_multipolicy,
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target_gamma_method,
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target_text_transform,
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target_horizontal_alignment,
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target_justify_alignment,
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target_vertical_alignment,
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target_upright,
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target_direction,
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target_font_feature_settings
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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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using result_type = T;
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template <typename T1, typename T2>
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result_type operator() (T1 const&, T2 const&) 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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template <typename T>
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struct enum_traits {};
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template <>
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struct enum_traits<composite_mode_e>
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{
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using result_type = boost::optional<composite_mode_e>;
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static result_type from_string(std::string const& str)
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{
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return comp_op_from_string(str);
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}
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};
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template <>
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struct enum_traits<scaling_method_e>
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{
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using result_type = boost::optional<scaling_method_e>;
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static result_type from_string(std::string const& str)
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{
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return scaling_method_from_string(str);
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}
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};
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template <>
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struct enum_traits<simplify_algorithm_e>
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{
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using result_type = boost::optional<simplify_algorithm_e>;
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static result_type from_string(std::string const& str)
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{
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return simplify_algorithm_from_string(str);
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}
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};
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#define ENUM_FROM_STRING( e ) \
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template <> struct enum_traits<e> { \
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using result_type = boost::optional<e>; \
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static result_type from_string(std::string const& str) \
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{ \
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enumeration<e, e ## _MAX> enum_; \
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try \
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{ \
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enum_.from_string(str); \
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return result_type(e(enum_)); \
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} \
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catch (...) \
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{ \
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return result_type(); \
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} \
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} \
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};\
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ENUM_FROM_STRING( line_cap_enum )
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ENUM_FROM_STRING( line_join_enum )
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ENUM_FROM_STRING( point_placement_enum )
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ENUM_FROM_STRING( line_rasterizer_enum )
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ENUM_FROM_STRING( marker_placement_enum )
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ENUM_FROM_STRING( marker_multi_policy_enum )
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ENUM_FROM_STRING( debug_symbolizer_mode_enum )
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ENUM_FROM_STRING( pattern_alignment_enum )
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ENUM_FROM_STRING( halo_rasterizer_enum )
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ENUM_FROM_STRING( label_placement_enum )
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ENUM_FROM_STRING( vertical_alignment_enum )
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ENUM_FROM_STRING( horizontal_alignment_enum )
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ENUM_FROM_STRING( justify_alignment_enum )
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ENUM_FROM_STRING( text_transform_enum )
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ENUM_FROM_STRING( text_upright_enum )
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ENUM_FROM_STRING( direction_enum )
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ENUM_FROM_STRING( gamma_method_enum )
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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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using result_type = T;
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static result_type convert(value_type const& val)
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{
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auto result = enum_traits<T>::from_string(val.to_string());
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if (result) return static_cast<result_type>(*result);
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return result_type(0);
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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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using result_type = T;
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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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using result_type = T;
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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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using result_type = T;
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static result_type convert(enumeration_wrapper const&)
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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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sym.properties.emplace(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.emplace(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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using result_type = T;
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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 = util::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 = util::apply_visitor(mapnik::evaluate<T2,mapnik::value_type,T3>(feature,vars), expr);
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if (val.is_null()) return mapnik::color(0,0,0,0); // transparent
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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 = util::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 <>
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struct evaluate_expression_wrapper<mapnik::dash_array>
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{
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template <typename T1, typename T2, typename T3>
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mapnik::dash_array operator() (T1 const& expr, T2 const& feature, T3 const& vars) const
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{
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mapnik::value_type val = util::apply_visitor(mapnik::evaluate<T2,mapnik::value_type,T3>(feature,vars), expr);
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if (val.is_null()) return dash_array();
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dash_array dash;
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std::vector<double> buf;
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std::string str = val.to_string();
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if (util::parse_dasharray(str,buf))
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{
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util::add_dashes(buf,dash);
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}
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return dash;
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}
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};
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// mapnik::font_feature_settings
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template <>
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struct evaluate_expression_wrapper<mapnik::font_feature_settings>
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{
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template <typename T1, typename T2, typename T3>
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mapnik::font_feature_settings operator() (T1 const& expr, T2 const& feature, T3 const& vars) const
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{
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mapnik::value_type val = util::apply_visitor(mapnik::evaluate<T2, mapnik::value_type, T3>(feature, vars), expr);
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if (val.is_null()) return mapnik::font_feature_settings();
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return mapnik::font_feature_settings(val.to_string());
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}
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};
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template <typename T>
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struct extract_value
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{
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using result_type = T;
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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 T1>
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auto operator() (T1 const&) 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
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{
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using result_type = T1;
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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&) 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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using property_meta_type = std::tuple<const char*, std::function<std::string(enumeration_wrapper)>, property_types>;
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MAPNIK_DECL property_meta_type const& get_meta(mapnik::keys key);
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MAPNIK_DECL mapnik::keys get_key(std::string const& name);
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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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inline 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, keys key>
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T get(symbolizer_base const& sym, mapnik::feature_impl const& feature, attributes const& vars)
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{
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using const_iterator = symbolizer_base::cont_type::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 util::apply_visitor(extract_value<T>(feature,vars), itr->second);
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}
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return mapnik::symbolizer_default<T,key>::value();
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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)
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{
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using const_iterator = symbolizer_base::cont_type::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 util::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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using const_iterator = symbolizer_base::cont_type::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 util::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)
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{
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using const_iterator = symbolizer_base::cont_type::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 util::apply_visitor(extract_raw_value<T>(), itr->second);
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}
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return 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)
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{
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using const_iterator = symbolizer_base::cont_type::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 util::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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using const_iterator = symbolizer_base::cont_type::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 util::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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}
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#endif // MAPNIK_SYMBOLIZER_HPP
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