444 lines
14 KiB
C++
444 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) 2017 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_VERTEX_CONVERTERS_HPP
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#define MAPNIK_VERTEX_CONVERTERS_HPP
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// mapnik
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#include <mapnik/config.hpp>
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#include <mapnik/attribute.hpp>
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#include <mapnik/view_transform.hpp>
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#include <mapnik/transform_path_adapter.hpp>
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#include <mapnik/offset_converter.hpp>
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#include <mapnik/simplify.hpp>
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#include <mapnik/simplify_converter.hpp>
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#include <mapnik/util/noncopyable.hpp>
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#include <mapnik/value/types.hpp>
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#include <mapnik/symbolizer_enumerations.hpp>
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#include <mapnik/symbolizer_keys.hpp>
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#include <mapnik/symbolizer.hpp>
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#include <mapnik/extend_converter.hpp>
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore_agg.hpp>
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#include "agg_math_stroke.h"
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#include "agg_trans_affine.h"
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#include "agg_conv_clip_polygon.h"
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#include "agg_conv_clip_polyline.h"
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#include "agg_conv_smooth_poly1.h"
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#include "agg_conv_stroke.h"
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#include "agg_conv_dash.h"
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#include "agg_conv_transform.h"
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#pragma GCC diagnostic pop
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// stl
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#include <type_traits>
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#include <stdexcept>
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#include <array>
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namespace mapnik {
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struct transform_tag {};
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struct clip_line_tag {};
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struct clip_poly_tag {};
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struct smooth_tag {};
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struct simplify_tag {};
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struct stroke_tag {};
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struct dash_tag {};
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struct affine_transform_tag {};
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struct offset_transform_tag {};
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struct extend_tag {};
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namespace detail {
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template <typename T0, typename T1>
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struct converter_traits {};
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template <typename T>
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struct converter_traits<T, mapnik::smooth_tag>
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{
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using geometry_type = T;
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using conv_type = typename agg::conv_smooth_poly1_curve<geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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geom.smooth_value(get<value_double, keys::smooth>(args.sym, args.feature, args.vars));
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}
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};
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template <typename T>
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struct converter_traits<T,mapnik::simplify_tag>
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{
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using geometry_type = T;
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using conv_type = simplify_converter<geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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geom.set_simplify_algorithm(get<simplify_algorithm_e,keys::simplify_algorithm>(args.sym, args.feature, args.vars));
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geom.set_simplify_tolerance(get<value_double,keys::simplify_tolerance>(args.sym,args.feature, args.vars));
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}
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};
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template <typename T>
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struct converter_traits<T, mapnik::clip_line_tag>
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{
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using geometry_type = T;
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using conv_type = typename agg::conv_clip_polyline<geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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auto const& box = args.bbox;
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geom.clip_box(box.minx(),box.miny(),box.maxx(),box.maxy());
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}
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};
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template <typename T>
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struct converter_traits<T, mapnik::dash_tag>
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{
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using geometry_type = T;
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using conv_type = typename agg::conv_dash<geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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auto const& sym = args.sym;
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auto const& feat = args.feature;
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auto const& vars = args.vars;
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double scale_factor = args.scale_factor;
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auto dash = get_optional<dash_array>(sym, keys::stroke_dasharray, feat, vars);
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if (dash)
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{
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for (auto const& d : *dash)
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{
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geom.add_dash(d.first * scale_factor,
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d.second * scale_factor);
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}
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}
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}
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};
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template <typename Symbolizer, typename PathType, typename Feature>
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void set_join_caps(Symbolizer const& sym, PathType & stroke, Feature const& feature, attributes const& vars)
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{
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line_join_enum join = get<line_join_enum,keys::stroke_linejoin>(sym, feature, vars);
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switch (join)
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{
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case MITER_JOIN:
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stroke.generator().line_join(agg::miter_join);
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break;
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case MITER_REVERT_JOIN:
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stroke.generator().line_join(agg::miter_join);
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break;
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case ROUND_JOIN:
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stroke.generator().line_join(agg::round_join);
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break;
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default:
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stroke.generator().line_join(agg::bevel_join);
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}
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line_cap_enum cap = get<line_cap_enum,keys::stroke_linecap>(sym, feature, vars);
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switch (cap)
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{
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case BUTT_CAP:
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stroke.generator().line_cap(agg::butt_cap);
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break;
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case SQUARE_CAP:
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stroke.generator().line_cap(agg::square_cap);
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break;
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default:
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stroke.generator().line_cap(agg::round_cap);
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}
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}
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template <typename T>
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struct converter_traits<T, mapnik::stroke_tag>
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{
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using geometry_type = T;
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using conv_type = typename agg::conv_stroke<geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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auto const& sym = args.sym;
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auto const& feat = args.feature;
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auto const& vars = args.vars;
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set_join_caps(sym, geom, feat, vars);
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double miterlimit = get<value_double,keys::stroke_miterlimit>(sym, feat, vars);
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geom.generator().miter_limit(miterlimit);
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double scale_factor = args.scale_factor;
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double width = get<value_double,keys::stroke_width>(sym, feat, vars);
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geom.generator().width(width * scale_factor);
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}
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};
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template <typename T>
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struct converter_traits<T,mapnik::clip_poly_tag>
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{
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using geometry_type = T;
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using conv_type = typename agg::conv_clip_polygon<geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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auto const& box = args.bbox;
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geom.clip_box(box.minx(),box.miny(),box.maxx(),box.maxy());
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}
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};
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template <typename T>
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struct converter_traits<T,mapnik::transform_tag>
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{
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using geometry_type = T;
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using conv_type = transform_path_adapter<view_transform, geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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geom.set_proj_trans(args.prj_trans);
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geom.set_trans(args.tr);
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}
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};
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template <typename T>
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struct converter_traits<T,mapnik::affine_transform_tag>
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{
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using geometry_type = T;
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using conv_base_type = agg::conv_transform<geometry_type, agg::trans_affine const>;
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struct conv_type : public conv_base_type
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{
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conv_type(geometry_type& geom)
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: conv_base_type(geom, agg::trans_affine::identity) {}
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};
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template <typename Args>
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static void setup(geometry_type & geom, Args & args)
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{
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geom.transformer(args.affine_trans);
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}
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};
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template <typename T>
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struct converter_traits<T,mapnik::offset_transform_tag>
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{
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using geometry_type = T;
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using conv_type = offset_converter<geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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auto const& sym = args.sym;
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auto const& feat = args.feature;
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auto const& vars = args.vars;
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double offset = get<value_double, keys::offset>(sym, feat, vars);
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geom.set_offset(offset * args.scale_factor);
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}
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};
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template <typename T>
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struct converter_traits<T, mapnik::extend_tag>
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{
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using geometry_type = T;
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using conv_type = extend_converter<geometry_type>;
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template <typename Args>
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static void setup(geometry_type & geom, Args const& args)
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{
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auto const& sym = args.sym;
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auto const& feat = args.feature;
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auto const& vars = args.vars;
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double extend = get<value_double, keys::extend>(sym, feat, vars);
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geom.set_extend(extend * args.scale_factor);
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}
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};
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template <typename T0, typename T1>
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struct is_switchable
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{
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static constexpr bool value = true;
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};
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template <typename T>
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struct is_switchable<T, transform_tag>
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{
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static constexpr bool value = false;
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};
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template <typename T>
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struct is_switchable<T, stroke_tag>
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{
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static constexpr bool value = false;
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};
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template <typename Dispatcher, typename... ConverterTypes>
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struct converters_helper;
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template <typename Dispatcher, typename Current, typename... ConverterTypes>
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struct converters_helper<Dispatcher, Current, ConverterTypes...>
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{
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template <typename Converter>
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static void set(Dispatcher & disp, std::size_t state)
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{
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if (std::is_same<Converter,Current>::value)
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{
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constexpr std::size_t index = sizeof...(ConverterTypes) ;
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disp.vec_[index] = state;
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}
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else
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{
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converters_helper<Dispatcher,ConverterTypes...>:: template set<Converter>(disp, state);
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}
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}
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template <typename Geometry, typename Processor>
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static void forward(Dispatcher & disp, Geometry & geom, Processor & proc,
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typename std::enable_if<detail::is_switchable<Geometry,Current>::value>::type* = 0)
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{
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constexpr std::size_t index = sizeof...(ConverterTypes);
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if (disp.vec_[index] == 1)
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{
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using conv_type = typename detail::converter_traits<Geometry,Current>::conv_type;
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conv_type conv(geom);
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detail::converter_traits<conv_type,Current>::setup(conv,disp.args_);
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converters_helper<Dispatcher, ConverterTypes...>::forward(disp, conv, proc);
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}
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else
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{
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converters_helper<Dispatcher,ConverterTypes...>::forward(disp, geom, proc);
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}
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}
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template <typename Geometry, typename Processor>
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static void forward(Dispatcher & disp, Geometry & geom, Processor & proc,
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typename std::enable_if<!detail::is_switchable<Geometry,Current>::value>::type* = 0)
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{
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using conv_type = typename detail::converter_traits<Geometry,Current>::conv_type;
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conv_type conv(geom);
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detail::converter_traits<conv_type,Current>::setup(conv,disp.args_);
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converters_helper<Dispatcher, ConverterTypes...>::forward(disp, conv, proc);
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}
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};
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template <typename Dispatcher>
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struct converters_helper<Dispatcher>
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{
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template <typename Converter>
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static void set(Dispatcher &, std::size_t) {}
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template <typename Geometry, typename Processor>
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static void forward(Dispatcher &, Geometry & geom, Processor & proc)
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{
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proc.add_path(geom);
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}
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};
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template <typename Args, std::size_t NUM_CONV>
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struct dispatcher : util::noncopyable
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{
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using this_type = dispatcher;
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using args_type = Args;
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dispatcher(box2d<double> const& bbox, symbolizer_base const& sym, view_transform const& tr,
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proj_transform const& prj_trans, agg::trans_affine const& affine_trans, feature_impl const& feature,
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attributes const& vars, double scale_factor)
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: args_(bbox,sym,tr,prj_trans,affine_trans,feature,vars,scale_factor)
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{
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std::fill(vec_.begin(), vec_.end(), 0);
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}
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std::array<std::size_t, NUM_CONV> vec_;
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args_type args_;
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};
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struct arguments : util::noncopyable
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{
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arguments(box2d<double> const& _bbox, symbolizer_base const& _sym, view_transform const& _tr,
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proj_transform const& _prj_trans, agg::trans_affine const& _affine_trans, feature_impl const& _feature,
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attributes const& _vars, double _scale_factor)
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: bbox(_bbox),
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sym(_sym),
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tr(_tr),
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prj_trans(_prj_trans),
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affine_trans(_affine_trans),
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feature(_feature),
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vars(_vars),
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scale_factor(_scale_factor) {}
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box2d<double> const& bbox;
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symbolizer_base const& sym;
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view_transform const& tr;
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proj_transform const& prj_trans;
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agg::trans_affine const& affine_trans;
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feature_impl const& feature;
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attributes const& vars;
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double scale_factor;
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};
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}
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template <typename... ConverterTypes >
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struct vertex_converter : private util::noncopyable
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{
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using bbox_type = box2d<double>;
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using symbolizer_type = symbolizer_base;
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using trans_type = view_transform;
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using proj_trans_type = proj_transform;
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using affine_trans_type = agg::trans_affine;
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using feature_type = feature_impl;
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using args_type = detail::arguments;
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using dispatcher_type = detail::dispatcher<args_type, sizeof...(ConverterTypes)>;
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vertex_converter(bbox_type const& bbox,
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symbolizer_type const& sym,
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trans_type const& tr,
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proj_trans_type const& prj_trans,
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affine_trans_type const& affine_trans,
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feature_type const& feature,
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attributes const& vars,
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double scale_factor)
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: disp_(bbox,sym,tr,prj_trans,affine_trans,feature,vars,scale_factor) {}
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template <typename VertexAdapter, typename Processor>
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void apply(VertexAdapter & geom, Processor & proc)
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{
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detail::converters_helper<dispatcher_type, ConverterTypes...>:: template forward<VertexAdapter, Processor>(disp_, geom, proc);
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}
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template <typename Converter>
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void set()
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{
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detail::converters_helper<dispatcher_type, ConverterTypes...>:: template set<Converter>(disp_, 1);
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}
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template <typename Converter>
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void unset()
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{
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detail::converters_helper<dispatcher_type, ConverterTypes...>:: template set<Converter>(disp_, 0);
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}
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dispatcher_type disp_;
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};
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}
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#endif // MAPNIK_VERTEX_CONVERTERS_HPP
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