137 lines
5.5 KiB
C++
137 lines
5.5 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) 2014 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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#if defined(HAVE_CAIRO)
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// mapnik
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#include <mapnik/make_unique.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/proj_transform.hpp>
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#include <mapnik/cairo/cairo_renderer.hpp>
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#include <mapnik/renderer_common/render_pattern.hpp>
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#include <mapnik/vertex_converters.hpp>
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#include <mapnik/marker.hpp>
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#include <mapnik/marker_cache.hpp>
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#include <mapnik/agg_rasterizer.hpp>
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namespace mapnik
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{
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template <typename T>
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void cairo_renderer<T>::process(line_pattern_symbolizer const& sym,
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mapnik::feature_impl & feature,
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proj_transform const& prj_trans)
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{
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std::string filename = get<std::string>(sym, keys::file, feature, common_.vars_);
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composite_mode_e comp_op = get<composite_mode_e>(sym, keys::comp_op, feature, common_.vars_, src_over);
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bool clip = get<bool>(sym, keys::clip, feature, common_.vars_, false);
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double offset = get<double>(sym, keys::offset, feature, common_.vars_, 0.0);
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double simplify_tolerance = get<double>(sym, keys::simplify_tolerance, feature, common_.vars_, 0.0);
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double smooth = get<double>(sym, keys::smooth, feature, common_.vars_, 0.0);
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boost::optional<marker_ptr> marker;
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if ( !filename.empty() )
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{
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marker = marker_cache::instance().find(filename, true);
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}
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if (!marker || !(*marker)) return;
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unsigned width = (*marker)->width();
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unsigned height = (*marker)->height();
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cairo_save_restore guard(context_);
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context_.set_operator(comp_op);
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std::shared_ptr<cairo_pattern> pattern;
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image_ptr image = nullptr;
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// TODO - re-implement at renderer level like polygon_pattern symbolizer
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double opacity = get<value_double>(sym, keys::opacity, feature, common_.vars_,1.0);
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if ((*marker)->is_bitmap())
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{
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pattern = std::make_unique<cairo_pattern>(**((*marker)->get_bitmap_data()), opacity);
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context_.set_line_width(height);
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}
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else
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{
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mapnik::rasterizer ras;
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agg::trans_affine image_tr = agg::trans_affine_scaling(common_.scale_factor_);
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auto image_transform = get_optional<transform_type>(sym, keys::image_transform);
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if (image_transform) evaluate_transform(image_tr, feature, common_.vars_, *image_transform);
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image = render_pattern(ras, **marker, image_tr, 1.0);
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pattern = std::make_unique<cairo_pattern>(*image, opacity);
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width = image->width();
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height = image->height();
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context_.set_line_width(height);
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}
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pattern->set_extend(CAIRO_EXTEND_REPEAT);
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pattern->set_filter(CAIRO_FILTER_BILINEAR);
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agg::trans_affine tr;
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auto geom_transform = get_optional<transform_type>(sym, keys::geometry_transform);
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if (geom_transform) { evaluate_transform(tr, feature, common_.vars_, *geom_transform, common_.scale_factor_); }
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box2d<double> clipping_extent = common_.query_extent_;
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if (clip)
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{
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double padding = (double)(common_.query_extent_.width()/common_.width_);
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double half_stroke = width/2.0;
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if (half_stroke > 1)
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padding *= half_stroke;
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if (std::fabs(offset) > 0)
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padding *= std::fabs(offset) * 1.2;
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padding *= common_.scale_factor_;
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clipping_extent.pad(padding);
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}
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using rasterizer_type = line_pattern_rasterizer<cairo_context>;
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rasterizer_type ras(context_, *pattern, width, height);
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vertex_converter<rasterizer_type,clip_line_tag, transform_tag,
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affine_transform_tag,
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simplify_tag, smooth_tag,
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offset_transform_tag,
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dash_tag, stroke_tag>
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converter(clipping_extent, ras, sym, common_.t_, prj_trans, tr, feature, common_.vars_, common_.scale_factor_);
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if (clip) converter.set<clip_line_tag>(); // optional clip (default: true)
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converter.set<transform_tag>(); // always transform
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if (std::fabs(offset) > 0.0) converter.set<offset_transform_tag>(); // parallel offset
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converter.set<affine_transform_tag>(); // optional affine transform
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if (simplify_tolerance > 0.0) converter.set<simplify_tag>(); // optional simplify converter
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if (smooth > 0.0) converter.set<smooth_tag>(); // optional smooth converter
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for (auto & geom : feature.paths())
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{
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if (geom.size() > 1)
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{
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converter.apply(geom);
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}
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}
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}
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template void cairo_renderer<cairo_ptr>::process(line_pattern_symbolizer const&,
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mapnik::feature_impl &,
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proj_transform const&);
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}
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#endif // HAVE_CAIRO
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