mapnik/src/grid/process_shield_symbolizer.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2014 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

#if defined(GRID_RENDERER)

// mapnik
#include <mapnik/feature.hpp>
#include <mapnik/grid/grid_rasterizer.hpp>
#include <mapnik/grid/grid_renderer.hpp>
#include <mapnik/grid/grid_renderer_base.hpp>
#include <mapnik/grid/grid.hpp>
#include <mapnik/text/symbolizer_helpers.hpp>
#include <mapnik/pixel_position.hpp>
#include <mapnik/text/renderer.hpp>

// agg
#include "agg_trans_affine.h"

namespace mapnik {

template <typename T>
void  grid_renderer<T>::process(shield_symbolizer const& sym,
                                mapnik::feature_impl & feature,
                                proj_transform const& prj_trans)
{
    agg::trans_affine tr;
    auto transform = get_optional<transform_type>(sym, keys::geometry_transform);
    if (transform) evaluate_transform(tr, feature, common_.vars_, *transform, common_.scale_factor_);

    text_symbolizer_helper helper(
            sym, feature, common_.vars_, prj_trans,
            common_.width_, common_.height_,
            common_.scale_factor_,
            common_.t_, common_.font_manager_, *common_.detector_,
            common_.query_extent_, tr);
    bool placement_found = false;

    composite_mode_e comp_op = get<composite_mode_e>(sym, keys::comp_op, feature, common_.vars_, src_over);
    double opacity = get<double>(sym, keys::opacity, feature, common_.vars_, 1.0);

    grid_text_renderer<T> ren(pixmap_,
                              comp_op,
                              common_.scale_factor_);

    placements_list const& placements = helper.get();
    value_integer feature_id = feature.id();

    for (glyph_positions_ptr glyphs : placements)
    {
        if (glyphs->marker())
        {
            render_marker(feature,
                          glyphs->marker_pos(),
                          *(glyphs->marker()->marker),
                          glyphs->marker()->transform,
                          opacity, comp_op);
        }
        ren.render(*glyphs, feature_id);
        placement_found = true;
    }
    if (placement_found)
    {
        pixmap_.add_feature(feature);
    }
}

template void grid_renderer<grid>::process(shield_symbolizer const&,
                                           mapnik::feature_impl &,
                                           proj_transform const&);

}

#endif