mapnik/demo/c++/rundemo.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2024 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
 *
 *****************************************************************************/

#include <mapnik/mapnik.hpp>
#include <mapnik/map.hpp>
#include <mapnik/layer.hpp>
#include <mapnik/rule.hpp>
#include <mapnik/feature_type_style.hpp>
#include <mapnik/symbolizer.hpp>
#include <mapnik/text/placements/dummy.hpp>
#include <mapnik/text/text_properties.hpp>
#include <mapnik/text/formatting/text.hpp>
#include <mapnik/datasource_cache.hpp>
#include <mapnik/font_engine_freetype.hpp>
#include <mapnik/agg_renderer.hpp>
#include <mapnik/expression.hpp>
#include <mapnik/color_factory.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/unicode.hpp>
#include <mapnik/save_map.hpp>
#include <mapnik/cairo_io.hpp>

#if defined(HAVE_CAIRO)
#include <mapnik/cairo/cairo_renderer.hpp>
#include <mapnik/cairo/cairo_image_util.hpp>
#endif

#include <iostream>

int main(int, char**)
{
    using namespace mapnik;
    const std::string srs_lcc =
      "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs";
    const std::string srs_merc = "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 "
                                 "+units=m +nadgrids=@null +wktext +no_defs +over";
    mapnik::setup();
    try
    {
        std::cout << " running demo ... \n";
        datasource_cache::instance().register_datasources("plugins/input/");
        freetype_engine::register_font("fonts/dejavu-fonts-ttf-2.37/ttf/DejaVuSans.ttf");

        Map m(800, 600);
        m.set_background(parse_color("white"));
        m.set_srs(srs_merc);
        // create styles

        // Provinces (polygon)
        feature_type_style provpoly_style;
        provpoly_style.reserve(2); // prevent reallocation and copying in add_rule
        {
            rule r;
            r.set_filter(parse_expression("[NAME_EN] = 'Ontario'"));
            {
                polygon_symbolizer poly_sym;
                put(poly_sym, keys::fill, color(250, 190, 183));
                r.append(std::move(poly_sym));
            }
            provpoly_style.add_rule(std::move(r));
        }
        {
            rule r;
            r.set_filter(parse_expression("[NOM_FR] = 'Québec'"));
            {
                polygon_symbolizer poly_sym;
                put(poly_sym, keys::fill, color(217, 235, 203));
                r.append(std::move(poly_sym));
            }
            provpoly_style.add_rule(std::move(r));
        }
        m.insert_style("provinces", std::move(provpoly_style));

        // Provinces (polyline)
        feature_type_style provlines_style;
        {
            rule r;
            {
                line_symbolizer line_sym;
                put(line_sym, keys::stroke, color(0, 0, 0));
                put(line_sym, keys::stroke_width, 1.0);
                dash_array dash;
                dash.emplace_back(8, 4);
                dash.emplace_back(2, 2);
                dash.emplace_back(2, 2);
                put(line_sym, keys::stroke_dasharray, dash);
                r.append(std::move(line_sym));
            }
            provlines_style.add_rule(std::move(r));
        }
        m.insert_style("provlines", std::move(provlines_style));

        // Drainage
        feature_type_style qcdrain_style;
        {
            rule r;
            r.set_filter(parse_expression("[HYC] = 8"));
            {
                polygon_symbolizer poly_sym;
                put(poly_sym, keys::fill, color(153, 204, 255));
                r.append(std::move(poly_sym));
            }
            qcdrain_style.add_rule(std::move(r));
        }
        m.insert_style("drainage", std::move(qcdrain_style));

        // Roads 3 and 4 (The "grey" roads)
        feature_type_style roads34_style;
        {
            rule r;
            r.set_filter(parse_expression("[CLASS] = 3 or [CLASS] = 4"));
            {
                line_symbolizer line_sym;
                put(line_sym, keys::stroke, color(171, 158, 137));
                put(line_sym, keys::stroke_width, 2.0);
                put(line_sym, keys::stroke_linecap, line_cap_enum::ROUND_CAP);
                put(line_sym, keys::stroke_linejoin, line_join_enum::ROUND_JOIN);
                r.append(std::move(line_sym));
            }
            roads34_style.add_rule(std::move(r));
        }
        m.insert_style("smallroads", std::move(roads34_style));

        // Roads 2 (The thin yellow ones)
        feature_type_style roads2_style_1;
        {
            rule r;
            r.set_filter(parse_expression("[CLASS] = 2"));
            {
                line_symbolizer line_sym;
                put(line_sym, keys::stroke, color(171, 158, 137));
                put(line_sym, keys::stroke_width, 4.0);
                put(line_sym, keys::stroke_linecap, line_cap_enum::ROUND_CAP);
                put(line_sym, keys::stroke_linejoin, line_join_enum::ROUND_JOIN);
                r.append(std::move(line_sym));
            }
            roads2_style_1.add_rule(std::move(r));
        }
        m.insert_style("road-border", std::move(roads2_style_1));

        feature_type_style roads2_style_2;
        {
            rule r;
            r.set_filter(parse_expression("[CLASS] = 2"));
            {
                line_symbolizer line_sym;
                put(line_sym, keys::stroke, color(255, 250, 115));
                put(line_sym, keys::stroke_width, 2.0);
                put(line_sym, keys::stroke_linecap, line_cap_enum::ROUND_CAP);
                put(line_sym, keys::stroke_linejoin, line_join_enum::ROUND_JOIN);
                r.append(std::move(line_sym));
            }
            roads2_style_2.add_rule(std::move(r));
        }
        m.insert_style("road-fill", std::move(roads2_style_2));

        // Roads 1 (The big orange ones, the highways)
        feature_type_style roads1_style_1;
        {
            rule r;
            r.set_filter(parse_expression("[CLASS] = 1"));
            {
                line_symbolizer line_sym;
                put(line_sym, keys::stroke, color(188, 149, 28));
                put(line_sym, keys::stroke_width, 7.0);
                put(line_sym, keys::stroke_linecap, line_cap_enum::ROUND_CAP);
                put(line_sym, keys::stroke_linejoin, line_join_enum::ROUND_JOIN);
                r.append(std::move(line_sym));
            }
            roads1_style_1.add_rule(std::move(r));
        }
        m.insert_style("highway-border", std::move(roads1_style_1));

        feature_type_style roads1_style_2;
        {
            rule r;
            r.set_filter(parse_expression("[CLASS] = 1"));
            {
                line_symbolizer line_sym;
                put(line_sym, keys::stroke, color(242, 191, 36));
                put(line_sym, keys::stroke_width, 5.0);
                put(line_sym, keys::stroke_linecap, line_cap_enum::ROUND_CAP);
                put(line_sym, keys::stroke_linejoin, line_join_enum::ROUND_JOIN);
                r.append(std::move(line_sym));
            }
            roads1_style_2.add_rule(std::move(r));
        }
        m.insert_style("highway-fill", std::move(roads1_style_2));

        // Populated Places
        feature_type_style popplaces_style;
        {
            rule r;
            {
                text_symbolizer text_sym;
                text_placements_ptr placement_finder = std::make_shared<text_placements_dummy>();
                placement_finder->defaults.format_defaults.face_name = "DejaVu Sans Book";
                placement_finder->defaults.format_defaults.text_size = 10.0;
                placement_finder->defaults.format_defaults.fill = color(0, 0, 0);
                placement_finder->defaults.format_defaults.halo_fill = color(255, 255, 200);
                placement_finder->defaults.format_defaults.halo_radius = 1.0;
                placement_finder->defaults.set_format_tree(
                  std::make_shared<mapnik::formatting::text_node>(parse_expression("[GEONAME]")));
                put<text_placements_ptr>(text_sym, keys::text_placements_, placement_finder);
                r.append(std::move(text_sym));
            }
            popplaces_style.add_rule(std::move(r));
        }

        m.insert_style("popplaces", std::move(popplaces_style));

        // layers
        // Provincial  polygons
        {
            parameters p;
            p["type"] = "shape";
            p["file"] = "demo/data/boundaries";
            p["encoding"] = "utf8";

            layer lyr("Provinces");
            lyr.set_datasource(datasource_cache::instance().create(p));
            lyr.add_style("provinces");
            lyr.set_srs(srs_lcc);
            m.add_layer(lyr);
        }

        // Drainage
        {
            parameters p;
            p["type"] = "shape";
            p["file"] = "demo/data/qcdrainage";
            layer lyr("Quebec Hydrography");
            lyr.set_datasource(datasource_cache::instance().create(p));
            lyr.set_srs(srs_lcc);
            lyr.add_style("drainage");
            m.add_layer(lyr);
        }

        {
            parameters p;
            p["type"] = "shape";
            p["file"] = "demo/data/ontdrainage";
            layer lyr("Ontario Hydrography");
            lyr.set_datasource(datasource_cache::instance().create(p));
            lyr.set_srs(srs_lcc);
            lyr.add_style("drainage");
            m.add_layer(lyr);
        }

        // Provincial boundaries
        {
            parameters p;
            p["type"] = "shape";
            p["file"] = "demo/data/boundaries_l";
            layer lyr("Provincial borders");
            lyr.set_srs(srs_lcc);
            lyr.set_datasource(datasource_cache::instance().create(p));
            lyr.add_style("provlines");
            m.add_layer(lyr);
        }

        // Roads
        {
            parameters p;
            p["type"] = "shape";
            p["file"] = "demo/data/roads";
            layer lyr("Roads");
            lyr.set_srs(srs_lcc);
            lyr.set_datasource(datasource_cache::instance().create(p));
            lyr.add_style("smallroads");
            lyr.add_style("road-border");
            lyr.add_style("road-fill");
            lyr.add_style("highway-border");
            lyr.add_style("highway-fill");

            m.add_layer(lyr);
        }
        // popplaces
        {
            parameters p;
            p["type"] = "shape";
            p["file"] = "demo/data/popplaces";
            p["encoding"] = "utf8";
            layer lyr("Populated Places");
            lyr.set_srs(srs_lcc);
            lyr.set_datasource(datasource_cache::instance().create(p));
            lyr.add_style("popplaces");
            m.add_layer(lyr);
        }

        m.zoom_to_box(box2d<double>(-8024477.28459, 5445190.38849, -7381388.20071, 5662941.44855));

        image_rgba8 buf(m.width(), m.height());
        agg_renderer<image_rgba8> ren(m, buf);
        ren.apply();
        std::string msg("These maps have been rendered using AGG in the current directory:\n");
#ifdef HAVE_JPEG
        save_to_file(buf, "demo.jpg", "jpeg");
        msg += "- demo.jpg\n";
#endif
#ifdef HAVE_PNG
        save_to_file(buf, "demo.png", "png");
        save_to_file(buf, "demo256.png", "png8");
        msg += "- demo.png\n";
        msg += "- demo256.png\n";
#endif
#ifdef HAVE_TIFF
        save_to_file(buf, "demo.tif", "tiff");
        msg += "- demo.tif\n";
#endif
#ifdef HAVE_WEBP
        save_to_file(buf, "demo.webp", "webp");
        msg += "- demo.webp\n";
#endif
        msg += "Have a look!\n";
        std::cout << msg;

#if defined(HAVE_CAIRO)
        // save to pdf/svg files
        save_to_cairo_file(m, "cairo-demo.pdf");
        save_to_cairo_file(m, "cairo-demo.svg");

        /* we could also do:

           save_to_cairo_file(m,"cairo-demo.png");

           but instead let's build up a surface for more flexibility
        */

        cairo_surface_ptr image_surface(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, m.width(), m.height()),
                                        cairo_surface_closer());
        double scale_factor = 1.0;
        cairo_ptr image_context(create_context(image_surface));
        mapnik::cairo_renderer<cairo_ptr> png_render(m, image_context, scale_factor);
        png_render.apply();
        // we can now write to png with cairo functionality
        cairo_surface_write_to_png(&*image_surface, "cairo-demo.png");
        // but we can also benefit from quantization by converting
        // to a mapnik image object and then saving that
        mapnik::image_rgba8 im_data(cairo_image_surface_get_width(&*image_surface),
                                    cairo_image_surface_get_height(&*image_surface));
        cairo_image_to_rgba8(im_data, image_surface);
        save_to_file(im_data, "cairo-demo256.png", "png8");
        cairo_surface_finish(&*image_surface);

        std::cout << "Three maps have been rendered using Cairo in the current directory:\n"
                     "- cairo-demo.png\n"
                     "- cairo-demo256.png\n"
                     "- cairo-demo.pdf\n"
                     "- cairo-demo.svg\n"
                     "Have a look!\n";
#endif
        // save map definition (data + style)
        save_map(m, "map.xml");
    }
    catch (std::exception const& ex)
    {
        std::cerr << "### std::exception: " << ex.what() << std::endl;
        return EXIT_FAILURE;
    }
    catch (...)
    {
        std::cerr << "### Unknown exception." << std::endl;
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}