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mapnik/demo/c++/rundemo.cpp
Germán Larraín 503d4eaea1 fix shapefiles encoding in demo for C++ 
Mapnik builds without `boost_regex_icu` (see #3440) and the C++ demo does not run:

```
/mapnik# demo/c++/rundemo `mapnik-config --prefix`                                                                                                                                         
 running demo ... 
### std::exception: could not create converter for latin1
```
2016-05-31 12:40:27 -03:00

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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 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/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";
try {
std::cout << " running demo ... \n";
datasource_cache::instance().register_datasources("plugins/input/");
freetype_engine::register_font("fonts/dejavu-fonts-ttf-2.35/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,ROUND_CAP);
put(line_sym,keys::stroke_linejoin,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,ROUND_CAP);
put(line_sym,keys::stroke_linejoin,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,ROUND_CAP);
put(line_sym,keys::stroke_linejoin,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,ROUND_CAP);
put(line_sym,keys::stroke_linejoin,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,ROUND_CAP);
put(line_sym,keys::stroke_linejoin,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;
}
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