mapnik/demo/c++/rundemo.cpp

#include <mapnik.hpp>
#include <iostream>

using namespace mapnik;

// helper function 
filter_ptr create_filter (std::string const& wkt)
{
    filter_factory<Feature> factory;
    return factory.compile(wkt);
}

int main ( int argc , char** argv)
{    
    std::cout << " running demo ... \n";
    datasource_cache::instance()->register_datasources("/usr/local/lib/mapnik/input"); 
    freetype_engine::instance()->register_font("/usr/share/fonts/bitstream-vera/Vera.ttf");
    
    Map m(800,600);
    m.setBackground(color_factory::from_string("white"));
    
    // create styles

    // Provinces (polygon)
    feature_type_style provpoly_style;
   
    rule_type provpoly_rule_on;
    provpoly_rule_on.set_filter(create_filter("[NAME_EN] = 'Ontario'"));
    provpoly_rule_on.append(polygon_symbolizer(Color(250, 190, 183)));
    provpoly_style.add_rule(provpoly_rule_on);
    
    rule_type provpoly_rule_qc;
    provpoly_rule_qc.set_filter(create_filter("[NAME_EN] = 'Quebec'"));
    provpoly_rule_qc.append(polygon_symbolizer(Color(217, 235, 203)));
    provpoly_style.add_rule(provpoly_rule_qc);
    
    m.insert_style("provinces",provpoly_style);

    // Provinces (polyline)
    feature_type_style provlines_style;
    
    stroke provlines_stk (Color(0,0,0),1.0);
    provlines_stk.add_dash(8, 4);
    provlines_stk.add_dash(2, 2);
    provlines_stk.add_dash(2, 2);
    
    rule_type provlines_rule;
    provlines_rule.append(line_symbolizer(provlines_stk));
    provlines_style.add_rule(provlines_rule);
    
    m.insert_style("provlines",provlines_style);
    
    // Drainage 
    feature_type_style qcdrain_style;
    
    rule_type qcdrain_rule;
    qcdrain_rule.set_filter(create_filter("[HYC] = 8"));
    qcdrain_rule.append(polygon_symbolizer(Color(153, 204, 255)));
    qcdrain_style.add_rule(qcdrain_rule);
    
    m.insert_style("drainage",qcdrain_style);
    
    // Roads 3 and 4 (The "grey" roads)
    feature_type_style roads34_style;    
    rule_type roads34_rule;
    roads34_rule.set_filter(create_filter("[CLASS] = 3 or [CLASS] = 4"));
    stroke roads34_rule_stk(Color(171,158,137),2.0);
    roads34_rule_stk.set_line_cap(ROUND_CAP);
    roads34_rule_stk.set_line_join(ROUND_JOIN);
    roads34_rule.append(line_symbolizer(roads34_rule_stk));
    roads34_style.add_rule(roads34_rule);
    
    m.insert_style("smallroads",roads34_style);
    

    // Roads 2 (The thin yellow ones)
    feature_type_style roads2_style_1;
    rule_type roads2_rule_1;
    roads2_rule_1.set_filter(create_filter("[CLASS] = 2"));
    stroke roads2_rule_stk_1(Color(171,158,137),4.0);
    roads2_rule_stk_1.set_line_cap(ROUND_CAP);
    roads2_rule_stk_1.set_line_join(ROUND_JOIN);
    roads2_rule_1.append(line_symbolizer(roads2_rule_stk_1));
    roads2_style_1.add_rule(roads2_rule_1);
    
    m.insert_style("road-border", roads2_style_1);
    
    feature_type_style roads2_style_2;
    rule_type roads2_rule_2;
    roads2_rule_2.set_filter(create_filter("[CLASS] = 2"));
    stroke roads2_rule_stk_2(Color(255,250,115),2.0);
    roads2_rule_stk_2.set_line_cap(ROUND_CAP);
    roads2_rule_stk_2.set_line_join(ROUND_JOIN);
    roads2_rule_2.append(line_symbolizer(roads2_rule_stk_2));
    roads2_style_2.add_rule(roads2_rule_2);
    
    m.insert_style("road-fill", roads2_style_2);
    
    // Roads 1 (The big orange ones, the highways)
    feature_type_style roads1_style_1;
    rule_type roads1_rule_1;
    roads1_rule_1.set_filter(create_filter("[CLASS] = 1"));
    stroke roads1_rule_stk_1(Color(188,149,28),7.0);
    roads1_rule_stk_1.set_line_cap(ROUND_CAP);
    roads1_rule_stk_1.set_line_join(ROUND_JOIN);
    roads1_rule_1.append(line_symbolizer(roads1_rule_stk_1));
    roads1_style_1.add_rule(roads1_rule_1);
    m.insert_style("highway-border", roads1_style_1);
    
    feature_type_style roads1_style_2;
    rule_type roads1_rule_2;
    roads1_rule_2.set_filter(create_filter("[CLASS] = 1"));
    stroke roads1_rule_stk_2(Color(242,191,36),5.0);
    roads1_rule_stk_2.set_line_cap(ROUND_CAP);
    roads1_rule_stk_2.set_line_join(ROUND_JOIN);
    roads1_rule_2.append(line_symbolizer(roads1_rule_stk_2));
    roads1_style_2.add_rule(roads1_rule_2);
    m.insert_style("highway-fill", roads1_style_2);
    
    // Populated Places
    
    feature_type_style popplaces_style;
    rule_type popplaces_rule;
    text_symbolizer popplaces_text_symbolizer("GEONAME",10,Color(0,0,0));
    popplaces_text_symbolizer.set_halo_fill(Color(255,255,200));
    popplaces_text_symbolizer.set_halo_radius(1);
    popplaces_rule.append(popplaces_text_symbolizer);
    popplaces_style.add_rule(popplaces_rule);
    
    m.insert_style("popplaces",popplaces_style );
    
    // Layers
    // Provincial  polygons
    {
        parameters p;
        p["name"]="Provinces";
        p["type"]="shape";
        p["file"]="../data/boundaries";
        
        Layer lyr(p); 
        lyr.add_style("provinces");    
        m.addLayer(lyr);
    }
    
    // Drainage
    {
        parameters p;
        p["name"]="Quebec Hydrography";
        p["type"]="shape";
        p["file"]="../data/qcdrainage";
        
        Layer lyr(p); 
        lyr.add_style("drainage");    
        m.addLayer(lyr);
    }
    {
        parameters p;
        p["name"]="Ontario Hydrography";
        p["type"]="shape";
        p["file"]="../data/ontdrainage";
        
        Layer lyr(p); 
        lyr.add_style("drainage");    
        m.addLayer(lyr);
    }
    
    // Provincial boundaries
    {
        parameters p;
        p["name"]="Provincial borders";
        p["type"]="shape";
        p["file"]="../data/boundaries_l";
        
        Layer lyr(p); 
        lyr.add_style("provlines");    
        m.addLayer(lyr);
    }
    
    // Roads
    {
        parameters p;
        p["name"]="Roads";
        p["type"]="shape";
        p["file"]="../data/roads";
        
        Layer lyr(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.addLayer(lyr);        
    }
    // popplaces
    {
        parameters p;
        p["name"]="Populated Places";
        p["type"]="shape";
        p["file"]="../data/popplaces";
        
        Layer lyr(p); 
        lyr.add_style("popplaces");    
        m.addLayer(lyr);
    }
    m.zoomToBox(Envelope<double>(1405120.04127408,-247003.813399447,1706357.31328276,-25098.593149577));
    
    Image32 buf(m.getWidth(),m.getHeight());
    agg_renderer<Image32> ren(m,buf);
    ren.apply();
    
    ImageUtils::save_to_file("demo.jpg","jpeg",buf);
    ImageUtils::save_to_file("demo.png","png",buf);
    
    std::cout << "Two maps have been rendered in the current directory:\n"
        "- demo.jpg\n"
        "- demo.png\n"
        "Have a look!\n";
    
    return 0;
}