82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
/*****************************************************************************
|
|
|
|
Example program for vtzero library.
|
|
|
|
vtzero-streets - Copy features from road_label layer if they have property
|
|
class="street". Output is always in file "streets.mvt".
|
|
|
|
*****************************************************************************/
|
|
|
|
#include "utils.hpp"
|
|
|
|
#include <vtzero/builder.hpp>
|
|
#include <vtzero/property_mapper.hpp>
|
|
#include <vtzero/vector_tile.hpp>
|
|
|
|
#include <iostream>
|
|
#include <string>
|
|
|
|
static bool keep_feature(const vtzero::feature& feature) {
|
|
static const std::string key{"class"};
|
|
static const std::string val{"street"};
|
|
|
|
bool found = false;
|
|
|
|
feature.for_each_property([&](const vtzero::property& prop) {
|
|
found = key == prop.key() && val == prop.value().string_value();
|
|
return !found;
|
|
});
|
|
|
|
return found;
|
|
}
|
|
|
|
int main(int argc, char* argv[]) {
|
|
if (argc != 2) {
|
|
std::cerr << "Usage: " << argv[0] << " TILE\n";
|
|
return 1;
|
|
}
|
|
|
|
std::string input_file{argv[1]};
|
|
std::string output_file{"streets.mvt"};
|
|
|
|
const auto data = read_file(input_file);
|
|
|
|
try {
|
|
vtzero::vector_tile tile{data};
|
|
|
|
auto layer = get_layer(tile, "road_label");
|
|
if (!layer) {
|
|
std::cerr << "No 'road_label' layer found\n";
|
|
return 1;
|
|
}
|
|
|
|
vtzero::tile_builder tb;
|
|
vtzero::layer_builder layer_builder{tb, layer};
|
|
|
|
vtzero::property_mapper mapper{layer, layer_builder};
|
|
|
|
while (auto feature = layer.next_feature()) {
|
|
if (keep_feature(feature)) {
|
|
vtzero::geometry_feature_builder feature_builder{layer_builder};
|
|
feature_builder.copy_id(feature);
|
|
feature_builder.set_geometry(feature.geometry());
|
|
|
|
while (auto idxs = feature.next_property_indexes()) {
|
|
feature_builder.add_property(mapper(idxs));
|
|
}
|
|
|
|
feature_builder.commit();
|
|
}
|
|
}
|
|
|
|
std::string output = tb.serialize();
|
|
write_data_to_file(output, output_file);
|
|
} catch (const std::exception& e) {
|
|
std::cerr << "Error: " << e.what() << '\n';
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|