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#include <mbgl/tile/geojson_tile.hpp>
#include <mbgl/storage/file_source.hpp>
#include <mapbox/geojsonvt.hpp>
namespace mbgl {
GeoJSONTileFeature::GeoJSONTileFeature(FeatureType type_,
GeometryCollection&& geometries_,
GeoJSONTileFeature::Tags&& tags_)
: type(type_), geometries(std::move(geometries_)), tags(std::move(tags_)) {
}
FeatureType GeoJSONTileFeature::getType() const {
return type;
}
optional<Value> GeoJSONTileFeature::getValue(const std::string& key) const {
auto it = tags.find(key);
if (it != tags.end()) {
return optional<Value>(it->second);
}
return optional<Value>();
}
GeometryCollection GeoJSONTileFeature::getGeometries() const {
return geometries;
}
GeoJSONTileLayer::GeoJSONTileLayer(Features&& features_) : features(std::move(features_)) {
}
std::size_t GeoJSONTileLayer::featureCount() const {
return features.size();
}
util::ptr<const GeometryTileFeature> GeoJSONTileLayer::getFeature(std::size_t i) const {
return features[i];
}
GeoJSONTile::GeoJSONTile(std::shared_ptr<GeoJSONTileLayer> layer_) : layer(std::move(layer_)) {
}
util::ptr<GeometryTileLayer> GeoJSONTile::getLayer(const std::string&) const {
// We're ignoring the layer name because GeoJSON tiles only have one layer.
return layer;
}
// Converts the geojsonvt::Tile to a a GeoJSONTile. They have a differing internal structure.
std::unique_ptr<GeoJSONTile> convertTile(const mapbox::geojsonvt::Tile& tile) {
std::shared_ptr<GeoJSONTileLayer> layer;
if (tile) {
std::vector<std::shared_ptr<const GeoJSONTileFeature>> features;
GeometryCoordinates line;
for (auto& feature : tile.features) {
const FeatureType featureType =
(feature.type == mapbox::geojsonvt::TileFeatureType::Point
? FeatureType::Point
: (feature.type == mapbox::geojsonvt::TileFeatureType::LineString
? FeatureType::LineString
: (feature.type == mapbox::geojsonvt::TileFeatureType::Polygon
? FeatureType::Polygon
: FeatureType::Unknown)));
if (featureType == FeatureType::Unknown) {
continue;
}
GeometryCollection geometry;
// Flatten the geometry; GeoJSONVT distinguishes between a Points array and Rings array
// (Points = GeoJSON types Point, MultiPoint, LineString)
// (Rings = GeoJSON types MultiLineString, Polygon, MultiPolygon)
// However, in Mapbox GL, we use one structure for both types, and just have one outer
// element for Points.
if (feature.tileGeometry.is<mapbox::geojsonvt::TilePoints>()) {
line.clear();
for (auto& point : feature.tileGeometry.get<mapbox::geojsonvt::TilePoints>()) {
line.emplace_back(point.x, point.y);
}
geometry.emplace_back(std::move(line));
} else if (feature.tileGeometry.is<mapbox::geojsonvt::TileRings>()) {
for (auto& ring : feature.tileGeometry.get<mapbox::geojsonvt::TileRings>()) {
line.clear();
for (auto& point : ring) {
line.emplace_back(point.x, point.y);
}
geometry.emplace_back(std::move(line));
}
}
GeoJSONTileFeature::Tags tags{ feature.tags.begin(), feature.tags.end() };
features.emplace_back(std::make_shared<GeoJSONTileFeature>(
featureType, std::move(geometry), std::move(tags)));
}
layer = std::make_unique<GeoJSONTileLayer>(std::move(features));
}
return std::make_unique<GeoJSONTile>(layer);
}
GeoJSONTileMonitor::GeoJSONTileMonitor(mapbox::geojsonvt::GeoJSONVT* geojsonvt_, const TileID& id)
: tileID(id), geojsonvt(geojsonvt_) {
}
GeoJSONTileMonitor::~GeoJSONTileMonitor() = default;
// A monitor can have its GeoJSONVT object swapped out (e.g. when loading a new GeoJSON file).
// In that case, we're sending new notifications to all observers.
void GeoJSONTileMonitor::setGeoJSONVT(mapbox::geojsonvt::GeoJSONVT* vt) {
// Don't duplicate notifications in case of nil changes.
if (geojsonvt != vt) {
geojsonvt = vt;
update();
}
}
void GeoJSONTileMonitor::update() {
if (geojsonvt) {
auto tile = convertTile(geojsonvt->getTile(tileID.z, tileID.x, tileID.y));
callback(nullptr, std::move(tile), {}, {});
}
}
std::unique_ptr<AsyncRequest>
GeoJSONTileMonitor::monitorTile(const GeometryTileMonitor::Callback& cb) {
callback = cb;
update();
return nullptr;
}
} // namespace mbgl
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