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#include <mbgl/style/sources/geojson_source_impl.hpp>
#include <mbgl/tile/tile_id.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/feature.hpp>
#include <mbgl/util/string.hpp>
#include <mapbox/geojsonvt.hpp>
#include <supercluster.hpp>
#include <cmath>
namespace mbgl {
namespace style {
class GeoJSONVTData : public GeoJSONData {
public:
GeoJSONVTData(const GeoJSON& geoJSON, const mapbox::geojsonvt::Options& options)
: impl(geoJSON, options) {
}
mapbox::feature::feature_collection<int16_t> getTile(const CanonicalTileID& tileID) final {
return impl.getTile(tileID.z, tileID.x, tileID.y).features;
}
mapbox::feature::feature_collection<double> getChildren(const std::uint32_t) final {
return {};
}
mapbox::feature::feature_collection<double>
getLeaves(const std::uint32_t, const std::uint32_t, const std::uint32_t) final {
return {};
}
std::uint8_t getClusterExpansionZoom(std::uint32_t) final {
return 0;
}
private:
mapbox::geojsonvt::GeoJSONVT impl;
};
class SuperclusterData : public GeoJSONData {
public:
SuperclusterData(const mapbox::feature::feature_collection<double>& features,
const mapbox::supercluster::Options& options)
: impl(features, options) {
}
mapbox::feature::feature_collection<int16_t> getTile(const CanonicalTileID& tileID) final {
return impl.getTile(tileID.z, tileID.x, tileID.y);
}
mapbox::feature::feature_collection<double> getChildren(const std::uint32_t cluster_id) final {
return impl.getChildren(cluster_id);
}
mapbox::feature::feature_collection<double> getLeaves(const std::uint32_t cluster_id,
const std::uint32_t limit,
const std::uint32_t offset) final {
return impl.getLeaves(cluster_id, limit, offset);
}
std::uint8_t getClusterExpansionZoom(std::uint32_t cluster_id) final {
return impl.getClusterExpansionZoom(cluster_id);
}
private:
mapbox::supercluster::Supercluster impl;
};
template <class T>
T evaluateFeature(const mapbox::feature::feature<double>& f,
const std::shared_ptr<expression::Expression>& expression,
optional<T> accumulated = nullopt) {
const expression::EvaluationResult result = expression->evaluate(accumulated, f);
if (result) {
optional<T> typed = expression::fromExpressionValue<T>(*result);
if (typed) {
return std::move(*typed);
}
}
return T();
}
// static
std::shared_ptr<GeoJSONData> GeoJSONData::create(const GeoJSON& geoJSON, const GeoJSONOptions& options) {
constexpr double scale = util::EXTENT / util::tileSize;
if (options.cluster && geoJSON.is<mapbox::feature::feature_collection<double>>() &&
!geoJSON.get<mapbox::feature::feature_collection<double>>().empty()) {
mapbox::supercluster::Options clusterOptions;
clusterOptions.maxZoom = options.clusterMaxZoom;
clusterOptions.extent = util::EXTENT;
clusterOptions.radius = ::round(scale * options.clusterRadius);
Feature feature;
clusterOptions.map = [&](const PropertyMap& properties) -> PropertyMap {
PropertyMap ret{};
if (properties.empty()) return ret;
for (const auto& p : options.clusterProperties) {
feature.properties = properties;
ret[p.first] = evaluateFeature<Value>(feature, p.second.first);
}
return ret;
};
clusterOptions.reduce = [&](PropertyMap& toReturn, const PropertyMap& toFill) {
for (const auto& p : options.clusterProperties) {
if (toFill.count(p.first) == 0) {
continue;
}
feature.properties = toFill;
optional<Value> accumulated(toReturn[p.first]);
toReturn[p.first] = evaluateFeature<Value>(feature, p.second.second, accumulated);
}
};
return std::make_shared<SuperclusterData>(geoJSON.get<mapbox::feature::feature_collection<double>>(),
clusterOptions);
}
mapbox::geojsonvt::Options vtOptions;
vtOptions.maxZoom = options.maxzoom;
vtOptions.extent = util::EXTENT;
vtOptions.buffer = ::round(scale * options.buffer);
vtOptions.tolerance = scale * options.tolerance;
vtOptions.lineMetrics = options.lineMetrics;
return std::make_shared<GeoJSONVTData>(geoJSON, vtOptions);
}
GeoJSONSource::Impl::Impl(std::string id_, optional<GeoJSONOptions> options_)
: Source::Impl(SourceType::GeoJSON, std::move(id_)) {
options = options_ ? std::move(*options_) : GeoJSONOptions{};
}
GeoJSONSource::Impl::Impl(const GeoJSONSource::Impl& other, std::shared_ptr<GeoJSONData> data_)
: Source::Impl(other), options(other.options), data(std::move(data_)) {}
GeoJSONSource::Impl::~Impl() = default;
Range<uint8_t> GeoJSONSource::Impl::getZoomRange() const {
return { options.minzoom, options.maxzoom };
}
std::weak_ptr<GeoJSONData> GeoJSONSource::Impl::getData() const {
return data;
}
optional<std::string> GeoJSONSource::Impl::getAttribution() const {
return {};
}
} // namespace style
} // namespace mbgl
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