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#include <mbgl/style/conversion_impl.hpp>
#include <mbgl/style/expression/compound_expression.hpp>
#include <mbgl/style/expression/dsl.hpp>
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/literal.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <mbgl/style/property_expression.hpp>
#include <mbgl/style/sources/geojson_source_impl.hpp>
#include <mbgl/tile/tile_id.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/string.hpp>
#include <rapidjson/document.h>
#include <rapidjson/error/en.h>
#include <mapbox/geojsonvt.hpp>
#include <mbgl/style/conversion/constant.hpp>
#include <mbgl/style/conversion/json.hpp>
#include <supercluster.hpp>
#include <cmath>
#include <functional>
namespace mbgl {
namespace style {
template <class T>
PropertyExpression<T> createPropertyExpression(const char* expr) {
using JSValue = rapidjson::GenericValue<rapidjson::UTF8<>, rapidjson::CrtAllocator>;
rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> document;
document.Parse<0>(expr);
assert(!document.HasParseError());
// optional<expression::TypeAnnotationOption> typeAnnotationOption;
const JSValue* expression = &document;
expression::ParsingContext ctx;
expression::ParseResult parsed =
ctx.parseExpression(mbgl::style::conversion::Convertible(expression));
return PropertyExpression<T>(std::move(*parsed));
}
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;
};
GeoJSONSource::Impl::Impl(std::string id_, GeoJSONOptions options_)
: Source::Impl(SourceType::GeoJSON, std::move(id_)), options(std::move(options_)) {
}
GeoJSONSource::Impl::Impl(const Impl& other, const GeoJSON& geoJSON)
: Source::Impl(other), options(other.options) {
constexpr double scale = util::EXTENT / util::tileSize;
options.clusterProperties =
std::unordered_map<std::string, std::pair<std::string, std::string>>{
{ "max", { "+", R"(["get", "scalerank"])" } }
};
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);
std::unordered_map<std::string, PropertyExpression<double>> mapExpressions;
std::unordered_map<std::string, PropertyExpression<double>> reduceExpressions;
for (const auto& p : options.clusterProperties) {
mapExpressions.emplace(p.first,
createPropertyExpression<double>(p.second.second.c_str()));
std::stringstream ss;
// [operator, ['accumulated'], ['get', key]]
ss << std::string(R"([")") << p.second.first
<< std::string(R"(", ["accumulated"], ["get", ")") << p.first
<< std::string(R"("]])");
reduceExpressions.emplace(p.first, createPropertyExpression<double>(ss.str().c_str()));
}
clusterOptions.map =
[&](const mapbox::feature::property_map& properties) -> mapbox::feature::property_map {
mapbox::feature::property_map ret{};
for (const auto& p : options.clusterProperties) {
auto feature = mapbox::feature::feature<double>();
feature.properties = properties;
auto iter = mapExpressions.find(p.first);
if (iter != mapExpressions.end()) {
ret[p.first] = iter->second.evaluate(nullopt, feature);
}
}
return ret;
};
clusterOptions.reduce = [&](mapbox::feature::property_map& toReturn,
const mapbox::feature::property_map& toFill) {
for (const auto& p : options.clusterProperties) {
auto feature = mapbox::feature::feature<double>();
feature.properties = toFill;
optional<double> accumulated(toReturn[p.first].get<double>());
auto iter = reduceExpressions.find(p.first);
if (iter != reduceExpressions.end()) {
toReturn[p.first] = iter->second.evaluate(accumulated, feature);
}
}
};
data = std::make_shared<SuperclusterData>(
geoJSON.get<mapbox::feature::feature_collection<double>>(), clusterOptions);
} else {
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;
data = std::make_shared<GeoJSONVTData>(geoJSON, vtOptions);
}
}
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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