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#ifndef MBGL_MAP_GEOMETRY_TILE
#define MBGL_MAP_GEOMETRY_TILE
#include <mapbox/variant.hpp>
#include <mbgl/style/value.hpp>
#include <mbgl/util/chrono.hpp>
#include <mbgl/util/ptr.hpp>
#include <mbgl/util/vec.hpp>
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/util/optional.hpp>
#include <cstdint>
#include <string>
#include <vector>
#include <functional>
namespace mbgl {
enum class FeatureType : uint8_t {
Unknown = 0,
Point = 1,
LineString = 2,
Polygon = 3
};
// Normalized vector tile coordinates.
// Each geometry coordinate represents a point in a bidimensional space,
// varying from -V...0...+V, where V is the maximum extent applicable.
using GeometryCoordinate = vec2<int16_t>;
using GeometryCoordinates = std::vector<GeometryCoordinate>;
using GeometryCollection = std::vector<GeometryCoordinates>;
class GeometryTileFeature : private util::noncopyable {
public:
static const uint32_t defaultExtent = 4096;
virtual ~GeometryTileFeature() = default;
virtual FeatureType getType() const = 0;
virtual optional<Value> getValue(const std::string& key) const = 0;
virtual GeometryCollection getGeometries() const = 0;
virtual uint32_t getExtent() const { return defaultExtent; }
};
class GeometryTileLayer : private util::noncopyable {
public:
virtual ~GeometryTileLayer() = default;
virtual std::size_t featureCount() const = 0;
virtual util::ptr<const GeometryTileFeature> getFeature(std::size_t) const = 0;
};
class GeometryTile : private util::noncopyable {
public:
virtual ~GeometryTile() = default;
virtual util::ptr<GeometryTileLayer> getLayer(const std::string&) const = 0;
};
class FileRequest;
class GeometryTileMonitor : private util::noncopyable {
public:
virtual ~GeometryTileMonitor() = default;
using Callback = std::function<void (std::exception_ptr,
std::unique_ptr<GeometryTile>,
optional<SystemTimePoint> modified,
optional<SystemTimePoint> expires)>;
/*
* Monitor the tile held by this object for changes. When the tile is loaded for the first time,
* or updates, the callback is executed. If an error occurs, the first parameter will be set.
* Otherwise it will be null. If there is no data for the requested tile, the second parameter
* will be null.
*
* To cease monitoring, release the returned Request.
*/
virtual std::unique_ptr<FileRequest> monitorTile(const Callback&) = 0;
};
class GeometryTileFeatureExtractor {
public:
GeometryTileFeatureExtractor(const GeometryTileFeature& feature_)
: feature(feature_) {}
optional<Value> getValue(const std::string& key) const;
private:
const GeometryTileFeature& feature;
};
} // namespace mbgl
#endif
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