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#ifndef MBGL_MAP_TRANSFORM
#define MBGL_MAP_TRANSFORM
#include <mbgl/map/transform_state.hpp>
#include <mbgl/util/geo.hpp>
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/util/vec.hpp>
#include <cstdint>
#include <cmath>
#include <forward_list>
#include <mutex>
#include <chrono>
namespace mbgl {
class View;
namespace util { class transition; }
class Transform : private util::noncopyable {
public:
Transform(View &view);
// Map view
// Note: width * ratio does not necessarily equal fb_width
bool resize(uint16_t width, uint16_t height, float ratio,
uint16_t fb_width, uint16_t fb_height);
// Position
void moveBy(double dx, double dy, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void setLatLng(LatLng latLng, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void setLatLngZoom(LatLng latLng, double zoom, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
inline const LatLng getLatLng() const { return current.getLatLng(); }
void startPanning();
void stopPanning();
// Zoom
void scaleBy(double ds, double cx = -1, double cy = -1, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void setScale(double scale, double cx = -1, double cy = -1, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void setZoom(double zoom, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
double getZoom() const;
double getScale() const;
void startScaling();
void stopScaling();
double getMinZoom() const;
double getMaxZoom() const;
// Angle
void rotateBy(double sx, double sy, double ex, double ey, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void setAngle(double angle, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void setAngle(double angle, double cx, double cy);
double getAngle() const;
void startRotating();
void stopRotating();
// Transitions
bool needsTransition() const;
void updateTransitions(std::chrono::steady_clock::time_point now);
void cancelTransitions();
// Transform state
const TransformState currentState() const;
const TransformState finalState() const;
private:
// Functions prefixed with underscores will *not* perform any locks. It is the caller's
// responsibility to lock this object.
void _moveBy(double dx, double dy, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void _setScale(double scale, double cx, double cy, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void _setScaleXY(double new_scale, double xn, double yn, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void _setAngle(double angle, std::chrono::steady_clock::duration duration = std::chrono::steady_clock::duration::zero());
void _clearPanning();
void _clearRotating();
void _clearScaling();
void constrain(double& scale, double& y) const;
private:
View &view;
mutable std::recursive_mutex mtx;
// This reflects the current state of the transform, representing the actual position of the
// map. After calling a transform function with a timer, this will likely remain the same until
// you render a new frame.
TransformState current;
// This reflects the final position of the transform, after all possible transition took place.
TransformState final;
// Limit the amount of zooming possible on the map.
const double min_scale = std::pow(2, 0);
const double max_scale = std::pow(2, 18);
std::forward_list<util::ptr<util::transition>> transitions;
util::ptr<util::transition> scale_timeout;
util::ptr<util::transition> rotate_timeout;
util::ptr<util::transition> pan_timeout;
};
}
#endif
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