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#ifndef LLMR_MAP_TRANSFORM
#define LLMR_MAP_TRANSFORM
#include <llmr/util/transition.hpp>
#include <llmr/util/noncopyable.hpp>
#include <llmr/util/uv.hpp>
#include "view.hpp"
#include "transform_state.hpp"
#include <forward_list>
namespace llmr {
struct box;
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, timestamp duration = 0);
void setLonLat(double lon, double lat, timestamp duration = 0);
void setLonLatZoom(double lon, double lat, double zoom, timestamp duration = 0);
void getLonLat(double& lon, double& lat) const;
void getLonLatZoom(double& lon, double& lat, double& zoom) const;
void startPanning();
void stopPanning();
// Zoom
void scaleBy(double ds, double cx = -1, double cy = -1, timestamp duration = 0);
void setScale(double scale, double cx = -1, double cy = -1, timestamp duration = 0);
void setZoom(double zoom, timestamp duration = 0);
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, timestamp duration = 0);
void setAngle(double angle, timestamp duration = 0);
void setAngle(double angle, double cx, double cy);
double getAngle() const;
void startRotating();
void stopRotating();
bool canRotate();
// Transitions
bool needsTransition() const;
void updateTransitions(timestamp 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, timestamp duration = 0);
void _setScale(double scale, double cx, double cy, timestamp duration = 0);
void _setScaleXY(double new_scale, double xn, double yn, timestamp duration = 0);
void _setAngle(double angle, timestamp duration = 0);
void _clearPanning();
void _clearRotating();
void _clearScaling();
void constrain(double& scale, double& y) const;
private:
View &view;
mutable uv::rwlock 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.
// TODO: make these modifiable from outside.
const double min_scale = std::pow(2, 0);
const double max_scale = std::pow(2, 18);
// cache values for spherical mercator math
double zc, Bc, Cc;
std::forward_list<std::shared_ptr<util::transition>> transitions;
std::shared_ptr<util::transition> scale_timeout;
std::shared_ptr<util::transition> rotate_timeout;
std::shared_ptr<util::transition> pan_timeout;
};
}
#endif
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