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#ifndef MBGL_MAP_TRANSFORM_STATE
#define MBGL_MAP_TRANSFORM_STATE
#include <mbgl/map/mode.hpp>
#include <mbgl/util/geo.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/vec.hpp>
#include <mbgl/util/mat4.hpp>
#include <mbgl/util/vec4.hpp>
#include <cstdint>
#include <array>
#include <limits>
namespace mbgl {
class TileID;
class TileCoordinate;
class TransformState {
friend class Transform;
public:
TransformState(ConstrainMode = ConstrainMode::HeightOnly);
// Matrix
void matrixFor(mat4& matrix, const TileID& id, const int8_t z) const;
void getProjMatrix(mat4& matrix) const;
// Dimensions
uint16_t getWidth() const;
uint16_t getHeight() const;
// North Orientation
NorthOrientation getNorthOrientation() const;
double getNorthOrientationAngle() const;
// Position
LatLng getLatLng() const;
double pixel_x() const;
double pixel_y() const;
// Zoom
double getScale() const;
double getZoom() const;
int32_t getIntegerZoom() const;
double getZoomFraction() const;
void setMinZoom(const double minZoom);
double getMinZoom() const;
void setMaxZoom(const double maxZoom);
double getMaxZoom() const;
// Rotation
float getAngle() const;
float getAltitude() const;
float getPitch() const;
// State
bool isChanging() const;
bool isRotating() const;
bool isScaling() const;
bool isPanning() const;
bool isGestureInProgress() const;
// Conversion and projection
PrecisionPoint latLngToPoint(const LatLng&) const;
LatLng pointToLatLng(const PrecisionPoint&) const;
TileCoordinate latLngToCoordinate(const LatLng&) const;
LatLng coordinateToLatLng(const TileCoordinate&) const;
PrecisionPoint coordinateToPoint(const TileCoordinate&) const;
TileCoordinate pointToCoordinate(const PrecisionPoint&) const;
private:
bool rotatedNorth() const;
void constrain(double& scale, double& x, double& y) const;
// Limit the amount of zooming possible on the map.
double min_scale = std::pow(2, 0);
double max_scale = std::pow(2, 20);
NorthOrientation orientation = NorthOrientation::Upwards;
// logical dimensions
uint16_t width = 0, height = 0;
double xLng(double x, double worldSize) const;
double yLat(double y, double worldSize) const;
double lngX(double lon) const;
double latY(double lat) const;
double zoomScale(double zoom) const;
double scaleZoom(double scale) const;
double worldSize() const;
mat4 coordinatePointMatrix(double z) const;
mat4 getPixelMatrix() const;
/** Recenter the map so that the given coordinate is located at the given
point on screen. */
void moveLatLng(const LatLng&, const PrecisionPoint&);
void setLatLngZoom(const LatLng &latLng, double zoom);
void setScalePoint(const double scale, const PrecisionPoint& point);
private:
ConstrainMode constrainMode;
// animation state
bool rotating = false;
bool scaling = false;
bool panning = false;
bool gestureInProgress = false;
// map position
double x = 0, y = 0;
double angle = 0;
double scale = 1;
double altitude = 1.5;
double pitch = 0.0;
// cache values for spherical mercator math
double Bc = (scale * util::tileSize) / 360;
double Cc = (scale * util::tileSize) / util::M2PI;
};
} // namespace mbgl
#endif // MBGL_MAP_TRANSFORM_STATE
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