void SetCornerAnnotationVisibility(bool s);
bool GetCornerAnnotationVisibility();
void GetExtremasAroundMousePointer(double & min, double & max, vtkImageData *image, vtkTransform *transform);
void SetCornerAnnotationVisibility(bool s);
bool GetCornerAnnotationVisibility();
void GetExtremasAroundMousePointer(double & min, double & max, vtkImageData *image, vtkTransform *transform);