ContourObserver.h

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#ifndef CONTOUR_OBSERVER_H
#define CONTOUR_OBSERVER_H
 
#include <cstddef>
#include <functional>
#include <string>
 
enum class ContourProgressEventType {
    Started,        
    PathPoint,      
    PathFinished,   
    Finished,       
    Failed          
};
 
struct ContourProgressEvent {
    ContourProgressEventType type = ContourProgressEventType::Started;  
 
    double level = 0.0;                                                 
 
    std::size_t path_id = 0;                                            
    std::size_t point_id = 0;                                           
 
    double x = 0.0;                                                     
    double y = 0.0;                                                     
 
    std::size_t n_paths = 0;                                            
    std::size_t n_points = 0;                                           
 
    double elapsed_seconds = 0.0;                                       
 
    std::string message;                                                
};
 
using ContourProgressCallback = std::function<void(const ContourProgressEvent&)>;
 
#endif  // CONTOUR_OBSERVER_H