principal_axes.h

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#ifndef GEOGRAM_POINTS_PRINCIPAL_AXES
#define GEOGRAM_POINTS_PRINCIPAL_AXES
 
#include <geogram/basic/common.h>
#include <geogram/basic/numeric.h>
#include <geogram/basic/geometry.h>
#include <geogram/basic/logger.h>
#include <geogram/numerics/matrix_util.h>
 
namespace GEO {
 
    class GEOGRAM_API PrincipalAxes3d {
    public:
    PrincipalAxes3d();
 
    void begin();
 
    void end();
 
    void add_point(const vec3& p, double weight = 1.0);
 
    vec3 center() const {
        return vec3(center_[0], center_[1], center_[2]);
    }
 
    const vec3& axis(index_t i) const {
        return axis_[i];
    }
 
    double eigen_value(index_t i) const {
        return eigen_value_[i];
    }
 
    vec3 normal() const {
        return axis(2);
    }
 
    private:
    double center_[3] ;
    vec3 axis_[3] ;
    double eigen_value_[3] ;
 
    double M_[6] ;
    int nb_points_ ;
    double sum_weights_ ;
    };
}
 
#endif