bspline_curve.h

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#pragma once
#include "vde/core/point.h"
#include <vector>
 
namespace vde::curves {
using core::Point3D;
using core::Vector3D;
 
class BSplineCurve {
public:
    BSplineCurve(std::vector<Point3D> control_points,
                 std::vector<double> knots, int degree);
 
    [[nodiscard]] Point3D evaluate(double t) const;
 
    [[nodiscard]] Vector3D derivative(double t, int order = 1) const;
 
    [[nodiscard]] int degree() const { return degree_; }
 
    [[nodiscard]] std::pair<double, double> domain() const;
 
    [[nodiscard]] const std::vector<Point3D>& control_points() const { return cp_; }
 
    [[nodiscard]] const std::vector<double>& knots() const { return knots_; }
 
    [[nodiscard]] int find_span(double t) const;
 
    [[nodiscard]] std::vector<double> basis_functions(double t, int span = -1) const;
 
    [[nodiscard]] std::vector<double> basis_derivatives(double t, int span = -1) const;
 
private:
    std::vector<Point3D> cp_;      
    std::vector<double> knots_;    
    int degree_;                   
};
 
}  // namespace vde::curves