bspline_surface.h

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#pragma once
#include "vde/core/point.h"
#include "vde/curves/bspline_curve.h"
#include <vector>
 
namespace vde::curves {
using core::Point3D;
using core::Vector3D;
 
class BSplineSurface {
public:
    BSplineSurface(std::vector<std::vector<Point3D>> control_grid,
                   std::vector<double> knots_u, std::vector<double> knots_v,
                   int degree_u, int degree_v);
 
    [[nodiscard]] Point3D evaluate(double u, double v) const;
 
    [[nodiscard]] Vector3D derivative_u(double u, double v) const;
 
    [[nodiscard]] Vector3D derivative_v(double u, double v) const;
 
    [[nodiscard]] Vector3D normal(double u, double v) const;
 
    [[nodiscard]] int degree_u() const { return degree_u_; }
 
    [[nodiscard]] int degree_v() const { return degree_v_; }
 
    [[nodiscard]] const std::vector<double>& knots_u() const { return knots_u_; }
 
    [[nodiscard]] const std::vector<double>& knots_v() const { return knots_v_; }
 
private:
    std::vector<std::vector<Point3D>> cp_;   
    std::vector<double> knots_u_, knots_v_;  
    int degree_u_, degree_v_;                
};
 
}  // namespace vde::curves