math_bspline.h

Go to the documentation of this file.

#ifndef MATH_BSPLINE_H
#define MATH_BSPLINE_H
 
namespace ModuleBase
{
 
class Bspline
{
  private:
    int norder; // the order of bezier base; norder >= 0
    double Dx; // Dx: the interval of control node
    double xi; // xi: the starting point
    double *bezier; // bezier[n] = Bk[n]
 
  public:
    Bspline();
    ~Bspline();
 
    void init(int norderin, double Dxin, double xiin);
 
    // Get the result of i-th bezier base functions for different input x+xi+n*Dx.
    // x should be in [0,Dx]
    // n-th result is stored in bezier[n];
    void getbspline(double x);
 
    // get the element of bezier
    double bezier_ele(int n);
};
} // namespace ModuleBase
#endif