interpolate_curve.hpp

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/* Copyright (c) 2023 Otto Link. Distributed under the terms of the GNU General
   Public License. The full license is in the file LICENSE, distributed with
   this software. */
 
#pragma once
#include "highmap/geometry/point.hpp"
#include <functional>
 
namespace hmap
{
enum InterpolationMethodCurve : int
{
  BEZIER,      
  BSPLINE,     
  CATMULLROM,  
  DECASTELJAU, 
  POINTS_LERP  
};
 
class InterpolatorCurve
{
public:
  InterpolatorCurve(
      std::vector<Point>       points,
      InterpolationMethodCurve method = InterpolationMethodCurve::POINTS_LERP);
 
  std::vector<Point> operator()(std::vector<float> t) const;
 
private:
  // clang-format off
std::vector<Point>          points_data;   
// interpolate.
InterpolationMethodCurve method;           
// used.
std::vector<float>          arc_length;    
// between points.
std::function<Point(float)> interp;        
// interpolation based on `method`.
  // clang-format on
 
  void get_segment_interpolation_parameters(float t, size_t &ileft, float &u);
};
 
} // namespace hmap