FitCurve.h

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include <vector>
 
#include "Geom.h"
 
#include "../system/FreestyleConfig.h"
 
namespace Freestyle {
 
using namespace Geometry;
 
/* 2d point */
typedef struct Point2Struct {
  double coordinates[2];
 
  Point2Struct()
  {
    coordinates[0] = 0;
    coordinates[1] = 0;
  }
 
  inline double operator[](const int i) const
  {
    return coordinates[i];
  }
 
  inline double &operator[](const int i)
  {
    return coordinates[i];
  }
 
  inline double x() const
  {
    return coordinates[0];
  }
 
  inline double y() const
  {
    return coordinates[1];
  }
} Point2;
 
typedef Point2 Vector2;
 
class FitCurveWrapper {
 private:
  std::vector<Vector2> _vertices;
 
 public:
  ~FitCurveWrapper();
 
  void FitCurve(std::vector<Vec2d> &data, std::vector<Vec2d> &oCurve, double error);
 
 protected:
  /* Vec2d  *d;    Array of digitized points
   * int    nPts;  Number of digitized points
   * double error; User-defined error squared
   */
  void FitCurve(Vector2 *d, int nPts, double error);
 
  void DrawBezierCurve(int n, Vector2 *curve);
 
  /* Vec2d  *d;           Array of digitized points
   * int    first, last;  Indices of first and last pts in region
   * Vec2d  tHat1, tHat2; Unit tangent vectors at endpoints
   * double error;        User-defined error squared
   */
  void FitCubic(Vector2 *d, int first, int last, Vector2 tHat1, Vector2 tHat2, double error);
};
 
} /* namespace Freestyle */