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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#pragma once
/** \file
* \ingroup freestyle
* \brief An Algorithm for Automatically Fitting Digitized Curves by Philip J. Schneider,
* \brief from "Graphics Gems", Academic Press, 1990
*/
#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();
/*! Fits a set of 2D data points to a set of Bezier Curve segments
* data
* Input data points
* oCurve
* Control points of the sets of bezier curve segments.
* Each segment is made of 4 points (polynomial degree of curve = 3)
* error
* max error tolerance between resulting curve and input data
*/
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);
/*! Draws a Bezier curve segment
* n
* degree of curve (=3)
* curve
* bezier segments control points
*/
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 */
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