1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef __FITCURVE_H__
#define __FITCURVE_H__
/** \file blender/freestyle/intern/geometry/FitCurve.h
* \ingroup freestyle
* \brief An Algorithm for Automatically Fitting Digitized Curves by Philip J. Schneider,
* \brief from "Graphics Gems", Academic Press, 1990
* \author Stephane Grabli
* \date 06/06/2003
*/
#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 LIB_GEOMETRY_EXPORT FitCurveWrapper
{
private:
std::vector<Vector2> _vertices;
public:
FitCurveWrapper();
~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 */
#endif // __FITCURVE_H__
|