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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/* EINA - EFL data type library
* Copyright (C) 2015 Subhransu Mohanty
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library;
* if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef EINA_BEZIER_H
#define EINA_BEZIER_H
/**
* Floating point cubic bezier curve
*/
typedef struct _Eina_Bezier Eina_Bezier;
struct _Eina_Bezier
{
struct {
double x; /**< x coordinate of start point */
double y; /**< y coordinate of start point */
} start;
struct {
double x; /**< x coordinate of 1st control point */
double y; /**< y coordinate of 1st control point */
} ctrl_start;
struct {
double x; /**< coordinate of 2nd control point */
double y; /**< y coordinate of 2nd control point */
} ctrl_end;
struct {
double x; /**< x coordinate of end point */
double y; /**< y coordinate of end point */
} end;
};
/**
* @brief Sets the values of the points of the given floating
* point cubic bezier curve.
*
* @param b The floating point bezier.
* @param start_x x coordinate of start point.
* @param start_y y coordinate of start point.
* @param ctrl_start_x x coordinate of 1st control point.
* @param ctrl_start_y y coordinate of 1st control point.
* @param ctrl_end_x x coordinate of 2nd control point.
* @param ctrl_end_y y coordinate of 2nd control point.
* @param end_x x coordinate of end point.
* @param end_y y coordinate of end point.
*
* @p b. No check is done on @p b.
* @since 1.16
*/
EAPI void eina_bezier_values_set(Eina_Bezier *b, double start_x, double start_y, double ctrl_start_x, double ctrl_start_y, double ctrl_end_x, double ctrl_end_y, double end_x, double end_y) EINA_ARG_NONNULL(1);
/**
* @brief Gets the values of the points of the given floating
* point cubic bezier curve.
*
* @param b The floating point bezier.
* @param start_x x coordinate of start point.
* @param start_y y coordinate of start point.
* @param ctrl_start_x x coordinate of 1st control point.
* @param ctrl_start_y y coordinate of 1st control point.
* @param ctrl_end_x x coordinate of 2nd control point.
* @param ctrl_end_y y coordinate of 2nd control point.
* @param end_x x coordinate of end point.
* @param end_y y coordinate of end point.
*
* @p b. No check is done on @p b.
* @since 1.16
*/
EAPI void eina_bezier_values_get(const Eina_Bezier *b, double *start_x, double *start_y, double *ctrl_start_x, double *ctrl_start_y, double *ctrl_end_x, double *ctrl_end_y, double *end_x, double *end_y) EINA_ARG_NONNULL(1);
/**
* @brief Returns the length of the given floating
* point cubic bezier curve.
*
* @param b The floating point bezier.
*
* @p b. No check is done on @p b.
* @since 1.16
*/
EAPI double eina_bezier_length_get(const Eina_Bezier *b) EINA_ARG_NONNULL(1);
/**
* @brief Returns the position of the given bezier
* at given length.
*
* @param b The floating point bezier.
* @param len The given length.
*
* @p b. No check is done on @p b.
* @since 1.16
*/
EAPI double eina_bezier_t_at(const Eina_Bezier *b, double len) EINA_ARG_NONNULL(1);
/**
* @brief Gets the point on the bezier curve at
* position t.
*
* @param b The floating point bezier.
* @param t The floating point position.
*
* @p b. No check is done on @p b.
* @since 1.16
*/
EAPI void eina_bezier_point_at(const Eina_Bezier *b, double t, double *px, double *py) EINA_ARG_NONNULL(1);
/**
* @brief Returns the slope of the bezier
* at given length.
*
* @param b The floating point bezier.
* @param len The given length.
*
* @p b. No check is done on @p b.
* @since 1.16
*/
EAPI double eina_bezier_angle_at(const Eina_Bezier *b, double t) EINA_ARG_NONNULL(1);
/**
* @brief Splits the bezier at given length.
*
* @param b The floating point bezier.
* @param len The given length.
*
* @p b. No check is done on @p b.
* @since 1.16
*/
EAPI void eina_bezier_split_at_length(const Eina_Bezier *b, double len, Eina_Bezier *left, Eina_Bezier *right) EINA_ARG_NONNULL(1);
/**
* @brief Gets the bounds of the bezier.
*
* @param b The floating point bezier.
* @param x x coordinate of bounding box.
* @param y y coordinate of bounding box.
* @param w width of bounding box.
* @param h height of bounding box.
*
* @p b. No check is done on @p b.
* @since 1.17
*/
EAPI void eina_bezier_bounds_get(const Eina_Bezier *b, double *x, double *y, double *w, double *h) EINA_ARG_NONNULL(1);
/**
* @brief Finds the bezier at the given interval.
*
* @param b The floating point bezier.
* @param t0 The start interval.
* @param t1 The end interval.
* @param result The result bezier.
*
* @p b. No check is done on @p b.
* @since 1.17
*/
EAPI void eina_bezier_on_interval(Eina_Bezier *b, double t0, double t1, Eina_Bezier *result);
#endif // EINA_BEZIER_H
|
