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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ | 5 #ifndef UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ |
6 #define UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ | 6 #define UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ |
7 | 7 |
8 #include "base/macros.h" | 8 #include "base/macros.h" |
9 #include "ui/gfx/gfx_export.h" | 9 #include "ui/gfx/gfx_export.h" |
10 | 10 |
11 namespace gfx { | 11 namespace gfx { |
12 | 12 |
13 class GFX_EXPORT CubicBezier { | 13 class GFX_EXPORT CubicBezier { |
14 public: | 14 public: |
15 CubicBezier(double x1, double y1, double x2, double y2); | 15 CubicBezier(double x1, double y1, double x2, double y2); |
16 ~CubicBezier(); | 16 ~CubicBezier(); |
17 | 17 |
18 // Returns an approximation of y at the given x. | 18 // Returns an approximation of y at the given x. |
19 double Solve(double x) const; | 19 double Solve(double x) const; |
20 | 20 |
| 21 // Returns an approximation of dy/dx at the given x. |
| 22 double Slope(double x) const; |
| 23 |
21 // Sets |min| and |max| to the bezier's minimum and maximium y values in the | 24 // Sets |min| and |max| to the bezier's minimum and maximium y values in the |
22 // interval [0, 1]. | 25 // interval [0, 1]. |
23 void Range(double* min, double* max) const; | 26 void Range(double* min, double* max) const; |
24 | 27 |
25 private: | 28 private: |
26 double x1_; | 29 double x1_; |
27 double y1_; | 30 double y1_; |
28 double x2_; | 31 double x2_; |
29 double y2_; | 32 double y2_; |
30 | 33 |
31 DISALLOW_ASSIGN(CubicBezier); | 34 DISALLOW_ASSIGN(CubicBezier); |
32 }; | 35 }; |
33 | 36 |
34 } // namespace gfx | 37 } // namespace gfx |
35 | 38 |
36 #endif // UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ | 39 #endif // UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ |
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