| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ |
| #define UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ |
| |
| #include "base/macros.h" |
| #include "ui/gfx/gfx_export.h" |
| |
| namespace gfx { |
| |
| class GFX_EXPORT CubicBezier { |
| public: |
| CubicBezier(double x1, double y1, double x2, double y2); |
| ~CubicBezier(); |
| |
| // Returns an approximation of y at the given x. |
| double Solve(double x) const; |
| |
| // Returns an approximation of dy/dx at the given x. |
| double Slope(double x) const; |
| |
| // Sets |min| and |max| to the bezier's minimum and maximium y values in the |
| // interval [0, 1]. |
| void Range(double* min, double* max) const; |
| |
| private: |
| double x1_; |
| double y1_; |
| double x2_; |
| double y2_; |
| |
| DISALLOW_ASSIGN(CubicBezier); |
| }; |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ |