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 3 // found in the LICENSE file. 4 5 #ifndef UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ 6 #define UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ 7 8 #include "base/macros.h" 9 #include "ui/gfx/gfx_export.h" 10 11 namespace gfx { 12 13 class GFX_EXPORT CubicBezier { 14 public: 15 CubicBezier(double x1, double y1, double x2, double y2); 16 ~CubicBezier(); 17 18 // Returns an approximation of y at the given x. 19 double Solve(double x) const; 20 21 // Returns an approximation of dy/dx at the given x. 22 double Slope(double x) const; 23 24 // Sets |min| and |max| to the bezier's minimum and maximium y values in the 25 // interval [0, 1]. 26 void Range(double* min, double* max) const; 27 28 private: 29 double x1_; 30 double y1_; 31 double x2_; 32 double y2_; 33 34 DISALLOW_ASSIGN(CubicBezier); 35 }; 36 37 } // namespace gfx 38 39 #endif // UI_GFX_GEOMETRY_CUBIC_BEZIER_H_ 40