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
11namespace gfx {
12
13class 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