ui/gfx/geometry/cubic_bezier.h

   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   // Sets |min| and |max| to the bezier's minimum and maximium y values in the
  22   // interval [0, 1].
  23   void Range(double* min, double* max) const;
  24
  25  private:
  26   double x1_;
  27   double y1_;
  28   double x2_;
  29   double y2_;
  30
  31   DISALLOW_ASSIGN(CubicBezier);
  32 };
  33
  34 }  // namespace gfx
  35
  36 #endif  // UI_GFX_GEOMETRY_CUBIC_BEZIER_H_