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// 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:
void InitGradients();
double x1_;
double y1_;
double x2_;
double y2_;
double start_gradient_;
double end_gradient_;
DISALLOW_ASSIGN(CubicBezier);
};
} // namespace gfx
#endif // UI_GFX_GEOMETRY_CUBIC_BEZIER_H_
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