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// Copyright 2012 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 CC_ANIMATION_ANIMATION_CURVE_H_
#define CC_ANIMATION_ANIMATION_CURVE_H_
#include "base/memory/scoped_ptr.h"
#include "cc/base/cc_export.h"
#include "ui/gfx/transform.h"
namespace cc {
class FloatAnimationCurve;
class TransformAnimationCurve;
class TransformOperations;
// An animation curve is a function that returns a value given a time.
// There are currently only two types of curve, float and transform.
class CC_EXPORT AnimationCurve {
public:
enum CurveType { Float, Transform };
virtual ~AnimationCurve() {}
virtual double Duration() const = 0;
virtual CurveType Type() const = 0;
virtual scoped_ptr<AnimationCurve> Clone() const = 0;
const FloatAnimationCurve* ToFloatAnimationCurve() const;
const TransformAnimationCurve* ToTransformAnimationCurve() const;
};
class CC_EXPORT FloatAnimationCurve : public AnimationCurve {
public:
virtual ~FloatAnimationCurve() {}
virtual float GetValue(double t) const = 0;
// Partial Animation implementation.
virtual CurveType Type() const OVERRIDE;
};
class CC_EXPORT TransformAnimationCurve : public AnimationCurve {
public:
virtual ~TransformAnimationCurve() {}
virtual gfx::Transform GetValue(double t) const = 0;
// Partial Animation implementation.
virtual CurveType Type() const OVERRIDE;
};
} // namespace cc
#endif // CC_ANIMATION_ANIMATION_CURVE_H_
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