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// Copyright (C) 2020 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QT3DANIMATION_ANIMATION_FUNCTIONRANGEFINDER_P_H
#define QT3DANIMATION_ANIMATION_FUNCTIONRANGEFINDER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qlist.h>
#include <private/qglobal_p.h>
#include <cmath>
#include <cstdlib>
QT_BEGIN_NAMESPACE
namespace Qt3DAnimation {
namespace Animation {
class Q_AUTOTEST_EXPORT FunctionRangeFinder
{
public:
FunctionRangeFinder(QList<float> *x);
inline int findLowerBound(float x) const { return m_correlated ? hunt(x) : locate(x); }
int rangeSize() const { return m_rangeSize; }
void setRangeSize(int rangeSize) { m_rangeSize = rangeSize; }
bool isAscending() const { return m_ascending; }
void setAscending(bool ascending) { m_ascending = ascending; }
int correlationThreshold() const { return m_correlationThreshold; }
void updateAutomaticCorrelationThreshold()
{
m_correlationThreshold = std::max(1, int(std::pow(float(m_x->size()), 0.25)));
}
private:
int locate(float x) const;
int hunt(float x) const;
QList<float> *m_x;
mutable qsizetype m_previousLowerBound;
mutable bool m_correlated;
int m_rangeSize;
int m_correlationThreshold;
bool m_ascending;
};
} // namespace Animation
} // namespace Qt3DAnimation
QT_END_NAMESPACE
#endif // QT3DANIMATION_ANIMATION_FUNCTIONRANGEFINDER_P_H
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