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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QQUICKVELOCITYCALCULATOR_P_P_H
#define QQUICKVELOCITYCALCULATOR_P_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qpoint.h>
#include <QtCore/qelapsedtimer.h>
#include <QtCore/private/qglobal_p.h>
QT_BEGIN_NAMESPACE
class QQuickVelocityCalculator
{
public:
void startMeasuring(const QPointF &point1, qint64 timestamp = 0);
void stopMeasuring(const QPointF &m_point2, qint64 timestamp = 0);
void reset();
QPointF velocity() const;
private:
QPointF m_point1;
QPointF m_point2;
qint64 m_point1Timestamp = 0;
qint64 m_point2Timestamp = 0;
// When a timestamp isn't available, we must use a timer.
// When stopMeasuring() has been called, we store the elapsed time in point2timestamp.
QElapsedTimer m_timer;
};
QT_END_NAMESPACE
#endif // QQUICKVELOCITYCALCULATOR_P_P_H
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