--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hbcore/gestures/hbpointrecorder_p.cpp	Mon May 03 12:48:33 2010 +0300
@@ -0,0 +1,228 @@
+/****************************************************************************
+**
+** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (developer.feedback@nokia.com)
+**
+** This file is part of the HbCore module of the UI Extensions for Mobile.
+**
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this file.
+** Please review the following information to ensure the GNU Lesser General
+** Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at developer.feedback@nokia.com.
+**
+****************************************************************************/
+
+#include "hbpointrecorder_p.h"
+
+#include <QDebug>
+//#define VELOCITY_DEBUG
+#ifndef VELOCITY_DEBUG
+# define DEBUG if (0) qDebug
+#else
+# define DEBUG qDebug
+#endif
+
+/*!
+   @hbcore
+   \internal
+   \class HbPointRecorder
+
+   \brief Class to store and hold list of points and timestamps.
+
+*/
+
+/*!
+    \internal
+    \brief Constructor for HbPointRecorder
+    \return
+
+*/
+HbPointRecorder::HbPointRecorder()
+{
+}
+
+/*!
+    \internal
+    \brief Destructor for HbPointRecorder
+    \return
+
+*/
+HbPointRecorder::~HbPointRecorder()
+{
+}
+
+/*!
+    \internal
+    \brief Records point to list with timestamp.
+    \param point Point to be recorded.
+    \param time Time to be recorded.
+    \return Nothing.
+
+*/
+void HbPointRecorder::record(qreal point, QTime time)
+{
+    // No point to record a point, if timestamp is less or equal with previous.
+    if ( !isEmpty() && lastTime().msecsTo(time) == 0 )
+    {
+        DEBUG() << "Ignoring point, because no difference in time stamps.";
+        return;
+    }
+
+    // In case the list contains two or more points, direction can be
+    // determined. Each new point added needs to be checked for direction
+    // change.
+    if ( mPoints.length() > 1 )
+    {
+        // Clear list, on direction change. Leave the last recorded point
+        // to the list, as it can be considered as first point for new direction.
+        if ( dirChanged( point ) )
+        {
+            qreal tempPoint = lastPoint();
+            QTime tempTime = lastTime();
+
+            clear();
+
+            mPoints.append( tempPoint );
+            mTimes.append( tempTime );
+        }
+    }
+
+    // Finally check, if the position has changed. Don't record point, when no position
+    // change.
+    if ( isEmpty() || point != lastPoint() )
+    {
+        // Add point and time to list.
+        mPoints.append( point );
+        mTimes.append( time );
+    }
+    else
+    {
+        DEBUG() << "Ignoring point, because it equals previous.";
+    }
+}
+
+/*!
+    \internal
+    \brief
+    \return True, when no recorded items.
+
+*/
+bool HbPointRecorder::isEmpty() const
+{
+    // This situation should be impossible to even happen, but in case
+    // the lists are out of sync. The result of empty list dictates the
+    // result of this test.
+    return !mTimes.length() && !mPoints.length();
+}
+
+/*!
+    \internal
+    \brief
+    \return Last recorded point.
+
+*/
+qreal HbPointRecorder::lastPoint() const
+{
+    Q_ASSERT(!isEmpty());
+    return mPoints.last();
+}
+
+/*!
+    \internal
+    \brief
+    \return Last recorded timestamp.
+
+*/
+const QTime& HbPointRecorder::lastTime() const
+{
+    Q_ASSERT(!isEmpty());
+    return mTimes.last();
+}
+
+/*!
+    \internal
+    \brief Checks if new point causes direction change.
+    \param point The point suspected cause direction change.
+    \return True, when direction changes.
+*/
+bool HbPointRecorder::dirChanged( qreal point ) const
+{
+    qreal x0 = mPoints.at(mPoints.length()-2);
+    qreal x1 = mPoints.at(mPoints.length()-1);
+    qreal dir0 = x1 - x0;
+    qreal dir1 = point - x1;
+
+    // Check for '+' and '-' -signs in directions. Opposite signs means
+    // direction change.
+    return ( dir0 < 0 && dir1 >= 0 ) || ( dir0 > 0 && dir1 <= 0 );
+}
+
+/*!
+    \internal
+    \param T type of items in the list.
+    \brief Returns given number of items from the end.
+    \return List of items.
+
+    This function gets items from the given list from the end by the
+    amount of items specified by 'number' parameter. In case, when the
+    length of the list is less than required number of items, complete
+    list is provided instead.
+*/
+template <class T>
+QList<T> HbPointRecorder::getLastItems( QList<T> list, int number ) const
+{
+    if ( list.length() <= number )
+    {
+        return list;
+    }
+    else
+    {
+        QList<T> tempList;
+        for ( int i = list.length(); --i >= list.length()-number; )
+        {
+            tempList.insert(0, list.at(i));
+        }
+        return tempList;
+    }
+}
+
+/*!
+    \internal
+    \copydoc HbPointRecorder::getLastItems
+*/
+QList<qreal> HbPointRecorder::getLastPoints( int number ) const
+{
+    return getLastItems(mPoints, number);
+}
+
+/*!
+    \internal
+    \copydoc HbPointRecorder::getLastItems
+*/
+QList<QTime> HbPointRecorder::getLastTimes( int number ) const
+{
+    return getLastItems(mTimes, number);
+}
+
+/*!
+    \internal
+    \brief
+    \return Last recorded timestamp.
+
+*/
+void HbPointRecorder::clear()
+{
+    mPoints.clear();
+    mTimes.clear();
+}