author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 00:38:12 +0300 | |
changeset 30 | 80e4d18b72f5 |
parent 2 | 06ff229162e9 |
permissions | -rw-r--r-- |
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/**************************************************************************** |
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** |
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (developer.feedback@nokia.com) |
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** |
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** This file is part of the HbCore module of the UI Extensions for Mobile. |
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** |
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** GNU Lesser General Public License Usage |
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** This file may be used under the terms of the GNU Lesser General Public |
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** License version 2.1 as published by the Free Software Foundation and |
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** appearing in the file LICENSE.LGPL included in the packaging of this file. |
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** Please review the following information to ensure the GNU Lesser General |
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** Public License version 2.1 requirements will be met: |
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt LGPL Exception |
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at developer.feedback@nokia.com. |
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** |
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****************************************************************************/ |
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#include "hbpointrecorder_p.h" |
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#include <QPair> |
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#include <QDebug> |
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//#define POINT_DEBUG |
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#ifndef POINT_DEBUG |
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# define DEBUG if (0) qDebug |
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#else |
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# define DEBUG qDebug |
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#endif |
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/*! |
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@hbcore |
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\internal |
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\class HbPointRecorder |
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\brief Class to store and hold list of points and timestamps. |
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*/ |
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/*! |
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\internal |
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\brief Constructor for HbPointRecorder |
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\return |
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*/ |
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HbPointRecorder::HbPointRecorder() |
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: |
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mThreshold(0) |
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{ |
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} |
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/*! |
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\internal |
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\brief Destructor for HbPointRecorder |
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\return |
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*/ |
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HbPointRecorder::~HbPointRecorder() |
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{ |
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} |
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/*! |
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\internal |
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\brief Clears all data from the recorder |
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\param threshold set used threshold to detect movement and stops |
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*/ |
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void HbPointRecorder::resetRecorder(qreal threshold) |
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{ |
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mThreshold = threshold; |
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mPoints.clear(); |
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} |
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/*! |
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\internal |
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\brief Records point to list with timestamp. |
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\param point Point to be recorded. |
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\param time Time to be recorded. |
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\return Nothing. |
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*/ |
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void HbPointRecorder::record(qreal point, qint64 time) |
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{ |
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#ifdef POINT_DEBUG |
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if (mThreshold == 0.0f) |
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hbWarning("Threshold has not been set for HbPointRecorder"); |
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#endif |
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// Empty list always accepts first point without tests. |
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if ( !mPoints.isEmpty() ) { |
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// No point to record a point, if timestamp is less or equal with previous. |
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if ( time - lastTime() <= 0 ) { |
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DEBUG() << "Ignoring point, because no difference in time stamps."; |
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return; |
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} |
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// Don't tolerate points, which are too close to previously recorded point. |
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if ( qAbs(lastPoint() - point) < mThreshold ) { |
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DEBUG() << "Ignoring point, because it is withing threshold of previous point"; |
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return; |
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} |
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} |
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|
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// In case the list contains two or more points, direction can be |
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// determined. Each new point added needs to be checked for direction |
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// change. |
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if ( mPoints.length() > 1 ) { |
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// Clear list, on direction change. Leave the last recorded point |
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// to the list, as it can be considered as first point for new direction. |
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if ( dirChanged( point ) ) { |
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HbPointTime temp = mPoints.last(); |
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mPoints.clear(); |
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mPoints.append(temp); |
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} |
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} |
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122 |
|
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// Finally check, if the position has changed. Don't record point, when no position |
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// change. |
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if ( mPoints.isEmpty() || point != lastPoint() ) { |
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// Add point and time to list. |
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mPoints.append(HbPointTime(point, time)); |
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} else { |
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DEBUG() << "Ignoring point, because it equals previous."; |
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} |
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} |
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|
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/*! |
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\internal |
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\brief |
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\return Last recorded point. |
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137 |
|
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*/ |
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qreal HbPointRecorder::lastPoint() const |
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{ |
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Q_ASSERT(!mPoints.isEmpty()); |
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return mPoints.last().first; |
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} |
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|
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/*! |
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\internal |
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\brief |
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\return Last recorded timestamp. |
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|
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*/ |
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qint64 HbPointRecorder::lastTime() const |
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{ |
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Q_ASSERT(!mPoints.isEmpty()); |
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return mPoints.last().second; |
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} |
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|
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/*! |
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\internal |
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\brief Checks if new point causes direction change. |
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\param point The point suspected cause direction change. |
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\return True, when direction changes. |
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*/ |
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bool HbPointRecorder::dirChanged( qreal point ) const |
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{ |
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int len = mPoints.length(); |
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|
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// Without direction, the direction cannot really change |
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if ( len < 2 ) { return false; } |
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|
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qreal pos0 = mPoints.at(len-2).first; |
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qreal pos1 = mPoints.at(len-1).first; |
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qreal dir0 = pos1 - pos0; |
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qreal dir1 = point - pos1; |
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174 |
|
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// Don't react on movement, when changes happen within threshold |
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if ( qAbs(dir1) <= mThreshold ) { return false; } |
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|
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// Check for '+' and '-' -signs in directions. Opposite signs means |
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// direction change. |
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return ( dir0 < 0 && dir1 >= 0 ) || ( dir0 > 0 && dir1 <= 0 ); |
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} |
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|
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|
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/*! |
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\internal |
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\copydoc HbPointRecorder::getLastRecords |
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*/ |
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QList<HbPointTime> HbPointRecorder::getLastRecords( int number ) const |
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{ |
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number = qMin(number, mPoints.count()); |
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return mPoints.mid(mPoints.count() - number); |
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} |