author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 00:38:12 +0300 | |
changeset 30 | 80e4d18b72f5 |
parent 3 | 11d3954df52a |
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 "hbvelocitycalculator_p.h" |
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#include "hbpointrecorder_p.h" |
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#include "hbgestures_p.h" |
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#include <QPointF> |
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#include <QDebug> |
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//#define VELOCITY_DEBUG |
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#ifndef VELOCITY_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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\internals |
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\class HbVelocityCalculator |
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\brief Class to calculate velocity from point. |
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*/ |
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/*! |
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\internal |
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\brief |
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\return |
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*/ |
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HbVelocityCalculator::HbVelocityCalculator( |
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const HbPointRecorder& listX, |
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const HbPointRecorder& listY ) |
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: |
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mListX( listX ), |
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mListY( listY ) |
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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 |
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*/ |
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QPointF HbVelocityCalculator::velocity( qint64 currentTime ) const |
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{ |
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QPointF velocity(0.0, 0.0); |
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velocity.setX(calculate_velocity(mListX, currentTime)); |
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velocity.setY(calculate_velocity(mListY, currentTime)); |
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DEBUG() << "Velocity: " << velocity; |
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return velocity; |
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} |
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/*! |
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\internal |
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\brief |
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\return |
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*/ |
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qreal HbVelocityCalculator::calculate_velocity( |
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const HbPointRecorder &list, |
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qint64 currentTime) const |
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{ |
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if (list.count() < 2) { |
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return 0.0; |
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} |
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if (currentTime-list.lastTime() >= HbVelocityStopTime) { |
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return 0.0; |
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} |
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// Accumulate the distance from previous point until we have sufficient sample |
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qreal delta = 0.0; |
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qint64 timeDelta = 0; |
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int i = list.count(); |
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while (timeDelta < HbVelocitySampleTime && i > 0) { |
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106 |
i--; |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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107 |
timeDelta = currentTime - list.at(i).second; |
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108 |
} |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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109 |
if(timeDelta <= 0) { |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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110 |
return 0.0; |
80e4d18b72f5
Revision: 201037
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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111 |
} |
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Revision: 201037
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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112 |
|
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Revision: 201017
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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113 |
delta = list.lastPoint() - list.at(i).first; |
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Revision: 201015
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parents:
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114 |
|
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115 |
return delta / (qreal)(timeDelta); |
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Revision: 201015
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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116 |
} |