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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "freefallform.h"
const int KTreshold = 2;
FreeFallForm::FreeFallForm(QWidget *parent)
: QWidget(parent)
{
setupUi(this);
dropItLabel->setText("");
m_accelerationSensor.addFilter(this);
m_accelerationSensor.start();
m_freeFallState = StateNotStarted;
}
void FreeFallForm::on_setupButton_clicked()
{
setupButton->setDisabled(true);
dropItLabel->setText("Drop it!");
freeFallTimeLabel->setText("-");
freeFallHeightLabel->setText("-");
m_freeFallState = StateSetup;
}
bool FreeFallForm::filter(QAccelerometerReading *reading)
{
switch (m_freeFallState) {
case StateSetup:
if (abs(reading->x()) < KTreshold && abs(reading->y()) < KTreshold && abs(reading->z()) < KTreshold) {
m_freeFallTimer.start();
m_freeFallState = StateFalling;
}
break;
case StateFalling:
if (abs(reading->x()) > KTreshold || abs(reading->y()) > KTreshold || abs(reading->z()) > KTreshold) {
freeFallTimeLabel->setNum(m_freeFallTimer.elapsed());
qreal t = (qreal(m_freeFallTimer.elapsed()) / 1000);
freeFallHeightLabel->setNum(9.81 / 2 * t * t);
m_freeFallState = StateNotStarted;
setupButton->setEnabled(true);
setupButton->setFocus();
dropItLabel->setText("");
}
break;
default:
break;
}
return false;
}
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