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#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;
}