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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;

}