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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "gruesensorimpl.h"
#include <QDebug>
#include <QTimer>
char const * const gruesensorimpl::id("grue.gruesensor");
gruesensorimpl::gruesensorimpl(QSensor *sensor)
: QSensorBackend(sensor)
, lightLevel(QAmbientLightReading::Undefined)
{
// We need a light sensor
lightSensor = new QAmbientLightSensor(this);
connect(lightSensor, SIGNAL(readingChanged()), this, SLOT(lightChanged()));
lightSensor->connectToBackend();
// We need a timer
darkTimer = new QTimer(this);
darkTimer->setInterval(1000);
connect(darkTimer, SIGNAL(timeout()), this, SLOT(increaseChance()));
// We use this as our timestamp source
timer.start();
//! [setReading]
// Register our reading instance
setReading<GrueSensorReading>(&m_reading);
//! [setReading]
//! [metadata]
// Supply metadata
// We can run as fast as the light sensor does
setDataRates(lightSensor);
// Only one output range, 0 to 1 in .1 increments
addOutputRange(0, 1, 0.1);
setDescription(QLatin1String("Grue Sensor"));
//! [metadata]
}
void gruesensorimpl::start()
{
//! [start]
lightSensor->setDataRate(sensor()->dataRate());
lightSensor->start();
// If the light sensor doesn't work we don't work either
if (!lightSensor->isActive())
sensorStopped();
if (lightSensor->isBusy())
sensorBusy();
//! [start]
}
void gruesensorimpl::stop()
{
lightSensor->stop();
}
void gruesensorimpl::lightChanged()
{
if (lightLevel == lightSensor->reading()->lightLevel())
return;
lightLevel = lightSensor->reading()->lightLevel();
int chance = 0;
darkTimer->stop();
switch (lightSensor->reading()->lightLevel()) {
case QAmbientLightReading::Dark:
// It is dark. You are likely to be eaten by a grue.
chance = 10;
darkTimer->start();
break;
default:
break;
}
// Only send an update if the value has changed.
if (chance != m_reading.chanceOfBeingEaten() || m_reading.timestamp() == 0) {
m_reading.setTimestamp(timer.elapsed());
m_reading.setChanceOfBeingEaten(chance);
newReadingAvailable();
}
}
void gruesensorimpl::increaseChance()
{
// The longer you stay in the dark, the higher your chance of being eaten
int chance = m_reading.chanceOfBeingEaten() + 10;
m_reading.setTimestamp(timer.elapsed());
m_reading.setChanceOfBeingEaten(chance);
newReadingAvailable();
// No point in using the timer anymore if we've hit 100... you can't get more
// likely to be eaten than 100%
if (chance >= 100)
darkTimer->stop();
}
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