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#include "gruesensorimpl.h"#include <QDebug>#include <QTimer>charconst*const gruesensorimpl::id("grue.gruesensor");
gruesensorimpl::gruesensorimpl(QSensor*sensor)
: QSensorBackend(sensor)
, lightLevel(QAmbientLightReading::Undefined)
{
// We need a light sensor
lightSensor =newQAmbientLightSensor(this);
connect(lightSensor, SIGNAL(readingChanged()),this, SLOT(lightChanged()));
lightSensor->connectToBackend();
// We need a timer
darkTimer =newQTimer(this);
darkTimer->setInterval(1000);
connect(darkTimer, SIGNAL(timeout()),this, SLOT(increaseChance()));
// We use this as our timestamp source
timer.start();
// Register our reading instance
setReading<GrueSensorReading>(&m_reading);
// 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"));
}
void gruesensorimpl::start()
{
lightSensor->setDataRate(sensor()->dataRate());
lightSensor->start();
// If the light sensor doesn't work we don't work eitherif (!lightSensor->isActive())
sensorStopped();
if (lightSensor->isBusy())
sensorBusy();
}
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()) {
caseQAmbientLightReading::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 eatenint 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();
}