gruesensorimpl.cpp Example File


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#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(); // 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 either if (!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()) { 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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