| /**************************************************************************** |
| ** |
| ** Copyright (C) 2017 The Qt Company Ltd. |
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| ** |
| ** This file is part of the QtSensors module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
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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(); |
| |
| //! [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(); |
| } |
| |