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50
51#include <QtCore>
52#include <qsensor.h>
53
54class Filter : public QSensorFilter
55{
56 int lastPercent;
57public:
58 Filter()
59 : QSensorFilter()
60 , lastPercent(0)
61 {
62 }
63
64 bool filter(QSensorReading *reading) override
65 {
66 int percent = reading->property(name: "chanceOfBeingEaten").value<int>();
67 if (percent == 0) {
68 qDebug() << "It is light. You are safe from Grues.";
69 } else if (lastPercent == 0) {
70 qDebug() << "It is dark. You are likely to be eaten by a Grue.";
71 }
72 if (percent == 100) {
73 qDebug() << "You have been eaten by a Grue!";
74 QCoreApplication::instance()->quit();
75 } else if (percent)
76 qDebug() << "Your chance of being eaten by a Grue:" << percent << "percent.";
77 lastPercent = percent;
78 return false;
79 }
80};
81
82int main(int argc, char **argv)
83{
84 QCoreApplication app(argc, argv);
85
86 QSensor sensor("GrueSensor");
87
88 Filter filter;
89 sensor.addFilter(filter: &filter);
90 sensor.start();
91
92 if (!sensor.isActive()) {
93 qWarning(msg: "The Grue sensor didn't start. You're on your own!");
94 return 1;
95 }
96
97 return app.exec();
98}
99
100

source code of qtsensors/examples/sensors/grue/console_app/main.cpp