main.cpp Example File

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#include <QGuiApplication> #include <QQmlApplicationEngine> #include <QQmlContext> #include <QObject> #include <QTime> #include <QBasicTimer> #include <QDebug> #include <QEasingCurve> #include <QGeoCoordinate> #include <QtPositioning/private/qwebmercator_p.h> #define ANIMATION_DURATION 4000 class PlaneController: public QObject { Q_OBJECT Q_PROPERTY(QGeoCoordinate position READ position WRITE setPosition NOTIFY positionChanged) Q_PROPERTY(QGeoCoordinate from READ from WRITE setFrom NOTIFY fromChanged) Q_PROPERTY(QGeoCoordinate to READ to WRITE setTo NOTIFY toChanged) public: PlaneController() { easingCurve.setType(QEasingCurve::InOutQuad); easingCurve.setPeriod(ANIMATION_DURATION); } void setFrom(const QGeoCoordinate& from) { fromCoordinate = from; } QGeoCoordinate from() const { return fromCoordinate; } void setTo(const QGeoCoordinate& to) { toCoordinate = to; } QGeoCoordinate to() const { return toCoordinate; } void setPosition(const QGeoCoordinate &c) { if (currentPosition == c) return; currentPosition = c; emit positionChanged(); } QGeoCoordinate position() const { return currentPosition; } Q_INVOKABLE bool isFlying() const { return timer.isActive(); } public slots: void startFlight() { if (timer.isActive()) return; startTime = QTime::currentTime(); finishTime = startTime.addMSecs(ANIMATION_DURATION); timer.start(15, this); emit departed(); } void swapDestinations() { if (currentPosition == toCoordinate) { // swap destinations toCoordinate = fromCoordinate; fromCoordinate = currentPosition; } } signals: void positionChanged(); void arrived(); void departed(); void toChanged(); void fromChanged(); protected: void timerEvent(QTimerEvent *event) override { if (!event) return; if (event->timerId() == timer.timerId()) updatePosition(); else QObject::timerEvent(event); } private: void updatePosition() { // simple progress animation qreal progress; QTime current = QTime::currentTime(); if (current >= finishTime) { progress = 1.0; timer.stop(); } else { progress = ((qreal)startTime.msecsTo(current) / ANIMATION_DURATION); } setPosition(QWebMercator::coordinateInterpolation( fromCoordinate, toCoordinate, easingCurve.valueForProgress(progress))); if (!timer.isActive()) emit arrived(); } private: QGeoCoordinate currentPosition; QGeoCoordinate fromCoordinate, toCoordinate; QBasicTimer timer; QTime startTime, finishTime; QEasingCurve easingCurve; // ... }; int main(int argc, char *argv[]) { QGuiApplication app(argc, argv); PlaneController oslo2berlin; PlaneController berlin2london; QQmlApplicationEngine engine; engine.rootContext()->setContextProperty("oslo2Berlin", &oslo2berlin); engine.rootContext()->setContextProperty("berlin2London", &berlin2london); engine.load(QUrl(QStringLiteral("qrc:/planespotter.qml"))); return app.exec(); } #include "main.moc"

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