Revision control
Copy as Markdown
// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QObject>
#include <QTime>
#include <QBasicTimer>
#include <QDebug>
#include <QEasingCurve>
#include <QGeoCoordinate>
#define ANIMATION_DURATION 4000
//! [PlaneController1]
class PlaneController: public QObject
{
Q_OBJECT
Q_PROPERTY(QGeoCoordinate position READ position WRITE setPosition NOTIFY positionChanged)
//! [PlaneController1]
//! [C++Pilot1]
Q_PROPERTY(QGeoCoordinate from READ from WRITE setFrom NOTIFY fromChanged)
Q_PROPERTY(QGeoCoordinate to READ to WRITE setTo NOTIFY toChanged)
//! [C++Pilot1]
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();
}
//! [C++Pilot2]
public slots:
void startFlight()
{
if (timer.isActive())
return;
startTime = QTime::currentTime();
finishTime = startTime.addMSecs(ANIMATION_DURATION);
timer.start(15, this);
emit departed();
}
//! [C++Pilot2]
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:
//! [C++Pilot3]
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(coordinateInterpolation(
fromCoordinate, toCoordinate, easingCurve.valueForProgress(progress)));
if (!timer.isActive())
emit arrived();
}
//! [C++Pilot3]
QGeoCoordinate coordinateInterpolation(const QGeoCoordinate &from, const QGeoCoordinate &to, qreal progress)
{
QPointF v = QPointF(from.latitude(), from.longitude()) * (1.-progress)
+ QPointF(to.latitude(), to.longitude()) * progress;
return QGeoCoordinate(v.x(), v.y());
}
private:
QGeoCoordinate currentPosition;
QGeoCoordinate fromCoordinate, toCoordinate;
QBasicTimer timer;
QTime startTime, finishTime;
QEasingCurve easingCurve;
//! [PlaneController2]
// ...
};
//! [PlaneController2]
//! [PlaneControllerMain]
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();
}
//! [PlaneControllerMain]
#include "main.moc"