animation.h Example File

animation/easing/animation.h
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#ifndef ANIMATION_H #define ANIMATION_H #include <QtWidgets> #include <QtCore/qpropertyanimation.h> class Animation : public QPropertyAnimation { public: enum PathType { LinearPath, CirclePath, NPathTypes }; Animation(QObject *target, const QByteArray &prop) : QPropertyAnimation(target, prop) { setPathType(LinearPath); } void setPathType(PathType pathType) { if (pathType >= NPathTypes) qWarning("Unknown pathType %d", pathType); m_pathType = pathType; m_path = QPainterPath(); } void updateCurrentTime(int currentTime) override { if (m_pathType == CirclePath) { if (m_path.isEmpty()) { QPointF to = endValue().toPointF(); QPointF from = startValue().toPointF(); m_path.moveTo(from); m_path.addEllipse(QRectF(from, to)); } int dura = duration(); const qreal progress = ((dura == 0) ? 1 : ((((currentTime - 1) % dura) + 1) / qreal(dura))); qreal easedProgress = easingCurve().valueForProgress(progress); if (easedProgress > 1.0) { easedProgress -= 1.0; } else if (easedProgress < 0) { easedProgress += 1.0; } QPointF pt = m_path.pointAtPercent(easedProgress); updateCurrentValue(pt); emit valueChanged(pt); } else { QPropertyAnimation::updateCurrentTime(currentTime); } } QPainterPath m_path; PathType m_pathType; }; #endif // ANIMATION_H