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50
51#ifndef ANIMATION_H
52#define ANIMATION_H
53
54#include <QtWidgets>
55
56#include <QtCore/qpropertyanimation.h>
57
58class Animation : public QPropertyAnimation {
59public:
60 enum PathType {
61 LinearPath,
62 CirclePath,
63 NPathTypes
64 };
65 Animation(QObject *target, const QByteArray &prop)
66 : QPropertyAnimation(target, prop)
67 {
68 setPathType(LinearPath);
69 }
70
71 void setPathType(PathType pathType)
72 {
73 if (pathType >= NPathTypes)
74 qWarning(msg: "Unknown pathType %d", pathType);
75
76 m_pathType = pathType;
77 m_path = QPainterPath();
78 }
79
80 void updateCurrentTime(int currentTime) override
81 {
82 if (m_pathType == CirclePath) {
83 if (m_path.isEmpty()) {
84 QPointF to = endValue().toPointF();
85 QPointF from = startValue().toPointF();
86 m_path.moveTo(p: from);
87 m_path.addEllipse(rect: QRectF(from, to));
88 }
89 int dura = duration();
90 const qreal progress = ((dura == 0) ? 1 : ((((currentTime - 1) % dura) + 1) / qreal(dura)));
91
92 qreal easedProgress = easingCurve().valueForProgress(progress);
93 if (easedProgress > 1.0) {
94 easedProgress -= 1.0;
95 } else if (easedProgress < 0) {
96 easedProgress += 1.0;
97 }
98 QPointF pt = m_path.pointAtPercent(t: easedProgress);
99 updateCurrentValue(value: pt);
100 emit valueChanged(value: pt);
101 } else {
102 QPropertyAnimation::updateCurrentTime(currentTime);
103 }
104 }
105
106 QPainterPath m_path;
107 PathType m_pathType;
108};
109
110#endif // ANIMATION_H
111

source code of qtbase/examples/widgets/animation/easing/animation.h