text: /****************************************************************************
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  ** Copyright (C) 2016 The Qt Company Ltd.
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  ** This file is part of the QtWidgets module of the Qt Toolkit.
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  ** GNU Lesser General Public License Usage
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  ****************************************************************************/
  
  #ifndef QGRAPHICSITEMANIMATION_H
  #define QGRAPHICSITEMANIMATION_H
  
  #include <QtWidgets/qtwidgetsglobal.h>
  #include <QtCore/qobject.h>
  
  QT_REQUIRE_CONFIG(graphicsview);
  
  QT_BEGIN_NAMESPACE
  
  class QGraphicsItem;
  class QMatrix;
  class QPointF;
  class QTimeLine;
  template <class T1, class T2> struct QPair;
  
  class QGraphicsItemAnimationPrivate;
  class Q_WIDGETS_EXPORT QGraphicsItemAnimation : public QObject
  {
      Q_OBJECT
  public:
      QGraphicsItemAnimation(QObject *parent = Q_NULLPTR);
      virtual ~QGraphicsItemAnimation();
  
      QGraphicsItem *item() const;
      void setItem(QGraphicsItem *item);
  
      QTimeLine *timeLine() const;
      void setTimeLine(QTimeLine *timeLine);
  
      QPointF posAt(qreal step) const;
      QList<QPair<qreal, QPointF> > posList() const;
      void setPosAt(qreal step, const QPointF &pos);
  
      QMatrix matrixAt(qreal step) const;
  
      qreal rotationAt(qreal step) const;
      QList<QPair<qreal, qreal> > rotationList() const;
      void setRotationAt(qreal step, qreal angle);
  
      qreal xTranslationAt(qreal step) const;
      qreal yTranslationAt(qreal step) const;
      QList<QPair<qreal, QPointF> > translationList() const;
      void setTranslationAt(qreal step, qreal dx, qreal dy);
  
      qreal verticalScaleAt(qreal step) const;
      qreal horizontalScaleAt(qreal step) const;
      QList<QPair<qreal, QPointF> > scaleList() const;
      void setScaleAt(qreal step, qreal sx, qreal sy);
  
      qreal verticalShearAt(qreal step) const;
      qreal horizontalShearAt(qreal step) const;
      QList<QPair<qreal, QPointF> > shearList() const;
      void setShearAt(qreal step, qreal sh, qreal sv);
  
      void clear();
  
  public Q_SLOTS:
      void setStep(qreal x);
      void reset();
  
  protected:
      virtual void beforeAnimationStep(qreal step);
      virtual void afterAnimationStep(qreal step);
  
  private:
      Q_DISABLE_COPY(QGraphicsItemAnimation)
      QGraphicsItemAnimationPrivate *d;
  };
  
  QT_END_NAMESPACE
  
  #endif
  