How to make an QGraphicsObject animation?

[luisvaldes88]

Hi,

I am new on this forum.

I am making an application. it consits of:
1 QGraphicsView1 QGraphicsScene1 QGraphicsObject derived class.

the derived class has emits a signal when clicked, an the application goes to another state, but before it goes, it has to first animate the QGrapchisObject derived class,
that is inside the scene.

I have a list of images, and I have to animate the sequence without erasing the first image.

I think about creating a class to do the work.

#ifndef GRAPHIC_H
#define GRAPHIC_H
 
#include <QGraphicsObject>
#include <QtCore>
 
class Graphic : public QGraphicsObject
{
    Q_OBJECT
protected:
    QPixmap image;
 
public:
    enum {Type = GraphicType};
    int type() const { return Type;}
 
    Graphic(const QPixmap &pix,
            const QPointF & point = QPointF(),
            QGraphicsItem *parent = 0);
 
signals:
    void clicked();
};
 
#endif // GRAPHIC_H

#ifndef GRAPHIC_H
#define GRAPHIC_H

#include <QGraphicsObject>
#include <QtCore>

class Graphic : public QGraphicsObject
{
    Q_OBJECT
protected:
    QPixmap image;

public:
    enum {Type = GraphicType};
    int type() const { return Type;}

    Graphic(const QPixmap &pix,
            const QPointF & point = QPointF(),
            QGraphicsItem *parent = 0);

signals:
    void clicked();
};

#endif // GRAPHIC_H

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#ifndef ANIMATIONHELPER_H
#define ANIMATIONHELPER_H
 
#include <QObject>
 
class Graphic;
class QGraphicsScene;
 
class AnimationHelper : public QObject
{
    Q_OBJECT
    QList<Graphic *> m_sequence;
    QGraphicsScene *m_scene;
 
public:
    explicit AnimationHelper(QObject *parent = 0);
    explicit AnimationHelper(int pause, int duration, QGraphicsScene *scene, QObject *parent = 0);
    int m_pause;
    int m_duration;
    bool empty;
public:
    AnimationHelper(QGraphicsScene *scene, QObject *parent = 0);
    void addGraphic(Graphic * myG);
 
public slots:
    void onGraphicClicked();
 
signals:
    void clicked();
 
};
 
#endif // ANIMATIONHELPER_H

#ifndef ANIMATIONHELPER_H
#define ANIMATIONHELPER_H

#include <QObject>

class Graphic;
class QGraphicsScene;

class AnimationHelper : public QObject
{
    Q_OBJECT
    QList<Graphic *> m_sequence;
    QGraphicsScene *m_scene;

public:
    explicit AnimationHelper(QObject *parent = 0);
    explicit AnimationHelper(int pause, int duration, QGraphicsScene *scene, QObject *parent = 0);
    int m_pause;
    int m_duration;
    bool empty;
public:
    AnimationHelper(QGraphicsScene *scene, QObject *parent = 0);
    void addGraphic(Graphic * myG);

public slots:
    void onGraphicClicked();

signals:
    void clicked();

};

#endif // ANIMATIONHELPER_H

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//implementation
 
MyAnimationHelper::onMyGraphicsClicked()
{
	QSequentialAnimationGroup *animationGroup = new QSequentialAnimationGroup(this);
        animationGroup->addPause(m_pause;);
        foreach(Graphics *g, m_sequence)
        {
	    scene->addItem(g);
            QPropertyAnimation *animation = new QPropertyAnimation(g, "opacity", this);
            animation->setDuration(m_duration;);
            animation->setStartValue(qreal(0));
            animation->setEndValue(qreal(1));
            animationGroup->addAnimation(animation);
        }
        animationGroup->start(QAbstractAnimation::DeleteWhenStopped);
 
	emit clicked();
}
 
#include <QSequentialAnimationGroup>
#include <QPropertyAnimation>
#include "animationhelper.h"
#include "graphic.h"
 
AnimationHelper::AnimationHelper(QObject *parent) :
    QObject(parent)
{
}
 
AnimationHelper::AnimationHelper(int pause, int duration, QGraphicsScene *scene, QObject *parent) :
    QObject(parent), m_pause(pause), m_duration(duration), empty(true)
{
    m_scene = scene;
}
 
void AnimationHelper::addGraphic(Graphic * myG)
{
    if(empty)
    {
        empty = false;
        myG->setProperty("opacity", 1);
        m_scene->addItem(myG);
        connect(myG, SIGNAL(clicked()), this, SLOT(onGraphicClicked()));
    }
    else
    {
        myG->setProperty("opacity", 0);
        m_scene->addItem(myG);
        m_sequence.append(myG);
    }
}
 
void AnimationHelper::onGraphicClicked()
{
        QSequentialAnimationGroup *animationGroup = new QSequentialAnimationGroup(this);
        animationGroup->addPause(m_pause);
        foreach(Graphic *g, m_sequence)
        {
            QPropertyAnimation *animation = new QPropertyAnimation(g, "opacity", this);
            animation->setDuration(m_duration);
            animation->setStartValue(qreal(0));
            animation->setEndValue(qreal(1));
            animationGroup->addAnimation(animation);
        }
        animationGroup->start(QAbstractAnimation::DeleteWhenStopped);
        emit clicked();
}

//implementation

MyAnimationHelper::onMyGraphicsClicked()
{
	QSequentialAnimationGroup *animationGroup = new QSequentialAnimationGroup(this);
        animationGroup->addPause(m_pause;);
        foreach(Graphics *g, m_sequence)
        {
	    scene->addItem(g);
            QPropertyAnimation *animation = new QPropertyAnimation(g, "opacity", this);
            animation->setDuration(m_duration;);
            animation->setStartValue(qreal(0));
            animation->setEndValue(qreal(1));
            animationGroup->addAnimation(animation);
        }
        animationGroup->start(QAbstractAnimation::DeleteWhenStopped);

	emit clicked();
}

#include <QSequentialAnimationGroup>
#include <QPropertyAnimation>
#include "animationhelper.h"
#include "graphic.h"

AnimationHelper::AnimationHelper(QObject *parent) :
    QObject(parent)
{
}

AnimationHelper::AnimationHelper(int pause, int duration, QGraphicsScene *scene, QObject *parent) :
    QObject(parent), m_pause(pause), m_duration(duration), empty(true)
{
    m_scene = scene;
}

void AnimationHelper::addGraphic(Graphic * myG)
{
    if(empty)
    {
        empty = false;
        myG->setProperty("opacity", 1);
        m_scene->addItem(myG);
        connect(myG, SIGNAL(clicked()), this, SLOT(onGraphicClicked()));
    }
    else
    {
        myG->setProperty("opacity", 0);
        m_scene->addItem(myG);
        m_sequence.append(myG);
    }
}

void AnimationHelper::onGraphicClicked()
{
        QSequentialAnimationGroup *animationGroup = new QSequentialAnimationGroup(this);
        animationGroup->addPause(m_pause);
        foreach(Graphic *g, m_sequence)
        {
            QPropertyAnimation *animation = new QPropertyAnimation(g, "opacity", this);
            animation->setDuration(m_duration);
            animation->setStartValue(qreal(0));
            animation->setEndValue(qreal(1));
            animationGroup->addAnimation(animation);
        }
        animationGroup->start(QAbstractAnimation::DeleteWhenStopped);
        emit clicked();
}

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I think you could get the idea, this actually works, but the main thing is that I dont know if there is a better way of making the animation.

Best Regards.