Jumping/stuttering during animation QPainter

Hi.

I have a small testproject, where I have painted a roundedrect box, that I want to animate. My problem is that I can't get the animation to run smoothly.

The painted box is animated with a duration of 1000ms, and "stutters" frequently while moving across the dialog.

This is the code for the roundedrect box:

Code:

---

#include "groupbox.h"
#include <QPainter>
#include <QDebug>
 
GroupBox::GroupBox(QWidget *parent)
    : QWidget(parent)
{
}
 
GroupBox::~GroupBox()
{
}
 
void GroupBox::paintEvent(QPaintEvent *)
{
    QPainter painter;
    painter.begin(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setPen(QPen(QBrush(qRgb(128,128,128)), 5));
    painter.setBrush(QBrush(qRgb(46,46,46)));
    painter.drawRoundedRect(QRect(35,35,250,150),25,25);
 
    painter.end();
 
}

---

And here is the code for the animation part:

Code:

---

#include "dialog.h"
#include <QDebug>
 
Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    resize(1400,600);
 
    m_group = new GroupBox(this);
    m_group->resize(310,200);
    m_group->show();
 
    m_animation = new QPropertyAnimation(m_group, "pos", this);
    m_animation->setDuration(1000);
    m_animation->setEasingCurve(QEasingCurve::Linear);
 
    // Continuous animation from startup
    m_group->move(10, 0);
 
 
    animateMove();
    connect(m_animation, SIGNAL(finished()), this, SLOT(animateMove()));
}
 
Dialog::~Dialog()
{
}
 
 
void Dialog::animateMove()
{
    if (m_group->pos().x() != 10)
    {
        m_animation->setStartValue(m_group->pos());
        m_animation->setEndValue(QPointF(10.0,0.0));
        m_animation->start();
    }
    else
    {
        m_animation->setStartValue(m_group->pos());
        m_animation->setEndValue(QPointF(1000.0,10.0));
        m_animation->start();
    }
 
}

---

This has been tested on Linux and Windows with debug and release having the same result.

Thanks in advance for any help/hints!