Hi, i want to scale an image and i already did it with help of it: http://wiki.forum.nokia.com/index.ph...s_item_scaling but the scaling is made from point(0,0) and i want that the scaling is made from the center of the image.
I try it for the last hours without success (i'm despairing :s)
I attached the project and the code are below:

Qt Code: 
  1. //main.cpp
  2.  
  3. #include <QtGui/QApplication>
  4. #include "mainwindow.h"
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.     QApplication a(argc, argv);
  9.     MainWindow w;
  10.     w.setFixedSize(240,320);
  11.     //w.setMinimumSize(240,320);
  12.     w.show();
  13.     return a.exec();
  14. }
To copy to clipboard, switch view to plain text mode 
Qt Code: 
  1. //mainwindow.cpp
  2.  
  3. #include "mainwindow.h"
  4. #include <QDebug>
  5. #include <QAction>
  6. #include <QFile>
  7.  
  8. bool zoomIn=false;
  9.  
  10. PictureItem::PictureItem(QSizeF size, const QPixmap& pixmap, QObject* parent) :
  11.     QObject(parent), QGraphicsPixmapItem(pixmap)
  12. {
  13.     m_size = size;
  14.     setCacheMode(DeviceCoordinateCache);
  15. }
  16.  
  17. PictureItem::~PictureItem()
  18. {
  19. }
  20.  
  21. QRectF PictureItem::boundingRect() const
  22. {
  23. return QRectF(0, 0, m_size.width(), m_size.height());
  24. }
  25.  
  26. void PictureItem::animatePosition(const QPointF& start, const QPointF& end)
  27. {
  28.     // Start animate this class
  29.     QPropertyAnimation* anim = new QPropertyAnimation(this, "pos");
  30.  
  31.     // 2 second duration animation
  32.     anim->setDuration(500);
  33.     // position to start animation
  34.     anim->setStartValue(start);
  35.     // end position of animation
  36.     anim->setEndValue(end);
  37.     // easing curve
  38.     anim->setEasingCurve(QEasingCurve::OutQuad);
  39.  
  40.     // Listen animation finished signal
  41.     QObject::connect(anim, SIGNAL(finished()), this, SLOT(animationFinished()));
  42.  
  43.     // Start animation and delete QPropertyAnimation class on the end
  44.     anim->start(QAbstractAnimation::DeleteWhenStopped);
  45. }
  46.  
  47. void PictureItem::animateScale(qreal start, qreal end)
  48. {
  49.     // Start animate this class
  50.     QPropertyAnimation* anim = new QPropertyAnimation(this, "scale");
  51.     anim->setDuration(1000);
  52.     anim->setStartValue(start);
  53.     anim->setEndValue(end);
  54.     anim->setEasingCurve(QEasingCurve::InOutBack);
  55.     QObject::connect(anim, SIGNAL(finished()), this, SLOT(animationFinished()));
  56.  
  57.     anim->start(QAbstractAnimation::DeleteWhenStopped);
  58. }
  59.  
  60. void PictureItem::animationFinished()
  61. {
  62.     qDebug()<<"Animation Finished!";
  63. }
  64.  
  65. MainWindow::MainWindow(QWidget *parent)
  66.     : QMainWindow(parent)
  67. {
  68.  
  69.     // Create QGraphicsScene and QGraphicsView
  70.     m_scene = new QGraphicsScene(this);
  71.     m_view = new QGraphicsView(m_scene,this);
  72.     m_view->setCacheMode(QGraphicsView::CacheBackground);
  73.     m_view->setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
  74.     m_view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  75.     m_view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  76.  
  77.     // Create PictureItem for the animation
  78.     QPixmap pixmap(":/qt1.jpg");
  79.     m_item = new PictureItem(pixmap.size(),pixmap,this);
  80.  
  81.     // Add PictureItem to center of the scene
  82.     m_scene->addItem(m_item);
  83.     m_item->setScale(0.5);
  84.     createMenu();
  85.  
  86.     this->setCentralWidget(m_view);
  87.  
  88. }
  89.  
  90. MainWindow::~MainWindow()
  91. {
  92. }
  93.  
  94. void MainWindow::resizeEvent(QResizeEvent *)
  95. {
  96.     // Update scene rect
  97.     m_scene->setSceneRect(m_view->rect());
  98.  
  99.     // Calculate center point for the picture
  100.     m_center = QPointF((rect().width()-m_item->boundingRect().width()*m_item->scale())/2,
  101.                       (rect().height()-m_item->boundingRect().height()*m_item->scale())/2 );
  102.  
  103.     // Set picture to center of the sceen
  104.     m_item->setPos(m_center);
  105. }
  106.  
  107. void MainWindow::mousePressEvent(QMouseEvent *)
  108. {
  109.     // Set picture to center of the sceen
  110.     m_item->setPos(m_center);
  111.     m_item->setScale(0.5);
  112. }
  113.  
  114. void MainWindow::createMenu()
  115. {
  116.     QMenu* menu = this->menuBar()->addMenu("Animate");
  117.     menu->addAction("Position", this, SLOT(animatePos()));
  118.     menu->addAction("Scale", this, SLOT(animateScale()));
  119. }
  120.  
  121. void MainWindow::animatePos()
  122. {
  123.     // Animate picture position
  124.     m_item->animatePosition(m_item->pos(),QPoint(0-this->rect().size().width(),0));
  125. }
  126.  
  127. void MainWindow::animateScale()
  128. {
  129.     m_item->animateScale(1.0,2.0);
  130. }
To copy to clipboard, switch view to plain text mode 
Qt Code: 
  1. //mainwindow.h
  2.  
  3. #ifndef MAINWINDOW_H
  4. #define MAINWINDOW_H
  5.  
  6. #include <QtGui>
  7.  
  8. class PictureItem: public QObject, public QGraphicsPixmapItem
  9. {
  10. Q_OBJECT
  11.     // For Property animation:
  12.  
  13.     // Change picture position
  14.     Q_PROPERTY(QPointF pos READ pos WRITE setPos)
  15.  
  16.     // Scale picture
  17.     Q_PROPERTY(qreal scale READ scale WRITE setScale)
  18.  
  19. public:
  20.     enum
  21.     {
  22.         PictureItemType = UserType + 1
  23.     };
  24.  
  25. public:
  26.     PictureItem(QSizeF size, const QPixmap& pixmap = 0, QObject* parent = 0);
  27.     ~PictureItem();
  28.  
  29.     QRectF boundingRect() const;
  30.  
  31.     int type() const
  32.     {
  33.         return PictureItemType;
  34.     }
  35.  
  36.     // Animate position of this class
  37.     void animatePosition(const QPointF& start, const QPointF& end);
  38.  
  39.     // Animate scale for this class
  40.     void animateScale(qreal start, qreal end);
  41.  
  42. public slots:
  43.     void animationFinished();
  44.  
  45. private:
  46.     QSizeF m_size;
  47. };
  48.  
  49. class MainWindow : public QMainWindow
  50. {
  51.     Q_OBJECT
  52.  
  53. public:
  54.     MainWindow(QWidget *parent = 0);
  55.     ~MainWindow();
  56.  
  57.     void resizeEvent(QResizeEvent *);
  58.     void mousePressEvent(QMouseEvent *);
  59.     void createMenu();
  60.  
  61. public slots:
  62.     void animatePos();
  63.     void animateScale();
  64.  
  65. private:
  66.     QGraphicsScene* m_scene;
  67.     QGraphicsView* m_view;
  68.     PictureItem* m_item;
  69.     QPointF m_center;
  70. };
  71.  
  72. #endif // MAINWINDOW_H
To copy to clipboard, switch view to plain text mode 

teste_anim.zip