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POCan't animate QTransform in qgraphicsItem
 

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  1. POCan't animate QTransform in qgraphicsItem
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    <p>I'm trying do some 3D animation in GraphicsScene, for example, to rotate pictures in GraphicsScene (using class, subclassed from <code>qPixmapItem</code> and <code>QObject</code>, if it matters) with Animation framework.</p> <p>Everything works fine, until i want to rotate pictures around vertical axis. There is no way doing so via item.rotate(), so i'm using <code>QTranform</code>.</p> <p>The problem is that doing so does not animate anything at all. What am i doing wrong?</p> <p>P.S. I do not want use OpenGl for this.</p> <p>Here is the way i'm doing it. This way works for animating simpler properties like <code>pos</code>, rotation(via <code>rotation</code>, <code>setRotation</code>) </p> <p>My code :</p> <pre><code>// hybrid graphicsSceneItem, supporting animation class ScenePixmap : public QObject, public QGraphicsPixmapItem { Q_OBJECT Q_PROPERTY(QTransform transform READ transform WRITE setTransform) public: ScenePixmap(const QPixmap &amp;pixmap, QObject* parent = NULL, QGraphicsItem* parentItem = NULL): QObject(parent), QGraphicsPixmapItem(pixmap, parentItem) {} }; </code></pre> <p>Here is how I setup scene and animation:</p> <pre><code>//setup scene //Unrelated stuff, loading pictures, etc. scene = new QGraphicsScene(this); foreach(const QPixmap&amp; image, images) { ScenePixmap* item = new ScenePixmap(image); item-&gt;moveBy(70*i, 0); i++; this-&gt;images.append(item); scene-&gt;addItem(item); } } ui-&gt;graphicsView-&gt;setBackgroundBrush(QBrush(Qt::black, Qt::SolidPattern)); ui-&gt;graphicsView-&gt;setScene(scene); //setup animation QTransform getTransform() { QTransform transform; transform.rotate(-30, Qt::ZAxis);//also tried transform = transform.rotate(...) return transform; } QAbstractAnimation* SetupRotationAnimation(ScenePixmap* pixmapItem) { QPropertyAnimation* animation = new QPropertyAnimation(pixmapItem, "transform"); animation-&gt;setDuration(1400); animation-&gt;setStartValue( pixmapItem-&gt;transform()); animation-&gt;setEndValue(getTransform());//here i tried to multiply with default transform , this does not work either return animation; } </code></pre> <p>here is the way i start animation:</p> <pre><code>void MainWindow::keyPressEvent ( QKeyEvent * event ) { if((event-&gt;modifiers() &amp; Qt::ControlModifier)) { QAnimationGroup* groupAnimation = new QParallelAnimationGroup(); foreach(ScenePixmap* image, images) { groupAnimation-&gt;addAnimation( SetupRotationAnimation(image)); } groupAnimation-&gt;start(QAbstractAnimation::DeleteWhenStopped); } } </code></pre> <p>EDIT[Solved] thx to Darko Maksimovic:</p> <p>Here is the code that worked out for me:</p> <pre><code>QGraphicsRotation* getGraphicRotation() { QGraphicsRotation* transform = new QGraphicsRotation(this); transform-&gt;setAxis(Qt::YAxis); return transform; } QAbstractAnimation* SetupRotationAnimation(ScenePixmap* pixmapItem) { QGraphicsRotation* rotation = getGraphicRotation(); QPropertyAnimation* animation = new QPropertyAnimation(rotation, "angle"); animation-&gt;setDuration(1400); animation-&gt;setStartValue( 0); animation-&gt;setEndValue(45); pixmapItem-&gt;setTransformOriginPoint(pixmapItem-&gt;boundingRect().center()); QList&lt;QGraphicsTransform*&gt; transfromations = pixmapItem-&gt;transformations(); transfromations.append(rotation); pixmapItem-&gt;setTransformations(transfromations); return animation; } </code></pre>
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    1. COWhere are you calling `SetupRotationAnimation`?
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