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    <p>I assume that you are using the QGraphicsView framework (it would have been much easier to understand and debug your problem if you posted a minimal, running example program).</p> <p><s>I suggest to use <a href="http://doc.qt.nokia.com/qgraphicswidget.html" rel="nofollow">QGraphicsWidgets</a> and animate their <a href="http://doc.qt.nokia.com/qgraphicswidget.html#geometry-prop" rel="nofollow">"geometry" property</a> directly</s> (EDIT: I was wrong here, this cannot work).</p> <p>You need to simultaniously change the size and position without using two QPropertyAnimations. Most probably the easiest solution will be to <em>subclass</em> a QVariantAnimation (or even QVariantAnimation) and implement <code>updateCurrentValue()</code> appropriately. I think I would interpolate a QRectF from which you extract position and size/scale, otherwise you could of course just interpolate a float (which means you would have even more interpolation code to do yourself, but it gets around having to compute the scale from the size). Consider just marshalling the desired scale into the QRectF’s size (e.g. passing <code>QSizeF(scale, scale)</code> to the constructor). That is a little hackish, because the QRectF is /not/ the desired item geometry anymore, but is otherwise simple and works just great (also with easing curves). Here is a helpful snippet:</p> <pre><code>class GeometryAnimation(QtCore.QVariantAnimation): def __init__(self, item, parent = None): QtCore.QVariantAnimation.__init__(self, parent) self._item = item def updateCurrentValue(self, value): self._item.setPos(value.topLeft()) self._item.setScale(value.width()) </code></pre> <p>Why your current code does not work is hard to say and depends on the implementation of the "slideScale" property; if the transformations interact (which I would consider undesired behavior), that would be the cause.</p>
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    1. POQt animation - Simultaneously change scale and position using QPropertyAnimation
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    1. COHi. Your're correct, I am using the QGraphicsView framework. The slides are QGraphicsPixmapItem and the view is a QGraphicsView. The reason I'm using it instead of widgets is because the qt docs on animation was using it for animating objects and being a newbie at qt I just followed suit. If I were to use QGraphicsWidgets, which class would be appropriate for displaying an image? QLabel? The only class I found when I searched for displaying image was QLabel and QGraphicsPixmapItem but the QLabel is typically used for displaying text, hence I chose the QGraphicsView framework.
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    2. CO(Sorry for the late answer, was on a journey.) You can put your QGraphicsPixmapItem into a QGraphicsWidget (as a child), but I have now tried the solution I suggested myself, and found that it does not work like that: The geometry property is simply not the combination of scale and position, but rather a geometry _relative_ to the pos(), and the content will not scale like with the scale() property.
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    3. COI have now fixed up my answer above and suggested a working solution. ;-)
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