Do not move QGraphicsItem after scaling

[nilot]

Hello,
In my QGraphicsScene I have a QGraphicsItem ( the red rectangle) and a QGraphicsLineItem. I can also change the scale of the view but my QGraphicsLineItem ignores the scale changes : to achieve that I used the following line of code:

myQGraphicsLineItem->setScale(1.0/scaleOfView);

myQGraphicsLineItem->setScale(1.0/scaleOfView);

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So the two items don't have the same scale.
Unfortunately when the scale of the view changes, the relative position of my two items changes ( see the two captures) even if the scene positions of the two items remain the same . Do you understand why ?

Capture2.JPGCapture1.JPG


Thank you

[anda_skoa]

Very likely an issue with the transformation anchor.

When you scale manually you are probably scaling from the center of the item, not from the top left.

Cheers,
_

[nilot]

Hello,
I added this line

myQGraphicsLineItem->setTransformOriginPoint(topLeftPointOfTheLine);

myQGraphicsLineItem->setTransformOriginPoint(topLeftPointOfTheLine);

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and it works well, thank you.