Qt position of item in scene at different scales

Asked Jan 12 '17 at 00:22

Active Jan 12 '17 at 00:22

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This question is regarding Qt's GraphicsViewFramework.

I have two QGraphicsItems of the same type, A and B seen here. I have set both objects to ignore parent transformation,

B is a child of A, so when I move A so does B. and as you see in the picture the position of B is (-300, -300) because that value is relative to it's parent position. But the scenePosition is displaying correctly to (0,0) as expected.

When I zoom in the scene, things get weird. Since B is a child of A, it exists in A's coordinate system so it will maintain it's position relative to A. see picture.

As you can see the position of B in the view seems shifted. I wan't to find the relative position of B in the current zoom level. How can I achieve this?

asked Jan 12 '17 at 00:22

ArmenB

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this seems to be a similar issue http://stackoverflow.com/questions/11459318/maintaining-relative-child-position-after-applying-qgraphicsitemitemignorestra – lena Jan 12 '17 at 06:55
Thanks I saw that before posting, but this is different. – ArmenB Jan 12 '17 at 18:03
Then maybe you would add some code? I tried to reproduce this scene but it was ok, no shifts – lena Jan 12 '17 at 19:17
When you created B, did you set A to be it's parent? – ArmenB Jan 12 '17 at 20:20
Yes, with setParentItem – lena Jan 13 '17 at 04:18

Qt position of item in scene at different scales

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