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QtWS25 Last Chance

How do QGraphicsView transforms work?

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  • M Offline
    M Offline
    m_p_wilcox
    wrote on last edited by
    #1

    I've been trying to move a view around my scene with translate() as suggested in the docs - it doesn't appear to do anything at all (well if I check the matrix returned by transform() I can see that the call has indeed updated the matrix but my view doesn't move at all).

    I can move about the scene programmatically by setting values for the (hidden) scroll bars.

    Am I misunderstanding the docs, or seeing some sort of bug?

    Mark

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    • M Offline
      M Offline
      m_p_wilcox
      wrote on last edited by
      #2

      Hmmm, just saw this in the bug database:
      http://bugreports.qt.nokia.com/browse/QTBUG-6542

      If it's really the case that translate() doesn't work then perhaps the docs could be updated?

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      • O Offline
        O Offline
        ofmrew
        wrote on last edited by
        #3

        I tried translation and have the same results as m_p_wilcox; has anything been done?

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        • T Offline
          T Offline
          Tengger
          wrote on last edited by
          #4

          You have to

          setTransformationAnchor(QGraphicsView::NoAnchor)
          

          on qGraphicsView for translate() to work.

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