[Development] matrix math help needed - https://bugreports.qt.io/browse/QTBUG-84441

Dongxu Li dongxuli2011 at gmail.com
Wed May 27 16:54:39 CEST 2020


I think the documentation is actually clear on the order by the scale()
example. I'm not sure whether we should at explicitly the concept of
intrinsic transform:


The current QTransform documentation always states transforming the
coordinate system. Probably, it's supposed to be easier to understand
compared the word "intrinsic".

The order of extrinsic transforms would be exactly the opposite of
intrinsic transforms.



On Wed, May 27, 2020 at 10:09 AM Edward Welbourne <edward.welbourne at qt.io>

> > Here is, for example, the documentation of QTransform::scale:
> >
> >   Scales the coordinate system by sx horizontally and sy vertically,
> >   and returns a reference to the matrix.
> >
> > *Nothing* there clearly states, at least to my reading, whether the
> > "new" transform happens *before* or *after* any existing transforms that
> > the QTransform is already doing.
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Dongxu Li, Ph.D.
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