[RQt-devel] an easy way to rotate a layer?

[Michael Lawrence]

I'm pretty sure either (1) you do not have the latest revision or (2) you
need to clean out your source tree, e.g., R CMD INSTALL --preclean.


On Wed, Oct 20, 2010 at 8:50 PM, Yihui Xie <xieyihui at gmail.com> wrote:

> Perfect! Thanks so much!
>
> I didn't find the updateSceneGeometry() method, instead, there are
> update() and updateGeometry() methods which work as well.
>
> BTW, when there are texts in a layer, I will get this warning:
>
> Painter::setTransform: rotating matrices not supported
>
> To reproduce, run the code in this page:
> http://github.com/bigbear/cranvas/wiki/How-to-rotate-a-view
>
> Regards,
> Yihui
> --
> Yihui Xie <xieyihui at gmail.com>
> Phone: 515-294-2465 Web: http://yihui.name
> Department of Statistics, Iowa State University
> 2215 Snedecor Hall, Ames, IA
>
>
>
> On Wed, Oct 20, 2010 at 10:03 PM, Michael Lawrence
> <lawrence.michael at gene.com> wrote:
> > This should be supported now.
> >
> > Qt supports rotations at the view using methods like scale, rotate, etc.
> > Most of the work was supporting this in conjunction with the rescaling
> > performed by our special PlotView class. When using geometry rescale mode
> > (the default, and desirable for your use-case) you'll need to tell the
> > PlotView to update the scene geometry by calling the
> updateSceneGeometry()
> > method.
> >
> > So it's like:
> >
> > v$rotate(90)
> > v$updateSceneGeometry()
> >
> > Michael
> >
> > On Tue, Oct 19, 2010 at 4:15 PM, Michael Lawrence <michafla at gene.com>
> wrote:
> >>
> >> Again, moved this over to qtinterfaces-devel.
> >>
> >> There are basically two transforms involved: one from item (layer) to
> >> scene and one from scene to view (which might be translated by a third
> >> transform to screen coordinates if there is a scrolled viewport). To
> rotate
> >> the entire plot, axes layers included, it's probably best to modify the
> view
> >> transform.
> >>
> >> Unfortunately, the view transform basically must be identity if you're
> >> using the geometry rescale mode in the plot view (the plot view is then
> >> making sure that the plot fits in the viewport by changing the geometry
> of
> >> the layer in the scene). I might be able to improve that if necessary
> >> though. I guess I had not anticipated this use-case. It doesn't make
> sense
> >> to zoom with the geometry rescale mode but rotations might make sense.
> >>
> >> Thanks for this suggestion,
> >> Michael
> >>
> >> On Tue, Oct 19, 2010 at 2:31 PM, Yihui Xie <xieyihui at gmail.com> wrote:
> >>>
> >>> Hi everyone,
> >>>
> >>> I still feel lost in the Qt sea, but I believe it should be very easy
> >>> to rotate a layer by 90 degrees, and I feel it is something like
> >>> qdeviceTransform(), but I just don't know how to use this function.
> >>> Can anyone give me an example? e.g. switch x and y in a scatter plot
> >>> (without really switching the values of x and y)
> >>>
> >>> This can reduce the efforts on considering the direction of a plot,
> >>> being horizontal or vertical; in my par-coords plots, I did this on
> >>> the R level long ago. Maybe that is a waste of time.
> >>>
> >>> Thanks!
> >>>
> >>> Regards,
> >>> Yihui
> >>> --
> >>> Yihui Xie <xieyihui at gmail.com>
> >>> Phone: 515-294-2465 Web: http://yihui.name
> >>> Department of Statistics, Iowa State University
> >>> 2215 Snedecor Hall, Ames, IA
> >>>
> >>> --
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> >>
> >
> >
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