[RQt-devel] qdrawText() in Qt 4.7.0

[Yihui Xie]

Here comes a minimal example (with screenshots attached):

library(qtpaint)
s <- qscene()
test_layer <- qlayer(s, function(layer, painter) {
    qlineWidth(painter) = 2
    qdrawRect(painter, 10, 10, 90, 90, stroke = 'blue')
    ## origin of y is incorrect (at the top of the canvas; should be
at the center)
    for(y in c(-50,-30,0,30,50)) {
        qdrawText(painter, paste('y =',y), 50,y)
    }
    ## but x is correct
    for(x in c(0,30,50,80,100)) {
        qdrawText(painter, paste('x =',x), x, -60)
    }
}, limits=qrect(0,0,100,100))
qplotView(s)


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 Tue, Oct 19, 2010 at 7:55 AM, Michael Lawrence
<lawrence.michael at gene.com> wrote:
> Moved this over to the more appropriate qtinterfaces-devel list. I am
> installing Qt 4.7 now and will work towards compatibility. For this
> particular issue, it would be helpful if you could send a simple
> reproducible example.
>
> Thanks,
> Michael
>
> On Mon, Oct 18, 2010 at 8:50 AM, Yihui Xie <xieyihui at gmail.com> wrote:
>>
>> Hi (Michael),
>>
>> Last Friday I tried Qt 4.7.0 under Ubuntu 10.10 (installed from
>> Synaptic); everything worked well except the qdrawText() function. See
>> the attachments: it always draws y=0 at the top most of the canvas
>> when I draw the y-axis tickmark labels, while there are no problems
>> with qdrawSegment(). I've spent several hours on this problem but
>> cannot find out the reason...
>>
>> > sessionInfo()
>> R version 2.12.0 (2010-10-15)
>> Platform: x86_64-unknown-linux-gnu (64-bit)
>>
>> locale:
>> [1] en_US.utf8
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>
>> other attached packages:
>> [1] RColorBrewer_1.0-2 plumbr_0.0-1       qtpaint_0.7.11
>>
>> loaded via a namespace (and not attached):
>> [1] qtbase_0.8-7
>>
>> 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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