[RQt-devel] scale of view for some primitive doesn't work

[Tengfei Yin]

On Thu, Nov 11, 2010 at 10:27 PM, Michael Lawrence <
lawrence.michael at gene.com> wrote:

>
>
> On Thu, Nov 11, 2010 at 7:32 PM, Tengfei Yin <yintengfei at gmail.com> wrote:
>
>> So even when you use view$rotate(), the text direction won't change..is
>> this also what we expected to see?
>>
>>
> Yes. I can see how that may not always be desirable, but it would be tough
> to work around it. That is, I cannot tease out the rotation from the rest of
> the transformation. In the case of a word cloud, I think it would be
> desirable, i.e., one is thinking of the text as glyphs that are independent
> of the scales.
>
>
>> and by the way, do you know any way to change to text size, the use case
>> here is sth like "tag cloud", but I guess I can draw text as path to solve
>> this problem.
>>
>>
> Just change the font.. do you want some sort of vectorized "cex" argument
> to qdrawText? Might not be that hard to add.
>

Yes, if you don't mind spend some time on it, it will be really nice to have
a control over the text size, e.g. when I plot a sequence data, like
ACTGGGC....I can resize one single character  to address the mis-alignment.

>
> Michael
>
>
>>
>> On Thu, Nov 11, 2010 at 6:14 PM, Tengfei Yin <yintengfei at gmail.com>wrote:
>>
>>>
>>>
>>> On Thu, Nov 11, 2010 at 5:39 PM, Michael Lawrence <
>>> lawrence.michael at gene.com> wrote:
>>>
>>>> This is by design. If this didn't work that way, then when the user
>>>> zoomed into a chromosome, for example, the text labels would get really
>>>> stretched out. Glyphs are the same way (they're essentially fancy
>>>> characters). Zooming into a scatterplot should not make the glyphs larger.
>>>> Circles (after much debate inside my head) behave the same as glyphs. This
>>>> is because their radius, like in a bubble plot, is derived from something
>>>> other than the X and Y axes.
>>>>
>>>> Shapes however, like rectangles, polygons and paths, are zoomed. You
>>>> expect a mosaic plot rectangle or a map polygon to scale with the plot.
>>>>
>>>>
>>> This make sense to me, in most cases, i guess people won't expect the
>>> circle or text to be  zoomed in.
>>>
>>> Are you sure you really need the text to scale with the zoom? Deepayan
>>>> and I decided a long time ago that zooming does not behave like a
>>>> "magnifying glass." It rescales the plot.
>>>>
>>>>
>>> No, you don't have to change that, it's convenient so far, I am just
>>> curious why this doesn't work for text and circle, because in other rare
>>> case, I will draw very small text as labels of axis for one circular track,
>>> or if I draw points around the circular track, I am still expecting the
>>> points will be zoomed in when I rescale the view. I guess I am confused the
>>> "rescale of the view" with the one you defined with Deepayan, but it make
>>> sense to me.
>>>
>>> There are some ways to get around this if you really want to:
>>>> - Draw the text as a path.
>>>> - Use the "render" method on the scene to render to a QPicture, rescale
>>>> that and display it. This is how I imagined someone making a magnifying
>>>> glass. QPicture is a vectorized representation, so no nasty scaling
>>>> artifacts are introduced.
>>>>
>>>
>>> Thanks, I think I need to do it in this way, if I really need them to be
>>> rescaled.  I never try QPicture before, I will take a look at it.
>>>
>>>
>>>> Michael
>>>>
>>>> On Thu, Nov 11, 2010 at 3:24 PM, Tengfei Yin <yintengfei at gmail.com>wrote:
>>>>
>>>>> Hi
>>>>>
>>>>> Here comes another question with text, please see the attached  code
>>>>> below, only rect could be resized,  when I call v$scale()
>>>>>
>>>>> text, circle doesn't change. it happens to visnab, the circular view,
>>>>> when I scale the view, every thing resize but the text, it's still in the
>>>>> same size.
>>>>>
>>>>> library(qtpaint)
>>>>> s <- qscene()
>>>>> test_layer <- qlayer(s,function(layer,painter){
>>>>>   qdrawRect(painter,30,30,70,70,stroke="blue")
>>>>>   qdrawCircle(painter,50,50,20,stroke="red")
>>>>>   qdrawText(painter,"TEST",50,50)
>>>>> },limits=qrect(0,0,100,100))
>>>>> v <- qplotView(s)
>>>>> v$show()
>>>>>
>>>>> v$scale(1.5,1.5)
>>>>>
>>>>> Thanks
>>>>>
>>>>> Tengfei
>>>>> --
>>>>> Tengfei Yin
>>>>> MCDB PhD student
>>>>> 1620 Howe Hall, 2274,
>>>>> Iowa State University
>>>>> Ames, IA,50011-2274
>>>>> Homepage: www.tengfei.name
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Qtinterfaces-devel mailing list
>>>>> Qtinterfaces-devel at lists.r-forge.r-project.org
>>>>>
>>>>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/qtinterfaces-devel
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> Tengfei Yin
>>> MCDB PhD student
>>> 1620 Howe Hall, 2274,
>>> Iowa State University
>>> Ames, IA,50011-2274
>>> Homepage: www.tengfei.name
>>>
>>>
>>>
>>
>>
>> --
>> Tengfei Yin
>> MCDB PhD student
>> 1620 Howe Hall, 2274,
>> Iowa State University
>> Ames, IA,50011-2274
>> Homepage: www.tengfei.name
>>
>>
>>
>> _______________________________________________
>> Qtinterfaces-devel mailing list
>> Qtinterfaces-devel at lists.r-forge.r-project.org
>>
>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/qtinterfaces-devel
>>
>>
>


-- 
Tengfei Yin
MCDB PhD student
1620 Howe Hall, 2274,
Iowa State University
Ames, IA,50011-2274
Homepage: www.tengfei.name
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