<br><br><div class="gmail_quote">On Fri, Sep 17, 2010 at 4:39 AM, Deepayan Sarkar <span dir="ltr"><<a href="mailto:deepayan.sarkar@gmail.com">deepayan.sarkar@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi,<br>
<br>
A couple of low-priority things that might be nice to have:<br>
<br>
(1) In dealing with images, Qt used unsigned int for colors.<br>
<br>
> qimg <- Qt$QImage(100, 100, Qt$QImage$Format_ARGB32_Premultiplied)<br>
> qimg$fill(0L)<br>
> qimg$pixel(40, 50)<br>
[1] 0<br>
<br>
Is there an easy way to implement conversion to/from R colors? (Maybe<br>
through R color <-> R integer <-> unsigned int.)<br>
<br></blockquote><div><br>For images, I was thinking we could have a converter between QImage and R images stored as matrices (as used by graphics devices in recent versions of R). Any pixel-wise manipulation of images from R would be too slow in general.<br>
<br>Btw, there is already conversion between QColor and the output of col2rgb(), using qcol2rgb() and qcolor().<br><br> </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
(2) QByteArrays are almost like strings, and used in various places. E.g.,<br>
<br>
> Qt$QImageReader$supportedImageFormats()<br>
Error in qinvokeStatic(cl, name, ...) :<br>
Attempt to create SmokeObject with NULL class<br>
> Qt$QByteArray()<br>
NULL<br>
<br>
Is there a risk in allowing the conversion?<br></blockquote><div><br><br>The above looks like a bug. QByteArray is supposed to be converted to a raw vector (closest R equivalent in my opinion, as QByteArray has no notion of locale, etc), which is then easily converted to a string if necessary with rawToChar(). <br>
<br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
-Deepayan<br>
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