[racket] FIXED Re: Setting font for drawing to dc%

It looks like unpack-submission creates only text% objects, not
text:racket% objects. But I think you can iterate over the snips in
teh editor (find-first-snip method on the text% and next on teh snip%)
and use the copy method of the snip to create new ones to insert into
a text:racket% object. Then if you just call freeze-colorer, you'll
get the fixed width font (without explicitly setting the style) and
you'll get the syntax highlighting.

Robby

On Fri, Dec 7, 2012 at 3:14 PM, Jordan Johnson <jmj at fellowhuman.com> wrote:
> Hi Robby, Matthew,
>
> Thanks for the replies.  Robby, that was exactly what I needed, since I hadn't thought to look at the text% hierarchy recently for style changes.  (Even knowing that, it took a while to work it out; owing to my not having a full understanding of what triggers a reload of files the checker depends on, I didn't get the version below to work until I manually restarted the server. But it's all good now.  Also of interest: I learned that even if I set the style correctly as below, if I subsequently set the font to fixed-width in the dc as I'd erroneously been doing, the text reverted to the non-fixed sans serif.  That was surprising!)
>
> Here is my corrected, working code:
>
> #lang s-exp handin-server/checker
>
> (require racket/gui/base racket/class  ;; for PDF rendering
>          racket/draw)
>
>
> (define fixed-width
>   (send (new style-delta%) set-delta 'change-family 'modern))
>
> ;; make-pdf : String text% -> any
> ;; Generates a PDF of the given Definitions window, saved in
> ;; /tmp/test-pdf-writing.pdf:
> (define (make-pdf file defs)
>   (define dc (new pdf-dc%
>                   [interactive #f]
>                   [output "/tmp/test-pdf-writing.pdf"]))
>   (send defs select-all)
>   (send defs change-style fixed-width)
>   (send dc start-doc "")
>   (send defs print-to-dc dc -1)
>   (send dc end-doc))
>
> (check: :language '(special beginner)
>         :textualize? #t
>         (define user-string
>           (if (list? users) (apply string-append users) users))
>         (define-values (defs ints) (unpack-submission submission))
>         (make-pdf user-string defs))
>
> ;; end
>
> I suppose there are two remaining questions: does freeze-colorer need to be called even if the text% in question is not displayed, and where is the latest it can be called in the sequence above?
>
> Best,
> Jordan
>
> On Dec 7, 2012, at 4:21 AM, Robby Findler <robby at eecs.northwestern.edu> wrote:
>
>> Code would help understand, but setting the font in the dc isn't the
>> way to go: you want the styles to be right (which is what racket:text%
>> does). And you'd need to call freeze-colorer to wait for the coloring
>> to finish, too, but that would affect only the colors, not the fonts.
>>
>> Robby
>>
>> On Fri, Dec 7, 2012 at 5:56 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
>>> I'm not sure. Can you provide a small program that illustrates the problem?
>>>
>>> At Fri, 7 Dec 2012 00:26:47 -0800, Jordan Johnson wrote:
>>>> Hi all,
>>>>
>>>> I was delighted to find awhile back that it's pretty easy to obtain a PDF of
>>>> syntax-colored code that looks more or less like what I see in my DrRacket
>>>> window, by drawing the text% to a PDF-dc%.  I am now using that in conjunction
>>>> with the handin server to grade and mark up student work on my iPad (annotating
>>>> the PDFs via GoodReader and emailing them straight back to students), and it
>>>> works beautifully. (I am happy to share the code for this with anyone who is
>>>> interested; email me if so.)
>>>>
>>>> One glitch: I can't get Racket to give me a fixed-width font in the PDF.  I
>>>> have tried inserting
>>>>  (send dc set-font (make-object font% 12 'modern))
>>>> where dc is my pdf-dc%, and alternately
>>>>  (send dc set-font (send the-font-list find-or-create-font 12 'modern 'normal
>>>> 'normal))
>>>> but in both cases the generated PDF is still in a sans-serif non-fixed-width
>>>> font.  It does not seem to matter whether I put the above lines before or after
>>>> the
>>>>  (send dc start-doc "")
>>>> that begins the drawing process.
>>>>
>>>> Interestingly, in a test I ran just now, if I generate a PDF by directly
>>>> creating a racket:text% object, putting some Racket program text in it, and
>>>> calling the same make-PDF function I use in the handin-server (calling set-font
>>>> using the-font-list, as described above), it gives me fixed-width text as I'd
>>>> expect.  That's regardless of whether I set the font before or after the
>>>> start-doc command. (racket:text% is just a guess at the text% subclass that the
>>>> handin server is providing, based on it being a representation of the
>>>> Definitions window.)
>>>>
>>>> Any ideas how to solve this, or further tests I could run to determine the
>>>> cause?
>>>>
>>>> Thanks for your consideration,
>>>> Jordan
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