[racket] Plot silently fails for some characters in y-label

I can't replicate this problem on my machine, so I'll need more 
information. Can you run the following program and reply with what you see?


#lang racket

(require racket/draw plot)

(plot (function sin #e1e-157 #e1e-156))

(define bm (make-bitmap 400 400))
(define dc (make-object bitmap-dc% bm))
(send dc set-smoothing 'smoothed)
(send dc set-scale 2 2)
(send dc set-font (make-font #:size (plot-font-size)
                              #:family (plot-font-family)
                              #:size-in-pixels? #t))
(send dc get-text-extent "X (⇑∘C)" #f #t 0)
(send dc draw-text "X (⇑∘C)" 80 180 #t 0 0)
(send dc get-text-extent "Y (∘C)" #f #t 0)
(send dc draw-text "Y (∘C)" 10 120 #t 0 (/ pi 2))
(send dc draw-ellipse 30 30 140 140)
bm


It should produce a simple plot with tick labels on both axes with the 
superscripted exponent "-157", a collection of numbers that looks 
something like this:

110.0
13.5
3.0
0.0
34.0
13.5
3.0
0.0

and a bitmap with a circle and the X and Y axis labels you expect, with 
approximately the placement and orientation you expect them on a plot 
(though bigger).

Neil ⊥

On 04/25/2014 03:39 PM, Deren Dohoda wrote:
> Short story: put a \circ in the y-label and plotting fails?
>
> Racket 6.0 32-bit on 64-bit Windows 7. Using DrRacket. The plot frame is
> generated, the plot title and x-label appear, the tick marks on the axes
> appear, but the y-label doesn't appear and neither (points ...) nor
> (function ...) appear.
>
> Example code (hopefully the extra characters come through email correctly):
>
> #lang racket
> (require plot)
>
> (define (make-p title y-label)
>    (plot (function (λ(x) x))
>          #:x-min 0 #:x-max 50
>          #:y-min 0 #:y-max 50
>          #:x-label "X (⇑∘C)"
>          #:y-label y-label
>          #:title title))
>
> (define-values (works doesnt-work)
>    (values (make-p "Works (⇓∘C)" "Y (C)")
>            (make-p "Doesn't Work (⇓∘C)" "Y (∘C)")))
>
> works
> doesnt-work
> ;;;;;;;;;;;;;;;;;;;;;
>
>
> It's not just arbitrary character substitutions, for instance all the
> \left|right|up|downarrow don't cause any problems, but
> \Down|Up|etc.arrow causes the same problem as \circ. I threw some in the
> title and x-label to show that they didn't cause any failures. I've
> attached an image of what appears in case it helps.
>
> Deren
>
>
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