[racket-dev] Pre-Release Checklist for v6.0, corrected url

My initial reaction to your message is that this is far too big of a test
case to hand over to someone else. Is there some way we can get you access
to a machine that demonstrates the problem so you can make something
smaller?

Robby

On Monday, December 30, 2013, Neil Toronto wrote:

> I don't think there's anything I can look into. I can't duplicate the
> problem on my system, and Plot doesn't do anything platform-specific, so
> the bug is almost certainly in `pict', `racket/draw' or Cairo. Matthew?
>
> Sorry I wasn't clear on this earlier.
>
> (It could be that it's *possible* duplicate it on my system, and that it
> only shows up on the build machine because the default font is a different
> size, which gives the plot areas slightly different sizes, which gives the
> projected triangles slightly different vertices. I could look into that,
> but it seems unlikely. I use Plot a *lot* and have never seen this before.)
>
> If I were debugging it, I'd try to find the simplest plot that's missing a
> polygon. Here are the bad plots from the docs, rendered the way the docs do
> it (plot to a pict, then convert to a bitmap), with the number of samples
> easy to tweak:
>
> #lang racket
>
> (require pict plot/pict)
>
> (plot3d-samples 41)  ; default is 41
>
> (parameterize ([plot-z-ticks  (currency-ticks)])
>   (pict->bitmap
>    (plot3d-pict (contour-intervals3d (λ (x y) (- (sqr x) (sqr y)))
>                                      -1 1 -1 1
>                                      #:label "z")
>                 #:legend-anchor 'center)))
>
> (pict->bitmap
>  (plot3d-pict (polar3d (λ (θ ρ) 1)
>                        #:color 2
>                        #:line-style 'transparent)
>               #:altitude 25))
>
>
> I'd also try passing #:out-file "out.pdf" to `plot3d-pict' to see if the
> PDF back-end is afflicted.
>
> I don't know how worried to be about missing polygons. It could be
> anything from bad array management in Cairo (which could be serious) to a
> mostly harmless problem in the implementation of region culling or winding
> rules.
>
> Neil ⊥
>
> On 12/29/2013 09:39 PM, Robby Findler wrote:
>
>> Neil: have you had time to look into this? If not, then I think we
>> should just leave it for the next release. Please let us know what
>> you're thinking about this one.
>>
>> Robby
>>
>>
>> On Sat, Dec 21, 2013 at 4:13 PM, Neil Toronto <neil.toronto at gmail.com
>> <mailto:neil.toronto at gmail.com>> wrote:
>>
>>     Some plots in the documentation are missing a polygon. I think it's
>>     platform-specific, because I can't reproduce the problem.
>>
>>     Examples:
>>
>>     First example plot in "1.5 Renderer and Plot Bounds" (look for a
>>     light green rectangle)
>>
>>     file:///usr/racket-5.91.0.900/__doc/plot/intro.html?q=plot#%
>> __28part._.Renderer_and_.Plot_.__Bounds%29
>>
>>
>>     Last example plot in `plot-z-far-ticks' docs (look for a white hole
>>     under the "z" in the legend)
>>
>>     http://plt.eecs.northwestern.__edu/snapshots/current/doc/__
>> plot/ticks_and_transforms.__html?q=plot-z-far-ticks#%__
>> 28def._%28%28lib._plot%2Fmain.__.rkt%29._plot-z-far-ticks%29%__29
>>     <http://plt.eecs.northwestern.edu/snapshots/current/doc/
>> plot/ticks_and_transforms.html?q=plot-z-far-ticks#%
>> 28def._%28%28lib._plot%2Fmain..rkt%29._plot-z-far-ticks%29%29>
>>
>>
>>     Here's a program that renders one of the bad plots like Scribble
>>     does (I think):
>>
>>     #lang racket
>>
>>     (require pict plot/pict)
>>
>>     (pict->bitmap
>>       (plot3d-pict (polar3d (λ (θ ρ) 1) #:color 2 #:line-style
>> 'transparent)
>>                    #:altitude 25))
>>
>>
>>     Neil ⊥
>>
>>
>>     _________________________
>>       Racket Developers list:
>>     http://lists.racket-lang.org/__dev <http://lists.racket-lang.org/dev>
>>
>>
>>
>
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