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.toro...@gmail.com >> <mailto:neil.toro...@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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