I think it is worth having a plot/pict or pict/plot library that doesn't depend on racket/GUI/base (or maybe it would be better to disentangle snips). In any case, we have many others such libraries that turn on avoiding racket/gui/base for exactly this reason.
Robby On Tuesday, October 8, 2013, Neil Toronto wrote: > On 10/08/2013 11:22 AM, Stephen Chang wrote: > >> Short question: >> Is there a way to separate the gui-requiring parts of plot from the >> non-gui-requiring parts? >> >> Long question: >> Many people have expressed pleasant surprise with the plot-evaluating >> ability of the racket pastebin Sam and I are working on. >> >> Most of the effort is due to scribble's nice sandbox evaluation >> capabilities but to get it fully working, I had to hack the plot >> library in my racket install. >> >> The problem is that plot uses racket/gui/base too eagerly but the >> server has no display, resulting in a gtk initialization error. I >> ultimately got around it by just commenting out all the gui parts of >> plot, knowing that it would never get invoked, but obviously this is >> an ugly solution. >> >> I should say that I don't think plot is at fault. The plot library >> does lazy-require racket/gui/base but that's not good enough because >> the laziness has to propagate to other requires that also require >> racket/gui/base (ie plot/snip) which isnt the case. But this cannot >> work anyways because lazy-require only works with functions and some >> of the things imported by plot/snip are classes. >> >> I spent awhile trying to separate the gui-requiring parts of plot but >> was unsuccessful. Maybe the change has to be in racket/gui/base itself >> (related to PR 12465) I don't really know. I guess I'm just looking >> for additional insight. Naively, slideshow/pict and 2htdp/draw do not >> have this problem so it seemed like it should be possible. >> > > Right, racket/gui/base is necessary for snips. In all the documentation > that uses plots (plot, math, images) I've used the following hack when > setting up the evaluators: > > (eval '(require (rename-in (except-in plot plot plot3d) > [plot-pict plot] > [plot3d-pict plot3d]))) > > You could also rename `plot-bitmap' and `plot3d-bitmap'. (The docs use > picts because they look better rendered in a PDF.) It wouldn't be hard to > make a module that does that and provides everything. (Except possibly > `plot-snip', `plot-frame', etc.) > > I'm reluctant to single out one way of rendering when the GUI isn't > available. Picts look nicer when scaled, but bitmaps look nicer when > unscaled (plots are subpixel-rendered in this case). Picts take much more > time to redraw, but for bitmaps it's just a blit. > > Neil ⊥ > > _________________________ > Racket Developers list: > http://lists.racket-lang.org/**dev <http://lists.racket-lang.org/dev> >
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