[racket] Considering backward-incompatible change to Plot

I use Plot a lot, but pretty much only use `plot-pict` and `plot-file`,
so this change wouldn't affect me.

Not sure how useful that information is to you, but here it is anyway. :)

Vincent



At Tue, 17 Mar 2015 12:33:47 -0400,
Neil Toronto wrote:
> 
> Plot has been converted to Typed Racket in the upcoming Racket 6.2.
> 
> I'm strongly considering taking this opportunity to improve the API. The
> change is backward-incompatible, however, so I need input from those of
> you who use Plot a lot.
> 
> In particular, recent experience with Pict3D makes it clear that the
> type of the `plot` function shouldn't be this:
> 
>   (-> (Treeof (U nonrenderer renderer2d)) ... (U Void (Instance Snip%)))
> 
> but should be this instead:
> 
>   (-> (Treeof (U nonrenderer renderer2d)) ... Plot)
> 
> where a `Plot` instance is a value that can be queried for its
> properties (such as the legend, plot bounds, ticks, etc.) and just
> happens to print in DrRacket as an interactive snip. The type of
> `plot3d` would be changed to return `Plot3D` instances.
> 
> Casual uses wouldn't see any change at all.
> 
> However, functions that receive or return plots, *which also put
> contracts on plots*, would have to change to use `plot?` instead of
> (is-a?/c snip%), or use (require plot/snip), a new compatibility module,
> instead of (require plot).
> 
> How many programs of yours would this change break?
> 
> Any objections? Any suggestions?
> 
> Neil ⊥
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