This is dang cool. Yes please submit a PR. 

> On Jan 29, 2018, at 6:09 AM, Alex Harsanyi <alexharsa...@gmail.com> wrote:
> 
> The racket plot package produces interactive snip% objects which allow 
> zooming of the plot area. While this is a cool and sometimes useful feature, 
> the functionality is hard coded in the plot-snip% class inside the package. I 
> would like to extend the package to allow the user to customize the 
> interactive features of the plot -- most of the graphing packages for the web 
> support the display of additional information when the user hovers the mouse 
> over the plot.
> 
> I have built a prototype implementation of adding interactive overlays to 
> plot snips, as shown in the image below, and I would like to ask if there is 
> interest in adding such a feature to the plot package distributed with racket.
> 
> At this point, the code is at a "proof of concept" stage, but ultimately, I 
> will add interactive features to the plots in my application and they will be 
> more complex than just showing the value of a function at a cursor location. 
> As part of that experience, I will better understand what actual features I 
> need, and hope to refine this interface. I am also looking for feedback, in 
> particular if this would be the right approach for doing this.
> 
> The prototype implementation is here: 
> https://github.com/alex-hhh/plot/tree/ah/interactive-overlays
> 
> The code to generate the plot below is here: 
> https://gist.github.com/alex-hhh/64f8af9c4bd5b5c65ada62dd9157e938 
> 
> As it is implemented now, unless a "hover callback" is added to the plot 
> snip, the snip behaves as before, allowing zoom and unzoom when the mouse is 
> dragged over the plot area.
> 
> 
> 
> 
> 
> 
> Best Regards,
> Alex.
> 
> 
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