Mouse events

[Alexander Ulyanov]

Hi!

Last week I got curious to figure out if I could control a Sage cell using mouse events. I'm quite a novice in Sage and also have no experience with Javascript. Here is the actual example I was looking at then. Surely it is tempting to be able to just click in the plot to choose a point instead of using the sliders for its coordinates.

Then I found this post and tried the code from there:

@interact
def f0(fun=x*sin(x^2), mousemove='', click='(0,0)'):
    click = sage_eval(click)
    g = plot(fun, (x,0,5), zorder=0) + point(click, color='red', pointsize=100, zorder=10)
    ymax = g.ymax(); ymin = g.ymin()
    m = fun.derivative(x)(x=click[0])
    b =  fun(x=click[0]) - m*click[0]
    g += plot(m*x + b, (click[0]-1,click[0]+1), color='red', zorder=10)

    def h(p):
        f0.mousemove = p
    def c(p):

        f0(click=p)
    show(g, events={'click':c, 'mousemove':h}, svg=True, gridlines='major', ymin=ymin, ymax=ymax)

Prof. Stein ran this fine in Sage cloud. However, the result I now get in Sage cell is:

TypeError: matplotlib() got an unexpected keyword argument 'svg'

The page outside the cell was identical to my example above. Commenting out the svg argument, I get

TypeError: matplotlib() got an unexpected keyword argument 'events'

At this point I'm stuck and looking for help.

[William Stein]

I didn't just run this fine in SageMathCloud. I spent a few days and
reimplementing the entire @interact frontend and backend from scratch
for SageMathCloud, and while I was at it added click support. It's a
different implementation than the one in Sage Cell. It's also
slightly broken right now:
https://github.com/sagemathinc/smc/issues/1459

>
> TypeError: matplotlib() got an unexpected keyword argument 'svg'
>
>
> The page outside the cell was identical to my example above. Commenting out
> the svg argument, I get
>
> TypeError: matplotlib() got an unexpected keyword argument 'events'
>
> At this point I'm stuck and looking for help.
>

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--
William (http://wstein.org)