RFR: 7002: Too large graphs will freeze JMC

[Alex Ciminian]

On Sun, 10 Jan 2021 18:43:47 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Looks good to me. I can try my hand at an icon. :)
>
> I think, perhaps a less on-the-nose-message for when there is no data would be nice. :)

I've changed the empty graph display to a simple label with a small font size. It seems to work ok and doesn't require other changes to the html or javascript �� With this method, it could become very small if the graph view window size is small. Nevertheless, I prefer this way since hacking html/css without touching the javascript is complicated: the SVG fills the page even when we have empty graphs, so I can't just overlay the graph over the text.

It looks like this now:

<img width="1086" alt="Screenshot 2021-01-10 at 20 10 26" src="https://user-images.githubusercontent.com/348973/104134166-e56cd900-537f-11eb-91ef-9b2c121f4bfe.png">

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PR: https://git.openjdk.java.net/jmc/pull/193