draw_svg option to suppress site/mutation rendering

[jeromekelleher]

When working with large data trees we often want to do a quick viz of a subset of the nodes. However, when we have thousands of sites and mutations on it, it takes ages and we can't really see the tree.

Is there an easy way to supress sites and mutations? Can we add an option to stop them getting added to the SVG?

Ping @hyanwong

[benjeffery]

I guess you just clear the tables? But would be nice to have some syntatic sugar for that.

[jeromekelleher]

It's bit tedious having to dump the tables and create a new ts. For quick exploratory stuff I'd like to do:

big_ts.simplify(big_ts.samples()[:10]).draw_svg(suppress_sites=True)

[hyanwong]

If it's the viz that's slow (rather than the generation) you could hide them with CSS (style=".mut, .site: display:None") and provide syntactic sugar for that instead. But if could be that makes a huge and unwieldy SVG.

[jeromekelleher]

It'll be massive - we're talking about 10s of thousands of sites here.

[hyanwong]

Yeah, an option to omit them seems sensible.

[jeromekelleher]

Are you happy to pick this one up for the next release @hyanwong?

[hyanwong]

Yep, fine.