Re: [Gmod-ajax] Openlazlo

[Michele C. <mc...@br...>]

All right then I'll bite and show my ignorance.

What's a div?

Nice demo though - I like the swoopy zooming.

On May 31, 2007, at 4:15 PM, Mitch Skinner wrote:

> On Thu, 2007-05-31 at 11:13 -0700, Ian Holmes wrote:
>> perhaps a Google Maps-type widget is lurking out there that's
>> exactly what we need (though I doubt any available toolkit can do the
>> scary things that Mitch is currently trying with tracks built  
>> entirely
>> out of DIVs)
>
> I've been experimenting with this over the last few weeks, which is  
> part
> of the reason I've been so quiet lately.  This is still in an  
> extremely
> sketchy state, but there's enough there to get the idea:
> http://genome.biowiki.org/test/divbrowser/genome2.html
>
> The features are exons from D. melanogaster chromosome 3R.  There are
> about 16,000, of which Firefox is able to show a few thousand on my
> hardware before it starts to bog down.  If you zoom out beyond about 3
> megabases the zooming gets to be quite slow, but that's above the  
> point
> where we're currently switching to a feature density histogram for  
> that
> track, anyway.
>
> There's still some low-hanging fruit performance-wise, so I'm  
> optimistic
> that it'll scale to a full set of tracks, especially if we're smart
> about interval search and attaching and detaching things from the DOM.
> And adjusting the threshold where we switch to a density histogram
> should accommodate hardware differences.
>
> The rationale for using divs is:
> 1. reduces server side processing/storage for image tiles
> 2. allows for a nice client-side feature creation/editing UI
> 3. zooming is cool, but it's more than just eye candy--it helps you  
> keep
> an intuitive sense of where you are
> 4. client can cache an entire chromosome worth of features (at  
> least for
> some tracks)--given where firefox and WHAT-WG are going this may  
> enable
> offline use in the future.
> 5. more cross-browser than SVG (I've been testing in firefox and IE  
> 6/7
> and I'll be trying for Safari as well)
>
> Mitch
>
>
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