onWireMouseMove performance

[John Osborne]

I inherited a code base for a large web application which uses the
WireIt libraries to draw organizational relationships. I have been
the main coder on this project for almost a year but I still cannot
solve a very difficult problem.

The performance of the web application is very slow, almost unusable,
for very large org charts. The end user is stuck using IE7 and IE8 so
it makes it even worse.

After profiling the web application and spending some time to learn
more about WireIt I noticed that onWireMouseMove gets called every
time the mouse moves on the layer even if its not near a wire. I have
tried to change that behavior by adding listeners to the wire elements
and removing them from the layer, but no matter what I do the events
fire off on any mouse movement on the layer. From reading the APIs it
seems that was the intent. However, since it has to iteratively go
over each wire for every pixel the mouse crosses and then determine if
there is a wire drawn there its very slow.

When I profile the page now its using about 60% of the processing in
the onWireMouseMove function and its children.

Is there anyway I can change that behavior so that I can have
"mouseover" listeners for the wire elements and not have to listen to
"mousemove" on the layer and then determine if there is a wire there
by iteratively going over every wire?

Thanks very much for your assistance.

[Eric Abouaf]

It's a very ugly code indeed... this is why we should use SVG instead...

I would suggest that you remove that part of the code if you don't need "click" or "mousemove" events on the wires.

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Eric Abouaf
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[John Osborne]

I wish I could move to SVG, but the end user is using IE8 which does
not natively support SVG :-(

On Apr 3, 9:55 am, Eric Abouaf <eric.abo...@gmail.com> wrote:
> It's a very ugly code indeed... this is why we should use SVG instead...
>
> I would suggest that you remove that part of the code if you don't need
> "click" or "mousemove" events on the wires.
>

> eric.abo...@gmail.com

[John Osborne]

By the way I did remove the mousemove events and that did help. Thank
You.

On Apr 3, 9:55 am, Eric Abouaf <eric.abo...@gmail.com> wrote:

> It's a very ugly code indeed... this is why we should use SVG instead...
>
> I would suggest that you remove that part of the code if you don't need
> "click" or "mousemove" events on the wires.
>

> eric.abo...@gmail.com