Thanks Ely. I'll make sure I cache it.
I'm trying to improve
performance and I seem to be stuck. In this
case I need to measure the
available height of each series, compare it
to the height of the label, and
then position the label underneath the
datapoint with the most height during
the updateDisplayList method.
Unfortunately, I'm finding that if I want to
measure the height of the
label I have to add it in the createChildren method
rather than the
updateDisplayList method because newly added labels (meaning
added
during the same call to updateDisplayList) return 0 for
both
getExplicitOrMeasuredHeight and getExplicitOrMeasuredWidth. Is
that
to be expected? I think it is, which for me is unfortunate because
it
means that I need to add the label to every single series and
then
remove those that don't fit (which is the case for 95% of the
series).
thanks,
mark
--- In [EMAIL PROTECTED]ups.com,
"Ely Greenfield" <[EMAIL PROTECTED].> wrote:
>
>
>
> Hi Mark. I would make your child creation code cache regardless
of
> circularity reasons, for performance concerns. I don't believe adding
a
> child automatically invalidates your display list. I'm pretty sure
it
> _does_ invalidate measurement, which then _potentially_
invalidates
> display. But the built in series classes won't invalidate
their display
> due to a measurement.
>
> Ely.
>
>
>
>
>
________________________________
>
> From: [EMAIL PROTECTED]ups.com
[mailto:[EMAIL PROTECTED]ups.com]
On
> Behalf Of Mark
> Sent: Thursday, September 14, 2006 9:43
AM
> To: [EMAIL PROTECTED]ups.com
>
Subject: [flexcoders] Re: How can I add a child element to an AreaSeries
>
based on the render data?
>
>
>
> Thanks for your
response Ely. Is there any concern with a circular
> reference? What I
mean is if I call addChild in updateDisplayList
> that will call
invalidateDisplayList, which will ultimately call
> updateDisplayList
again, right? If I make my child creation code
> conditional (so that it
only runs the first time I go through
> updateDisplayList) will that be
enough to avoid the loop?
>
> thanks,
> Mark Haugen
>
> --- In [EMAIL PROTECTED]ups.com
<mailto:flexcoders%40yahoogroups.com>
> , "Ely Greenfield"
<egreenfi@> wrote:
> >
> >
> >
> >
> > Hi Mark. createChildren() is the right place for a compnent
to create
> > 'static' children. But dynamic children...i.e.
children that are
> created
> > or destroyed based on some
runtime information, like amount of data,
> > size on screen,
etc...need to be created elsewhere.
> >
> > In general, I
would reccomend custom components create/destroy dynamic
> > children
in their commitProperties() function. This is because
> >
adding/removing children usually means the component needs to be
> >
re-measured. Doing it in commitProperties means you do it before any
>
> pending measurement happens, and don't end up with unnecessary
extra
> > measurement passes.
> >
> > Charts,
however, don't have a natural measured size. So the various
> > series
types create and destroy their children as necessary in their
> >
updateDisplayList() function. At that point, you can be sure your
data
> > is all up to date.
> >
> > Ely.
>
>
> >
> >
________________________________
> >
> > From:
[EMAIL PROTECTED]ups.com
<mailto:flexcoders%40yahoogroups.com>
> [mailto:[EMAIL PROTECTED]ups.com
<mailto:flexcoders%40yahoogroups.com>
> ] On
> >
Behalf Of Mark
> > Sent: Thursday, September 14, 2006 8:46 AM
>
> To: [EMAIL PROTECTED]ups.com
<mailto:flexcoders%40yahoogroups.com>
> > Subject:
[flexcoders] How can I add a child element to an AreaSeries
> > based
on the render data?
> >
> >
> >
> > I'm
creating an AreaChart that has labels inside each area. Very few
> > of
the series will be large enough to display a label so for
> >
performance reasons I only want to add labels to those that are big
> >
enough. It seems to me that the best place to create and add the
> >
label is in createChildren(), however in examining the renderData,
the
> > filterCache is null and all the bounds values in the cache are
NaN.
> > Where would be the best place to add the label (as far as
performance
> > goes)?
> >
> > Thanks in advance for
any help.
> >
> > Mark Haugen
>
>
>
