Hi Doug. I think the devil is in the details. When I look at Google
finance's charts, I see a number of rendering and interaction points
that aren't built in to the existing flex charts. Specifically:
- multiple clickable, labled callout points.
- a hilight point on the line that maps to the current value at the
x-position of the cursor.
- on the top chart:
- inline labels at each year.
- desaturation of the area of the chart outside the filter range
- a slider/scrollbar embedded directly in the data area of the
chart, sized to match the filtered area.
- interactive draggable edges around the filter region.
All of these are integrated additions to the rendering and interaction
behavior of the chart. This type of functionality is best built as chart
extensions, since it's deeply integrated with what the chart does --
display and manipulation of data.
Another approach would be to implement this behavior through external
controls, as you describe below. This is a fine approach, and one that
is a lot easier to implement quickly. Personally, I'm a big fan of
direct manipulation, so I like google's approach. But there's a cost
associated with the deeper integration (namely, implementation cost), so
which approach is right for you really depends on your particular
project's parameters.
(It's worth mentioning that the benefit of building this type of
functionality as extensions on the flex charting platform is that they
could then be pretty broadly reusable across multiple projects and
charts).
Ely.
-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED] On
Behalf Of Doug Lowder
Sent: Tuesday, March 21, 2006 10:39 AM
To: [email protected]
Subject: [flexcoders] Re: Google Finance in AJAX: Can we do this in
Flex?
Hi Ely,
I'm curious about the benefits of implementing these features as chart
extensions as opposed to separate custom components.
Specifically, in my case I have a custom component that can have its
view type set to either chart or datagrid; both use the same
dataprovider. Another custom component has horizontal slider and
scrollbar controls that operate on the dataprovider to allow zoom and
scroll capability. Implementation-wise, there is really nothing in
common between these components. Their parent container incorporates
both the zoom-scroll control and the chart/grid component and sets their
dataproviders to the same object. Do you think this particular use case
would be a good candidate for implementing as chart extensions?
Thanks,
Doug
--- In [email protected], "Ely Greenfield" <[EMAIL PROTECTED]>
wrote:
>
>
>
>
> Hi. In Flex 2, all of this functionality could be implemented as
chart
> extensions. Building on different codebases makes it easier or
harder
> to do some specific things, so an implementaiton using flex would
> probably be different in subtle ways, but yes, in general, you
could
> build this as chart extensions.
>
> Ely.
>
>
> -----Original Message-----
> From: [email protected]
[mailto:[EMAIL PROTECTED] On
> Behalf Of t_msreddy
> Sent: Tuesday, March 21, 2006 8:49 AM
> To: [email protected]
> Subject: [flexcoders] Google Finance in AJAX: Can we do this in
Flex?
>
> I just learnt about Google Finance. I think they implemented in
AJAX
>
> URL:
> http://finance.google.com/finance?q=MSFT&btnG=Search
>
> I was particularly pleased with the sliding bar at the top of the
chart
> used for zoom in/out. Can this be done in Flex? I know there is a
> SlideBar component in Flex which can do that. But it is limited:
>
> 1. SlideBar component has only one movable sliding tip. In the
google
> chart that you see, there are two movable sliding tips.
> 2. SlideBar component can be used to filter data based on only one
point
> lets say 2004. In google finance chart, there is a movable sliding
> window apart from movable adjustable tips say between 2004 and
> 2006
>
> How can we implement such a think in Flex?
>
>
>
>
>
>
> --
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