[flexcoders] strategery help: how to make crosshair on AreaChart

2006-07-11 Thread tddclare 
I have an area chart.  As the user mouses around over it, I'd like a
hirzontal and vertical crosshair (one horiz, one vert gridline, sort
of) to track the mouse pointer.

I see the annotationelements, and am already using it for my
gridlines.  I'm wondering if anyone has ideas of how to implement the
crosshair? 

I'm guessing a canvas that I can use the drawing API on to draw the
lines as the mouseMoves.  But how to tie the position of the mouse
over  JUST the chart area showing the actual data (not over the axes
labels, etc) to the X and Y to draw the lines?  And how to get it to
work in the annotationElements array?

I'm assuming I need to make whatever I create a ChartElement, but I
haven't ever actually cracked open the existing objects and tried to
tie into them at such a low level.

If anyone has any thoughts or guidance, even just for general ways to
get into the source code and create a new class from them, I'd
appreciate it.

Thanks! 






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RE: [flexcoders] strategery help: how to make crosshair on AreaChart

2006-07-11 Thread Ely Greenfield 







http://www.quietlyscheming.com/blog/charts/chart-sampler/

Run the app, and go to the 'custom annotation' sample under 
the 'customization' folder.

Ely.



From: flexcoders@yahoogroups.com 
[mailto:[EMAIL PROTECTED] On Behalf Of tddclareSent: 
Tuesday, July 11, 2006 2:07 PMTo: 
flexcoders@yahoogroups.comSubject: [flexcoders] strategery help: how 
to make crosshair on AreaChart


I have an area chart. As the user mouses around over it, I'd like 
ahirzontal and vertical "crosshair" (one horiz, one vert gridline, 
sortof) to track the mouse pointer.I see the annotationelements, and 
am already using it for mygridlines. I'm wondering if anyone has ideas of 
how to implement thecrosshair? I'm guessing a canvas that I can use 
the drawing API on to draw thelines as the mouseMoves. But how to tie the 
position of the mouseover JUST the chart area showing the actual data (not 
over the axeslabels, etc) to the X and Y to draw the lines? And how to get 
it towork in the annotationElements array?I'm assuming I need to 
make whatever I create a ChartElement, but Ihaven't ever actually cracked 
open the existing objects and tried totie into them at such a low 
level.If anyone has any thoughts or guidance, even just for general ways 
toget into the source code and create a new class from them, 
I'dappreciate it.Thanks! 
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