[vtkusers] Chart question

[David Thompson]

Hi all (but especially Marcus or Eric or those familiar with the new  
charts),

I have a function defined over the entire real line which I would like  
to illustrate using vtkChartXY and a vtkPlotLine instance. However, I  
can't create a dataset to feed vtkPlotLine that specifies the function  
over infinite extents. Instead, when the user pans or scales the plot,  
I'd like to get new axis extents and update the dataset which  
vtkPlotLine uses. Does anyone know a good way to react to pans and  
zooms and retrieve the new axis extents, scaled to dataset coordinates?

	Thanks,
	David