Can I add a second plot to an XY graph without having to re-draw the first?

Hi,
I'm trying to figure out a way to add a second plot (a linear fit between 2 cursors) to an XY graph without having to redraw the first plot (the underlying data). The reason this is important is that the first plot is typically hundreds of thousands of data points (or more), and it is slow to redraw. I would like the user to be able to move cursors around and dynamically do a linear fit to the underlying data in the range between the two cursors, with the line being drawn as the second plot.
My current program just wires both plots to the graph and re-draws both. This ends up being quite slow.
Ken

Here's a quick draft how you could draw the regression line (LabVIEW 8.2). Modify as needed.
Message Edited by altenbach on 10-28-2007 12:51 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
DrawRegression.png ‏28 KB
PlotLine.vi ‏46 KB

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