slow Zoom In/Out in XY Graph

[hellolv]

I am experiencing very slow zoom in/zoom out in XY Graph.  Each action takes roughly 5 seconds.  Is this normal?

The anti-aliased is not On.  I am not using dash lines.

Can someone shed some light here?

[NIquist]

It depends on how many points are in the graph and your PC/Graphics card speeds.  If you're using many plots with a lot of points you may need to decimate the data befoe displaying it.

[hellolv]

When you said many, what is the ballpark we are talking about here?  10,000 points for 3 plots sound many?

[johnsold]

As an approxmation use the number of points plotted equal to the number of pixels in the width of the plot area (for a line plot). If you feed the graph more points than it has pixels to display them, the code internal to the graph has to manipulate that data to determine where to place each pixel. When you drop a new XY graph on the front panel it has 250x250 pixels. When I stretched one to fill my screen I had 1580x862. So X-axis arrays larger than a few hundred to about two thousand elements will result in some data manipulation by the graph.

Lynn

[NIquist]

3 plots of 10,000 points should pose no problem unless your computer is doing something in the background.  Is your graph in a loop that is constantly updating?  Is it still slow when you stop your VI and zoom?  It might be best to post your code.