scrollbar for a waveform chart

[kwang305]

Hi, I make the scrollbar visible in the front panel, but it's always gray out as shown below. How can I fix this? Thanks!

[GerdW]

Hi kwang,

switch off x axis autoscaling…

As long as the x axis is autoscaled (and so shows all available data) there is no need for the scrollbar!

[kwang305]

It's not autoscale. The chart only display the most recent data which is 3 minutes and 24 seconds long.

[natasftw]

Is it possible to share your code so we can see what exactly we're working with?

[NIquist · Accepted solution]

Your Chart History property may be too small to display more data than that.  Try setting the X axis scale so it only shows 1 minute of data and your scroll bar will probably work.  If you need more history right click the chart and select Chart History Length...  Change that to a much bigger number.  That number is the number of data points it will buffer.  Its default is 1024 which is pretty small for most uses.

[dkfire]

So how many data point is in this 3:24 minutes?

How large is the chart buffer?

[kwang305]

It worked! I simply set the chart history length to a much larger number, 204800. Thank you so much!