Chart -UI How to plot multiple lines?

[Tony Contrada]

I have a single Chart-UI control and I want to plot two lines of data. The info says to use a different msg.topic for each input.

I have a Function Node before the chart node which has multiple outputs from the Function Node.

How do I set up the msg.topic in the Function Node in order to plot both data values on the same chart?

Thanks,

Tony

[Juha Autioniemi]

Hi,

You can do for example like this:

ValueToLine1 = Math.round(Math.random()*10*100)/100;

ValueToLine2 = Math.round(Math.random()*10*100)/100;

line1 = { topic: 'line1', payload: ValueToLine1 };

line2 = { topic: 'line2', payload: ValueToLine2 };

  

return [line1, line2]

Juha

[Tony Contrada]

Thanks, exactly what I needed!

I noticed that the Chart-UI control picks it's own colors for the lines. In my case a Dark Blue for Line#1 and a Light Blue for Line#2.

It would be nice to be able to specify the line colors to differentiate them better.

-Tony