Quote Originally Posted by scgrant327 View Post
I know it's been a while, but I wanted to update this thread with how I ended up getting this to work best on iOS and Android...

I use the QML charts, and am dynamically updating them by doing a 'remove' followed by and 'append'. I have 4 charts, 3 of which have a single series, and one which has 2 series.

I define the each series at Chart creation, the populate the entire series with data from a MySQL DB... then as new data is added to the DB, I do this for each series ( as appropriate ):

Qt Code: 
  1. series1.remove(0);
  2. series1.append(incomingData.msec,incomingData.dataPoint);
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This removes the first item from the series (the oldest), and appends the newest item as the last in the series... works like a charm.

I was originally destroying and recreating each series... which worked, but this way is cleaner and is less effort.

I would assume that since I can do this via QML, you could do it via C++.

--Sam
Thanks for this post. It was very helpful.
I did similar coding in QML, but has an event with new data coming in.
I append the data to the lineseries during the event, but the chart doesn't get updated.
I also tried remove then append and it doesn't update to the new data.
Was there something else you call to cause the chart to get repaint?

-Qtino