QML ChartView updates

[scgrant327]

I am developing a smartphone app (Android & iOS). I have successfully implemented a Chartview and added a lineseries... no problems there...

However, I would like to update the lineseries on-the-fly... as in, I want to remove the first item and append a new item as data comes in (usually every 2 seconds or so).

Any ideas or thoughts on doing that? I've reviewed the docs, but don't readily see a way to handle this.
Thanks!

[anda_skoa]

It seems to have a removeSeries() method: http://doc.qt.io/qt-5/qml-qtcharts-c...eSeries-method

Cheers,
_

[scgrant327]

Good Point.
I'll try using that with adding a new series and see how that will work, although there is no "addSeires"... Maybe 'createSeries' will work.

Will post back with an update...

[scgrant327]

Using removeSeries and createSeries works for Android.
For iOS, I get an error about AbstractSeries being undefined... same source code for both.

[d_stranz]

You probably don't have the include paths set up properly for iOS and it can't find the QML where AbstractSeries is defined.

[scgrant327]

QT and Xcode both compile this project without any issues...and run on my testbed iPhone. Everything works except the Qt Charts on iOS.

[d_stranz]

Compiling is probably not the issue. AFAIK, the QML is loaded at runtime, and your error implies that it can't find the base QML where AbstractSeries is defined. Look at how and where you are deploying the QML files and where your app is expecting them to be.

[scgrant327]

My code:

var wseries = windChart.createSeries(ChartView.SeriesTypeLine, "",axisXw, axisYw);

ios Error:

Error: Unknown method return type: QAbstractSeries*

Thoughts?

[scgrant327]

Anyone have any thoughts?

D_Stranz, can you elaborate on your idea? I've checked everything I can think of, and it appears to be OK... QT Creator and XCode both compile and seem to 'see' all libraries and headers ok...

[d_stranz]

I don't know what to tell you. When you build and run something under Qt Creator, you are running in a different environment than on the actual device (or in a test bed or on your desktop). Paths are different, the "current directory" is different, and so forth. "QAbstractSeries" is probably defined in a QML file associated with the Qt Charts package, and either you aren't deploying that file on iOS or you aren't deploying it in a search path that QML is using on iOS.

On my 5.4.1 distribution, "QAbstractSeries" is defined in the qabstractseries.h file down in the Charts source tree, and is referenced as a Component in the plugins.qmltypes file in the chartsqml2 directory.

Have you followed the instructions on Deploying QML Applications?

[scgrant327]

Seems that the overall issue was running in Debug mode. Once I switched to a Release mode on iOS, the QAbstractSeries error went away... and the charts worked.