QScatterSeries was not declared in this scope?

[engsml]

My code is as follows where I am trying to instantiate a QScatterSeries in my class:

QScatterSeries* series = new QScatterSeries;
series->append(0,2);
series->append(4,10);

I have included the following headers in the class:
#include "qlineseries.h"
#include <QScatterSeries>
#include <QtCharts/QScatterSeries>

The documentation states to declare the header for QScatterSeries like #include <QScatterSeries>.

I have also included QT += charts in my .pro file.

I get the following 3 errors:
QScatterSeries was not declared in this scope
'series' was not declared in this scope
'QScatterSeries' does not name a type.

I am new to Qt and am confused as to why the code won't recognize the header files. I had previously done a project where I used a QLineSeries and instantiated it the same way and it worked. Any help is much appreciated!

[mrjj]

@engsml
Hi
Run qmake manually after adding QT += charts to .pro file
Then it should be ok.
( it will show it know the headers)
Deleting the build folder also does it.

[engsml]

@mrjj Thank you for your response. I added the QT += charts to the .pro file like this:

QT += widgets
QT += charts

and ran the qmake file. The qmake file ran successfully but the same errors come up when I run it. Is there an error in how I am writing the .pro file?

Also, what is the significance of building the qmake file?

[mrjj]

@engsml
Hi
And you did install QChats ?
( its extra in the installer )

You seem to done it right.
And normally just running Qmake 1 time will fix it.

also
does any of the
https://doc.qt.io/qt-5/qtcharts-examples.html
work ?

[Gojir4]

@engsml Hi, Did you add using namespace QtCharts; at start of your code ?

[engsml]

@Gojir4 This worked! Thank you so much!

[engsml]

@mrjj Yes the examples worked when I ran them on my Qt Creator IDE. That was why I was confused because I was copying what their code had, but mine wasn't working even though the examples would run perfectly. @Gojir4 's solution worked for me though, but I am really not sure why!

[mrjj]

@engsml
using namespace QtCharts
just means you dont have to use it in front
like
QtCharts::XXX
but can just use
XXX directly.
Im not sure why either :)

But it must mean that the full type signature is
QtCharts::QScatterSeries
and that was what it complained about.

[engsml]

@mrjj Very interesting. I'll keep that in mind for the future. Thank you so much again for your help!!

[mrjj]

@engsml
no problem.
Its normal c++ so
its applies to anything in namespaces.