haven't looked because I had no reason to use it, but some graphics APIs have a ValueOfPixel() function to get the attributes of an on-screen pixel. Seems of limited use though, since it is assumed that if you put down a pixel in the first place then you should know how you rendered it. FWIW, if your QPainter is rendering to a pixmap/bitmap then you should be able to get the rendered value from that backing.

I have since found out that grabWindow doesn’t work under Wayland. So I either have to find another way or resort to X11 again.

Did you consider using a proxy style ?

Hi @fallouthase,

Please find bellow a simple example using PathAngleArc:

https://doc.qt.io/qt-6/qml-qtquick-pathanglearc.html import QtQuick.Shapes Shape { width: 200 height: 200 anchors.top: parent.top anchors.left: parent.left // Enable multisampled rendering layer.enabled: true layer.samples: 4 // Outer gray arc: ShapePath { fillColor: "transparent" strokeColor: "gray" strokeWidth: 20 capStyle: ShapePath.RoundCap PathAngleArc { centerX: 100; centerY: 100 radiusX: 100-20/2; radiusY: 100-20/2 startAngle: 135 sweepAngle: 270 } } // Inner blue arc: ShapePath { fillColor: "transparent" strokeColor: "blue" strokeWidth: 20 capStyle: ShapePath.RoundCap PathAngleArc { centerX: 100; centerY: 100 radiusX: 100-20/2; radiusY: 100-20/2 startAngle: 135 sweepAngle: 180 } } }

8aa108e1-c336-46a0-a39e-af38847fdfed-image.png

You can also use already implemented customizable QML Circular Slider:

https://github.com/arunpkqt/CircularSlider

Best Regards

First try to for the use of OpenGL.

Otherwise, you will have to build Qt itself.

@firen said in Sync selectionModel between two views where one view has a transposed Model of the other:

That seems ok for my needs

Try inserting/removing rows/columns or sorting and you'll see it will break

@mrjj Thank you for the link and regarding the multiplayer my teacher said that i can do either over the internet or LAN , i believe LAN is a much simplier thing to work with so i'd probably go with that if there are any stuff regarding this topic, for my graduation project it's required for game to be played by ( for example 4 ) players, but each player has to play the game on their own PC.
@jksh ye i wanted to implement that into my game and of course like i said player vs the pc, but my professor said that i should put a multiplayer option in there aswell if i want to get a better grade.

@Jarenward said in Fresh app development:

which Qt is for me?

There is only one Qt :-)
PyQt is a Python binding for Qt and still requires Qt libraries (binaries). So, even if you use PyQt you will need to have Qt libraries which you are using.
If I understood you correctly you need your UI on a computer (not Pi), right? This part is simple - just install the latest stable Qt version an start coding :-)
For the other part you can either directly develop on Pi (using Raspbian you can easily install Qt with apt) or you have to cross compile Qt to develop on your PC. You don't have to cross compile everything, just what you need. See https://wiki.qt.io/Raspberry_Pi_Beginners_Guide

@Ovidiu_GCO
{SQL Server Native Client 17.0 };
What is with the blank in front of "}"

Thanks for the answers, I found the connection problem. I added the part:

void MainWindow::on_connectType_currentIndexChanged(int index)
{
if (modbusDevice) {
modbusDevice->disconnectDevice();
delete modbusDevice;
modbusDevice = nullptr;
}

auto type = static_cast<ModbusConnection> (index); if (type == Serial) { modbusDevice = new QModbusRtuSerialMaster(this); } else if (type == Tcp) { modbusDevice = new QModbusTcpClient(this); if (ui->portEdit->text().isEmpty()) ui->portEdit->setText(QLatin1Literal("127.0.0.1:502")); } connect(modbusDevice, &QModbusClient::errorOccurred, [this](QModbusDevice::Error) { statusBar()->showMessage(modbusDevice->errorString(), 5000); }); if (!modbusDevice) { ui->connectButton->setDisabled(true); if (type == Serial) statusBar()->showMessage(tr("Could not create Modbus master."), 5000); else statusBar()->showMessage(tr("Could not create Modbus client."), 5000); } else { connect(modbusDevice, &QModbusClient::stateChanged, this, &MainWindow::onStateChanged); }

}

And now I can make a connection.

Now I have to test it on the device, but i can't access it for a while, to be continued

@VRonin Excellent! This is exactly what I was looking for! Thank you!

No worries for that :)

Since you have it working now, please mark the thread as solved using the "Topic Tool" button so that other forum users may know a solution has been found :)

@JKSH said in Qt for Beginners is not for Qt 5.5!:

http://doc.qt.io/qt-5/gettingstartedqt.html

FYI
This link: https://doc.qt.io/qt-5/gettingstartedqt.html
now results in a 404 error.
Note: only a slight change: drop the "qt" just before the .html
Try a new link: https://doc.qt.io/qt-5/gettingstarted.html

Now i have better understood the dynamics of connect.

Thanks for your patience.

Then it's just a matter of removing from the list items that are already added. Something like this:

//get the list from somewhere QStringList fileNames = ... //remove the temp item you mentioned fileNames.removeOne(temp); //remove the items already in the widget int numItems = listWidget->count(); for(int i = 0; i < numItems; ++i) fileNames.removeOne(listWidget->item(i)->text()); //now that the list is "clean" all there is left to do is add the new items listWidget->addItems(fileNames);

Welcome to the world of Qt :) Happy coding!

@Chris-Kawa

Thank you very much!

@mcosta Hi,

I'll certainly take a look at it. So I guess it's not only changing the font xD

Thank you.