QDataVisualization

[sauropodbob]

Hi. I am new to Qt and PySide6. I want to understand how QDataVisualization in QML works. I found a sample code on one of the example pages and tried to run it on my local system.

However, when I run the code, a window opens and immediately closes. This only happens with QDataVisualization. Can anyone advise what could be the reason for this? Thank you. The code is shown below

import QtQuick 6
import QtQuick.Controls 6
import QtDataVisualization 1.14
import QtCharts 2.14
import QtQuick.Layouts 1.14
import QtQuick.Window 2.14
import "."

ApplicationWindow {
    title: qsTr("Test")
    width: 1280
    height: 720
    visible: true
    Item {
        width: 640
        height: 480

        Bars3D {
            width: parent.width
            height: parent.height

            Bar3DSeries {
                itemLabelFormat: "@colLabel, @rowLabel: @valueLabel"

                ItemModelBarDataProxy {
                    itemModel: dataModel
                    // Mapping model roles to bar series rows, columns, and values.
                    rowRole: "year"
                    columnRole: "city"
                    valueRole: "expenses"
                }
            }
        }

        ListModel {
            id: dataModel
            ListElement{ year: "2012"; city: "Oulu";     expenses: "4200"; }
            ListElement{ year: "2012"; city: "Rauma";    expenses: "2100"; }
            ListElement{ year: "2012"; city: "Helsinki"; expenses: "7040"; }
            ListElement{ year: "2012"; city: "Tampere";  expenses: "4330"; }
            ListElement{ year: "2013"; city: "Oulu";     expenses: "3960"; }
            ListElement{ year: "2013"; city: "Rauma";    expenses: "1990"; }
            ListElement{ year: "2013"; city: "Helsinki"; expenses: "7230"; }
            ListElement{ year: "2013"; city: "Tampere";  expenses: "4650"; }
        }
    }
}

[sauropodbob]

@SGaist Hi. I am following up on my reply. Thank you

[SGaist]

Hi and welcome to devnet,

Can you also post the python script you use ?
As well as the PySide6 version you installed and how you installed it.

On a side note, please use coding tags for your code to make it properly readable (fixed it for you).

[sauropodbob]

@SGaist Thank you for your response. The PySide6 version is 6.5.0. I installed it using pip. This is the python script

import sys
import os
from pathlib import Path

from PySide6.QtGui import QGuiApplication
from PySide6.QtWidgets import QApplication
from PySide6.QtQml import QQmlApplicationEngine, QmlElement
from PySide6 import QtDataVisualization
from PySide6.QtCore import QObject, Signal, Slot


QML_IMPORT_NAME = "io.qt.textproperties"
QML_IMPORT_MAJOR_VERSION = 1


class Details(QObject):
    def __init__(self):
        super().__init__()


app = QApplication(sys.argv)
engine = QQmlApplicationEngine()

# Get Context
main = Details()
engine.rootContext().setContextProperty("backend", main)


qml_file = Path(__file__).parent / "test_features/testfeature.qml"
engine.load(qml_file)

if not engine.rootObjects():
    sys.exit(-1)

sys.exit(app.exec())

[sauropodbob]

@SGaist Hi. I am following up on my reply. Thank you

[SGaist]

@sauropodbob what happens if you add os.environ["QSG_RHI_BACKEND"] = "opengl" before creating the app object ?

[sauropodbob]

@SGaist Looks like it works now. Thank you

[SGaist]

Since you have it working now please mark the thread as solved using the "Topic Tools" button or the three doted menu beside the answer you deem correct so that the other forum members may know a solution has been found.