How to adjust too small chart size in QChartview (GUI designed in through QTDesigner)

Question

I have designed a GUI in QTDesigner where I want to include a Doughnut chart using PyQT5's QChart. I have achieved to get the Chart itself visible and hide the legend. However, I have no clue how to make the chart fit the full area of the defined Chartview area. It stays really small as shown in the picture.

Here are the relevant snippets of my code:

from PyQt5 import QtCore,  QtWidgets
from PyQt5.QtChart import QChart, QChartView, QPieSeries
from PyQt5.QtGui import QColor
import csv
from operator import itemgetter


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(1118, 702)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.tabWidget = QtWidgets.QTabWidget(self.centralwidget)
        self.tabWidget.setGeometry(QtCore.QRect(0, 20, 1091, 611))
        self.tabWidget.setObjectName("tabWidget")
    
    # removed a lot of other graphical elements for readability
        
        self.t_type_pressure = QtWidgets.QWidget()              #create a tab which contains a group box
        self.t_type_pressure.setObjectName("t_type_pressure")
        self.groupBox = QtWidgets.QGroupBox(self.t_type_pressure)
        self.groupBox.setGeometry(QtCore.QRect(20, 60, 511, 311))
        self.groupBox.setObjectName("groupBox")
        self.gv_all_types = QChartView(self.groupBox)           #add a QChartView to the group box
        self.gv_all_types.setGeometry(QtCore.QRect(0, 20, 100, 150)) #set the size of the QChartView container which holds the chart
        self.gv_all_types.setObjectName("gv_all_types")
        

        
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        # removed the connections between buttons and functions, one of them called the connectCSVDatabase

    
    def connectCSVDatabase(self):
        # do connection to database here and get data

        # ... get data from CSV file

        # initialize all data containers in GUI
        self.series_all_types = QPieSeries()
        self.series_all_types.setHoleSize(0.45)
        self.series_all_types.setPieSize(1)
        self.series_all_types.append('A', 1).setColor(QColor(0,148,255))
        self.series_all_types.append('B', 1).setColor(QColor(255,144,0))
        self.series_all_types.append('C', 1).setColor(QColor(255,8,0))
        self.series_all_types.hide()


        self.chart_all_types = self.gv_all_types.chart()
        self.chart_all_types.addSeries(self.series_all_types)
        self.chart_all_types.setBackgroundRoundness(0)
        self.chart_all_types.layout().setContentsMargins(1, 1, 1, 1)
        
        self.update_shown_data()

    def update_shown_data(self):
        # clear the existing series and add the new ones
        self.series_all_types.clear()
        self.series_all_types.append('A', 10).setColor(QColor(0,148,255))
        self.series_all_types.append('B', 20).setColor(QColor(255,144,0))
        self.series_all_types.append('C', 30).setColor(QColor(255,8,0))

        self.chart_all_types.addSeries(self.series_all_types)

With the above code my container is clearly visible in the GUI, but the chart itself is really small (see included picture). I hope someone can help me out!

Answer 1

Finally solved this after adding the following line to the code after creating the chart:

self.chart_all_alarms.setPlotArea(QtCore.QRectF(0,0,100,130))

I found the following in the Qt documentation: The plot area does not include the area defined by margins. By default this will resize if inside a QChartView. If an explicit size is set for the plot area then it will respect this