如何解决如何在 QtChart 中更改 QPieSlice 的标签大小
我尝试使用 slice.setLabelFont(font) 但它不起作用, 我在下面附上了我的代码
class MainWindow(QtWidgets.QMainWindow):
def __init__(self,*args,**kwargs):
super(MainWindow,self).__init__(*args,**kwargs)
#Load the UI Page
THIS_FOLDER = os.path.dirname(os.path.abspath(__file__))
my_file = os.path.join(THIS_FOLDER,'main.ui')
uic.loadUi(my_file,self)
# changing the background color to cyan
self.setStyleSheet("background-color: #363636;")
# set the title
self.setwindowTitle("Screen Time")
# self.graphWidget = pg.PlotWidget()
# self.setCentralWidget(self.graphWidget)
font=QtGui.QFont()
font.setPixelSize(20)
font.setPointSize(20)
series = QtChart.QPieSeries()
series.setHoleSize(0.5)
series.append("Example1 40%",40.0)
slice = QtChart.QPieSlice()
slice.setLabelFont(font)
slice = series.append("Example1 30%",30.0)
slice.setLabelVisible()
series.append("Example1 30%",30.0)
chart = QtChart.QChart()
chart.addSeries(series)
chart.setTitleFont(font)
chart.setTitle('usage time')
chart.setAnimationoptions(QtChart.QChart.SeriesAnimations)
chart.setTheme(QtChart.QChart.ChartThemeDark)
#chart.animation
chart.setBackgroundBrush(QtGui.QBrush(QtGui.QColor("transparent")))
chart.legend().setVisible(True)
chartview = QtChart.QChartView(chart)
chartview.setRenderHint(QtGui.QPainter.Antialiasing)
self.chart_container.setStyleSheet("background-color: #363636;")
self.chart_container.setContentsMargins(0,0)
lay = QtWidgets.QHBoxLayout(self.chart_container)
lay.setContentsMargins(0,0)
lay.addWidget(chartview)
解决方法
有两个问题。首先,您在从未添加到 QPieSeries 的 QPieSlice 上调用 setLabelFont
。
slice = QtChart.QPieSlice() # this is never added to the series
slice.setLabelFont(font)
slice = series.append("Example1 30%",30.0) # creates and returns a new pie slice
slice.setLabelVisible()
其次,将图表主题设置为QChart.ChartThemeDark
会将字体改回默认值,因此必须在 QPieSlice 标签字体之前设置。如docs中所述:
更改主题将覆盖之前应用于该系列的所有自定义设置。
class MainWindow(QtWidgets.QMainWindow):
def __init__(self,*args,**kwargs):
super(MainWindow,self).__init__(*args,**kwargs)
#Load the UI Page
THIS_FOLDER = os.path.dirname(os.path.abspath(__file__))
my_file = os.path.join(THIS_FOLDER,'main.ui')
uic.loadUi(my_file,self)
self.setStyleSheet("background-color: #363636;")
self.setWindowTitle("Screen Time")
chart = QtChart.QChart()
chart.setTheme(QtChart.QChart.ChartThemeDark)
font=QtGui.QFont()
font.setPixelSize(20)
font.setPointSize(20)
series = QtChart.QPieSeries()
series.setHoleSize(0.5)
series.append("Example1 40%",40.0)
slice = series.append("Example1 30%",30.0)
slice.setLabelVisible()
slice.setLabelFont(font)
series.append("Example1 30%",30.0)
chart.addSeries(series)
chart.setTitleFont(font)
chart.setTitle('usage time')
chart.setAnimationOptions(QtChart.QChart.SeriesAnimations)
chart.setBackgroundBrush(QtGui.QBrush(QtGui.QColor("transparent")))
chart.legend().setVisible(True)
chartview = QtChart.QChartView(chart)
chartview.setRenderHint(QtGui.QPainter.Antialiasing)
self.chart_container.setStyleSheet("background-color: #363636;")
self.chart_container.setContentsMargins(0,0)
lay = QtWidgets.QHBoxLayout(self.chart_container)
lay.setContentsMargins(0,0)
lay.addWidget(chartview)
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