QPieChart 圖例和百分比 Label

Question

是否可以在 QPieChart 中將百分比顯示為圓圈上的 label 和圖例中的字符串？

這是我的代碼示例

from PyQt5 import QtCore, QtGui, QtWidgets, QtChart
from PyQt5.QtWidgets import QApplication, QMainWindow
import sys
from PyQt5.QtChart import QChart, QChartView, QPieSeries, QPieSlice
from PyQt5.QtGui import QPainter, QPen
from PyQt5.QtCore import Qt

class Window(QMainWindow):
    def __init__(self):
        super().__init__()
 
        self.setWindowTitle("PyQtChart Pie Chart")
        self.setGeometry(100,100, 1280,600)
 
        self.show()
        self.create_piechart()

    def create_piechart(self):
        series = QtChart.QPieSeries()
        series.append("Python", 80)
        series.append("C++", 70)
        series.append("Java", 50)
        series.append("C#", 40)
        series.append("PHP", 30)
        series.setLabelsVisible(True)
        series.setLabelsPosition(QtChart.QPieSlice.LabelOutside)
        for slice in series.slices():
            slice.setLabel("{:.2f}%".format(100 * slice.percentage()))
 
        chart = QChart()
        chart.legend()
        chart.addSeries(series)
        chart.createDefaultAxes()
        chart.setAnimationOptions(QChart.SeriesAnimations)
        chart.setTitle("Pie Chart Example")
 
        chart.legend().setVisible(True)
        chart.legend().setAlignment(Qt.AlignBottom)
        chartview = QChartView(chart)
        chartview.setRenderHint(QPainter.Antialiasing)
 
        self.setCentralWidget(chartview) 
App = QApplication(sys.argv)
window = Window()
sys.exit(App.exec_())

Answer 1

為了在餅圖上顯示百分比，您需要更改QPieSeries 。

將 label position 從
series.setLabelsPosition(QtChart.QPieSlice.LabelOutside)到series.setLabelsPosition(QtChart.QPieSlice.LabelInsideHorizontal)

之后，圖例標簽也是百分比。 要更改圖例標簽，請修改圖例標記

chart.legend().markers(series)[0].setLabel("Python")
chart.legend().markers(series)[1].setLabel("C++")
chart.legend().markers(series)[2].setLabel("Java")
chart.legend().markers(series)[3].setLabel("C#")
chart.legend().markers(series)[4].setLabel("PHP")

鏈接到文檔

完整代碼

from PyQt5 import QtChart
from PyQt5.QtWidgets import QApplication, QMainWindow
import sys
from PyQt5.QtChart import QChart, QChartView
from PyQt5.QtGui import QPainter
from PyQt5.QtCore import Qt


class Window(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("PyQtChart Pie Chart")
        self.setGeometry(100, 100, 1280, 600)

        self.show()
        self.create_piechart()

    def create_piechart(self):
        series = QtChart.QPieSeries()
        series.append("Python", 80)
        series.append("C++", 70)
        series.append("Java", 50)
        series.append("C#", 40)
        series.append("PHP", 30)
        series.setLabelsVisible(True)

    
        series.setLabelsPosition(QtChart.QPieSlice.LabelInsideHorizontal)
        for slice in series.slices():
            slice.setLabel("{:.2f}%".format(100 * slice.percentage()))

        chart = QChart()
        chart.addSeries(series)
        chart.createDefaultAxes()
        chart.setAnimationOptions(QChart.SeriesAnimations)
        chart.setTitle("Pie Chart Example")
        chart.legend().setVisible(True)
        chart.legend().setAlignment(Qt.AlignBottom)

        chart.legend().markers(series)[0].setLabel("Python")
        chart.legend().markers(series)[1].setLabel("C++")
        chart.legend().markers(series)[2].setLabel("Java")
        chart.legend().markers(series)[3].setLabel("C#")
        chart.legend().markers(series)[4].setLabel("PHP")

        chartview = QChartView(chart)
        chartview.setRenderHint(QPainter.Antialiasing)

        self.setCentralWidget(chartview)


    App = QApplication(sys.argv)
    window = Window()
    sys.exit(App.exec_())