pyqt5 饼图有标题示例

以下是一个使用 Pyqt5 绘制饼图并添加标题的示例代码：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QGraphicsScene, QGraphicsView
from PyQt5.QtGui import QPainter, QColor, QPen, QBrush, QPainterPath
from PyQt5.QtCore import Qt


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setGeometry(100, 100, 500, 500)
        self.setWindowTitle("Pie Chart with Title")

        self.data = [20, 30, 10, 40]
        self.labels = ["A", "B", "C", "D"]
        self.title = "Pie Chart Example"

        self.scene = QGraphicsScene(self)
        self.view = QGraphicsView(self.scene, self)
        self.view.setGeometry(0, 0, 500, 500)

        self.draw_pie_chart()

    def draw_pie_chart(self):
        total = sum(self.data)
        start_angle = 0
        color_list = [Qt.red, Qt.green, Qt.blue, Qt.yellow]

        for i, value in enumerate(self.data):
            angle = value / total * 360
            path = QPainterPath()
            path.moveTo(250, 250)
            path.arcTo(50, 50, 400, 400, start_angle, angle)
            path.lineTo(250, 250)
            path.closeSubpath()

            brush = QBrush(color_list[i % len(color_list)])
            pen = QPen(Qt.black, 2)
            self.scene.addPath(path, pen, brush)

            start_angle += angle

        self.scene.addText(self.title).setPos(170, 20)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

这段代码会绘制一个带有标题的饼图，并且你可以自己修改数据、标签和标题来绘制自己想要的饼图。