QGraphicsView画圆弧

可以使用QPainter在QGraphicsView上画圆弧。以下是一个简单的示例代码：

from PyQt5.QtWidgets import QGraphicsView, QGraphicsScene
from PyQt5.QtGui import QPainter, QPen, QColor
from PyQt5.QtCore import Qt, QRectF

class MyGraphicsView(QGraphicsView):
    def __init__(self, parent=None):
        super().__init__(parent)
        
        self.scene = QGraphicsScene(self)
        self.setScene(self.scene)
        
        self.drawArc()
        
    def drawArc(self):
        pen = QPen(QColor(255, 0, 0))
        pen.setWidth(2)
        
        rect = QRectF(50, 50, 200, 200)
        startAngle = 30 * 16
        spanAngle = 120 * 16
        
        painter = QPainter()
        painter.begin(self.scene)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setPen(pen)
        painter.drawArc(rect, startAngle, spanAngle)
        painter.end()

if __name__ == '__main__':
    import sys
    from PyQt5.QtWidgets import QApplication
    
    app = QApplication(sys.argv)
    view = MyGraphicsView()
    view.show()
    sys.exit(app.exec_())

这个示例代码创建了一个QGraphicsView窗口，并在其中画了一个红色的圆弧。你可以根据需要调整圆弧的位置、大小、起始角度和跨越角度。