Python 是否可以使用FillBetweenItem在两个绘图曲线Item'；在pyqtgraph中是什么？

我试图在pyqtgraph中使用PlotCurveItem创建的两条曲线之间填充

            phigh = self.p2.addItem(pg.PlotCurveItem(x, y, pen = 'k'))           
            plow = self.p2.addItem(pg.PlotCurveItem(x, yy, pen = 'k'))           
            pfill = pg.FillBetweenItem(phigh, plow, brush = br)
            self.p2.addItem(pfill)

曲线项目打印正确，但没有填充

这解决了它

            phigh = pg.PlotCurveItem(x, y, pen = 'k')           
            plow = pg.PlotCurveItem(x, yy, pen = 'k')                  
            pfill = pg.FillBetweenItem(ph, plow, brush = br)
            self.p2.addItem(ph)
            self.p2.addItem(plow)
            self.p2.addItem(pfill)