从pyqtgraph返回鼠标单击坐标作为列表

如何解决从pyqtgraph返回鼠标单击坐标作为列表

我对pyqtgraph相当陌生，并且已经学习python一段时间了。我正在尝试从pyqtgraph plotitem获取鼠标单击坐标。这就是我到目前为止所拥有的。

class CrossHair():
    def __init__(self,win,row=0,col=0):
        self.label = pg.LabelItem(justify='right')
        self.p1 = win.getItem(row=row,col=col)
        self.p1.setAutoVisible(x=True,y=True)
        win.addItem(self.label,row=row,col=col)
        self.vLine = pg.InfiniteLine(angle=90,movable=False)
        self.hLine = pg.InfiniteLine(angle=0,movable=False)
        self.vb = self.p1.vb
        self.p1.addItem(self.vLine,ignoreBounds=True)
        self.p1.addItem(self.hLine,ignoreBounds=True)
        self.proxy = pg.SignalProxy(self.p1.scene().sigMouseMoved,rateLimit=60,slot=self.mouseMoved)
        self.p1.scene().sigMouseClicked.connect(self.mouseClicked)
        #self.p1.scene().sigMouseMoved.connect(self.mouseMoved)
    def mouseMoved(self,evt):
        pos = evt[0]  ## using signal proxy turns original arguments into a tuple
        if self.p1.sceneBoundingRect().contains(pos):
            mousePoint = self.vb.mapScenetoView(pos)
            self.label.setText("<span style='font-size: 10pt'>x=%0.1f,<span style='color: red'>y=%0.1f</span>"%(mousePoint.x(),mousePoint.y()))
            self.vLine.setPos(mousePoint.x())
            self.hLine.setPos(mousePoint.y())
    def mouseClicked(self,event):
        global mouse_coordinates
        mouse_coordinates=[]
        pos = event.scenePos()
        mousePoint = self.vb.mapScenetoView(pos)
        mouse_coordinates = [mousePoint.x(),mousePoint.y()]
        return mouse_coordinates
        #self.sigMouseClicked.disconnect()

我想定义一个函数get_points(win)，该函数将使用当前的pyqtgraph窗口，绘制一个十字准线，并且每当我单击时，都将返回鼠标单击坐标的列表。单击一次后，除非再次调用该函数，否则我不希望它再注册任何坐标。

我写了这样的东西，但是没用：

def get_points(win):
    ch = CrossHair(win)
    ch.p1.scene().sigMouseClicked.connect(ch.mouseClicked)

任何帮助或建议，我们将不胜感激！