Python 如何在点击鼠标的位置绘制和填充PyQtGraph绘图中的矩形

我正在使用PyQt5和PyQtGraph。我简化了下面的示例代码。然后，每次在单击鼠标的位置单击鼠标时，我想在绘图视图中绘制一个小的红色矩形，从而在绘图视图中累积几个红色矩形。下面的代码有一个#？？？注释，我需要一些代码帮助来绘制红色矩形

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您可以做的是创建一个空散点图项目并将其添加到

self.qPlotWidget

。然后在

mousrClickedEvent

中，您可以将鼠标位置添加到此散点图项目的点列表中，即

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        .... as before ....

        # add empty scatter plot item with a red brush and a square as the symbol to plot widget
        brush = pg.mkBrush(color=(255,0,0))
        self.scatterItem = pg.ScatterPlotItem(pen=None, size=10, brush=brush, symbol='s')
        self.qPlotWidget.addItem(self.scatterItem)


    def mouseClickedEvent(self, event):
        pos = event.scenePos()
        if (self.qPlotWidget.sceneBoundingRect().contains(pos)):
            mousePoint = self.qPlotWidget.plotItem.vb.mapSceneToView(pos)

            # add point to scatter item
            self.scatterItem.addPoints([mousePoint.x()], [mousePoint.y()])

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您可以做的是创建一个空散点图项目并将其添加到

self.qPlotWidget

。然后在

mousrClickedEvent

中，您可以将鼠标位置添加到此散点图项目的点列表中，即

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        .... as before ....

        # add empty scatter plot item with a red brush and a square as the symbol to plot widget
        brush = pg.mkBrush(color=(255,0,0))
        self.scatterItem = pg.ScatterPlotItem(pen=None, size=10, brush=brush, symbol='s')
        self.qPlotWidget.addItem(self.scatterItem)


    def mouseClickedEvent(self, event):
        pos = event.scenePos()
        if (self.qPlotWidget.sceneBoundingRect().contains(pos)):
            mousePoint = self.qPlotWidget.plotItem.vb.mapSceneToView(pos)

            # add point to scatter item
            self.scatterItem.addPoints([mousePoint.x()], [mousePoint.y()])