python - PyQt 对话框中的 matplotlib 十字光标不显示

Question

我希望在我的 matplotlib 窗口中的光标处有一个十字准线。这在 matplotlib gallery 中给出的示例中得到了解决。 。但不幸的是，如果我在 Qt 对话框窗口 (QDialog) 中有 matplotlib 小部件，它就不起作用。

这是我的代码示例，我想在其中实例化 matplotlib.widgets.Cursor 对象，但没有显示任何内容。

import sys
from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
import matplotlib.pyplot as plt
from matplotlib.widgets import Cursor

class Window(QtGui.QDialog):
    def __init__(self, parent=None):
        super(Window, self).__init__(parent)
        self.figure = plt.figure(facecolor='white')
        self.canvas = FigureCanvas(self.figure)
        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.canvas)
        self.setLayout(layout)

        ''' plot some random stuff '''
        ax = self.figure.add_subplot(111)
        self.ax = ax
        ax.plot([1,2])

        # Set cursor        
        Cursor(self.ax, useblit=False, color='red', linewidth=1)
        self.canvas.draw()

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    main = Window()
    main.show()
    sys.exit(app.exec_())

有人可以帮忙吗？

Answer 1

我已按如下方式修改了您的代码，它可以在我的计算机上运行。希望对您有所帮助。

import sys
from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
import matplotlib.pyplot as plt
from matplotlib.widgets import Cursor

class Window(QtGui.QDialog):
    def __init__(self, parent=None):
        super(Window, self).__init__(parent)
        self.figure = plt.figure(facecolor='white')
        self.canvas = FigureCanvas(self.figure)
        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.canvas)
        self.setLayout(layout)

        ''' plot some random stuff '''
        ax = self.figure.add_subplot(111)
        self.ax = ax
        ax.plot([1,2])
        # Set cursor        
        cursor = Cursor(self.ax, useblit=False, color='red', linewidth=1)

        ############## The added part: #############
        def onclick(event):
            cursor.onmove(event)
        self.canvas.mpl_connect('button_press_event', onclick)
        ############################################
        self.canvas.draw()

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    main = Window()
    main.show()
    sys.exit(app.exec_())