我正在尝试选择并显示在wxPython中嵌入的matplotlib中某一点的数据。我编写了一个最小示例来绘制随机数据，代码如下。
import numpy as np
import wx
from matplotlib.figure import Figure
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
class PlotGUI(wx.Frame):
"""Class to display basic GUI elements."""
def __init__(self, parent):
wx.Frame.__init__(self, parent)
panel = wx.Panel(self)
self.panel = panel
vert_sizer = wx.BoxSizer(wx.VERTICAL)
self.vert_sizer = vert_sizer
panel.figure = Figure()
panel.canvas = FigureCanvas(panel, -1, panel.figure)
self.panel.canvas = panel.canvas
panel.axes = panel.figure.add_subplot(111)
self.panel.axes = panel.axes
vert_sizer.Add(panel.canvas, 1, wx.LEFT | wx.TOP | wx.EXPAND)
panel.SetSizer(vert_sizer)
panel.Fit()
self.plot_data()
self.panel.canvas.mpl_connect('pick_event', self.display_data)
def display_data(self, event):
wx.MessageBox('x :'+str(event.mouseevent.xdata) + 'y: ' + str(event.mouseevent.ydata), 'Info',wx.OK | wx.ICON_INFORMATION)
def plot_data(self):
x = np.arange(10)
y = np.random.randn(10)
self.panel.axes.plot(x,y, 'o', picker = 5)
def main():
app = wx.App()
GUI = PlotGUI(None)
GUI.Show()
app.MainLoop()
if __name__ == '__main__':
main()
当我第一次点击一个点时，数据正确显示。但是，下一次我点击一个点时，出现了错误。我尝试搜索此错误，但没有找到任何相关的主题。感谢您的帮助。
Traceback (most recent call last):
File "/home/pythontology/anaconda/lib/python2.7/site-packages/matplotlib/backends/backend_wx.py", line 1137, in _onLeftButtonDown
self.CaptureMouse()
File "/home/pythontology/anaconda/lib/python2.7/site-packages/wx-3.0-gtk2/wx/_core.py", line 10641, in CaptureMouse
return _core_.Window_CaptureMouse(*args, **kwargs)
wx._core.PyAssertionError: C++ assertion "!wxMouseCapture::IsInCaptureStack(this)" failed at ./src/common/wincmn.cpp(3271) in CaptureMouse(): Recapturing the mouse in the same window?