当用户点击某个特定点时,我正试图动态地将垂直线添加到matplotlib图中.

import matplotlib.pyplot as plt

import matplotlib.dates as mdate

class PointPicker(object):

def __init__(self,dates,values):

self.fig = plt.figure()

self.ax = self.fig.add_subplot(111)

self.lines2d, = self.ax.plot_date(dates, values, linestyle='-',picker=5)

self.fig.canvas.mpl_connect('pick_event', self.onpick)

self.fig.canvas.mpl_connect('key_press_event', self.onpress)

def onpress(self, event):

"""define some key press events"""

if event.key.lower() == 'q':

sys.exit()

def onpick(self,event):

x = event.mouseevent.xdata

y = event.mouseevent.ydata

print self.ax.axvline(x=x, visible=True)

x = mdate.num2date(x)

print x,y,type(x)

if __name__ == '__main__':

import numpy as np

import datetime

dates=[datetime.datetime.now()+i*datetime.timedelta(days=1) for i in range(100)]

values = np.random.random(100)

plt.ion()

p = PointPicker(dates,values)

plt.show()

这是一个(几乎)工作的例子.当我点击一个点时,确实调用了onpick方法并且数据看起来是正确的,但是没有显示垂直线.我需要做什么才能让垂直线显示出来？

谢谢

解决方法:

您需要更新画布绘图(self.fig.canvas.draw())：

def onpick(self,event):

x = event.mouseevent.xdata

y = event.mouseevent.ydata

L = self.ax.axvline(x=x)

self.fig.canvas.draw()

标签：python,matplotlib