如何在交互式绘图（Python）中获得用鼠标指向的（x，y）位置？ [英] How get a (x,y) position pointing with mouse in a interactive plot (Python)?

问题描述

我使用ipython笔记本（带有神奇的％matplotlib nbagg ）。我正在查看 matplotlib.widget.Cursor ，但是仅在 widgets.Cursor 。因此，我想在图中单击选择两个点，然后获得初始和最终的x，y位置（例如，时间与温度的关系，选择要返回的点必须返回初始和最终时间）。我需要它来手动选择任意间隔。我认为它类似于获得全局x，y位置，但在那篇文章中我不太了解。

I use ipython notebook (with the magic %matplotlib nbagg). I was reviewing the matplotlib.widget.Cursor but the cursor is only viewed widgets.Cursor. So I'd like to select two points clicking in the plot and get the initial and final x,y-position (e.g. time vs Temperature, selecting to points must return initial and final time). I need it for selecting manually an arbitrary interval.I think it's similar to get global x,y position, but i didn't understand well in that post.

Obs。类似于IDL中的CURSOR过程

Obs. Something similar to CURSOR Procedure in IDL

推荐答案

事件处理应该起作用。

import matplotlib.pylab as plt
import numpy as np

f,a = plt.subplots()
x = np.linspace(1,10,100)
y = np.sin(x)
a.plot(x,y)
pos = []
def onclick(event):
    pos.append([event.xdata,event.ydata])
f.canvas.mpl_connect('button_press_event', onclick)
f.show()

每次单击都会将当前光标位置附加到pos。

On each click the current cursor position is appended to pos.

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