matplotlib 中的点和线工具提示？

Question

我有一个带有一些线段的图表（LineCollection）和一些点。这些线和点有一些与之相关的值，但未用图表表示。我希望能够添加鼠标悬停工具提示或其他方法来轻松查找点和线的关联值。对于点或线段来说这可能吗？

Answer 1

对于积分，我已经找到办法了，但是你必须使用WX后端

"""Example of how to use wx tooltips on a matplotlib figure window.
Adapted from http://osdir.com/ml/python.matplotlib.devel/2006-09/msg00048.html"""

import matplotlib as mpl
mpl.use('WXAgg')
mpl.interactive(False)

import pylab as pl
from pylab import get_current_fig_manager as gcfm
import wx
import numpy as np
import random


class wxToolTipExample(object):
    def __init__(self):
        self.figure = pl.figure()
        self.axis = self.figure.add_subplot(111)

        # create a long tooltip with newline to get around wx bug (in v2.6.3.3)
        # where newlines aren't recognized on subsequent self.tooltip.SetTip() calls
        self.tooltip = wx.ToolTip(tip='tip with a long %s line and a newline\n' % (' '*100))
        gcfm().canvas.SetToolTip(self.tooltip)
        self.tooltip.Enable(False)
        self.tooltip.SetDelay(0)
        self.figure.canvas.mpl_connect('motion_notify_event', self._onMotion)

        self.dataX = np.arange(0, 100)
        self.dataY = [random.random()*100.0 for x in xrange(len(self.dataX))]
        self.axis.plot(self.dataX, self.dataY, linestyle='-', marker='o', markersize=10, label='myplot')

    def _onMotion(self, event):
        collisionFound = False
        if event.xdata != None and event.ydata != None: # mouse is inside the axes
            for i in xrange(len(self.dataX)):
                radius = 1
                if abs(event.xdata - self.dataX[i]) < radius and abs(event.ydata - self.dataY[i]) < radius:
                    top = tip='x=%f\ny=%f' % (event.xdata, event.ydata)
                    self.tooltip.SetTip(tip) 
                    self.tooltip.Enable(True)
                    collisionFound = True
                    break
        if not collisionFound:
            self.tooltip.Enable(False)



example = wxToolTipExample()
pl.show()

Answer 2

这是一个旧线程，但如果有人正在寻找如何向行添加工具提示，这有效：

import matplotlib.pyplot as plt
import numpy as np
import mpld3

f, ax = plt.subplots()
x1 = np.array([0,100], int)
x2 = np.array([10,110], int)
y = np.array([0,100], int)

line = ax.plot(x1, y)
mpld3.plugins.connect(f, mpld3.plugins.LineLabelTooltip(line[0], label='label 1'))

line = ax.plot(x2, y)
mpld3.plugins.connect(f, mpld3.plugins.LineLabelTooltip(line[0], label='label 2'))

mpld3.show()

Answer 3

也许这个食谱的变体可以满足你想要的积分？至少不限于wx后端。