matplotlib multiple values under cursor

Question

This question is very similar to those answered here,

In a matplotlib figure window (with imshow), how can I remove, hide, or redefine the displayed position of the mouse?

Interactive pixel information of an image in Python?

except that instead of pixel data (x,y,z) I have various measurements associated with (x,y) coordinates that I'd like to portray on a line plot. Specifically, the (x,y) are spatial positions (lat, lon) and at each (lat,lon) point there is a collection of data (speed, RPM, temp, etc.). I just sketched up something quickly to illustrate, a scatter plot with connecting lines, and then when you hover over a data point it displays all of the "z" values associated with that data point.

Is there an easy way to do something like this?

Possible duplicate of Interactive pixel information of an image in Python? — tmdavison
– tmdavison, Commented Sep 7, 2016 at 8:36

Bart · Accepted Answer · 2016-09-07 07:44:07Z

You could probably build on something like this example. It doesn't display the information inside the figure (for now only using a print() statement), but it demonstrates a simple method of capturing clicks on scatter points and showing information for those points:

import numpy as np
import matplotlib.pylab as pl

pl.close('all')

n = 10
lat = np.random.random(n)
lon = np.random.random(n)

speed = np.random.random(n)
rpm   = np.random.random(n)
temp  = np.random.random(n)

def on_click(event):
    i = event.ind[0]
    print('lon={0:.2f}, lat={1:.2f}: V={2:.2f}, RPM={3:.2f}, T={4:.2f}'\
        .format(lon[i], lat[i], speed[i], rpm[i], temp[i])) 

fig=pl.figure()
pl.plot(lon, lat, '-')
pl.scatter(lon, lat, picker=True)
fig.canvas.mpl_connect('pick_event', on_click)

Clicking around a bit gives me:

lon=0.63, lat=0.58: V=0.51, RPM=0.00, T=0.43
lon=0.41, lat=0.07: V=0.95, RPM=0.59, T=0.98
lon=0.86, lat=0.13: V=0.33, RPM=0.27, T=0.85

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