How to add hovering annotations with multiple curves

Question

I am using matplotlib to plot multiple curves (time series) in one plot. To do this, I use a for loop as seen below.

%matplotlib

for i in range(0, len(force)):

    plt.plot(distance, (force[i]), alpha=0.1)
    
    plt.xlabel('Distance [mm]', fontsize=12)
    plt.ylabel('Force [N]', fontsize=12)

Unfortunately, with the number of curves (approx. 70) that I have, the plot would be unreadable if I labeled each curve. Does anyone know of a way to create labels that only appear when the cursor hovers in the vicinity of that curve (timeseries)?

I looked on the example from this post, but have no clue how to adapt it to my issue:

Possible to make labels appear when hovering over a point in matplotlib?

can you provide standalone code for debugging?

lemon
– lemon

2022-06-11 16:16:27 +00:00
Commented Jun 11, 2022 at 16:16 — lemon
– lemon, Commented Jun 11, 2022 at 16:16

JohanC · Accepted Answer · 2022-06-11 17:24:46Z

1

You could use mplcursors. Each curve can have a unique label, which is shown by default.

from matplotlib import pyplot as plt
import mplcursors
import numpy as np

force = np.random.randn(70, 100).cumsum(axis=1)
force -= force.mean(axis=1, keepdims=True)
plt.figure(figsize=(12, 5))
for i in range(len(force)):
     plt.plot(force[i], alpha=0.2, label=f'force[{i}]')
plt.margins(x=0.01)
cursor = mplcursors.cursor(hover=True)
plt.show()

If you're working with a Jupyter notebook, you might need %matplotlib nbagg or %matplotlib qt instead of %matplotlib inline to enable interactivity.

answered Jun 11, 2022 at 17:24

JohanC

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