How to make a polygon radar (spider) chart in Python Matplotlib?



To make a polygon radar (spider) chart in Python, we can take the following steps −

Steps

  • Set the figure size and adjust the padding between and around the subplots.

  • Create a Pandas dataframe with sports and values columns.

  • Create a new figure or activate an existing figure.

  • Add an 'ax' to the figure as part of a subplot arrangement.

  • Based on data frame values, get the theta value.

  • Get the values list of the data frame.

  • Make a bar plot with theta and values data points.

  • Fill the area between polygon.

  • To display the figure, use show() method.

Example

import pandas as pd
import matplotlib.pyplot as plt
import numpy as np

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

df = pd.DataFrame({'sports': ['Strength', 'Speed', 'Power', 'Agility', 'Endurance', 'Analytical Aptitude'], 'values': [7, 8, 6, 10, 8, 9]})

fig = plt.figure()

ax = fig.add_subplot(111, projection="polar")

theta = np.arange(len(df) + 1) / float(len(df)) * 2 * np.pi

values = df['values'].values
values = np.append(values, values[0])

l1, = ax.plot(theta, values, color="purple", marker="o", label="Name of values")

ax.tick_params(pad=10)
ax.fill(theta, values, 'green', alpha=0.3)

plt.show()

Output

It will produce the following output −


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