How to change the color of a line using radiobuttons in Matplotlib?

To change the color of a line using radiobutton we can take following steps −

• Create x and y data points using numpy.

• Adjust the figure size and padding between and around the subplots.

• Create a figure and a set of subplots using subplots() method.

• Plot curve with x and y data points using plot() method.

• Add an axes to the current figure and make it the current axes, using axes() method.

• Add a radio button to the current axes.

• Change the color of the curve with radion button using change_color() method, that can be passed in on_clicked() method.

• To display the figure use show() method.

Example

import numpy as np
from matplotlib import pyplot as plt
from matplotlib.widgets import RadioButtons
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

x = np.linspace(-2, 2, 100)
y = np.sin(x)
fig, ax = plt.subplots()
curve, = ax.plot(x, y)
rb_axis = plt.axes([0.25, 0.60, 0.15, 0.15])
radio_button = RadioButtons(rb_axis, ('yellow', 'green', 'red',))

def change_color(c_label):
   curve.set_color(c_label)
   plt.draw()

radio_button.on_clicked(change_color)
plt.show()

Output

Now, use the radiobuttons to change the color of the curve inside the plot.