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Flexitext advanced usage

First, you need to install flexitext with the following command: pip install flexitext.

Flexitext is one of 2 python libraries that make text formatting for matplotlib easy, along with highlight_text. It was created by Tomás Capretto and is inspired by the R package ggtext.

We'll also need to load matplotlib to create the figure.

import matplotlib.pyplot as plt
from flexitext import flexitext

There is no built-in method in flexitext to dynamically increase the size of the text, but we can build it ourselved!

The dynamic_text_prop() func:

• takes a string and applies a property (like size or opacity) to each letter.
• the property's value starts at initial_value and increases by increment for each letter.
• it skips spaces, keeping them as-is.
• it can optionally add an extra property to each letter thanks to the prop_to_add argument

def dynamic_text_prop(string, prop_name, initial_value, increment, prop_to_add=None):
    text = ""
    value = initial_value
    for letter in string:
        if letter != " ":
            if prop_to_add is not None:
                text += f"<{prop_name}:{value}, {prop_to_add}>{letter}</>"
            else:
                text += f"<{prop_name}:{value}>{letter}</>"
            value += increment
        else:
            text += " "
    return text

-

Let's see how to use it in practice:

# Init a figure
fig, ax = plt.subplots(figsize=(8, 8), dpi=200)

text = "this text has a weird size!"
text = dynamic_text_prop(text, prop_name='size', initial_value=10, increment=2)
flexitext(x=0.05, y=0.6, s=text)

# Display the output
plt.show()

And we can imagine exactly the same thing for dynamically changing opacity:

# Init a figure
fig, ax = plt.subplots(figsize=(8, 8), dpi=200)

text = "this text has a weird opacity!"
text = dynamic_text_prop(text, prop_name='alpha',
                         initial_value=0.1, increment=0.03, prop_to_add='size:25')
flexitext(x=0.05, y=0.6, s=text)

# Display the output
plt.show()

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