Matplotlib.artist.Artist.update_from() in Python

Matplotlib.artist.Artist.update_from() in Python

In Matplotlib, everything displayed in the figure window (e.g., lines, text, patches, and axes) is an instance of an Artist or one of its subclasses. The Artist class provides a foundational structure for building complex graphical elements.

The update_from() method of the matplotlib.artist.Artist class is a utility method to update properties from one artist to another. Essentially, it copies properties of another Artist instance to the current one.

Here's a brief overview and an example of how to use update_from():

Usage:

artist.update_from(other_artist)

This will update properties of artist with those from other_artist.

Example:

Let's consider a simple example using Line2D objects, which are subclasses of Artist:

import matplotlib.pyplot as plt import numpy as np x = np.linspace(0, 10, 100) y = np.sin(x) # Create two line objects line1, = plt.plot(x, y, '-r', linewidth=2.0) line2, = plt.plot(x, -y, '--b') # Now let's make line2 look like line1 by copying properties from line1 to line2 line2.update_from(line1) # Display the plot plt.show()

In this example, both the lines will look the same after the call to update_from(), even though we initially defined line2 to be a blue dashed line. After the update, line2 will look like line1 - a solid red line.

Note that while many properties will be updated, not every single one might be. The specifics depend on the implementation of the Artist subclasses. It's always a good idea to consult the Matplotlib documentation or source code if you need precise behavior.

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