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Matplotlib.artist.Artist.update_from() in Python

  • Last Updated : 10 May, 2020

Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. The Artist class contains Abstract base class for objects that render into a FigureCanvas. All visible elements in a figure are subclasses of Artist.

matplotlib.artist.Artist.update_from() method

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The update_from() method in artist module of matplotlib library is used to copy properties from other to self.

Syntax: Artist.update_from(self, other )

Parameters: This method accepts the following parameters.

  • other : This parameter is the property to be updated.

Returns: This method return dictionary of all the properties of the artist.

Below examples illustrate the matplotlib.artist.Artist.update_from() function in matplotlib:

Example 1:

# Implementation of matplotlib function
from matplotlib.artist import Artist
import numpy as np 
import matplotlib.pyplot as plt 
from matplotlib.legend_handler import HandlerLine2D 
x = np.linspace(0, 3 * np.pi) 
y1 = np.sin(x) 
y2 = np.cos(x) 
fig = plt.figure() 
ax = fig.add_subplot(111
ax.plot(x, y1, c ='b', label ='y1', linewidth = 1.0
ax.plot(x, y2, c ='g', label ='y2'
linewidth = 7
def update(prop1, prop2): 
    Artist.update_from(prop1, prop2) 
plt.legend(handler_map ={plt.Line2D : HandlerLine2D(update_func = update)}) 
 function Example', fontweight ="bold"


Example 2:

# Implementation of matplotlib function
from matplotlib.artist import Artist
import numpy as np  
import matplotlib.pyplot as plt 
import matplotlib.transforms as mtransforms 
fig, ax = plt.subplots()  
l1, = ax.plot([0.1, 0.5, 0.9],  
              [0.1, 0.9, 0.5],  
l2, = ax.plot([0.1, 0.5, 0.9], 
              [0.5, 0.2, 0.7],  
for l in [l1, l2]: 
    xx = l.get_xdata() 
    yy = l.get_ydata() 
    shadow, = ax.plot(xx, yy) 
    Artist.update_from(shadow, l) 
    ot = mtransforms.offset_copy(l.get_transform(), 
                                 x = 4.0,  
                                 y =-6.0,  
                                 units ='points'
function Example', fontweight ="bold"


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