Matplotlib.axes.Axes.draw_artist() in Python
Last Updated :
30 Apr, 2020
Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. The Axes Class contains most of the figure elements: Axis, Tick, Line2D, Text, Polygon, etc., and sets the coordinate system. And the instances of Axes supports callbacks through a callbacks attribute.
matplotlib.axes.Axes.draw_artist() Function
The Axes.draw_artist() function in axes module of matplotlib library is used to efficiently update Axes data.
Syntax: Axes.draw_artist(self, a)
Parameters: This method accepts the following parameters.
- a: This parameter is the artist to be draw.
Returns: This method does not return any value.
Note: This method can only be used after an initial draw which caches the renderer.
Below examples illustrate the matplotlib.axes.Axes.draw_artist() function in matplotlib.axes:
Example 1:
from random import randint, choice
import time
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches
back_color = "black"
colors = [ 'red' , 'green' , 'blue' , 'purple' ]
width, height = 4 , 4
fig, ax = plt.subplots()
ax. set (xlim = [ 0 , width], ylim = [ 0 , height])
fig.canvas.draw()
def update():
x = randint( 0 , width - 1 )
y = randint( 0 , height - 1 )
arti = mpatches.Rectangle(
(x, y), 1 , 1 ,
facecolor = choice(colors),
edgecolor = back_color
)
ax.add_artist(arti)
start = time.time()
ax.draw_artist(arti)
fig.canvas.blit(ax.bbox)
print ( "Draw at time :" , time.time() - start)
timer = fig.canvas.new_timer(interval = 1 )
timer.add_callback(update)
timer.start()
ax.set_title('matplotlib.axes.Axes.draw_artist()\
function Example')
plt.show()
|
Output:
Draw at time : 0.37501978874206543
Draw at time : 0.015624046325683594
Draw at time : 0.03127431869506836
Draw at time : 0.015625953674316406
Draw at time : 0.015601396560668945
Draw at time : 0.015614986419677734
........
so on...
Example 2:
import matplotlib.pyplot as plt
import numpy as np
import time
fig, ax = plt.subplots()
line, = ax.plot(np.random.randn( 100 ))
tstart = time.time()
num_plots = 0
fig.canvas.draw()
while time.time() - tstart < 5 :
line.set_ydata(np.random.randn( 100 ))
ax.draw_artist(ax.patch)
ax.draw_artist(line)
num_plots + = 1
ax.set_title('matplotlib.axes.Axes.draw_artist() \
function Example')
plt.show()
|
Output:
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