[Solved] Why does the following blitting code fail to update the plot visually? import matplotlib.pyplot as plt fig, ax = plt.... Why does the following blitting code fail to update the plot visually? | Matplotlib

Matplotlib - Animations

Why does the following blitting code fail to update the plot visually?

import matplotlib.pyplot as plt
fig, ax = plt.subplots()
background = fig.canvas.copy_from_bbox(ax.bbox)
line, = ax.plot([0, 1], [0, 1])
fig.canvas.restore_region(background)
fig.canvas.blit(ax.bbox)

AThe line data was not set before restoring the background

BThe background was saved after plotting the line

CThe blit method requires a figure bbox, not axes bbox

DThe updated artist was never redrawn after restoring the background

Step-by-Step Solution

Solution:

Step 1: Background saved correctly
Background saved before plotting line, so no issue there.
Step 2: Missing draw_artist call
After restoring background, the updated artist must be redrawn to appear.
Step 3: Blit only updates what is drawn
Without redraw, blit shows old background without the line.
Final Answer:
The updated artist was never redrawn after restoring the background -> Option D
Quick Check:
Must call draw_artist after restore_region [OK]

Quick Trick: Always draw_artist after restoring background [OK]

Common Mistakes:

Forgetting to redraw artist after restore_region
Using wrong bbox in blit
Saving background after plotting

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Why does the following blitting code fail to update the plot visually?

Step 1: Background saved correctly

Step 2: Missing draw_artist call

Step 3: Blit only updates what is drawn

Final Answer:

Quick Check:

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