Path simplification in Matplotlib - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the path simplification function from matplotlib.

Matplotlib

from matplotlib.path import [1]

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Asimplify_path

BPathPatch

CPath

DPathEffect

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to import a function named 'simplify_path' which does not exist.

Importing 'PathPatch' which is for patches, not paths.

The Path class from matplotlib.path is used to create and manipulate paths, including simplification.

2fill in blank

medium

Complete the code to create a Path object from a list of points.

Matplotlib

import numpy as np
points = np.array([[0, 0], [1, 2], [2, 3], [3, 1]])
codes = [[1], 2, 2, 2]
path = Path(points, codes)

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APath.MOVETO

B0

CPath.LINETO

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using integer 1 instead of the constant Path.MOVETO.

Using Path.LINETO for the first point which is incorrect.

The first code in a path must be Path.MOVETO to start the path at the first point.

3fill in blank

hard

Fix the error in the code to simplify the path using the 'simplify_threshold' parameter.

Matplotlib

simplified_path = path.cleaned([1]=0.1)

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Asimplify

Bsimplify_threshold

Cthreshold

Dclean_threshold

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'simplify' instead of 'simplify_threshold'.

Using 'threshold' or 'clean_threshold' which are invalid parameter names.

The cleaned method of Path accepts the parameter simplify_threshold to control simplification.

4fill in blank

hard

Fill both blanks to create a simplified path and plot it with matplotlib.

Matplotlib

import matplotlib.pyplot as plt
fig, ax = plt.subplots()
simplified = path.cleaned([1]=0.05)
ax.plot(*simplified.vertices.T, [2]='blue')
plt.show()

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Asimplify_threshold

Bcolor

Clinewidth

Dlinestyle

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'linewidth' or 'linestyle' instead of 'color' for line color.

Using wrong parameter name for simplification.

Use simplify_threshold to simplify the path and color to set the line color in ax.plot.

5fill in blank

hard

Fill all three blanks to create a path, simplify it, and plot both original and simplified paths with different colors.

Matplotlib

import matplotlib.pyplot as plt
fig, ax = plt.subplots()
codes = [Path.MOVETO, Path.LINETO, Path.LINETO, Path.LINETO]
points = [[0, 0], [1, 2], [2, 3], [3, 1]]
path = Path([1], [2])
simplified = path.cleaned([3]=0.1)
ax.plot(*path.vertices.T, color='red', label='Original')
ax.plot(*simplified.vertices.T, color='green', label='Simplified')
ax.legend()
plt.show()

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Apoints

Bcodes

Csimplify_threshold

Dvertices

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping points and codes in Path constructor.

Using 'vertices' instead of 'points' or 'codes'.

Using wrong parameter name for simplification.

Create the path with points and codes, then simplify using simplify_threshold.