Helper for Bézier Curves, Triangles, and Higher Order Objects

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Documentation Status Zenodo DOI for ``bezier`` "Journal of Open Source Science" DOI for ``bezier``

This library provides:

Dive in and take a look!

https://raw.githubusercontent.com/dhermes/bezier/2020.2.3/docs/images/triangles6Q_and_7Q.png

Why Bézier?

A Bézier curve (and triangle, etc.) is a parametric curve that uses the Bernstein basis:

https://raw.githubusercontent.com/dhermes/bezier/2020.2.3/docs/images/bernstein_basis.png

to define a curve as a linear combination:

https://raw.githubusercontent.com/dhermes/bezier/2020.2.3/docs/images/bezier_defn.png

This comes from the fact that the weights sum to one:

https://raw.githubusercontent.com/dhermes/bezier/2020.2.3/docs/images/sum_to_unity.png

This can be generalized to higher order by considering three, four, etc. non-negative weights that sum to one (in the above we have the two non-negative weights s and 1 - s).

Due to their simple form, Bézier curves:

  • can easily model geometric objects as parametric curves, triangles, etc.

  • can be computed in an efficient and numerically stable way via de Casteljau’s algorithm

  • can utilize convex optimization techniques for many algorithms (such as curve-curve intersection), since curves (and triangles, etc.) are convex combinations of the basis

Many applications – as well as the history of their development – are described in “The Bernstein polynomial basis: A centennial retrospective”, for example;

  • aids physical analysis using finite element methods (FEM) on isogeometric models by using geometric shape functions called NURBS to represent data

  • used in robust control of dynamic systems; utilizes convexity to create a hull of curves

Installing

The bezier Python package can be installed with pip:

$ python    -m pip install --upgrade bezier
$ python3.8 -m pip install --upgrade bezier
$ # To install optional dependencies, e.g. SymPy
$ python    -m pip install --upgrade bezier[full]

To install a pure Python version (i.e. with no binary extension):

$ BEZIER_NO_EXTENSION=true \
>   python  -m pip install --upgrade bezier --no-binary=bezier

bezier is open-source, so you can alternatively grab the source code from GitHub and install from source.

Getting Started

For example, to create a curve:

>>> nodes1 = np.asfortranarray([
...     [0.0, 0.5, 1.0],
...     [0.0, 1.0, 0.0],
... ])
>>> curve1 = bezier.Curve(nodes1, degree=2)

The intersection (points) between two curves can also be determined:

>>> nodes2 = np.asfortranarray([
...     [0.0, 0.25,  0.5, 0.75, 1.0],
...     [0.0, 2.0 , -2.0, 2.0 , 0.0],
... ])
>>> curve2 = bezier.Curve.from_nodes(nodes2)
>>> intersections = curve1.intersect(curve2)
>>> intersections
array([[0.31101776, 0.68898224, 0. , 1. ],
       [0.31101776, 0.68898224, 0. , 1. ]])
>>> s_vals = np.asfortranarray(intersections[0, :])
>>> points = curve1.evaluate_multi(s_vals)
>>> points
array([[0.31101776, 0.68898224, 0. , 1. ],
       [0.42857143, 0.42857143, 0. , 0. ]])

and then we can plot these curves (along with their intersections):

>>> import seaborn
>>> seaborn.set()
>>>
>>> ax = curve1.plot(num_pts=256)
>>> _ = curve2.plot(num_pts=256, ax=ax)
>>> lines = ax.plot(
...     points[0, :], points[1, :],
...     marker="o", linestyle="None", color="black")
>>> _ = ax.axis("scaled")
>>> _ = ax.set_xlim(-0.125, 1.125)
>>> _ = ax.set_ylim(-0.0625, 0.625)
https://raw.githubusercontent.com/dhermes/bezier/2020.2.3/docs/images/curves1_and_13.png

For API-level documentation, check out the Bézier Python package documentation.

Development

To work on adding a feature or to run the functional tests, see the DEVELOPMENT doc for more information on how to get started.

Citation

For publications that use bezier, there is a JOSS paper that can be cited. The following BibTeX entry can be used:

@article{Hermes2017,
  doi = {10.21105/joss.00267},
  url = {https://doi.org/10.21105%2Fjoss.00267},
  year = {2017},
  month = {Aug},
  publisher = {The Open Journal},
  volume = {2},
  number = {16},
  pages = {267},
  author = {Danny Hermes},
  title = {Helper for B{\'{e}}zier Curves, Triangles, and Higher Order Objects},
  journal = {The Journal of Open Source Software}
}

A particular version of this library can be cited via a Zenodo DOI; see a full list by version.

License

bezier is made available under the Apache 2.0 License. For more details, see the LICENSE.

Project links

Key dates

PyPI data
Data sourced directly from PyPI's database.
  • Released:
Newer release available (2024.6.20)

1 maintainer

PyPI data
Data sourced directly from PyPI's database.
Avatar for bossylobster from gravatar.com bossylobster

Credits

Author: Danny Hermes

License

Apache Software License (Apache 2.0)

Tags

Geometry Curve Bezier Intersection Python

Classifiers

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BLAKE2b-256 18dbb15ece2068ac42a80f84dd715cdefcb501d93c4e2aaee421f68cffa7422e

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Release history Release notifications | RSS feed

2024.6.20

16 files

2023.7.28

21 files

2021.2.12

16 files

2020.5.19

16 files

This release

2020.2.3 This release

16 files

2020.1.14

16 files

0.11.0

16 files

0.10.0

11 files

0.9.0

18 files

0.8.0

18 files

0.7.0

18 files

0.6.4

18 files

0.6.3

18 files

0.6.2

18 files

0.6.1

18 files

0.6.0

18 files

0.5.0

18 files

0.4.0

13 files

0.3.0

2 files

0.2.1

2 files

0.2.0

2 files

0.1.1

2 files

0.1.0

2 files

0.0.1

2 files

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