Bezier/README.md

Bezier

Create bezier curves, sample them at arbitrary points, and easily plot them.

Call with either a list of ordered pairs: Bezier([(x0,y0), (x1,y1), ... , (xn,yn)])

or a seperate list of x and y coordinates: Bezier([x0, x1, ... , xn], [y0, y1, ... , yn])

Optional Parameters:

points=False

If points is False, Bezier returns (x, y), where x and y are lists of x and y coordinates, respectively.

If points is True, Bezier returns [(x0, y0), (x1, y1), ... , (xn, yn)].

step=1e-3

When slicing Bezier, if a step size is not provided this is used instead.

Using Bezier

After creating the curve, retrieve points using the __getitem__ function, similar to indexing a list.

import bezier

bez = bezier.Bezier([1,3,4],[2,4,3])

x,y = bez[.2]

You can also slice Bezier to return several values at once. start and stop default to 0 and 1 respectively (or 1 and 0 if step is negative) and step will default to the value set at instanciation.

x,y = bez[.1:.6:.001]
x,y = bez[::.01]

An empty slice object will return the entire curve (at the reolution set by step), which provies a quick way to plot the entire curve.

import matplotlib.pyplot as plt
x,y = bez[:]
plt.plot(x, y)

Or, more succinctly:

plt.plot(*bez[:])