splinebox.spline_curves.HermiteSpline.

rotate

HermiteSpline.rotate(rotation_matrix, centred=True)

Rotate the spline with the provided rotation matrix.

Parameters:

rotation_matrixnumpy.ndarray

The rotation matrix applied to the spline.

Examples

>>> import splinebox
>>> import numpy as np
>>> import matplotlib.pyplot as plt

We start by creating a spline

>>> spline = splinebox.Spline(M=4, basis_function=splinebox.B3(), closed=True)
>>> spline.control_points = np.array([[3, 0], [1, 1], [-1, 0], [-1, -1]])

Let’s plot the spline:

>>> t = np.linspace(0, spline.M, 1000)
>>> vals = spline(t)
>>> plt.plot(vals[:, 0], vals[:, 1], label="orig")

Next, we rotate the spline and plot it again:

>>> theta = np.deg2rad(45)
>>> rotation_matrix = np.array([[np.cos(theta), -np.sin(theta)], [np.sin(theta),  np.cos(theta)]])
>>> spline.rotate(rotation_matrix)
>>> vals = spline(t)
>>> plt.plot(vals[:, 0], vals[:, 1], linestyle="--", label="rotated")
>>> plt.legend()
>>> plt.show()