Plot rotated ellipse

ellipse_plot.py

""" From: https://math.stackexchange.com/a/2647450/635480 """

import numpy as np
import matplotlib.pyplot as plt

def plot_rotated_ellipse(cx=1, cy=2, rx=3, ry=0.5, theta=np.pi/4):
    alpha = np.linspace(0, 2*np.pi, 100)
    x = rx*np.cos(alpha)*np.cos(theta) - ry*np.sin(alpha)*np.sin(theta) + cx
    y = rx*np.cos(alpha)*np.sin(theta) + ry*np.sin(alpha)*np.cos(theta) + cy
    plt.plot(x, y)
plot_rotated_ellipse()