Save bezier curve to a file in python

Question

I am using bezier to generate a Bezier curve. Below is the sample code:

import bezier
nodes = np.array([
     [0.0 ,  0.0],
     [0.25,  2.0],
     [0.5 , -2.0],
     [0.75,  2.0],
     [1.0 ,  0.3],
 ])
curve = bezier.Curve.from_nodes(nodes)

import matplotlib.pyplot as plt
curve.plot(num_pts=256)
plt.show()

Please see below the generated plot.

I want to save this trajectory (let say to a file). In other words, I want to save x,y value of each point in this curve. I was expecting it to return a numpy array but it is not. kindly suggest.

Answer 1

ax = plt.gca() 
line = ax.lines[0]
x = line.get_xdata()
y = line.get_ydata()
xy = np.vstack([x,y]).transpose()
np.save('bezier_data', xy)

I worked it out from the answer here . Those xvals and yvals are NumPy arrays you can put them into one if you need it.

Might help to not execute plt.show() before these lines.