no_broken_streamlines.rst

Add option to plt.streamplot to not break streamlines

It is now possible to specify that streamplots have continuous, unbroken streamlines. Previously streamlines would end to limit the number of lines within a single grid cell. See the difference between the plots below:

.. plot::

    import matplotlib.pyplot as plt
    import numpy as np

    w = 3
    Y, X = np.mgrid[-w:w:100j, -w:w:100j]
    U = -1 - X**2 + Y
    V = 1 + X - Y**2
    speed = np.sqrt(U**2 + V**2)

    fig, (ax0, ax1) = plt.subplots(1, 2, sharex=True)

    ax0.streamplot(X, Y, U, V, broken_streamlines=True)
    ax0.set_title('broken_streamlines=True')

    ax1.streamplot(X, Y, U, V, broken_streamlines=False)
    ax1.set_title('broken_streamlines=False')