"""
Line Collection Simple
======================

Example showing how to plot line collections
"""

# test_example = true
# sphinx_gallery_pygfx_docs = 'screenshot'

from itertools import product
import numpy as np
import fastplotlib as fpl


def make_circle(center, radius: float, n_points: int = 75) -> np.ndarray:
    theta = np.linspace(0, 2 * np.pi, n_points)
    xs = radius * np.sin(theta)
    ys = radius * np.cos(theta)

    return np.column_stack([xs, ys]) + center


spatial_dims = (100, 100)

circles = list()
for center in product(range(0, spatial_dims[0], 15), range(0, spatial_dims[1], 15)):
    circles.append(make_circle(center, 5, n_points=75))

pos_xy = np.vstack(circles)

figure = fpl.Figure(size=(700, 560))

figure[0, 0].add_line_collection(circles, cmap="jet", thickness=5)

# remove clutter
figure[0, 0].axes.visible = False

figure.show()


# NOTE: fpl.loop.run() should not be used for interactive sessions
# See the "JupyterLab and IPython" section in the user guide
if __name__ == "__main__":
    print(__doc__)
    fpl.loop.run()