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"""

Infinite Lines

==============

Draw infinite vertical and horizontal lines to mark positions on a plot.

"""

# test_example = true

# sphinx_gallery_pygfx_docs = 'screenshot'

import fastplotlib as fpl

import numpy as np

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

xs = np.linspace(0, 4 * np.pi, 100)

ys = np.sin(xs)

data = np.column_stack([xs, ys])

figure[0, 0].add_line(data, thickness=2, colors="w")

# vertical lines at the zero-crossings, one color per line by passing a list of colors

zero_crossings = np.array([0, np.pi, 2 * np.pi, 3 * np.pi, 4 * np.pi])

figure[0, 0].add_inf_line(

zero_crossings, axis="x", colors=["r", "g", "b", "c", "m"], thickness=2

)

# dashed horizontal lines at the sine bounds, provided as a 1D array of y-values

figure[0, 0].add_inf_line(

np.array([-1.0, 1.0]),

axis="y",

colors="gray",

thickness=2,

dash_pattern="--",

)

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()