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"""
=========
Step Demo
=========
This example demonstrates the use of `.pyplot.step` for piece-wise constant
curves. In particular, it illustrates the effect of the parameter *where*
on the step position.
.. note::
For the common case that you know the edge positions, use `.pyplot.stairs`
instead.
The circular markers created with `.pyplot.plot` show the actual data
positions so that it's easier to see the effect of *where*.
"""
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(14)
y = np.sin(x / 2)
plt.step(x, y + 2, label='pre (default)')
plt.plot(x, y + 2, 'o--', color='grey', alpha=0.3)
plt.step(x, y + 1, where='mid', label='mid')
plt.plot(x, y + 1, 'o--', color='grey', alpha=0.3)
plt.step(x, y, where='post', label='post')
plt.plot(x, y, 'o--', color='grey', alpha=0.3)
plt.grid(axis='x', color='0.95')
plt.legend(title='Parameter where:')
plt.title('plt.step(where=...)')
plt.show()
# %%
# The same behavior can be achieved by using the ``drawstyle`` parameter of
# `.pyplot.plot`.
plt.plot(x, y + 2, drawstyle='steps', label='steps (=steps-pre)')
plt.plot(x, y + 2, 'o--', color='grey', alpha=0.3)
plt.plot(x, y + 1, drawstyle='steps-mid', label='steps-mid')
plt.plot(x, y + 1, 'o--', color='grey', alpha=0.3)
plt.plot(x, y, drawstyle='steps-post', label='steps-post')
plt.plot(x, y, 'o--', color='grey', alpha=0.3)
plt.grid(axis='x', color='0.95')
plt.legend(title='Parameter drawstyle:')
plt.title('plt.plot(drawstyle=...)')
plt.show()
# %%
#
# .. admonition:: References
#
# The use of the following functions, methods, classes and modules is shown
# in this example:
#
# - `matplotlib.axes.Axes.step` / `matplotlib.pyplot.step`
# - `matplotlib.axes.Axes.plot` / `matplotlib.pyplot.plot`
#
# .. tags::
#
# plot-type: step
# plot-type: line
# level: beginner
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