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"""
==========================
Scatter plot on polar axis
==========================
Size increases radially in this example and color increases with angle
(just to verify the symbols are being scattered correctly).
"""
import matplotlib.pyplot as plt
import numpy as np
# Fixing random state for reproducibility
np.random.seed(19680801)
# Compute areas and colors
N = 150
r = 2 * np.random.rand(N)
theta = 2 * np.pi * np.random.rand(N)
area = 200 * r**2
colors = theta
fig = plt.figure()
ax = fig.add_subplot(projection='polar')
c = ax.scatter(theta, r, c=colors, s=area, cmap='hsv', alpha=0.75)
# %%
# Scatter plot on polar axis, with offset origin
# ----------------------------------------------
#
# The main difference with the previous plot is the configuration of the origin
# radius, producing an annulus. Additionally, the theta zero location is set to
# rotate the plot.
fig = plt.figure()
ax = fig.add_subplot(projection='polar')
c = ax.scatter(theta, r, c=colors, s=area, cmap='hsv', alpha=0.75)
ax.set_rorigin(-2.5)
ax.set_theta_zero_location('W', offset=10)
# %%
# Scatter plot on polar axis confined to a sector
# -----------------------------------------------
#
# The main difference with the previous plots is the configuration of the
# theta start and end limits, producing a sector instead of a full circle.
fig = plt.figure()
ax = fig.add_subplot(projection='polar')
c = ax.scatter(theta, r, c=colors, s=area, cmap='hsv', alpha=0.75)
ax.set_thetamin(45)
ax.set_thetamax(135)
plt.show()
# %%
#
# .. admonition:: References
#
# The use of the following functions, methods, classes and modules is shown
# in this example:
#
# - `matplotlib.axes.Axes.scatter` / `matplotlib.pyplot.scatter`
# - `matplotlib.projections.polar`
# - `matplotlib.projections.polar.PolarAxes.set_rorigin`
# - `matplotlib.projections.polar.PolarAxes.set_theta_zero_location`
# - `matplotlib.projections.polar.PolarAxes.set_thetamin`
# - `matplotlib.projections.polar.PolarAxes.set_thetamax`
#
# .. tags::
#
# plot-style: polar
# plot-style: scatter
# level: beginner
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