import numpy as np
from matplotlib.patches import Circle, RegularPolygon
from matplotlib.path import Path
from matplotlib.projections import register_projection
from matplotlib.projections.polar import PolarAxes
from matplotlib.spines import Spine
from matplotlib.transforms import Affine2D
[docs]
def spider_factory(num_vars, frame='circle'):
"""
Taken from https://matplotlib.org/stable/gallery/specialty_plots/radar_chart.html
Create a radar chart with `num_vars` axes.
This function creates a RadarAxes projection and registers it.
Parameters
----------
num_vars : int
Number of variables for radar chart.
frame : {'circle', 'polygon'}
Shape of frame surrounding axes.
"""
# calculate evenly-spaced axis angles
theta = np.linspace(0, 2 * np.pi, num_vars, endpoint=False)
class RadarTransform(PolarAxes.PolarTransform):
def transform_path_non_affine(self, path):
# Paths with non-unit interpolation steps correspond to gridlines,
# in which case we force interpolation (to defeat PolarTransform's
# autoconversion to circular arcs).
if path._interpolation_steps > 1:
path = path.interpolated(num_vars)
return Path(self.transform(path.vertices), path.codes)
class RadarAxes(PolarAxes):
name = 'radar'
PolarTransform = RadarTransform
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# rotate plot such that the first axis is at the top
self.set_theta_zero_location('N')
def fill(self, *args, closed=True, **kwargs):
"""Override fill so that line is closed by default"""
return super().fill(closed=closed, *args, **kwargs)
def plot(self, *args, **kwargs):
"""Override plot so that line is closed by default"""
lines = super().plot(*args, **kwargs)
for line in lines:
self._close_line(line)
def _close_line(self, line):
x, y = line.get_data()
# FIXME: markers at x[0], y[0] get doubled-up
if x[0] != x[-1]:
x = np.append(x, x[0])
y = np.append(y, y[0])
line.set_data(x, y)
def set_varlabels(self, labels):
self.set_thetagrids(np.degrees(theta), labels)
def _gen_axes_patch(self):
# The Axes patch must be centered at (0.5, 0.5) and of radius 0.5
# in axes coordinates.
if frame == 'circle':
return Circle((0.5, 0.5), 0.5)
elif frame == 'polygon':
return RegularPolygon((0.5, 0.5), num_vars,
radius=.5, edgecolor="k")
else:
raise ValueError("Unknown value for 'frame': %s" % frame)
def _gen_axes_spines(self):
if frame == 'circle':
return super()._gen_axes_spines()
elif frame == 'polygon':
# spine_type must be 'left'/'right'/'top'/'bottom'/'circle'.
spine = Spine(axes=self,
spine_type='circle',
path=Path.unit_regular_polygon(num_vars))
# unit_regular_polygon gives a polygon of radius 1 centered at
# (0, 0) but we want a polygon of radius 0.5 centered at (0.5,
# 0.5) in axes coordinates.
spine.set_transform(Affine2D().scale(.5).translate(.5, .5)
+ self.transAxes)
return {'polar': spine}
else:
raise ValueError("Unknown value for 'frame': %s" % frame)
register_projection(RadarAxes)
return theta
[docs]
def get_polygon_corners(theta, bottom, top):
"""
Retrieves the corners of a polygon encompassed by the shades borders to allow for proper shading
:param theta: radius reference
:param bottom: lower border of the shading. y values
:param top: upper border of the shading. y values
:return: x and y values of the polygon encompassed by the borders
"""
x = []
y = []
for i in theta:
x.append(i)
x.append(i)
for i in range(len(theta)):
y.append(bottom[i])
y.append(top[i])
return x, y
[docs]
def plot_spider_single_trace(ax, data, color, theta, zorder=0):
"""
Plots a single trace on a spider plot (radar plot)
:param ax: axis to plot on
:param data: dataset to plot
:param color: color to use to plot
:param theta: radius reference
:param zorder: z-order for stacking
:return:
"""
count_avg = data["mean"].values
n_stat = data["lower_bound"].values
n_stat[n_stat < 0] = 0
p_stat = data["upper_bound"].values
ax.plot(theta, count_avg, color=color, linewidth=3, zorder=zorder + 10)
ax.scatter(theta, count_avg, color=color, s=50, zorder=zorder + 20)
ax.fill_between(theta, n_stat, p_stat,
facecolor=color, alpha=0.4, zorder=zorder)
ax.fill([theta[0], theta[0], theta[-1], theta[-1]], [p_stat[0], n_stat[0], n_stat[-1], p_stat[-1]],
facecolor=color, alpha=0.4, zorder=zorder)
