I want to plot a radar chart with multiple scales on multiple axes using matplotlib
. The official API example gives only one scale on one axis. (Scales are 0.2,0.4,0.6,0.8 in this example)
I want different scales on all axes. (There are 9 axes in the given example.)
I found an example of what I am looking for here. There are 5 axes on this example and 5 scales on all axes just like I want.
Click on Change Chart Type and select Radar, then "Radar with Markers" or "Filled Radar"; Click on Add Chart Elements (on the toolbar), then click on Axes, More Axes Options...; Click on Fill & Line icon (under the button "Axis Options"), find Line section and click on Solid line.
The Filled Radar Chart is an extension of the simple radar chart. This chart type adds filling or colors to the empty space between the lines and the center of the spider web.
I think you can plot this with multiple axes, the lines are in the first axe, and other axes only shows ticklabels.
import numpy as np
import pylab as pl
class Radar(object):
def __init__(self, fig, titles, labels, rect=None):
if rect is None:
rect = [0.05, 0.05, 0.95, 0.95]
self.n = len(titles)
self.angles = np.arange(90, 90+360, 360.0/self.n)
self.axes = [fig.add_axes(rect, projection="polar", label="axes%d" % i)
for i in range(self.n)]
self.ax = self.axes[0]
self.ax.set_thetagrids(self.angles, labels=titles, fontsize=14)
for ax in self.axes[1:]:
ax.patch.set_visible(False)
ax.grid("off")
ax.xaxis.set_visible(False)
for ax, angle, label in zip(self.axes, self.angles, labels):
ax.set_rgrids(range(1, 6), angle=angle, labels=label)
ax.spines["polar"].set_visible(False)
ax.set_ylim(0, 5)
def plot(self, values, *args, **kw):
angle = np.deg2rad(np.r_[self.angles, self.angles[0]])
values = np.r_[values, values[0]]
self.ax.plot(angle, values, *args, **kw)
fig = pl.figure(figsize=(6, 6))
titles = list("ABCDE")
labels = [
list("abcde"), list("12345"), list("uvwxy"),
["one", "two", "three", "four", "five"],
list("jklmn")
]
radar = Radar(fig, titles, labels)
radar.plot([1, 3, 2, 5, 4], "-", lw=2, color="b", alpha=0.4, label="first")
radar.plot([2.3, 2, 3, 3, 2],"-", lw=2, color="r", alpha=0.4, label="second")
radar.plot([3, 4, 3, 4, 2], "-", lw=2, color="g", alpha=0.4, label="third")
radar.ax.legend()
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