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Make radar charts with matplotlib
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''' | |
# forked from https://gist.github.com/sergiobuj/6721187 | |
## Usage: | |
import matplotlib.pyplot as plt | |
from radar import get_radar_graph | |
labels = ['v1', 'v2', 'v3', 'v4', 'v5', 'v6', 'v7', 'v8', 'v9'] | |
values = [1, 1, 2, 7, 4, 0, 3, 10, 6] | |
maxval = 10 | |
ax, theta = get_radar_graph(labels, maxval) | |
ax.plot(theta, values, color='b') | |
plt.show() | |
## Notes | |
png resolution: change the resolution to 'x' in the last line like: plt.savefig("radar.png", dpi=x) | |
''' | |
import numpy as np | |
import matplotlib.pyplot as plt | |
from matplotlib.path import Path | |
from matplotlib.spines import Spine | |
from matplotlib.projections.polar import PolarAxes | |
from matplotlib.projections import register_projection | |
def _radar_factory(num_vars): | |
theta = 2*np.pi * np.linspace(0, 1-1./num_vars, num_vars) | |
theta += np.pi/2 | |
def unit_poly_verts(theta): | |
x0, y0, r = [0.5] * 3 | |
verts = [(r*np.cos(t) + x0, r*np.sin(t) + y0) for t in theta] | |
return verts | |
class RadarAxes(PolarAxes): | |
name = 'radar' | |
RESOLUTION = 1 | |
def fill(self, *args, **kwargs): | |
closed = kwargs.pop('closed', True) | |
return super(RadarAxes, self).fill(closed=closed, *args, **kwargs) | |
def plot(self, *args, **kwargs): | |
lines = super(RadarAxes, self).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.concatenate((x, [x[0]])) | |
y = np.concatenate((y, [y[0]])) | |
line.set_data(x, y) | |
def set_varlabels(self, labels): | |
self.set_thetagrids(theta * 180/np.pi, labels) | |
def _gen_axes_patch(self): | |
verts = unit_poly_verts(theta) | |
return plt.Polygon(verts, closed=True, edgecolor='k') | |
def _gen_axes_spines(self): | |
spine_type = 'circle' | |
verts = unit_poly_verts(theta) | |
verts.append(verts[0]) | |
path = Path(verts) | |
spine = Spine(self, spine_type, path) | |
spine.set_transform(self.transAxes) | |
return {'polar': spine} | |
register_projection(RadarAxes) | |
return theta | |
def get_radar_graph(labels, maxval = -1): | |
''' | |
Create a blank radar plot for len(labels) variables | |
If maxval is passed, each axis will go up to maxval | |
''' | |
# prep the the radar plot | |
N = len(labels) | |
theta = _radar_factory(N) | |
# create the plot | |
fig = plt.figure() | |
ax = fig.add_subplot(1, 1, 1, projection='radar') | |
ax.set_varlabels(labels) | |
# if a max value was given, | |
# plot a regular black polygon of the max values | |
if maxval > 0: | |
maxdata = [maxval for i in range(N)] | |
ax.plot(theta, maxdata, color='k') | |
return (ax, theta) |
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