From matplotlib radar example

plot_radar_results.py

__author__ = 'schien'
import numpy as np

import matplotlib.pyplot as plt
from matplotlib.projections.polar import PolarAxes
from matplotlib.projections import register_projection


def radar_factory(num_vars, frame='circle'):
    """Create a radar chart with `num_vars` axes."""
    # calculate evenly-spaced axis angles
    theta = 2 * np.pi * np.linspace(0, 1 - 1. / num_vars, num_vars)
    # rotate theta such that the first axis is at the top
    theta += np.pi / 2

    def draw_poly_frame(self, x0, y0, r):
        # TODO: use transforms to convert (x, y) to (r, theta)
        verts = [(r * np.cos(t) + x0, r * np.sin(t) + y0) for t in theta]
        return plt.Polygon(verts, closed=True, edgecolor='k')

    def draw_circle_frame(self, x0, y0, r):
        return plt.Circle((x0, y0), r)

    frame_dict = {'polygon': draw_poly_frame, 'circle': draw_circle_frame}
    if frame not in frame_dict:
        raise ValueError, 'unknown value for `frame`: %s' % frame

    class RadarAxes(PolarAxes):
        """Class for creating a radar chart (a.k.a. a spider or star chart)

        http://en.wikipedia.org/wiki/Radar_chart
        """
        name = 'radar'
        # use 1 line segment to connect specified points
        RESOLUTION = 1
        # define draw_frame method
        draw_frame = frame_dict[frame]

        def fill(self, *args, **kwargs):
            """Override fill so that line is closed by default"""
            closed = kwargs.pop('closed', True)
            return super(RadarAxes, self).fill(closed=closed, *args, **kwargs)

        def plot(self, *args, **kwargs):
            """Override plot so that line is closed by default"""
            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):
            x0, y0 = (0.5, 0.5)
            r = 0.5
            return self.draw_frame(x0, y0, r)

    register_projection(RadarAxes)
    return theta


if __name__ == '__main__':
    #The following data is from the Denver Aerosol Sources and Health study.
    #See  doi:10.1016/j.atmosenv.2008.12.017
    #
    #The data are pollution source profile estimates for five modeled pollution
    #sources (e.g., cars, wood-burning, etc) that emit 7-9 chemical species.
    #The radar charts are experimented with here to see if we can nicely
    #visualize how the modeled source profiles change across four scenarios:
    #  1) No gas-phase species present, just seven particulate counts on
    #     Sulfate
    #     Nitrate
    #     Elemental Carbon (EC)
    #     Organic Carbon fraction 1 (OC)
    #     Organic Carbon fraction 2 (OC2)
    #     Organic Carbon fraction 3 (OC3)
    #     Pyrolized Organic Carbon (OP)
    #  2)Inclusion of gas-phase specie carbon monoxide (CO)
    #  3)Inclusion of gas-phase specie ozone (O3).
    #  4)Inclusion of both gas-phase speciesis present...
    N = 6
    theta = radar_factory(N)
    spoke_labels = ['A', 'B', 'C', 'D', 'E', 'F']
    a = [0.88, 0.6, 0.7, 0.3, 0.30, 0.6]  # [6, 7, 5, 6, 8, 4]
    a = np.asarray(a) * 10

    b = [0.5, 0.6, 0.8, 0.7, 0.8, 0.4]
    b = np.asarray(b) * 10

    fig = plt.figure(figsize=(9, 9))
    # adjust spacing around the subplots
    fig.subplots_adjust(wspace=0.25, hspace=0.20, top=0.85, bottom=0.05)
    title_list = ['Basecase']
    data = {'Basecase': [a, b]}
    colors = ['b', 'r']
    # chemicals range from 0 to 1
    radial_grid = [2., 4., 6., 8.]
    # If you don't care about the order, you can loop over data_dict.items()
    for n, title in enumerate(title_list):
        ax = fig.add_subplot(2, 2, n + 1, projection='radar')
        plt.rgrids(radial_grid)
        ax.set_title(title, weight='bold', size='medium', position=(0.5, 1.1),
                     horizontalalignment='center', verticalalignment='center')
        for d, color in zip(data[title], colors):
            ax.plot(theta, d, color=color)
            ax.fill(theta, d, facecolor=color, alpha=0.25)
        ax.set_varlabels(spoke_labels)
    # add legend relative to top-left plot
    plt.subplot(2, 2, 1)
    labels = ('A', 'B')
    legend = plt.legend(labels, loc=(0.9, .95), labelspacing=0.1)
    plt.setp(legend.get_texts(), fontsize='small')
    plt.figtext(0.5, 0.965, 'Result compared A with B',
                ha='center', color='black', weight='bold', size='large')
    plt.show()

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