Function PyplotRadarChart

DemoPrograms/Demo_Matplotlib_Browser.py:428–612

()

    return fig1

def PyplotRadarChart():
    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, frame='circle'):
        """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)

        def draw_poly_patch(self):
            # rotate theta such that the first axis is at the top
            verts = unit_poly_verts(theta + np.pi / 2)
            return plt.Polygon(verts, closed=True, edgecolor='k')

        def draw_circle_patch(self):
            # unit circle centered on (0.5, 0.5)
            return plt.Circle((0.5, 0.5), 0.5)

        patch_dict = {'polygon': draw_poly_patch, 'circle': draw_circle_patch}
        if frame not in patch_dict:
            raise ValueError('unknown value for `frame`: %s' % frame)

        class RadarAxes(PolarAxes):

            name = 'radar'
            # use 1 line segment to connect specified points
            RESOLUTION = 1
            # define draw_frame method
            draw_patch = patch_dict[frame]

            def __init__(self, *args, **kwargs):
                super(RadarAxes, self).__init__(*args, **kwargs)
                # rotate plot such that the first axis is at the top
                self.set_theta_zero_location('N')

            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"""