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Fix Radar Chart Gridlines for Non-Circular Charts #22458

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merged 1 commit into from Feb 13, 2022
Merged

Fix Radar Chart Gridlines for Non-Circular Charts #22458

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13 changes: 12 additions & 1 deletion examples/specialty_plots/radar_chart.py
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Expand Up @@ -42,11 +42,22 @@ def radar_factory(num_vars, frame='circle'):
# 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'
# use 1 line segment to connect specified points
RESOLUTION = 1
PolarTransform = RadarTransform

def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
Expand Down Expand Up @@ -175,7 +186,7 @@ def example_data():
horizontalalignment='center', verticalalignment='center')
for d, color in zip(case_data, colors):
ax.plot(theta, d, color=color)
ax.fill(theta, d, facecolor=color, alpha=0.25)
ax.fill(theta, d, facecolor=color, alpha=0.25, label='_nolegend_')
ax.set_varlabels(spoke_labels)

# add legend relative to top-left plot
Expand Down