5

I'm trying to fill in the space between two lines that aren't closed at both ends. I can't get plt.fill_between with plt.polar, any ideas? Here's the code I'm using to draw the lines:

import matplotlib.pyplot as plt
import numpy as np 

inner_offset = 0.05
r = np.arange(inner_offset,1. + inner_offset,1./720.)
theta = np.arange(0.,2.,1./360.)*np.pi 

plt.polar(theta/2.,r) #first part of spiral
plt.polar((theta/2.)+(np.pi/3.),r)

plt.show()
Saullo G. P. Castro
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user3638358
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1 Answers1

8

Since your radius ("y") is the same, you can use plt.fill_betweenx():

import matplotlib.pyplot as plt
import numpy as np

plt.figure()
inner_offset = 0.05
r = np.arange(inner_offset,1. + inner_offset,1./720.)
theta = np.arange(0.,2.,1./360.)*np.pi

c1 = plt.polar(theta/2.,r, color='b')[0]
x1 = c1.get_xdata()
y1 = c1.get_ydata()
c2 = plt.polar((theta/2.)+(np.pi/3.),r, color='y')[0]
x2 = c2.get_xdata()
y2 = c2.get_ydata()

plt.fill_betweenx(y1, x1, x2, color='g')
plt.show()

giving:

enter image description here

Saullo G. P. Castro
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    Anyone knows how to avoid the fill_between area "crossing" the boundary lines (in this example, the yellow line around r=1 & theta=225°)? – Jan Mar 21 '23 at 13:08