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Octave(or Matlab) sub2ind function convert to python code

I implement Matlab 'strel' function to python language.

I have some difficulty converting to python code.

plz let me know how to convert this function.

I think numpy's ravel_multi_index function equal to sub2ind.

but it dose not work well.

:(

Octave code

degrees = 30
linelen = 5


deg90 = mod (degrees, 90);
if (deg90 > 45)
alpha = pi * (90 - deg90) / 180;
else
alpha = pi * deg90 / 180;
endif
ray = (linelen - 1)/2;

c = round (ray * cos (alpha)) + 1;
r = round (ray * sin (alpha)) + 1;


line = false (r, c);

m = tan (alpha);
x = [1:c];

y = r - fix (m .* (x - 0.5));
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
indexes = sub2ind ([r c], y, x);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


and My python code here.

def strel_line(length,degree):
import numpy as np
from numpy import pi,cos,sin,tan,fix

deg90 = degree % 90
if deg90 > 45:
alpha = pi * (90 - deg90) / 180
else:
alpha = pi * deg90 / 180

center = (length -1) /2

c =int(round (center * cos(alpha)) + 1)
r =int(round (center * sin(alpha)) + 1)

line = np.zeros((r,c),dtype = 'int')
print(line)
m = tan(alpha)
x = np.int64( np.arange(1,c+1) )
y = np.int64(r - fix(np.multiply(m,x-0.5)) )
temp= np.array([r,c])


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