Easily divided by zero in 45 degrees GDS patterns

[arided02]

Line 153 to 156:
length_ij = np.linalg.norm(normal_ij, axis=1)
length_ik = np.linalg.norm(normal_ik, axis=1)
normal_ij /= np.stack((length_ij, length_ij), axis=1)
normal_ik /= np.stack((length_ik, length_ik), axis=1)
The length_ij and length_ik are easily be zero in offgrid alogn the 45 degrees hypotenuse. Request to add 0.000000001 prevent divided by zero.
length_ij = np.linalg.norm(normal_ij, axis=1)+0.00000001
length_ik = np.linalg.norm(normal_ik, axis=1)+0.00000001
normal_ij /= np.stack((length_ij, length_ij), axis=1)
normal_ik /= np.stack((length_ik, length_ik), axis=1)
To do so, I can easily to translate irregular patterns.