1.        0.        1.
    8
    1    1    5    4
    2    1    2    5
    3    2    3    5
    4    3    6    5
    5    5    6    9
    6    5    9    8
    7    5    8    7
    8    4    5    7
    9
    1       0.0       0.0
    4       0.0       1.0
    7       0.0       2.0
    2       1.0       0.0
    5       1.0       1.0
    8       1.0       2.0
    3       2.0       0.0
    6       2.0       1.0
    9       2.0       2.0
    8
    3    1       0.0
    2    1       0.0
    1    1       0.0
    4    1       0.0
    7    1       0.0
    8    1 0.7071068
    9    1       1.0
    6    2       0.0