八边形各内角线角度

各角关系.png

站在8个顶点，找各自的对应关系。
度数分别为

        [0, -45, -67.5, 90, 67.5, 45, 22.5, 0],
        [-45, 0, 90, 67.5, 45, 22.5, 0, -22.5],
        [-67.5, -90, 0, 45, 22.5, 90, 22.5, 45,],
        [-90, -22.5, -45, 0, 90, 22.5, 45, 67.5],
        [22.5, 45, 67.5, 0, 0, -45, -67.5, 90],
        [-45, -22.5, 0, 22.5, 45, 0, 90, 22.5],
        [-67.5, 0, 22.5, 45, 67.5, 90, 0, -67.5],
        [0, -22.5, -45, -67.5, 90, 67.5, 45, 0]

x轴旋转方向为

        [-1, -1, -1, 1, 1, 1, 1, 1],
        [-1, 1, 1, 1, 1, 1, 1, 1],
        [-1, -1, 1, 1, 1, 1, 1, 1],
        [-1, -1, -1, 1, 1, 1, 1, 1],
        [-1, -1, -1, -1, 1, 1, 1, 1],
        [-1, -1, 1, 1, 1, 1, 1, 1],
        [-1, -1, -1, -1, -1, -1, 1, 1],
        [-1, -1, -1, -1, -1, 1, 1, 1]