Python 求點到直線的垂足

在已知一個點，和一條已知兩個點的直線的情況下

運算公式參考鏈接：https://www.cnblogs.com/mazhenyu/p/3508735.html

def getFootPoint(point, line_p1, line_p2):
    """
    @point, line_p1, line_p2 : [x, y, z]
    """
    x0 = point[0]
    y0 = point[1]
    z0 = point[2]
    
    x1 = line_p1[0]
    y1 = line_p1[1]
    z1 = line_p1[2]
    
    x2 = line_p2[0]
    y2 = line_p2[1]
    z2 = line_p2[2]
    
    k = -((x1 - x0) * (x2 - x1) + (y1 - y0) * (y2 - y1) + (z1 - z0) * (z2 - z1)) / \
        ((x2 - x1) ** 2 + (y2 - y1) ** 2 + (z2 - z1) ** 2)*1.0
    
    xn = k * (x2 - x1) + x1
    yn = k * (y2 - y1) + y1
    zn = k * (z2 - z1) + z1
    
    return (xn, yn, zn)