ellipse.py 文件源码

def ellipse_angle_of_rotation2( a ):
    b,c,d,f,g,a = a[1]/2, a[2], a[3]/2, a[4]/2, a[5], a[0]
    if b == 0:
        if a > c:
            return 0
        else:
            return NP.pi/2
    else:
        if a > c:
            return NP.arctan(2*b/(a-c))/2
        else:
            return NP.pi/2 + NP.arctan(2*b/(a-c))/2