archipack_2d.py 文件源码

def proj_xy(self, t, next=None):
        """
            length of projection of sections at crossing line / circle intersections
            deformation unit vector for profil in xy axis
            so f(x_profile) = position of point in xy plane
        """
        if next is None:
            return self.normal(t).v.normalized(), 1
        v0 = self.normal(1).v.normalized()
        v1 = next.normal(0).v.normalized()
        direction = v0 + v1
        adj = (v0 * self.length) * (v1 * next.length)
        hyp = (self.length * next.length)
        c = min(1, max(-1, adj / hyp))
        size = 1 / cos(0.5 * acos(c))
        return direction.normalized(), min(3, size)