\( \boldsymbol{x}(u, v) = u \hskip 0.1em \begin{pmatrix} \dfrac{a}{2} \\[1ex] \dfrac{b}{2} \\[1ex] v \end{pmatrix} + \begin{pmatrix} \dfrac{a v}{2} \\[1ex] - \dfrac{b v}{2} \\[1ex] 0 \end{pmatrix} \)

\( (- 2 \leq u \leq 2, \, - 2 \leq v \leq 2) \)

\( a = \) , \( b = \) 更新

\( (0.1 \leq a, b \leq 10) \)