ELLIPSESELEC是一个交互式鼠标选择的椭圆绘制工具。HE = ELLIPSESELECT( init , A, B, X0, Y0, PHI, STYLE).初始化回调函数，创建一个椭圆，并返回句柄HE-ELLIPSE SELECT is an interactive mouse to　the ellipse drawing tool. HE = ELLIPSESELECT (　init , A, B, X0, Y0, PHI, STYLE). Initialization callback function, create an oval, and returns a handle to HE