旋转一个对象
[helpstring("method Rotate")]
HRESULT Rotate([in] IMxDrawPoint* basePoint, [in] DOUBLE dRotationAngle);| 
参数  | 
说明  | 
| 
[in] IMxDrawPoint* basePoint  | 
旋转基点  | 
| 
[in] DOUBLE dRotationAngle  | 
旋转角度  | 
例如: C#使用例子
        MxDrawDatabase database = (MxDrawDatabase)axMxDrawX1.GetDatabase();
        Int32 id = axMxDrawX1.DrawLine(10, 10, 20, 10);
        MxDrawEntity pEnt = (MxDrawEntity)database.ObjectIdToObject(id);
        MxDrawPoint point = new MxDrawPoint();
        point.x = 10;
        point.y = 10;
        pEnt.Rotate(point, 45 * 3.14159265 / 180.0);
        axMxDrawX1.ZoomAll();