[求助]：关于拖动多义线时worldDraw函数重载的问题

seu

我在用AcedJig实现拖动一个2dpolyline的实体时，重载了worldDraw函数，但是在CAD中执行时，总是提示
(Two vertices were added to a 2D pline (0) which had no vertices.)
请教这到底是什么问题，3x

virtual Adesk::Boolean worldDraw(AcGiWorldDraw* mode)
{
        Adesk::Boolean es = Adesk::kTrue;

        mode->subEntityTraits().setColor(7);
        AcDbEntity *pEntity = NULL;
        AcDbEntity *pDraw = NULL;
        es = acdbOpenAcDbEntity(pEntity, Id, AcDb::kForRead);
        if(es != Acad::eOk)
                return es;

        pDraw = AcDbEntity::cast(pEntity->clone());
        //pDraw = (AcDbEntity*)(pEntity->clone());
        pEntity->close();

        AcGeMatrix3d max;
        max = AcGeMatrix3d(del);

        if(pDraw != NULL)
        {
                es = pDraw->transformBy(max);
                es = mode->geometry().draw(pDraw);
        }
        pDraw->close();
        return es;
}