要重写的 AcDbEntity 函数 
从以下位置派生自定义类时,必须重写以下函数:AcDbEntity virtual Adesk::Boolean      
subWorldDraw(
    AcGiWorldDraw* mode);
 
virtual Acad::ErrorStatus   
subGetGeomExtents(
    AcDbExtents& extents) const;
 
virtual Acad::ErrorStatus   
subTransformBy(
    const AcGeMatrix3d& xform);
 
virtual Acad::ErrorStatus   
subGetTransformedCopy(
    const AcGeMatrix3d& xform,
    AcDbEntity*& ent) const;
 
virtual Acad::ErrorStatus   
subGetGripPoints(
    AcGePoint3dArray& gripPoints,
    AcDbIntArray&  osnapModes,
    AcDbIntArray&  geomIds) const;
 
virtual Acad::ErrorStatus 
subMoveGripPointsAt( 
    const AcDbIntArray& indices,
    const AcGeVector3d& offset);
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