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自定义实体Trim和Extend

Derive from AcDbCurve and implement AcDbCurve virtual members.

Extend

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    virtual Acad::ErrorStatus subGetStretchPoints(
        AcGePoint3dArray& stretchPoints) const;
    virtual Acad::ErrorStatus subMoveStretchPointsAt(
        const AcDbIntArray & indices,
        const AcGeVector3d& offset

实现以上两个函数

Trim

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virtual Acad::ErrorStatus subIntersectWith(const AcDbEntity * ent,
        AcDb::Intersect intType,
        AcGePoint3dArray & points,
        Adesk::GsMarker thisGsMarker,
        Adesk::GsMarker otherGsMarker) const;
    virtual Acad::ErrorStatus subIntersectWith(
        const AcDbEntity* pEnt,
        AcDb::Intersect intType,
        const AcGePlane& projPlane,
        AcGePoint3dArray& points,
        Adesk::GsMarker thisGsMarker = 0,
        Adesk::GsMarker otherGsMarker = 0
    ) const;

实现以上两个函数