ObjectARX中三维多段线转二维多段线的方法

Acad::ErrorStatus

AcDb3dPolylineToAcDb2dPolyline(AcDbObjectId objId, int flag /* =0 */)

{

 

    Acad::ErrorStatus es;

    AcDbEntity *pEnt = NULL;

    double elev = 0.0;

    es = acdbOpenObject(pEnt, objId, AcDb::kForWrite);

    int i = 0;

    if (pEnt->isKindOf(AcDb3dPolyline::desc()))

    {

        AcDb2dPolyline *pNewline = new AcDb2dPolyline();

        AcDb3dPolyline *pPline = AcDb3dPolyline::cast(pEnt);

        AcDbObjectIterator *pItr = pPline->vertexIterator();

 

        for (pItr->start(); !pItr->done(); pItr->step())

        {

            AcDb3dPolylineVertex *pVertex = NULL;

            AcDbObjectId vId = pItr->objectId();

            acdbOpenObject(pVertex, vId, AcDb::kForRead);

            AcDb::Vertex3dType verType = pVertex->vertexType();

            if (verType != AcDb::k3dControlVertex)

            {

                i++;

                AcDb2dVertex *p2dVertex = new AcDb2dVertex(pVertex->position());

                p2dVertex->setXData(pVertex->xData());

                pNewline->appendVertex(p2dVertex);

                p2dVertex->close();

            }

            if (flag == 1)

            {

                elev += pVertex->position().z;

            }

 

            pVertex->close();

        }

        delete pItr;

        pItr = 0;

        double eleva = elev / i;

 

        pNewline->setElevation(eleva);

        pNewline->setPropertiesFrom(pPline);

        if (pPline->isClosed())

        {

            pNewline->makeClosed();

        }

        pNewline->setXData(pPline->xData());

        m_DbUtil.PostToModelSpace(pNewline);

        pPline->erase();

 

    }

    pEnt->close();

 

    return es;

}