void frgExtractTopologicalEntsFromLinesAlgm::_extract_vertices_from_lines(std::vector<Vertex2dsOnSegment2d> &seg_pnts_pairs,
	const AcDbObjectIdArray &ids)
{
	AcDbEntity *entity = NULL;
	acedSetStatusBarProgressMeter(_T("正在提取每根线段上的节点..."), 0, ids.length());
	for (int i = 0; i < ids.length(); i++)
	{
		acdbOpenAcDbEntity(entity, ids[i], AcDb::kForRead);
		if (entity == NULL)
			continue;

		if (entity->isA() != AcDbLine::desc())
		{
			entity->close();
			continue;
		}
		AcDbLine *line = (AcDbLine *)entity;

		Vertex2dsOnSegment2d stru;
		stru.seg.set(AcGePoint2d(line->startPoint().x, line->startPoint().y),
			AcGePoint2d(line->endPoint().x, line->endPoint().y));
		entity->close();

		_extract_from_seg(stru);
		seg_pnts_pairs.push_back(stru);
		acedSetStatusBarProgressMeterPos(i);
	}
	acedRestoreStatusBar();
}
void
ArxDbgDbAdeskLogo::getReferenceAttachmentPoint(AcDbEntity* ent, AcGePoint3d& toPt)
{
	AcDbCircle* circ;
	AcDbArc* arc;
	AcDbLine* line;
	AcDbPoint* point;
	AcDbBlockReference* blkRef;
	
	if ((circ = AcDbCircle::cast(ent)) != NULL)
		toPt = circ->center();
	else if ((arc = AcDbArc::cast(ent)) != NULL)
		toPt = arc->center();
	else if ((line = AcDbLine::cast(ent)) != NULL)
		toPt = line->startPoint();
	else if ((point = AcDbPoint::cast(ent)) != NULL)
		toPt = point->position();
	else if ((blkRef = AcDbBlockReference::cast(ent)) != NULL)
		toPt = blkRef->position();
	else {
			// can't get anything better so just rely on the ECS.  If the
			// raw AutoCAD entities would do this, we wouldn't need the above
			// switch statement.
		AcGeMatrix3d mat;
		ent->getEcs(mat);

		AcGeVector3d v1, v2, v3;
		mat.getCoordSystem(toPt, v1, v2, v3);
	}
}