public:

// - ArxProject2.partLine command (do not rename)

static void ArxProject2partLine(void)

{

// Add your code for command ArxProject2.partLine here

ads_name entName;

ads_point pt;

acedEntSel( _T("\n选择："),entName,pt);//得到选中的实体

AcDbObjectId ObjId;//得到实体ID

if( acdbGetObjectId(ObjId,entName) != Acad::eOk )//如果没有选中的实体则返回

{

acutPrintf( _T("\nno"));

return;

}

AcDbEntity* pEnt;//得到实体

if( acdbOpenObject(pEnt,ObjId,AcDb::kForRead) == Acad::eOk)

{

acutPrintf( _T("\nok"));

AcDbLine* pLine = (AcDbLine* )pEnt;//强制转换

AcGePoint3d ptStart = pLine->startPoint();//得到起点

AcGePoint3d ptEnd = pLine->endPoint();

pEnt->close();

//根据点和线的方向生成点组，绘制线段

int nPart = 5;//五等分

AcGeVector3d Vect = (ptEnd - ptStart)/nPart;//矩阵，点与点的差集平分可得到

for (int n=0; n

{

AcDbObjectId ObjIdNew;

MakeLine(ptStart+n*Vect,ptStart+(n+1)*Vect,ObjIdNew);//等分线段的方法

}

//将选中的线段删除，

if( acdbOpenObject(pEnt,ObjId,AcDb::kForWrite) == Acad::eOk )

{

pEnt->erase();

pEnt->close();

}

}

}

//将实体添加到数据库

//cad中的实体最终都要添加到数据库中才能被显示(图纸其实是一个数据库格式的)，所以它的作用就是添加实体到数据库中

static Acad::ErrorStatus AddToDb(AcDbEntity* ent, AcDbObjectId& objId)

{

Acad::ErrorStatus      es;

AcDbBlockTable*        pBlockTable;

AcDbBlockTableRecord*  pSpaceRecord;

if ((es = acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead))

!= Acad::eOk) {

return es;

}

if ((es = pBlockTable->getAt(ACDB_MODEL_SPACE,

pSpaceRecord,

AcDb::kForWrite)) != Acad::eOk) {

return es;

}

if ((es = pBlockTable->close()) != Acad::eOk) {

return es;

}

if ((es = pSpaceRecord->appendAcDbEntity(objId, ent)) != Acad::eOk) {

return es;

}

return pSpaceRecord->close();

}

private://画线函数

static void MakeLine(AcGePoint3d ptStart,AcGePoint3d ptEnd,AcDbObjectId lineId)

{

AcDbLine *pLine = new AcDbLine(ptStart,ptEnd);

if(AddToDb(pLine,lineId)!=Acad::eOk)//传入指针，传出id

AfxMessageBox( _T("加入实体到数据库失败！"));

pLine->close();

}