AcDbRegion面域交集布尔运算简单实例

        ads_name ss;
        struct resbuf *rb=acutBuildList(RTDXF0,_T("REGION"),RTNONE);
        acutPrintf(_T("\n请选择两个需要布尔运算(交集)的面域: "));
        if(RTNORM != acedSSGet(NULL,NULL,NULL,rb,ss))
        {
            acutRelRb(rb);
            return;
        }
        acutRelRb(rb);
        Adesk::Int32 nssLen=0;
        acedSSLength(ss,&nssLen);
        if(nssLen<2)
        {
            acedSSFree(ss);
            return;
        }
        ads_name ent;
        acedSSName(ss,0,ent);
        AcDbObjectId objId1;
        acdbGetObjectId(objId1,ent);
        acedSSName(ss,1,ent);
        AcDbObjectId objId2;
        acdbGetObjectId(objId2,ent);
        acedSSFree(ss);
        //使用ARX智能指针写打开面域对象
        AcDbObjectPointer<AcDbRegion>pRegion1(objId1,AcDb::kForWrite);
        if (Acad::eOk != pRegion1.openStatus())
        {
            return;
        }
        AcDbObjectPointer<AcDbRegion>pRegion2(objId2,AcDb::kForWrite);
        if (Acad::eOk != pRegion2.openStatus())
        {
            return;
        }
        //执行布尔操作
        Acad::ErrorStatus es= pRegion1->booleanOper(AcDb::kBoolIntersect,pRegion2);
        if (Acad::eOk != eOk)
        {
            acutPrintf(_T("\n布尔操作失败!,错误码:%s"),acadErrorStatusText(es));
            return;
        }
        //判断是否有交集，如果为空,则删除对象。       
        if (pRegion1->isNull())
        {
            acutPrintf(_T("\n没有交集,删除对象!"));
            pRegion1->erase();
            pRegion2->erase();
            return;
        }
        //删除多余的面域实体，执行交集布尔运算后，参数计算的面域面积为0。
        if (pRegion2->isNull())
        {
            pRegion2->erase();
        }
        
        //打开当前数据库的当前块表记录
        AcDbBlockTableRecordPointer pBlkRcd(curDoc()->database()->currentSpaceId(),AcDb::kForWrite);
        if (Acad::eOk != pBlkRcd.openStatus())
        {
            acutPrintf(_T("\n打开块表记录失败!,错误码:%s"),acadErrorStatusText(pBlkRcd.openStatus()));
            return;
        }
        //分解面域
        AcDbVoidPtrArray ptrArray;
        es = pRegion1->explode(ptrArray);
        if(Acad::eOk != es)
        {
            acutPrintf(_T("\n面域分解操作失败!,错误码:%s"),acadErrorStatusText(es));
            return;
        }
        //遍历添加分解后的实体到当前空间,如果不加入数据库就需要自己delete分解后的对象
        for (int i=0;i<ptrArray.length();i++)
        {
            AcDbEntity*pEnt=(AcDbEntity*)ptrArray.at(i);
            if (pEnt!=NULL)
            {   
                if (pEnt->isKindOf(AcDbRegion::desc()))
                {
                    AcDbVoidPtrArray subptrArray;
                    es = pEnt->explode(subptrArray);
                    if(Acad::eOk != es)
                    {
                        acutPrintf(_T("\n子面域分解操作失败!,错误码:%s"),acadErrorStatusText(es));
                        continue;
                    }
                    for (int j=0;j<subptrArray.length();j++)
                    {
                        AcDbEntity*pSubEnt=(AcDbEntity*)subptrArray.at(j);
                        if (pSubEnt!=NULL)
                        {
                            pBlkRcd->appendAcDbEntity(pSubEnt);
                            //关闭pSubEnt对象
                            pSubEnt->close();
                        }
                    }
                }
                else
                {
                    pBlkRcd->appendAcDbEntity(pEnt);
                }
                //关闭pEnt对象
                pEnt->close();
            }            
        }
        //删除面域
        //pRegion1->erase();
        /*
        //获取拉伸点集合，(另类的获取面域端点的方式)
        AcGePoint3dArray pts;
        pRegion1->getStretchPoints(pts);
        if (pts.length()>0)
        {
            for (int i=0;i<pts.length();i++)
            {
                AcGePoint3d pt=pts.at(i);
                acutPrintf(_T("\n x=%lf,y=%lf,z=%lf"),pt.x,pt.y,pt.z);
            }
        }
        */