void CTestVc2005Dlg::CustomEntity_ExplodeMxdrawxctrl1(LPDISPATCH pCustomEntity, LPDISPATCH pDraw, long* pRet)
    {
        // TODO: 在此处添加消息处理程序代码

        *pRet = 1;
        IMxDrawCustomEntityPtr spDrawData;
        pCustomEntity->QueryInterface(&spDrawData);

        IMxDrawWorldDrawPtr spWordDraw;
        pDraw->QueryInterface(&spWordDraw);

        CString sGuid = spDrawData->Guid;
        if(sGuid == MX_CUSTOM_ENTITY_ID)
        {
            if(spDrawData->IsHave(_T("ept") )  != VARIANT_TRUE)
                return;

            IMxDrawPointPtr stp =  spDrawData->GetPoint(_T("spt"));
            if(stp == NULL)
                return;

            IMxDrawPointPtr ept =  spDrawData->GetPoint(_T("ept"));
            if(ept == NULL)
                return;

            MxDrawXLib::IMxDrawUtilityPtr mxUtility;
            mxUtility.CreateInstance(__uuidof( MxDrawXLib::MxDrawUtility ));


            IMxDrawVector3dPtr vec = ept->SumVector(stp);

            vec->Mult(0.5);

            MxDrawXLib::IMxDrawPointPtr midPt;
            midPt.CreateInstance(__uuidof( MxDrawXLib::MxDrawPoint ));

            midPt->x = stp->x;
            midPt->y = stp->y;
            midPt->Add(vec);

            double dAng = vec->Angle();
            dAng = mxUtility->GetDimAngle(dAng);

            double dDis = 0.0;
            dDis = stp->DistanceTo(ept);

            CString sTxt;
            sTxt.Format(_T("L=%.3lf"),dDis);

            dAng = dAng * 180.0 / 3.14159265;

            vec->RotateByXyPlan(3.14159265 / 2.0);
            vec->Normalize();
            vec->Mult(10);

            stp->Add(vec);
            ept->Add(vec);

            spWordDraw->DrawLine(stp->x,stp->y,ept->x,ept->y);

            vec->Mult(2);

            stp->Sum(vec);
            ept->Sum(vec);

            spWordDraw->DrawLine(stp->x,stp->y,ept->x,ept->y);

            spWordDraw->SetColorIndex(1);

            spWordDraw->MxDrawText(midPt->x,midPt->y,sTxt.AllocSysString(),5,dAng,
                mcHorizontalAlignmentCenter,mcVerticalAlignmentMiddle);

        }
    }