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);

                                }
                            }