Envelope 轉為Polygon

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                        IEnvelopePtr ipEnv ;                        hr = m_ipMapCtrl ->TrackRectangle(& ipEnv);                         IPointPtr ipPointUL ;                         IPointPtr ipPointUR ;                         IPointPtr ipPointLL ;                         IPointPtr ipPointLR ;                         ipEnv->get_UpperLeft (&ipPointUL);                         ipEnv->get_UpperRight (&ipPointUR);                         ipEnv->get_LowerLeft (&ipPointLL);                         ipEnv->get_LowerRight (&ipPointLR);                         IPointCollectionPtr ipPointCollection (CLSID_Polygon);                         ipPointCollection->AddPoint (ipPointUL);                         ipPointCollection->AddPoint (ipPointLL);                         ipPointCollection->AddPoint (ipPointLR);                         ipPointCollection->AddPoint (ipPointUR);                         ipGeo=ipPointCollection ;

Envelope 轉為Polygon