Jakub, I believe the general approach in the Page Layout is to obtain a reference to the page element of interest (such as the MapFrame), get its geometry, and then retrieve the Envelope for that particular geometry.As an example, I have included a Visual C++ code fragment below extracted from one of the methods we use in our ArcGIS Engine application when interacting with the PageLayoutControl (with all error checking removed).
IMapFramePtr pMapFrame = NULL;
IElementPtr pElement = NULL;
IGeometryPtr pMapFrameGeometry = NULL;
IEnvelopePtr pMapFrameEnvelope = NULL;
HRESULT hr = S_OK;
double dXMin = 0.0;
double dYMin = 0.0;
double dXMax = 0.0;
double dYMax = 0.0;
// QI to get the IElement interface
pElement = pMapFrame;
// Obtain the extent of the MapFrame geometry
hr = pElement->get_Geometry(&pMapFrameGeometry);
hr = pMapFrameGeometry->get_Envelope(&pMapFrameEnvelope);
// Note that the min/max X,Y values are in page units (such as inches, cm, etc.)
hr = pMapFrameEnvelope->QueryCoords(&dXMin, &dYMin, &dXMax, &dYMax);
As another brief example, below is a Visual C++ code fragment that demonstrates one approach for obtaining a reference to the MapFrame element (within the overall Page Layout's graphics container).
IGraphicsContainerPtr pGraphicsContainer = NULL;
IElementPtr pElement = NULL;
IMapFramePtr pMapFrame = NULL;
// Iterate across all the elements in the PageLayoutControl graphics container
pGraphicsContainer = m_pPageLayoutControl->GetGraphicsContainer();
ASSERT(pGraphicsContainer != NULL);
if (pGraphicsContainer != NULL)
{
hr = pGraphicsContainer->Reset();
hr = pGraphicsContainer->Next(&pElement);
// Examine the next page element, only being interested in MapFrame elements for this method
while (pElement != NULL)
{
// QI to determine if this graphic element is the MapFrame
pMapFrame = pElement;
if (pMapFrame != NULL)
{
// ... processing for the MapFrame element
}
hr = pGraphicsContainer->Next(&pElement);
}
I hope this helps.Scott
