fixedzoomin.cpp

在vc环境下

#include "StdAfx.h"
#include ".\fixedzoomin.h"

/////////////////////////////////////////////////////////////////////////////
// CFixedZoomIn

STDMETHODIMP CFixedZoomIn::OnClick()
{
	IActiveViewPtr cpActiveView;

	GetFocusMapActiveView(&cpActiveView);

	IEnvelopePtr cpEnvelope;
	cpActiveView->get_Extent(&cpEnvelope);

	cpEnvelope->Expand( 0.75, 0.75, VARIANT_TRUE );

	cpActiveView->put_Extent(cpEnvelope);
	cpActiveView->Refresh();

	return S_OK;
}