//-----------------------------------------------------------------------------
// Purpose: This functions sets up the list of objects to be clipped.
// Initially the list is passed in (typically a Selection set). On
// subsequent "translation" updates the list is refreshed from the
// m_pOrigObjects list.
// Input: pList - the list of objects (solids) to be clipped
//-----------------------------------------------------------------------------
void Clipper3D::SetClipObjects( CMapObjectList *pList )
{
// check for an empty list
if( !pList )
return;
// save the original list
m_pOrigObjects = pList;
// clear the clip results list
ResetClipResults();
//
// copy solids into the clip list
//
POSITION pos = m_pOrigObjects->GetHeadPosition();
while( pos )
{
CMapClass *pObject = m_pOrigObjects->GetNext( pos );
if( !pObject )
continue;
if( pObject->IsMapClass( MAPCLASS_TYPE( CMapSolid ) ) )
{
AddToClipList( ( CMapSolid* )pObject, this );
}
pObject->EnumChildren( ENUMMAPCHILDRENPROC( AddToClipList ), DWORD( this ), MAPCLASS_TYPE( CMapSolid ) );
}
// the clipping list is not empty anymore
m_bEmpty = FALSE;
}
//-----------------------------------------------------------------------------
// Purpose: Calls an enumerating function for each of our children that are of
// of a given type, recursively enumerating their children also.
// Input : pfn - Enumeration callback function. Called once per child.
// dwParam - User data to pass into the enumerating callback.
// Type - Unless NULL, only objects of the given type will be enumerated.
// Output : Returns FALSE if the enumeration was terminated early, TRUE if it completed.
//-----------------------------------------------------------------------------
BOOL CMapClass::EnumChildren(ENUMMAPCHILDRENPROC pfn, DWORD dwParam, MAPCLASSTYPE Type)
{
POSITION p = Children.GetHeadPosition();
while (p)
{
CMapClass *pChild = Children.GetNext(p);
if (!Type || pChild->IsMapClass(Type))
{
if(!(*pfn)(pChild, dwParam))
{
return FALSE;
}
}
// enum this child's children
if (!pChild->EnumChildren(pfn, dwParam, Type))
{
return FALSE;
}
}
return TRUE;
}
