//---------------------------------------------------------------------
public bool MoveNext()
{
if (atEnd)
return false;
if (moveNextNotCalled) {
InitializeCurrentSite();
moveNextNotCalled = false;
return true;
}
Location nextLocation = RowMajor.Next(currentSite.Location, landscape.Columns);
if (nextLocation.Row > landscape.Rows) {
atEnd = true;
return false;
}
if (currentSite.IsActive) {
// current site is the active site etor's Current property
// so advance etor to next active site.
if (activeSiteEtor.MoveNext()) {
// There is one or more active sites remaining.
nextActiveSite = activeSiteEtor.Current;
if (nextLocation == nextActiveSite.Location) {
// Leave current site pointing to active site etor
}
else {
// Next site is inactive.
currentSite = inactiveSite;
inactiveSite.SetLocation(nextLocation);
}
}
else {
// No more active sites left to visit, so next site is
// inactive.
nextActiveSite = null;
currentSite = inactiveSite;
inactiveSite.SetLocation(nextLocation);
}
}
else {
// Current site is inactive
if (nextActiveSite != null && nextLocation == nextActiveSite.Location)
currentSite = nextActiveSite;
else {
// Leave current site pointing to the local inactive site
// instance, and just change its location.
inactiveSite.SetLocation(nextLocation);
}
}
return true;
}
//---------------------------------------------------------------------
private void InitializeCurrentSite()
{
if (activeSiteEtor.MoveNext()) {
nextActiveSite = activeSiteEtor.Current;
if (nextActiveSite.Location == new Location(1,1))
currentSite = nextActiveSite;
else
currentSite = inactiveSite;
}
else {
// No active sites
currentSite = inactiveSite;
}
}
