public ControlPointGroup GroupAt(double time, bool addIfNotExisting = false)
{
var newGroup = new ControlPointGroup(time);
int i = groups.BinarySearch(newGroup);
if (i >= 0)
{
return(groups[i]);
}
if (addIfNotExisting)
{
newGroup.ItemAdded += groupItemAdded;
newGroup.ItemRemoved += groupItemRemoved;
groups.Insert(~i, newGroup);
return(newGroup);
}
return(null);
}
