TweenSequence< T> constructor
Construct a TweenSequence.
The items
parameter must be a list of one or more
TweenSequenceItems.
There's a small cost associated with building a TweenSequence
so
it's best to reuse one, rather than rebuilding it on every frame,
when that's possible.
Implementation
TweenSequence(List<TweenSequenceItem<T>> items) : assert(items != null), assert(items.isNotEmpty) {
_items.addAll(items);
double totalWeight = 0.0;
for (TweenSequenceItem<T> item in _items)
totalWeight += item.weight;
assert(totalWeight > 0.0);
double start = 0.0;
for (int i = 0; i < _items.length; i += 1) {
final double end = i == _items.length - 1 ? 1.0 : start + _items[i].weight / totalWeight;
_intervals.add(_Interval(start, end));
start = end;
}
}