start method
Implementation
Tweener start([time]) {
Tweener.setup();
Tweener.add(this);
_startTime =
time != null ? time : new DateTime.now().millisecondsSinceEpoch;
_startTime += _delayTime;
for (var property in _valuesEnd.keys) {
if (_object[property] == null) {
continue;
}
_valuesStart[property] = _object[property];
}
return this;
}