AbsAnimationGroup constructor

AbsAnimationGroup({ required List<AnimationPart> parts, })

Implementation

AbsAnimationGroup({required List<AnimationPart> parts})
    : assert(parts.isNotEmpty && parts.length > 1,
          "AnimationPart list must be not null and size > 1") {
  _currentXYZ = _initXYZ();
  //动画序列调整
  _parts = parts;
  _parts.sort((a, b) {
    return a.moment.compareTo(b.moment);
  });
  // 第一个起步值是否存在

  // 初始化值设置
  AnimationPart tempPart = AnimationPart(moment: 0);
  tempPart.xyz = _currentXYZ;
  Iterator<AnimationPart> iterator = _parts.iterator;
  while (iterator.moveNext()) {
    AnimationPart animationPart = iterator.current;
    if (animationPart.isAddPart) {
      animationPart.xyz = tempPart.xyz + animationPart.xyzAdd;
    } else {
      Vector3? vector3 = animationPart.xyz;
      if (vector3!.x == double.infinity) vector3.x = tempPart.xyz!.x;
      if (vector3!.y == double.infinity) vector3.y = tempPart.xyz!.y;
      if (vector3!.z == double.infinity) vector3.z = tempPart.xyz!.z;
    }
    tempPart = animationPart;
  }
  //计算得到时长
  _duration = _parts.last.moment;
  _startMoment = _parts.first.moment;
  _endMoment = _duration;
}