public void createItems(List <DanmakuItemData> itemDatas)
{
updateLastDanmakuList();
for (int i = 0; i < itemDatas.Count; i++)
{
GameObject go = GameObject.Instantiate(danmakuItemPrefab);
//内容
DanmakuItem item = go.GetComponent <DanmakuItem>();
item.setContent(itemDatas[i]);
DanmakuPositionData positionData = createNewDanmakuPostionData(item);
go.transform.SetParent(displayArea.transform, false);
go.transform.localPosition = getLocalPosition(positionData);
//移动动画
NTween.TweenPosition animation = go.GetComponent <NTween.TweenPosition>();
animation.from = go.transform.localPosition;
animation.to = go.transform.localPosition;
animation.to.x = -(displayArea.rect.width + item.getWidth()) / 2;
//速度和时间
float speed = 50f;
animation.duration = (animation.from.x - animation.to.x) / speed;
animation.PlayForward();
//移出屏幕后消失
animation.onFinishCallback = (tweener) =>
{
tweener.transform.SetParent(null, false);
GameObject.Destroy(tweener.gameObject);
};
}
}
//为新弹幕创建一个位置信息，itemHeight：新弹幕的高度
private DanmakuPositionData createNewDanmakuPostionData(DanmakuItem item)
{
int iter1 = 0;
int iter2 = 0;
int maxEndx = -1;
int finalIter1 = 0;
int finalIter2 = 0;
int itemHeight = item.getHeight();
while (iter1 < _laskDanmakuList.Count && iter2 < _laskDanmakuList.Count)
{
while (iter2 < _laskDanmakuList.Count && _laskDanmakuList[iter1].yTop - _laskDanmakuList[iter2].yBottom < itemHeight)
{
iter2 = iter2 + 1;
}
//查找结束
if (iter2 >= _laskDanmakuList.Count)
{
break;
}
while (iter1 < iter2 && _laskDanmakuList[iter1 + 1].yTop - _laskDanmakuList[iter2].yBottom >= itemHeight)
{
iter1 = iter1 + 1;
}
//最大的endx
int tempMaxEndx = 0;
for (int i = iter1; i <= iter2; i++)
{
if (_laskDanmakuList[i].endX > tempMaxEndx)
{
tempMaxEndx = _laskDanmakuList[i].endX;
}
}
if (maxEndx < 0 || tempMaxEndx < maxEndx)
{
maxEndx = tempMaxEndx;
finalIter1 = iter1;
finalIter2 = iter2;
}
iter2++;
iter1++;
}
//插入数据
DanmakuPositionData data = new DanmakuPositionData();
data.item = item;
data.yTop = _laskDanmakuList[finalIter1].yTop;
data.yBottom = data.yTop - item.getHeight();
data.endX = maxEndx + item.getWidth();
_laskDanmakuList[finalIter2].yTop = data.yBottom;
//删掉被覆盖的部分
if (_laskDanmakuList[finalIter2].yTop == _laskDanmakuList[finalIter2].yBottom)
{
_laskDanmakuList.RemoveAt(finalIter2);
}
iter2 = finalIter2 - 1;
for (; iter2 >= finalIter1; iter2--)
{
_laskDanmakuList.RemoveAt(iter2);
}
_laskDanmakuList.Insert(finalIter1, data);
return(data);
}
//获取弹幕的最右侧相对于展示区域的最右侧的偏移
private int getEndX(DanmakuItem item)
{
int offsetX = (int)(displayArea.rect.width + item.getWidth()) / 2;
return((int)item.transform.localPosition.x - offsetX + item.getWidth());
}