/// <summary>
/// 计算弹幕等待时间（按刷新步数）。
/// </summary>
/// <param name="barrage">将要新插入的弹幕。</param>
/// <returns>一个int值，表示经过该值对应的时间后弹幕将显示。</returns>
public int WaitingTime(Barrage barrage)
{
if (queue.Count == 0)
return 0;
Barrage last = queue.Last();
if (last.Speed >= barrage.Speed)
{
int w = last.WaitingTime + last.Width / last.Speed + 1;
return w < 0 ? 0 : w;
}
int diffSpeed = barrage.Speed - last.Speed;
int lastCur = -last.WaitingTime * last.Speed;
int conflict = parent.size.Width - parent.size.Width / barrage.Speed * last.Speed;
if (conflict < lastCur)
return 0;
return (conflict - lastCur) / last.Speed;
}
private void InternalAddBarrage(Barrage barrage)
{
barrage.WaitingTime = 0;
barrage.Speed = speed;
int normalTime = (barrage.Width + size.Width) / speed;
if (normalTime > maxTime)
barrage.Speed = (barrage.Width + size.Width) / maxTime;
int min = 0;
int minWaitingTime = Int32.MaxValue;
for (int i = 0; i < barrageLines.Length; i++)
{
int waitingTime = barrageLines[i].WaitingTime(barrage);
if (waitingTime < minWaitingTime)
{
min = i;
minWaitingTime = waitingTime;
}
}
if (minWaitingTime > maxWait)
return;
barrage.X = size.Width;
barrage.Y = min * barrageHeight;
barrageLines[min].AddBarrage(barrage);
count++;
}
/// <summary>
/// 添加一条新弹幕。弹幕的等待时间将被修改为在该BarrageLine中的等待时间。
/// </summary>
/// <param name="barrage">将要新插入的弹幕。</param>
public void AddBarrage(Barrage barrage)
{
barrage.WaitingTime = WaitingTime(barrage);
queue.Enqueue(barrage);
}
/// <summary>
/// 添加一条新的弹幕评论。
/// </summary>
/// <param name="comment">将要添加的弹幕评论内容。</param>
public void AddBarrage(string comment)
{
if (count >= maxCount || comment.Length > maxLength)
return;
AsyncOperation op = AsyncOperationManager.CreateOperation(Guid.NewGuid());
Thread thread = new Thread(() =>
{
bool entered = false;
Barrage barrage = null;
try
{
entered = Monitor.TryEnter(renderer, maxRenderWait);
if (!entered)
{
Debugger.Log("等待绘制超时: " + comment);
return;
}
Bitmap bitmap = renderer.RenderBarrage(comment, barrageStyle);
barrage = new Barrage(bitmap);
bitmap.Dispose();
}
catch (Exception e)
{
Debugger.Exception(e);
}
finally
{
if (entered)
Monitor.Exit(renderer);
if (barrage != null)
{
op.PostOperationCompleted(o =>
{
InternalAddBarrage(barrage);
Debugger.Log("弹幕: " + comment);
}, null);
}
}
});
thread.Priority = ThreadPriority.BelowNormal;
thread.Start();
}