private TextureFrame GetFrameForwardBackwardOnce(TimeSpan time)
{
TimeSpan startDelay = TimeSpan.Zero;
for (int i = 0; i < this.frames.Count; i++)
{
TextureFrame frame = this.frames[i];
if (CheckFrameDelay(startDelay, frame, time))
{
return(frame);
}
startDelay += frame.Duration;
}
for (int i = this.frames.Count - 1; i >= 0; i--)
{
TextureFrame frame = this.frames[i];
if (CheckFrameDelay(startDelay, frame, time))
{
return(frame);
}
startDelay += frame.Duration;
}
return(null);
}
/// <summary>
/// Gets a frame according to the specified animation time.
/// </summary>
/// <param name="time">The animation time.</param>
/// <returns>The frame that corresponds to the specified animation time.</returns>
public TextureFrame GetFrameFromTime(TimeSpan time)
{
if (this.frames.Count == 1)
{
return(this.frames[0]);
}
TextureFrame retValue = null;
switch (this.FrameAnimationMode)
{
case FrameAnimationMode.ForwardOnce:
retValue = this.GetFrameForwardOnce(time) ?? this.frames[this.frames.Count - 1];
break;
case FrameAnimationMode.BackwardOnce:
retValue = this.GetFrameBackwardOnce(time) ?? this.frames[0];
break;
case FrameAnimationMode.ForwardLoop:
retValue = this.GetFrameForwardLoop(time);
break;
case FrameAnimationMode.BackwardLoop:
retValue = this.GetFrameBackwardLoop(time);
break;
case FrameAnimationMode.ForwardBackwardOnce:
retValue = this.GetFrameForwardBackwardOnce(time) ?? this.frames[0];
break;
case FrameAnimationMode.ForwardBackwardLoop:
retValue = this.GetFrameForwardBackwardLoop(time);
break;
}
return(retValue);
}
private static bool CheckFrameDelay(TimeSpan startDelay, TextureFrame frame, TimeSpan time)
{
return(startDelay <= time && startDelay + frame.Duration >= time);
}
