/// <summary>
/// Function to interpolate a new key frame from the nearest previous and next key frames.
/// </summary>
/// <param name="keyValues">Nearest previous and next key frames.</param>
/// <param name="keyTime">The time to assign to the key.</param>
/// <param name="unitTime">The time, expressed in unit time.</param>
/// <returns>
/// The interpolated key frame containing the interpolated values.
/// </returns>
protected override IKeyFrame GetTweenKey(ref NearestKeys keyValues, float keyTime, float unitTime)
{
var next = (GorgonKeyUInt32)keyValues.NextKey;
var prev = (GorgonKeyUInt32)keyValues.PreviousKey;
switch (InterpolationMode)
{
case TrackInterpolationMode.Linear:
return(new GorgonKeyUInt32(keyTime, (UInt32)(prev.Value + (next.Value - prev.Value) * unitTime)));
case TrackInterpolationMode.Spline:
return(new GorgonKeyUInt32(keyTime, (UInt32)Spline.GetInterpolatedValue(keyValues.PreviousKeyIndex, unitTime).X));
default:
return(prev);
}
}
/// <summary>
/// Function to interpolate a new key frame from the nearest previous and next key frames.
/// </summary>
/// <param name="keyValues">Nearest previous and next key frames.</param>
/// <param name="keyTime">The time to assign to the key.</param>
/// <param name="unitTime">The time, expressed in unit time.</param>
/// <returns>
/// The interpolated key frame containing the interpolated values.
/// </returns>
protected override IKeyFrame GetTweenKey(ref NearestKeys keyValues, float keyTime, float unitTime)
{
var prev = (GorgonKeyTexture2D)keyValues.PreviousKey;
if (InterpolationMode != TrackInterpolationMode.Linear)
{
return(prev);
}
var next = (GorgonKeyTexture2D)keyValues.NextKey;
var regionStart = new Vector4(prev.TextureRegion.X, prev.TextureRegion.Y, prev.TextureRegion.Width, prev.TextureRegion.Height);
var regionEnd = new Vector4(next.TextureRegion.X, next.TextureRegion.Y, next.TextureRegion.Width, next.TextureRegion.Height);
Vector4 result;
Vector4.Lerp(ref regionStart, ref regionEnd, unitTime, out result);
return(new GorgonKeyTexture2D(keyTime, prev.Value, new RectangleF(result.X, result.Y, result.Z, result.W)));
}
/// <summary>
/// Function to retrieve a key frame for a given time.
/// </summary>
/// <param name="time">Time to look up.</param>
/// <returns>A keyframe at that time. Note that this can return an interpolated key frame and therefore not actually exist in the <see cref="GorgonLibrary.Animation.GorgonAnimationTrack{T}.KeyFrames">key frames collection</see>.</returns>
public IKeyFrame GetKeyAtTime(float time)
{
IKeyFrame result;
if (KeyFrames.Times.TryGetValue(time, out result))
{
return(result);
}
if (time >= KeyFrames[KeyFrames.Count - 1].Time)
{
return(KeyFrames[KeyFrames.Count - 1]);
}
if (time <= 0)
{
return(KeyFrames[0]);
}
var keys = new NearestKeys(this, time);
return(keys.KeyTimeDelta.EqualsEpsilon(0.0f) ? keys.PreviousKey : GetTweenKey(ref keys, time, keys.KeyTimeDelta));
}
/// <summary> /// Function to interpolate a new key frame from the nearest previous and next key frames. /// </summary> /// <param name="keyValues">Nearest previous and next key frames.</param> /// <param name="keyTime">The time to assign to the key.</param> /// <param name="unitTime">The time, expressed in unit time.</param> /// <returns>The interpolated key frame containing the interpolated values.</returns> protected abstract IKeyFrame GetTweenKey(ref NearestKeys keyValues, float keyTime, float unitTime);
