//Key frame setup based on
//https://github.com/gdkchan/SPICA/blob/42c4181e198b0fd34f0a567345ee7e75b54cb58b/SPICA/Formats/CtrH3D/Animation/H3DFloatKeyFrameGroup.cs
public float GetFrameValue(float frame, float startFrame = 0)
{
if (KeyFrames.Count == 0)
{
return(0);
}
if (KeyFrames.Count == 1)
{
return(KeyFrames[0].Value);
}
STKeyFrame LK = KeyFrames.First();
STKeyFrame RK = KeyFrames.Last();
float Frame = frame - startFrame;
foreach (STKeyFrame keyFrame in KeyFrames)
{
if (keyFrame.Frame <= Frame)
{
LK = keyFrame;
}
if (keyFrame.Frame >= Frame && keyFrame.Frame < RK.Frame)
{
RK = keyFrame;
}
}
if (LK.Frame != RK.Frame)
{
float FrameDiff = Frame - LK.Frame;
float Weight = FrameDiff / (RK.Frame - LK.Frame);
switch (InterpolationType)
{
case STInterpoaltionType.Constant: return(LK.Value);
case STInterpoaltionType.Step: return(LK.Value);
case STInterpoaltionType.Linear: return(InterpolationHelper.Lerp(LK.Value, RK.Value, Weight));
case STInterpoaltionType.Hermite:
return(InterpolationHelper.Herp(
LK.Value, RK.Value,
LK.Slope, RK.Slope,
FrameDiff,
Weight));
}
}
return(LK.Value);
}
public STKeyFrame[] GetFrame(float frame)
{
if (KeyFrames.Count == 0)
{
return(null);
}
STKeyFrame k1 = (STKeyFrame)KeyFrames[0], k2 = (STKeyFrame)KeyFrames[0];
foreach (STKeyFrame k in KeyFrames)
{
if (k.Frame < frame)
{
k1 = k;
}
else
{
k2 = k;
break;
}
}
return(new STKeyFrame[] { k1, k2 });
}