public float CalculateKeyframeValue(int time)
{
EMA_Keyframe before = GetKeyframeBefore(time);
EMA_Keyframe after = GetKeyframeAfter(time);
if (before == null)
{
return(0f);
}
if (after == null)
{
after = new EMA_Keyframe()
{
Time = ushort.MaxValue, Value = before.Value
};
}
//Frame difference between previous frame and the current frame (current frame is AFTER the frame we want)
int diff = after.Time - before.Time;
//Keyframe value difference
float keyframe2 = after.Value - before.Value;
//Difference between the frame we WANT and the previous frame
int diff2 = time - before.Time;
//Divide keyframe value difference by the keyframe time difference, and then multiply it by diff2, then add the previous keyframe value
return((keyframe2 / diff) * diff2 + before.Value);
}
/// <summary>
/// Returns the keyframe that appears just before the specified frame
/// </summary>
/// <returns></returns>
public EMA_Keyframe GetKeyframeBefore(int time)
{
SortKeyframes();
EMA_Keyframe prev = null;
foreach (var keyframe in Keyframes)
{
if (keyframe.Time >= time)
{
break;
}
prev = keyframe;
}
return(prev);
}
public void AddKeyframesFromCommand(EMA_Command anim)
{
foreach (var keyframe in anim.Keyframes)
{
var existing = GetKeyframe(keyframe.Time);
if (existing == null)
{
var newKeyframe = new EMA_Keyframe()
{
Time = keyframe.Time, Value = GetValue(keyframe.Time)
};
Keyframes.Add(newKeyframe);
}
}
}
