public float GetValue(float time, IAnimationTimer animationTimer, InterpolatorDelegate interpolator)
{
if (!this.keyframes.Any())
{
return(0);
}
KeyValuePair <float, float> minTime = this.keyframes.First();
KeyValuePair <float, float> maxTime = this.keyframes.Last();
float startTime = StartingTime;
time = startTime + AnimationTimer.Value(time, FinishingTime - startTime);
if (time <= minTime.Key)
{
return(minTime.Value);
}
if (time >= maxTime.Key)
{
return(maxTime.Value);
}
KeyValuePair <float, float> prevTime = this.keyframes.First(kf => kf.Key >= time);
KeyValuePair <float, float> succTime = this.keyframes.First(kf => kf.Key > prevTime.Value);
float dt = succTime.Key - prevTime.Key;
float t = (time - prevTime.Key) / dt;
return(interpolator.Invoke(t, prevTime.Value, succTime.Value));
}