/// <summary>
/// Called when seek.
/// </summary>
protected override void OnSeek(TimeSpan currentPosition, TimeSpan previousPosition)
{
float percentage = 0;
float position = (float)(Position.TotalSeconds / Duration.TotalSeconds);
ICurve evaluator = curve ?? Curves.Linear;
if (!float.IsNaN(position))
{
switch (Easing)
{
case Easing.In:
percentage = evaluator.Evaluate(position);
break;
case Easing.Out:
percentage = 1.0f - evaluator.Evaluate(1.0f - position);
break;
case Easing.InOut:
percentage = position < 0.5f ? (0.5f - Curve.Evaluate(1.0f - position * 2) * 0.5f) :
(0.5f + Curve.Evaluate((position - 0.5f) * 2) * 0.5f);
break;
}
}
Value = lerp(from, to, percentage);
if (expression != null)
{
expression.Value = Value;
}
}