private Vector2d ComputeSpline(Vector2d begin, Vector2d control1, Vector2d control2, Vector2d end, double tween)
{
if (curveType == Key.KeyType.Custom)
{
Vector2d A1 = Vector2d.Lerp(begin, control1, tween);
Vector2d A2 = Vector2d.Lerp(control1, control2, tween);
Vector2d A3 = Vector2d.Lerp(control2, end, tween);
Vector2d B1 = Vector2d.Lerp(A1, A2, tween);
Vector2d B2 = Vector2d.Lerp(A2, A3, tween);
return(Vector2d.Lerp(B1, B2, tween));
}
else
{
return(new Vector2d(tween, Key.EaseCurve(curveType, tween, control1.X, control1.Y, control2.X, control2.Y)));
}
}
public double Tween(double tweenFactor)
{
Key first = Keys[0];
Key last = Keys[0];
//walk list and tween keys
foreach (Key key in Keys.Values)
{
if (key.Time > first.Time && key.Time < tweenFactor)
{
first = key;
last = first;
}
if (key.Time >= tweenFactor)
{
last = key;
break;
}
}
if (last.Time < tweenFactor)
{
first = last;
}
//todo add support for multiple curves
double keyTween = 0;
if (last.Time != first.Time)
{
keyTween = (tweenFactor - first.Time) / (last.Time - first.Time);
}
keyTween = last.EaseCurve(keyTween);
switch (last.BaseTweenType)
{
case BaseTweenType.Constant:
return(first.Value);
case BaseTweenType.Power:
return(Math.Pow(2, Math.Log(last.Value, 2) * keyTween + Math.Log(first.Value, 2) * (1.0 - keyTween)));
case BaseTweenType.Linear:
break;
case BaseTweenType.Log:
break;
case BaseTweenType.Boolean:
break;
case BaseTweenType.PlanetID:
return(last.Value == first.Value ? last.Value : 20);
default:
break;
}
return((first.Value * (1 - keyTween)) + (last.Value * keyTween));
}