/// <summary>
/// Returns a new value based on the given values.
/// Tweens the weight with the set sub curve. </summary>
/// <param name="a"> the start value </param>
/// <param name="b"> the end value </param>
/// <param name="t"> the weight which lies between 0.0 and 1.0 </param>
/// <returns> tweened value </returns>
public virtual float Tween(float a, float b, float t)
{
t = TweenSub(0f, 1f, t);
switch (Type)
{
case CurveType.Instant:
return(a);
case CurveType.Linear:
return(Interpolator.Linear(a, b, t));
case CurveType.Quadratic:
return(Interpolator.Quadratic(a, Interpolator.Linear(a, b, Constraints.C1), b, t));
case CurveType.Cubic:
return(Interpolator.Cubic(a, Interpolator.Linear(a, b, Constraints.C1), Interpolator.Linear(a, b, Constraints.C2), b, t));
case CurveType.Quartic:
return(Interpolator.Quartic(a, Interpolator.Linear(a, b, Constraints.C1), Interpolator.Linear(a, b, Constraints.C2), Interpolator.Linear(a, b, Constraints.C3), b, t));
case CurveType.Quintic:
return(Interpolator.Quintic(a, Interpolator.Linear(a, b, Constraints.C1), Interpolator.Linear(a, b, Constraints.C2), Interpolator.Linear(a, b, Constraints.C3), Interpolator.Linear(a, b, Constraints.C4), b, t));
case CurveType.Bezier:
float?cubicSolution = Calculator.SolveCubic(3f * (Constraints.C1 - Constraints.C3) + 1f, 3f * (Constraints.C3 - 2f * Constraints.C1), 3f * Constraints.C1, -t);
if (cubicSolution == null)
{
cubicSolution = lastCubicSolution;
}
else
{
lastCubicSolution = cubicSolution.Value;
}
return(Interpolator.Linear(a, b, Interpolator.Bezier(cubicSolution.Value, 0f, Constraints.C2, Constraints.C4, 1f)));
default:
return(Interpolator.Linear(a, b, t));
}
}
