private Vector2 EvaluatePiece(SplinePiece piece, float t, bool isFirstPiece)
{
var limits = isFirstPiece ? new Vector2(0, piece.Radian2) : new Vector2(piece.Radian1, 0);
var tt = limits.x + t * (limits.y - limits.x);
return(piece.Center + piece.Axis1 * math.cos(tt) + piece.Axis2 * math.sin(tt));
}
public List <Vector2> Evaluate(Curve curve, IInterpolationFunctionProvider interpolationProvider)
{
if (curve.Points.Count < 3)
{
return(new List <Vector2>());
}
var startIndex = curve.EndType == CurveEndType.Hide ? 0 : 1;
var evaluatedPoints = new List <Vector2>();
SplinePiece previousPiece = null;
for (var i = 0; i < curve.Points.Count - 2; ++i)
{
var piece = interpolationProvider.Interpolate(curve.Points[i], curve.Points[i + 1], curve.Points[i + 2]);
var currentPiece = piece;
if (previousPiece != null && currentPiece != null)
{
for (var j = 0; j < 128; ++j)
{
evaluatedPoints.Add(EvaluateSection(previousPiece, currentPiece, j / 127f));
}
}
previousPiece = piece;
}
return(evaluatedPoints);
}
private Vector2 EvaluateSection(SplinePiece piece1, SplinePiece piece2, float t)
{
var p1 = EvaluatePiece(piece1, t, isFirstPiece: true);
var p2 = EvaluatePiece(piece2, t, isFirstPiece: false);
var weight = math.pow(math.sin(math.PI * 0.5f * t), 2);
return(Vector2.Lerp(p1, p2, weight));
}