private protected (_CurveNode <T> A, _CurveNode <T> B, float Amount) FindSample(float offset)
{
if (_Keys.Count == 0)
{
return(default(_CurveNode <T>), default(_CurveNode <T>), 0);
}
var(keyA, keyB, amount) = CurveSampler.FindRangeContainingOffset(_Keys.Keys, offset);
return(_Keys[keyA], _Keys[keyB], amount);
}
/// <summary>
/// Sets the outgoing tangent to an existing point.
/// </summary>
/// <param name="offset">The offset of the existing point.</param>
/// <param name="tangent">The tangent value.</param>
public void SetOutgoingTangent(float offset, T tangent)
{
Guard.IsTrue(_Keys.ContainsKey(offset), nameof(offset));
tangent = CloneValue(tangent);
var(keyA, keyB, _) = CurveSampler.FindRangeContainingOffset(_Keys.Keys, offset);
if (keyA == keyB)
{
var a = _Keys[keyA];
a.Degree = 3;
a.OutgoingTangent = tangent;
_Keys[keyA] = a;
}
else
{
var a = _Keys[keyA];
var b = _Keys[keyB];
if (keyA != keyB)
{
if (a.Degree == 1)
{
b.IncomingTangent = GetTangent(a.Point, b.Point);
}
_Keys[keyB] = b;
}
a.Degree = 3;
a.OutgoingTangent = tangent;
_Keys[keyA] = a;
}
}
/// <summary>
/// Sets the incoming tangent to an existing point.
/// </summary>
/// <param name="offset">The offset of the existing point.</param>
/// <param name="tangent">The tangent value.</param>
public void SetIncomingTangent(float offset, T tangent)
{
Guard.IsTrue(_Keys.ContainsKey(offset), nameof(offset));
offset -= float.Epsilon;
var(keyA, keyB, _) = CurveSampler.FindRangeContainingOffset(_Keys.Keys, offset);
var a = _Keys[keyA];
var b = _Keys[keyB];
if (a.Degree == 1)
{
a.OutgoingTangent = GetTangent(a.Point, b.Point);
}
a.Degree = 3;
b.IncomingTangent = tangent;
_Keys[keyA] = a;
_Keys[keyB] = b;
}