private double NewtonRaphsonIterate(double aX, double aGuessT, double mX1, double mX2)
{
for (int index = 0; index < 4; ++index)
{
double slopeX = CubicBezier.GetSlopeX(aGuessT, mX1, mX2);
if (Math.Abs(slopeX) < 1E-07)
{
return(aGuessT);
}
double num = CubicBezier.CalcBezierX(aGuessT, mX1, mX2) - aX;
aGuessT -= num / slopeX;
}
return(aGuessT);
}
private double GetTForX(double aX)
{
double aA = 0.0;
int index1 = 1;
for (int index2 = 10; index1 != index2 && this._sampleValues[index1] <= aX; ++index1)
{
aA += 0.1;
}
int index3 = index1 - 1;
double num1 = (aX - this._sampleValues[index3]) / (this._sampleValues[index3 + 1] - this._sampleValues[index3]);
double num2 = aA + num1 * 0.1;
double slopeX = CubicBezier.GetSlopeX(num2, this._x1, this._x2);
return(slopeX < 0.001 ? (!CubicBezier.AlmostEq(slopeX, 0.0) ? CubicBezier.BinarySubdivide(aX, aA, aA + 0.1, this._x1, this._x2) : num2) : this.NewtonRaphsonIterate(aX, num2, this._x1, this._x2));
}
