public double Sample(double x)
{
if (CubicBezier.AlmostEq(x, 0.0))
{
return(this._y0);
}
if (CubicBezier.AlmostEq(x, 1.0))
{
return(this._y3);
}
double num = this._y3 - this._y0;
return(CubicBezier.AlmostEq(this._x1 * num, this._y1 - this._y0) && CubicBezier.AlmostEq((1.0 - this._x2) * num, this._y3 - this._y2) ? this._y0 + x * num : CubicBezier.CalcBezierY(this.GetTForX(x), this._y0, this._y1, this._y2, this._y3));
}
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));
}