public static double[] GetIntersectionAngles(Segment2D line, Arc2D arc)
{
Vector2D delta = line.GetDelta();
double num1 = delta.X * delta.X + delta.Y * delta.Y;
Vector2D vector2D = line.Start - arc.Center;
double num2 = 2.0 * (vector2D.X * delta.X + vector2D.Y * delta.Y);
double num3 = vector2D.X * vector2D.X + vector2D.Y * vector2D.Y - arc.Radius * arc.Radius;
double d = num2 * num2 - 4.0 * num1 * num3;
if (d < 0.0)
{
return(new double[0]);
}
double num4 = System.Math.Sqrt(d);
double num5 = (-num2 - num4) / (2.0 * num1);
List <double> doubleList = new List <double>(2);
AngleIntervalD angleIntervalD = new AngleIntervalD(arc.StartAngle, arc.EndAngle);
if (num5 >= 0.0 && num5 <= 1.0)
{
double x = vector2D.X + delta.X * num5;
double num6 = System.Math.Atan2(vector2D.Y + delta.Y * num5, x);
if (num6 < 0.0)
{
num6 += 2.0 * System.Math.PI;
}
if (angleIntervalD.Contains(num6))
{
doubleList.Add(num6);
}
}
if (num4 != 0.0)
{
double num6 = (-num2 + num4) / (2.0 * num1);
if (num6 >= 0.0 && num6 <= 1.0)
{
double x = vector2D.X + delta.X * num6;
double num7 = System.Math.Atan2(vector2D.Y + delta.Y * num6, x);
if (num7 < 0.0)
{
num7 += 2.0 * System.Math.PI;
}
if (angleIntervalD.Contains(num7))
{
doubleList.Add(num7);
}
}
}
return(doubleList.ToArray());
}
public bool Overlaps(AngleIntervalD other)
{
double num1 = this.double_1 < this.double_0 ? this.double_1 + 2.0 * Math.PI : this.double_1;
double num2 = other.double_1 < other.double_0 ? other.double_1 + 2.0 * Math.PI : other.double_1;
if (this.double_0 - 2.0 * Math.PI <= num2 && num1 - 2.0 * Math.PI >= other.double_0 || this.double_0 <= num2 && num1 >= other.double_0)
{
return(true);
}
if (this.double_0 + 2.0 * Math.PI <= num2)
{
return(num1 + 2.0 * Math.PI >= other.double_0);
}
return(false);
}