public static bool Intersects(Ray2LR a, Segment2LR b)
{
if (a.direction.IsZero)
{
return(b.Contains(a.origin));
}
Vector2LR v = new Vector2LR(-a.Direction.Y, a.Direction.X);
if (Vector2LR.DotProduct(b.Start - a.Origin, v).IsPositive == Vector2LR.DotProduct(b.End - a.Origin, v).IsPositive)
{
return(false);
}
if (b.Start == b.End)
{
return(a.Contains(b.Start));
}
Vector2LR delta = b.GetDelta();
LongRational longRational1 = a.Direction.X * delta.Y - a.Direction.Y * delta.X;
if (longRational1.IsZero)
{
return(false);
}
Vector2LR u = b.Start - a.Origin;
LongRational longRational2 = Vector2LR.CrossProduct(u, delta);
if (longRational1.IsPositive)
{
if (longRational2.IsNegative)
{
return(false);
}
}
else if (longRational2.IsPositive)
{
return(false);
}
LongRational longRational3 = Vector2LR.CrossProduct(u, a.Direction);
if (longRational1.IsPositive)
{
if (longRational3.IsNegative || longRational3 > longRational1)
{
return(false);
}
}
else if (longRational3.IsPositive || longRational3 < longRational1)
{
return(false);
}
LongRational longRational4 = longRational3 / longRational1;
LongRational longRational5 = longRational2 / longRational1;
return(true);
}
public bool Intersects(Ray2LR other, out Point2LR?intersection, out bool parallel)
{
if (this.direction.IsZero)
{
parallel = false;
bool flag;
if (flag = other.Contains(this.origin))
{
intersection = new Point2LR?(this.origin);
}
else
{
intersection = new Point2LR?();
}
return(flag);
}
if (other.Direction.IsZero)
{
parallel = false;
bool flag;
if (flag = this.Contains(other.origin))
{
intersection = new Point2LR?(other.origin);
}
else
{
intersection = new Point2LR?();
}
return(flag);
}
LongRational longRational1 = this.direction.X * other.direction.Y - this.direction.Y * other.direction.X;
if (longRational1.IsZero)
{
parallel = true;
bool flag;
if (flag = other.Contains(this.origin))
{
intersection = new Point2LR?(this.origin);
}
else
{
intersection = new Point2LR?();
}
return(flag);
}
parallel = false;
Vector2LR u = other.origin - this.origin;
LongRational longRational2 = Vector2LR.CrossProduct(u, other.direction);
if (longRational1.IsPositive)
{
if (longRational2.IsNegative)
{
intersection = new Point2LR?();
return(false);
}
}
else if (longRational2.IsPositive)
{
intersection = new Point2LR?();
return(false);
}
LongRational longRational3 = Vector2LR.CrossProduct(u, this.direction);
if (longRational1.IsPositive)
{
if (longRational3.IsNegative)
{
intersection = new Point2LR?();
return(false);
}
}
else if (longRational3.IsPositive)
{
intersection = new Point2LR?();
return(false);
}
LongRational longRational4 = longRational2 / longRational1;
intersection = new Point2LR?(this.origin + longRational4 * this.direction);
return(true);
}
public static bool GetIntersectionCoefficients(
Ray2LR a,
Ray2LR b,
out LongRational?p,
out LongRational?q,
out bool parallel)
{
if (a.direction.IsZero)
{
if (b.direction.IsZero)
{
bool flag = a.origin == b.origin;
parallel = false;
if (flag)
{
p = new LongRational?(LongRational.Zero);
q = new LongRational?(LongRational.Zero);
}
else
{
p = new LongRational?();
q = new LongRational?();
}
return(flag);
}
parallel = false;
p = new LongRational?();
bool flag1;
if (flag1 = b.Contains(a.origin))
{
q = new LongRational?(Vector2LR.DotProduct(a.origin - b.origin, b.direction) / b.direction.GetLengthSquared());
}
else
{
q = new LongRational?();
}
return(flag1);
}
if (b.Direction.IsZero)
{
parallel = false;
q = new LongRational?();
bool flag;
if (flag = a.Contains(b.origin))
{
p = new LongRational?(Vector2LR.DotProduct(b.origin - a.origin, a.direction) / a.direction.GetLengthSquared());
}
else
{
p = new LongRational?();
}
return(flag);
}
LongRational longRational1 = a.Direction.X * b.Direction.Y - a.Direction.Y * b.Direction.X;
if (longRational1.IsZero)
{
parallel = true;
if (!a.Contains(b.origin))
{
b.Contains(a.origin);
}
p = new LongRational?();
q = new LongRational?();
return(true);
}
parallel = false;
Vector2LR u = b.origin - a.origin;
LongRational longRational2 = Vector2LR.CrossProduct(u, b.direction);
if (longRational1.IsPositive)
{
if (longRational2.IsNegative)
{
p = new LongRational?();
q = new LongRational?();
return(false);
}
}
else if (longRational2.IsPositive)
{
p = new LongRational?();
q = new LongRational?();
return(false);
}
LongRational longRational3 = Vector2LR.CrossProduct(u, a.direction);
if (longRational1.IsPositive)
{
if (longRational3.IsNegative)
{
p = new LongRational?();
q = new LongRational?();
return(false);
}
}
else if (longRational3.IsPositive)
{
p = new LongRational?();
q = new LongRational?();
return(false);
}
p = new LongRational?(longRational2 / longRational1);
q = new LongRational?(longRational3 / longRational1);
return(true);
}