public override Vector2?FindIntersection(HitRay other)
{
float denominator = Length.X * other.Length.Y - other.Length.X * Length.Y;
if (denominator == 0)
{
return(null);
}
float dx = Start.X - other.Start.X;
float dy = Start.Y - other.Start.Y;
float s = (Length.X * dy - Length.Y * dx) / denominator;
float t = (other.Length.X * dy - other.Length.Y * dx) / denominator;
if (s >= 0 && s <= 1 && t >= 0 && t <= 1)
{
return(Start + t * Length);
}
return(null);
}
public override Vector2?FindIntersection(HitRay ray)
{
List <Vector2> intersections = new List <Vector2>(Sides.Length);
foreach (HitRay side in Sides)
{
Vector2?intersection = side.FindIntersection(ray);
if (intersection != null)
{
intersections.Add(intersection.Value);
}
}
switch (intersections.Count)
{
case 0: return(null);
case 1: return(intersections[0]);
default:
intersections.OrderBy(e => (e - ray.Start).LengthSquared());
return(intersections[0]);
}
}
/// <summary> /// Returns null if no intersection. /// </summary> /// <param name="ray"></param> /// <returns></returns> public abstract Vector2?FindIntersection(HitRay ray);
