public void Intersects(ref BoundingCircle circle, out float?result)
{
Vector2 d = Direction;
Vector2 f = Position - circle.Center;
float a = Vector2.Dot(d, d);
float b = Vector2.Dot(f, d) * 2;
float c = Vector2.Dot(f, f) - circle.Radius * circle.Radius;
float discriminant = b * b - 4 * a * c;
if (discriminant < 0)
{
// No intersection.
result = null;
}
else
{
// Ray didn't totally miss circle,
// so there is a solution to
// the equation.
discriminant = (float)Math.Sqrt(discriminant);
result = (-b - discriminant) / (2 * a);
}
}
public float?Intersects(BoundingCircle circle)
{
float?result;
Intersects(ref circle, out result);
return(result);
}
public Vector2 Distance(BoundingCircle circle)
{
return(PointToLine(Min, Max, circle.Center));
}
public bool Intersects(BoundingCircle circle)
{
float totalRadius = Radius + circle.Radius;
return(Distance(circle).LengthSquared() < totalRadius * totalRadius);
}
public bool Intersects(BoundingCircle value)
{
float totalRadius = value.Radius + Radius;
return(Vector2.DistanceSquared(value.Center, Center) < totalRadius * totalRadius);
}
public bool Intersects(BoundingCircle circle)
{
float totalRadius = Radius + circle.Radius;
return Distance(circle).LengthSquared() < totalRadius * totalRadius;
}
public Vector2 Distance(BoundingCircle circle)
{
return PointToLine(Min, Max, circle.Center);
}
public bool Intersects(BoundingCircle value)
{
float totalRadius = value.Radius + Radius;
return Vector2.DistanceSquared(value.Center, Center) < totalRadius * totalRadius;
}
