private float IntersectsWithDistance(Zombie a, IPlayer b)
{
if (a.x < b.X - 16)
return float.NaN;
if (a.x > b.X + 16)
return float.NaN;
if (a.x < b.Y - 16)
return float.NaN;
if (a.x > b.Y + 16)
return float.NaN;
double distance = (a.x - b.X) * (a.x - b.X) + (a.y - b.Y) * (a.y - b.Y);
if (distance <= 16)
return (float)distance;
return float.NaN;
}
private bool Intersects(Zombie a, IPlayer b)
{
return (IntersectsWithDistance(a, b) != float.NaN);
}