private void OnTriggerEnter2D(Collider2D collision)
{
VectorCollider vc = collision.gameObject.GetComponent <VectorCollider>();
if (vc != null)
{
movementVector = vc.vector;
}
}
/// <summary>
/// Check if vector (line segment) collide with a circunference in space and return the first point of the intersection
/// </summary>
/// <param name="vector"></param>
/// <param name="circle"></param>
/// <param name="intersecPoint"></param>
/// <returns></returns>
public bool CheckCollision(VectorCollider vector, CircleCollider circle, out Vector2 intersecPoint)
{
float a;
float b;
float c;
intersecPoint = Vector2.Zero;
a = Vector2.Dot(vector.Vector, vector.Vector);
b = Vector2.Dot(vector.Start - circle.center, vector.Vector) * 2;
c = Vector2.Dot(vector.Start - circle.center, vector.Start - circle.center) - circle.Radius * circle.Radius;
double sqrtTerm = b * b - 4 * a * c;
if (sqrtTerm < 0)
{
return(false);
}
else
{
sqrtTerm = Math.Sqrt(sqrtTerm);
float t1 = (float)(-b - sqrtTerm) / (2 * a);
float t2 = (float)(-b + sqrtTerm) / (2 * a);
//t1 has preference, but if the starting point is inside the circle t2 will be the point
if (t1 >= 0 && t2 <= 1)
{
intersecPoint = vector.Start + t1 * vector.Vector;
return(true);
}
if (t2 >= 0 && t2 <= 1)
{
intersecPoint = vector.Start + t2 * vector.Vector;
return(true);
}
return(false);
}
}
/// <summary>
/// Check if 2 vectors collide in space and return the point of the intersection
/// </summary>
/// <param name="vector1">First VectorCollider to test</param>
/// <param name="vector2">Second VectorCollider to test</param>
/// <param name="intersecPoint">Var to store the intersection Point</param>
/// <returns></returns>
public bool CheckCollision(VectorCollider vector1, VectorCollider vector2, out Vector2 intersecPoint)
{
var div = (vector1.Vector.X * vector2.Vector.Y - vector1.Start.Y * vector2.Vector.X);
intersecPoint = Vector2.Zero;
if (div == 0)
{
return(false);
}
var t1 = (vector2.Vector.Y * (vector2.Start.X - vector1.Start.X) - vector2.Vector.X * (vector2.Start.Y - vector1.Start.Y)) / div;
var t2 = (vector1.Vector.Y * (vector2.Start.X - vector1.Start.X) - vector1.Vector.X * (vector2.Start.Y - vector1.Start.Y)) / div;
if (t2 >= 0 && t2 <= 1 && t1 >= 0 && t1 <= 1)
{
intersecPoint = vector2.Start + t2 * vector2.Vector;
return(true);
}
else
{
return(false);
}
}
