public override void Collision(CircleCollider other)
{
if (other.entity.Equals(this.entity))
{
return;
}
// ABVector is the vector between this object and the other object.
Vector2 ABVector = other.center - this.center;
// Distance Between Centers is the distance between the 2 collider centers.
float distanceBetweenCenters = ABVector.Length();
// If this is greater than the sum of the radii, a collision has occured.
if (distanceBetweenCenters <= this.radius + other.radius)
{
// The collision normal is the ABVector, converted into a Unit vector (or normalized)
Vector2 normal = ABVector;
normal.Normalize();
// We correct interpenetration BEFORE physics has a chance to occur.
// The distanceIntersecting is the distance between the centers, minus the sum of the radii.
float distanceIntersecting = (distanceBetweenCenters - (radius + other.radius));
// We push each object along the collision normal as far as they have interpenetrated.
entity.transform.SetPosition(entity.transform.position + (normal * distanceIntersecting));
// Now that we have corrected interpenetration, we call OnCollision on the entity,
// which will perform physics behaviours if it has a PhysicsBody component.
ICollisionListener collisionEntity = entity as ICollisionListener;
collisionEntity.OnCollision(other, normal);
}
}
public void CollisionResolution(CircleCollider other, Vector2 normal)
{
// When two CircleColliders collide, physics occurs.
float cv; // Closing Velocity
if (other.entity.GetComponent <PhysicsBody>() != null)
{
// If the colliding entity has a PhysicsBody, we do physics using both our and their velocity.
PhysicsBody otherPhysics = (PhysicsBody)other.entity.GetComponent <PhysicsBody>();
// We calculate closing velocity by getting the dot product of the closing velocity direction and the collision normal.
cv = restitutionCoefficient * (Vector2.Dot(otherPhysics.velocity - this.velocity, normal));
}
else
{
// If the colliding entity does not have a PhysicsBody, we do physics using only our own velocity.
cv = restitutionCoefficient * (Vector2.Dot(this.velocity * 2, normal));
}
// Then the reflectionVelocity is the closing velocity multiplied by the collision normal.
reflectionVelocity = normal * cv;
// Finally, the reflection velocity is applied to the velocity of this object.
// This happens here, rather than in Update in order to apply the reflection velocity only whilst the objects are colliding.
velocity += reflectionVelocity;
}
public virtual void Collision(CircleCollider other)
{
}
