protected virtual bool IsCollide(ICollisionItem item1, ICollisionItem item2) //todo optimize
{
var topEdge1 = item1.Y + item1.Height;
var rightEdge1 = item1.X + item1.Width;
var leftEdge1 = item1.X;
var bottomEdge1 = item1.Y;
var topEdge2 = item2.Y + item2.Height;
var rightEdge2 = item2.X + item2.Width;
var leftEdge2 = item2.X;
var bottomEdge2 = item2.Y;
return(leftEdge1 < rightEdge2 && rightEdge1 > leftEdge2 && bottomEdge1 < topEdge2 && topEdge1 > bottomEdge2);
}
protected virtual void Collide(ICollisionItem collisionItem)
{
foreach (var sybCollisionItem in _items)
{
if (collisionItem == sybCollisionItem)
{
continue;
}
if (IsCollide(collisionItem, sybCollisionItem))
{
OnCollision(collisionItem, sybCollisionItem);
}
}
}
public virtual void Add(ICollisionItem item)
{
item.CollisionItemChanged += ItemOnCollisionItemChanged;
_items.Add(item);
}
protected virtual void OnCollision(ICollisionItem collisionItem, ICollisionItem sybCollisionItem)
{
collisionItem.OnCollision(sybCollisionItem);
sybCollisionItem.OnCollision(collisionItem);
}
protected virtual void ItemOnCollisionItemChanged(ICollisionItem collisionItem)
{
Collide(collisionItem);
}
public virtual void Remove(ICollisionItem item)
{
item.CollisionItemChanged -= ItemOnCollisionItemChanged;
_items.Remove(item);
}
public virtual void OnCollision(ICollisionItem collisionItem)
{
Collision?.Invoke(this, collisionItem);
}
