/// <summary>
/// Removes the given sprite as a child from this sprite. The given sprite's Parent property must be set to the sprite this method is called on.
/// </summary>
/// <param name="sprite">The sprite to remove as a child of this sprite. The sprite's Parent property must be set to the sprite this method is called on.</param>
protected void removeChild(Sprite sprite)
{
if (sprite.Parent != this)
throw new InvalidOperationException("The given sprite is not a child of this sprite.");
children.Remove(sprite);
sprite.Parent = null;
}
/// <summary>
/// Adds the given sprite as a child to this sprite. The given sprite's Parent property must be set to null.
/// </summary>
/// <param name="sprite">The sprite to make a child of this sprite. The sprite's Parent property must be set to null.</param>
protected void addChild(Sprite sprite)
{
if (sprite == null)
throw new ArgumentNullException(nameof(sprite));
if (sprite.Parent != null)
throw new InvalidOperationException("The given sprite already has a parent.");
sprite.Parent = this;
children.Add(sprite);
}
public void AddChild(Sprite child)
{
addChild(child);
}
public void RemoveChild(Sprite child)
{
removeChild(child);
}
#pragma warning restore CS1591
private void recursiveCollisionCheck(Sprite sprite, double x, double y, Func<Sprite, bool> predicate, Action<Sprite> whenCollides, Action<Sprite> whenNotCollides = null)
{
if (!predicate(sprite))
return;
if (sprite.CheckCollision(x, y))
{
whenCollides(sprite);
foreach (Sprite child in sprite.Children)
{
// translate coordinates to childs coordinate system for next check.
double newX = x, newY = y;
newX -= child.X;
newY -= child.Y;
newX /= child.SizeX;
newY /= child.SizeY;
double cosVal = Math.Cos(-(child.Rotation * (Math.PI / 180)));
double sinVal = Math.Sin(-(child.Rotation * (Math.PI / 180)));
double origX = newX;
newX = newX * cosVal - newY * sinVal;
newY = origX * sinVal + newY * cosVal;
newX -= child.OriginX;
newY -= child.OriginY;
recursiveCollisionCheck(child, newX, newY, predicate, whenCollides, whenNotCollides);
}
}
else if (whenNotCollides != null)
{
whenNotCollides(sprite);
foreach (Sprite child in sprite.AllChildren)
whenNotCollides(child);
}
}