/// <summary>
/// Initiliaze a new alien army.
/// </summary>
/// <param name="centre">Centre of the army.</param>
/// <param name="width">Number of columns composing the army.</param>
/// <param name="height">Number of rows in each column.</param>
/// <param name="alienSize">Size of aliens.</param>
/// <param name="margin">Space to leave between aliens.</param>
public void Initialize(Vector2 centre, int width, int height, Vector2 alienSize, Vector2 margin)
{
float armyWidth = width * (alienSize.X + margin.X) - margin.X;
float armyHeight = height * (alienSize.Y + margin.Y) - margin.Y;
float lowestPos = centre.Y - armyHeight * .5f;
float rightMostPos = centre.X - armyWidth * .5f;
float leftMostPos = centre.X + armyWidth * .5f;
columns = new AlienColumn[width];
for (int i = 0; i < width; ++i) {
columns[i] = new AlienColumn();
columns[i].Initialize(
height,
new Vector2(rightMostPos + alienSize.X * .5f + i * (alienSize.X + margin.X), lowestPos),
alienSize,
margin.Y);
}
Position = centre;
Size = new Vector2(
columns[width - 1].Area.TopRight.X - columns[0].Area.TopLeft.X,
columns[0].Area.TopLeft.Y - columns[0].Area.BottomLeft.Y);
Game.Updatables.Add(this);
}
public Alien(AlienColumn column, AlienType type, Vector2 position, Vector2 size)
: base(position, size)
{
Column = column;
Type = type;
}