/// <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 void Initialize(int height, Vector2 firstPos, Vector2 alienSize, float margin)
{
aliens = new List<Alien>(height);
for (int i = 0; i < height; ++i) {
AlienType type;
switch (height) {
case 0:
case 1:
type = AlienType.Crab;
break;
case 2:
case 3:
type = AlienType.Ant;
break;
default:
type = AlienType.Squid;
break;
}
aliens.Add( new Alien(this, type, new Vector2(firstPos.X, firstPos.Y + i * (alienSize.Y + margin)), alienSize) );
}
FirstAlien = aliens[0];
LastAlien = aliens[height - 1];
UpdateDimensions();
}
public Shot(Vector2 pos, Vector2 size, Vector2 speed)
: base(pos, size, speed)
{
// TODO : Actually, this is a setup method. Use a shots pool.
Game.Shots.Add(this);
Game.Updatables.Add(this);
}
/// <summary>
/// Move the whole column on space lower.
/// </summary>
/// <param name="y">Vertical distance to descend.</param>
public void Descend(float y)
{
Vector2 delta = new Vector2(0, y);
Position += delta;
foreach (var alien in aliens) {
alien.Move(delta);
}
}
public PhysicalEntity(Vector2 position, Vector2 size)
{
this.Size = size;
this.Position = position;
}
public Ship(Vector2 position, Vector2 size, float speed)
: base(position, size)
{
Speed = speed;
}
private void Move()
{
float movement = direction == Direction.Left ? movementDistance.X * -1 : movementDistance.X;
if (Area.X + movement > 0 && Area.X + Area.Width + movement < 1) {
Position += new Vector2(movement, 0);
foreach (var column in columns) {
column.Move(movement);
}
} else {
Position += new Vector2(0, movementDistance.Y);
direction = direction == Direction.Left ? Direction.Right : Direction.Left;
foreach (var column in columns) {
column.Descend(movementDistance.Y);
}
}
}
public MovingEntity(Vector2 position, Vector2 size, Vector2 speed)
: base(position, size)
{
this.Speed = speed;
}
/// <summary>
/// Move the whole column one step in the given direction.
/// If the column exits its movement range, it moves down.
/// </summary>
/// <param name="x">Horizontal distance to move, if possible.</param>
public void Move(float x)
{
Vector2 delta = new Vector2(x, 0);
Position += delta;
foreach (var alien in aliens) {
alien.Move(delta);
}
}
private void UpdateDimensions()
{
if(null == FirstAlien && null == LastAlien) {
Size = Vector2.zero;
return;
}
Size = new Vector2(FirstAlien.Size.X, LastAlien.Area.TopRight.Y - FirstAlien.Area.BottomRight.Y);
Position = new Vector2(FirstAlien.Position.X, FirstAlien.Position.Y + Size.Y * .5f);
}
public void Move(Vector2 distance)
{
this.Position += distance;
}
public Alien(AlienColumn column, AlienType type, Vector2 position, Vector2 size)
: base(position, size)
{
Column = column;
Type = type;
}
public ShotEnemy(Vector2 pos)
: base(pos, new Vector2(.01f, .02f), new Vector2(.0f, -.05f))
{
}
