private void MoveRight()
{
int PosX = 0;
int PosY = 0;
for (int x = ALIEN_COLUMNS - 1; 0 <= x && PosX == 0; x--)
{
for (int y = ALIEN_ROWS - 1; 0 <= y && PosY == 0; y--)
{
if (aliens[x, y] != null)
{
PosX = x;
PosY = y;
}
}
}
if (Constaints.GameArea.Width <= (aliens[PosX, PosY].Position.X + aliens[PosX, PosY].getWidth() + 1))
{
direction = AlienMoveDiration.Left;
MoveFleet(0, DEFAULT_ALIEN_VERTICAL_MOVEMENT_SPEED);
}
else
{
MoveFleet(currentMovementSpeed, 0);
}
}
private void MoveLeft()
{
int PosX = 0;
int PosY = 0;
for (int x = 0; x < ALIEN_COLUMNS && PosX == 0; x++)
{
for (int y = ALIEN_ROWS - 1; 0 <= y && PosY == 0; y--)
{
if (aliens[x, y] != null)
{
PosX = x;
PosY = y;
}
}
}
if (aliens[PosX, PosY].Position.X <= Constaints.GameArea.X)
{
direction = AlienMoveDiration.Right;
MoveFleet(0, DEFAULT_ALIEN_VERTICAL_MOVEMENT_SPEED);
}
else
{
MoveFleet(-currentMovementSpeed, 0);
}
}
public AlienManager()
{
direction = AlienMoveDiration.Right;
state = GameState.Playing;
aliens = new Alien[ALIEN_COLUMNS, ALIEN_ROWS];
bulletsShot = new List <Bullet>();
currentMovementSpeed = DEFAULT_ALIEN_HORIZONTAL_MOVEMENT_SPEED;
rand = new Random();
// Here, all we are doing is initializing the aliens. We can not set the position until the 'RestAlienPosition()
// function is called. If the playe dies mid gamethe aliens need to be rested to the middle of the screen.
for (int x = 0; x < ALIEN_COLUMNS; x++)
{
for (int y = 0; y < ALIEN_ROWS; y++)
{
aliens[x, y] = new Alien(new Vector2(0), y);
}
}
ResetAlienPosition();
}
public void ResetAlienPosition()
{
if (new Random().Next(100) < 50)
{
direction = AlienMoveDiration.Right;
}
else
{
direction = AlienMoveDiration.Left;
}
for (int x = 0; x < ALIEN_COLUMNS; x++)
{
for (int y = 0; y < ALIEN_ROWS; y++)
{
if (aliens[x, y] != null)
{
Alien alien = aliens[x, y];
alien.setPosition((int)((x * 16) * aliens[x, y].DrawOptions.Scale.X), 0);
}
}
}
float WidestAlienPos = getColumnWidth();
for (int x = ALIEN_COLUMNS - 1; 0 <= x && WidestAlienPos == 0; x--)
{
for (int y = ALIEN_ROWS - 1; 0 <= y && WidestAlienPos == 0; y--)
{
if (aliens[x, y] != null)
{
WidestAlienPos = (float)(aliens[ALIEN_COLUMNS - 1, ALIEN_ROWS - 1].Position.X + aliens[ALIEN_COLUMNS - 1, ALIEN_ROWS - 1].getWidth());
WidestAlienPos = (int)(WidestAlienPos) >> 1;
}
}
}
int ScreenWidth = Constaints.ScreenResolution.ScreenWidth;
for (int x = 0; x < ALIEN_COLUMNS; x++)
{
for (int y = 0; y < ALIEN_ROWS; y++)
{
if (aliens[x, y] != null)
{
if (aliens[x, y] != null)
{
Alien alien = aliens[x, y];
float PosX = (ScreenWidth >> 1) - WidestAlienPos;
float PosY = (float)(32 + (y * 16) * alien.DrawOptions.Scale.X);
// We offset the location of the alien with the smallest width to align it with the
// its other firends.
int offset = 0;
if (alien.getWidth() == alien.DrawOptions.Scale.X * 8)
{
offset = 5;
}
alien.addPosition(PosX + offset, PosY);
aliensAlive++;
}
}
}
}
}
