private void attackTimer_Tick(object sender, EventArgs e)
{
for (int i = 0; i < ALL_ALIENS; i++)
{
//if alien is alive and in attack
if (aliens[i].getState() && aliens[i].inAttack())
{
if (attackSteps <= 6)
{
if (attackSteps == 1)
{
if (attackDir == dir.RIGHT)
{
//go 20px up and to the right
aliens[i].setX(aliens[i].getX() + 20);
aliens[i].setY(aliens[i].getY() - 20);
}
else
{
//go 20px up and to the left
aliens[i].setX(aliens[i].getX() - 20);
aliens[i].setY(aliens[i].getY() - 20);
}
}
else if (attackSteps == 2)
{
if (attackDir == dir.RIGHT)
{
//continue 20px right
aliens[i].setX(aliens[i].getX() + 20);
}
else
{
//continue 20px left
aliens[i].setX(aliens[i].getX() - 20);
}
}
else if (attackSteps == 3 || attackSteps == 4)
{
if (attackDir == dir.RIGHT)
{
//go 20px down and to the right
aliens[i].setX(aliens[i].getX() + 20);
aliens[i].setY(aliens[i].getY() + 20);
}
else
{
//go 20px down and to the left
aliens[i].setX(aliens[i].getX() - 20);
aliens[i].setY(aliens[i].getY() + 20);
}
}
else if (attackSteps == 5 || attackSteps == 6)
{
//continue 20px down
aliens[i].setY(aliens[i].getY() + 20);
}
}
else
{
//slow down the attack
attackTimer.Stop();
attackTimer.Interval = 300;
attackTimer.Start();
if (attackDir == dir.RIGHT)
{
//go 20px down and to the left
aliens[i].setX(aliens[i].getX() - 20);
aliens[i].setY(aliens[i].getY() + 20);
}
else
{
//go 20px down and to the right
aliens[i].setX(aliens[i].getX() + 20);
aliens[i].setY(aliens[i].getY() + 20);
}
//if alien is close enough and still has shots
if (alienShots <= 3 && attackSteps >= 9)
{
missiles[missileCount] = new Missile();
missiles[missileCount].setX(aliens[i].getX() + 7);
missiles[missileCount].setY(aliens[i].getY() + 5);
missiles[missileCount].setType(1);
missiles[missileCount].setImage(Properties.Resources.missile);
missileCount++;
alienShots++;
if (missileTimer.Enabled == false)
{
missileTimer.Start();
}
}
}
break;
}
}
attackSteps++;
parent.Invalidate();
checkAttackState();
}