protected override void Initialize()
{
base.Initialize();
screenWidth = GraphicsDevice.Viewport.Width;
screenHeight = GraphicsDevice.Viewport.Height;
Random random = new Random();
helicopters = new List <Helicopter>();
for (var i = 0; i < 4; i++)
{
var maxX = screenWidth - Helicopter.frameWidth;
var maxY = screenHeight - Helicopter.frameHeight;
var velocity = new Vector2(2f + 2f * (float)random.NextDouble(), 1.5f + 1.5f * (float)random.NextDouble());
for (var j = 0; j < 20; j++)
{
var position = new Vector2(random.Next(maxX), random.Next(0, maxY));
var helicopter = new Helicopter(
this,
position,
velocity
);
if (!helicopter.collidesWith(helicopters))
{
helicopter.LoadContent();
helicopters.Add(helicopter);
break;
}
}
}
}
public void collideWith(Helicopter other)
{
// TODO: Improve collision behavior, f.ex. http://en.wikipedia.org/wiki/Elastic_collision#Two-Dimensional_Collision_With_Two_Moving_Objects
this.velocity *= -1;
}
public Boolean collidesWith(Helicopter other)
{
return(this.getRectangle().Intersects(other.getRectangle()));
}