public void SpawnBirbs(Vector3 position)
{
var numBirbs = FlatRedBallServices.Random.Next(MinBirbs, MaxBirbs);
for (int i = 0; i < numBirbs; i++)
{
var birb = MenuBirbFactory.CreateNew(this.LayerProvidedByContainer);
MenuBirbList.Add(birb);
birb.SetRandomAnimationFrame();
//Position
birb.Position = position;
//Initial Velocity
var randDeg = FlatRedBallServices.Random.Between(-MaxFlyVariationDeg, MaxFlyVariationDeg);
var newAngleDeg = DefaultFlyAngleDeg + randDeg;
var newAngleRad = newAngleDeg * (Math.PI / 180);
Vector3 birdVector = new Vector3((float)Math.Cos(newAngleRad), (float)Math.Sin(newAngleRad), Z) * MaxSpeed;
birb.Velocity = birdVector;
//X velocity to fly off screen.
var sign = FlatRedBallServices.Random.Next(0, 2) * 2 - 1;
birb.XAcceleration = BirbXAccel * sign;
birb.Drag = FlatRedBallServices.Random.Between(MinBirbDrag, MaxBirbDrag);
}
}
private void ManageBirbs()
{
for (int i = MenuBirbList.Count - 1; i > -1; i--)
{
var birb = MenuBirbList[i];
if (birb.X < Camera.Main.AbsoluteLeftXEdgeAt(birb.Z) || birb.X > Camera.Main.AbsoluteRightXEdgeAt(birb.Z))
{
birb.Destroy();
MenuBirbList.Remove(birb);
}
}
}
