/// <summary>
/// Initializes a particle
/// </summary>
/// <param name="p"></param>
/// <param name="where"></param>
/// <param name="direction">set to null for a random direction for each particle</param>
protected virtual void InitializeParticle(Particle p, Vector2 where, Vector2 direction)
{
if (direction == null)
{
direction = PickRandomDirection();
}
// pick some random values for our particle
float velocity =
RandomNumberProvider.RandomBetween(minInitialSpeed, maxInitialSpeed);
float acceleration =
RandomNumberProvider.RandomBetween(minAcceleration, maxAcceleration);
float lifetime =
RandomNumberProvider.RandomBetween(minLifetime, maxLifetime);
float scale =
RandomNumberProvider.RandomBetween(minScale, maxScale);
float rotationSpeed =
RandomNumberProvider.RandomBetween(minRotationSpeed, maxRotationSpeed);
// then initialize it with those random values. initialize will save those,
// and make sure it is marked as active.
p.Initialize(
where, velocity * direction, acceleration * direction,
lifetime, scale, rotationSpeed);
}
public void Initialize(Vector2 position, Vector2 velocity, Vector2 acceleration,
float lifetime, float scale, float rotationSpeed)
{
this.InitialPosition = position;
this.Position = position;
this.Velocity = velocity;
this.InitialVelocity = velocity;
this.Acceleration = acceleration;
this.Lifetime = lifetime;
this.Scale = scale;
this.RotationSpeed = rotationSpeed;
this.TimeSinceStart = 0.0f;
this.Rotation = RandomNumberProvider.RandomBetween(0, MathHelper.TwoPi);
}
protected virtual Vector2 PickRandomDirection()
{
float angle = RandomNumberProvider.RandomBetween(0, MathHelper.TwoPi);
return(new Vector2((float)Math.Cos(angle), (float)Math.Sin(angle)));
}
