protected override void InitializeParticle(Particle p, Vector2 where)
{
base.InitializeParticle(p, where);
// the base is mostly good, but we want to simulate a little bit of wind
// heading to the right.
p.Acceleration.X += MathHelp.RandomBetween(10, 50);
}
protected virtual void InitializeParticle(Particle p, Vector2 where)
{
// first, call PickRandomDirection to figure out which way the particle
// will be moving. velocity and acceleration's values will come from this.
Vector2 direction = new Vector2(1,-1);
// pick some random values for our particle
float velocity =
MathHelp.RandomBetween(minInitialSpeed, maxInitialSpeed);
float acceleration =
MathHelp.RandomBetween(minAcceleration, maxAcceleration);
float lifetime =
MathHelp.RandomBetween(minLifetime, maxLifetime);
float scale =
MathHelp.RandomBetween(minScale, maxScale);
float rotationSpeed =
MathHelp.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 override void Initialize()
{
InitializeConstants();
// calculate the total number of particles we will ever need, using the
// max number of effects and the max number of particles per effect.
// once these particles are allocated, they will be reused, so that
// we don't put any pressure on the garbage collector.
m_Particles = new Particle[m_NrParticles * maxNumParticles];
m_FreeParticles = new Queue<Particle>(m_NrParticles * maxNumParticles);
for (int i = 0; i < m_Particles.Length; i++)
{
m_Particles[i] = new Particle();
m_FreeParticles.Enqueue(m_Particles[i]);
}
base.Initialize();
}