public void Update(GameTime gameTime)
{
float dt = (float)gameTime.ElapsedGameTime.TotalSeconds;
m_moneyElapsedEmittionTime += dt;
while (m_moneyElapsedEmittionTime > (1.0f / m_emissionRate))
{
SpawnParticle();
m_moneyElapsedEmittionTime -= (1.0f / m_emissionRate);
}
for (int i = m_particles.Count - 1; i >= 0; --i)
{
m_Particle p = m_particles[i];
p.m_life -= dt;
if (p.m_life <= 0.0f)
{
m_particles.RemoveAt(i);
}
p.m_acceleration.Y += m_gravity * dt;
p.m_acceleration.X += m_wind * dt;
p.m_velocity += p.m_acceleration * dt;
p.m_position.X += p.m_velocity.X * dt;
p.m_position.Y -= p.m_velocity.Y * dt;
if (p.m_life <= 1.0f)
{
p.m_alpha = p.m_life * m_transparency;
}
}
}
void SpawnParticle()
{
m_Particle p = new m_Particle();
p.m_life = fRand(m_minLife, m_maxLife);
p.m_rotation = 0.0f;
p.m_color = Color.Green;
p.m_acceleration = new Vector2(m_wind, -m_gravity);
p.m_velocity = new Vector2(fRand(m_minVelocity.X, m_maxVelocity.X), fRand(m_minVelocity.Y, m_maxVelocity.Y));
p.m_position = new Vector2(fRand(-m_emissionSize.X, m_emissionSize.X) + m_position.X,
fRand(-m_emissionSize.Y, m_emissionSize.Y) + m_position.Y);
p.m_size = new Vector2(fRand(m_minSize, m_maxSize));
p.m_alpha = m_transparency;
m_particles.Add(p);
}
