/// <summary>
/// Creates a new particle with a random start location, and verticle velocity
/// </summary>1
/// <param name="newParticle"></param>
protected override void NewParticle(XNACS1Particle newParticle)
{
newParticle.CenterX += XNACS1Base.RandomFloat(-(m_FireWidth / 2), (m_FireWidth / 2));
newParticle.CenterY += XNACS1Base.RandomFloat(-1, 1);
Vector2 velocity = m_FireDirection * XNACS1Base.RandomFloat(0, 1);
velocity *= m_Speed;
newParticle.Velocity = velocity;
newParticle.ShouldTravel = true;
}
/// <summary>
/// Overloaded NewParticle Method, gives explosion particles initial velocity and sets
/// ShouldTravel = true.
/// </summary>
/// <param name="newParticle"></param>
protected override void NewParticle(XNACS1Particle newParticle)
{
newParticle.CenterX += XNACS1Base.RandomFloat(-m_Radius / 10, m_Radius / 10);
newParticle.CenterY += XNACS1Base.RandomFloat(-m_Radius / 10, m_Radius / 10);
Vector2 randomVelocity = new Vector2(XNACS1Base.RandomFloat(-1, 1), XNACS1Base.RandomFloat(-1, 1));
randomVelocity.Normalize();
randomVelocity *= m_ExplodeSpeed * XNACS1Base.RandomFloat(.5f, 1);
newParticle.Velocity = randomVelocity;
newParticle.ShouldTravel = true;
}
/// <summary>
/// Overloaded TravelPrimitive for Particles.
/// Moves the particle during each update cycle. This function is automacially called for all visible
/// particle. Default behavior is to move the particle if:
/// . Primitive is visible (invivislble primitive is not updated)
/// . ShouldTravel is true
/// . HasNonZeroVelocity() is true
/// This method moves the particle in the direction of its velocity and also displaces it according to the ParticleTravelMode chosen.
/// </summary>
public override void TravelPrimitive()
{
if (m_ParticleLife > 0)
{
m_ParticleLife--;
}
if (Visible && ShouldTravel)
{
m_TravelTime++;
if (HasNonZeroVelocity())
{
m_Center += Velocity;
}
if (m_TravelMode != ParticleTravelMode.Linear)
{
Vector2 velocityNormal = Vector2.Zero;
Vector2 velocityFront;
if (m_LastCenter == m_Center)
{
velocityFront = VelocityDirection;
}
else
{
velocityFront = (m_Center - m_LastCenter);
}
velocityNormal.X = -(velocityFront).Y;
velocityNormal.Y = (velocityFront).X;
velocityNormal.Normalize();
//not dependent on velocity;
switch (m_TravelMode)
{
case ParticleTravelMode.RandomDisplace:
m_Displacement += new Vector2(XNACS1Base.RandomFloat(-1, 1), XNACS1Base.RandomFloat(-1, 1)) * m_DisplacementFrequency;
if (m_Displacement.Length() > m_DisplacementAmplitude)
{
m_Displacement.Normalize();
}
break;
case ParticleTravelMode.TransverseSine:
m_Displacement = velocityNormal * m_DisplacementAmplitude * (float)Math.Sin(m_DisplacementFrequency * m_TravelTime);
break;
case ParticleTravelMode.CompressionSine:
m_Displacement = Vector2.Normalize(m_Center - m_LastCenter) * m_DisplacementAmplitude * (float)Math.Sin(m_DisplacementFrequency * m_TravelTime);
break;
case ParticleTravelMode.VerticalSine:
m_Displacement = Vector2.UnitY * m_DisplacementAmplitude * (float)Math.Sin(m_DisplacementFrequency * m_TravelTime);
break;
case ParticleTravelMode.HorizontalSine:
m_Displacement = Vector2.UnitX * m_DisplacementAmplitude * (float)Math.Sin(m_DisplacementFrequency * m_TravelTime);
break;
}
}
m_LastCenter = m_Center;
}
}