/// <summary>
/// Linearly interpolates the Particle's Color between it's Start Color and End Color based on the Particle's Normalized Elapsed Time.
/// </summary>
/// <param name="cParticle">The Particle to update</param>
/// <param name="fElapsedTimeInSeconds">How long it has been since the last update</param>
protected void UpdateParticleColorUsingLerp(DPSFDefaultBaseParticle cParticle, float fElapsedTimeInSeconds)
{
// Update the Particle's Color
cParticle.Color = DPSFHelper.LerpColor(cParticle.StartColor, cParticle.EndColor, cParticle.NormalizedElapsedTime);
}
/// <summary>
/// Function to Initialize a Default Particle with the Initial Settings
/// </summary>
/// <param name="Particle">The Particle to be Initialized</param>
/// <param name="cInitialProperties">The Initial Settings to use to Initialize the Particle</param>
public void InitializeParticleUsingInitialProperties(DPSFParticle Particle, CInitialProperties cInitialProperties)
{
// Cast the Particle to the type it really is
DPSFDefaultBaseParticle cParticle = (DPSFDefaultBaseParticle)Particle;
// Initialize the Particle according to the values specified in the Initial Settings
cParticle.Lifetime = DPSFHelper.RandomNumberBetween(cInitialProperties.LifetimeMin, cInitialProperties.LifetimeMax);
// If the Position should be interpolated between the Min and Max Positions
if (cInitialProperties.InterpolateBetweenMinAndMaxPosition)
{
cParticle.Position = Vector3.Lerp(cInitialProperties.PositionMin, cInitialProperties.PositionMax, RandomNumber.NextFloat());
}
// Else the Position XYZ values should each be calculated individually
else
{
cParticle.Position = DPSFHelper.RandomVectorBetweenTwoVectors(cInitialProperties.PositionMin, cInitialProperties.PositionMax);
}
// If the Particle's Velocity should be affected by the Emitters Orientation
if (cInitialProperties.VelocityIsAffectedByEmittersOrientation)
{
// Rotate the Particle around the Emitter according to the Emitters orientation
cParticle.Position = Vector3.Transform(cParticle.Position, Emitter.OrientationData.Orientation);
}
// If the Particle should be affected by the Emitters Position
if (cInitialProperties.PositionIsAffectedByEmittersPosition)
{
// Add the Emitter's Position to the Particle's Position
cParticle.Position += Emitter.PositionData.Position;
}
// If the Velocity should be interpolated between the Min and Max Velocity
if (cInitialProperties.InterpolateBetweenMinAndMaxVelocity)
{
cParticle.Velocity = Vector3.Lerp(cInitialProperties.VelocityMin, cInitialProperties.VelocityMax, RandomNumber.NextFloat());
}
// Else the Velocity XYZ values should each be calculated individually
else
{
cParticle.Velocity = DPSFHelper.RandomVectorBetweenTwoVectors(cInitialProperties.VelocityMin, cInitialProperties.VelocityMax);
}
// Have the Emitters Rotation affect the Particle's starting Velocity
cParticle.Velocity = Vector3.Transform(cParticle.Velocity, Emitter.OrientationData.Orientation);
// If the Acceleration should be interpolated between the Min and Max Acceleration
if (cInitialProperties.InterpolateBetweenMinAndMaxAcceleration)
{
cParticle.Acceleration = Vector3.Lerp(cInitialProperties.AccelerationMin, cInitialProperties.AccelerationMax, RandomNumber.NextFloat());
}
// Else the Acceleration XYZ values should each be calculated individually
else
{
cParticle.Acceleration = DPSFHelper.RandomVectorBetweenTwoVectors(cInitialProperties.AccelerationMin, cInitialProperties.AccelerationMax);
}
// If the External Force should be interpolated between the Min and Max External Force
if (cInitialProperties.InterpolateBetweenMinAndMaxExternalForce)
{
cParticle.ExternalForce = Vector3.Lerp(cInitialProperties.ExternalForceMin, cInitialProperties.ExternalForceMax, RandomNumber.NextFloat());
}
// Else the External Force XYZ values should each be calculated individually
else
{
cParticle.ExternalForce = DPSFHelper.RandomVectorBetweenTwoVectors(cInitialProperties.ExternalForceMin, cInitialProperties.ExternalForceMax);
}
// Calculate the amount of Friction to use
cParticle.Friction = DPSFHelper.RandomNumberBetween(cInitialProperties.FrictionMin, cInitialProperties.FrictionMax);
// If the new Color values should be somewhere between the interpolation of the Min and Max Colors
if (cInitialProperties.InterpolateBetweenMinAndMaxColors)
{
cParticle.StartColor = DPSFHelper.LerpColor(cInitialProperties.StartColorMin, cInitialProperties.StartColorMax, RandomNumber.NextFloat());
cParticle.EndColor = DPSFHelper.LerpColor(cInitialProperties.EndColorMin, cInitialProperties.EndColorMax, RandomNumber.NextFloat());
}
// Else the RGBA Color values should each be randomly calculated individually
else
{
cParticle.StartColor = DPSFHelper.LerpColor(cInitialProperties.StartColorMin, cInitialProperties.StartColorMax, RandomNumber.NextFloat(), RandomNumber.NextFloat(), RandomNumber.NextFloat(), RandomNumber.NextFloat());
cParticle.EndColor = DPSFHelper.LerpColor(cInitialProperties.EndColorMin, cInitialProperties.EndColorMax, RandomNumber.NextFloat(), RandomNumber.NextFloat(), RandomNumber.NextFloat(), RandomNumber.NextFloat());
}
cParticle.Color = cParticle.StartColor;
}