public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
var radiusSq = Radius * Radius;
while (iterator.HasNext)
{
var particle = iterator.Next();
var localPos = particle->Position - particle->TriggerPos;
var distSq = localPos.LengthSquared();
var normal = localPos.ToAxis().ToVector2();
if (Inside)
{
if (distSq < radiusSq) continue;
SetReflected(distSq, particle, normal);
}
else
{
if (distSq > radiusSq) continue;
SetReflected(distSq, particle, -normal);
}
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
var velocityThreshold2 = VelocityThreshold * VelocityThreshold;
while (iterator.HasNext)
{
var particle = iterator.Next();
var velocity2 = particle->Velocity.X * particle->Velocity.X +
particle->Velocity.Y * particle->Velocity.Y;
var deltaColor = VelocityColor - StationaryColor;
if (velocity2 >= velocityThreshold2)
{
VelocityColor.CopyTo(out particle->Color);
}
else
{
var t = (float)Math.Sqrt(velocity2) / VelocityThreshold;
particle->Color = new HslColor(
deltaColor.H * t + StationaryColor.H,
deltaColor.S * t + StationaryColor.S,
deltaColor.L * t + StationaryColor.L);
}
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
while (iterator.HasNext)
{
var particle = iterator.Next();
var left = particle->TriggerPos.X + Width * -0.5f;
var right = particle->TriggerPos.X + Width * 0.5f;
var top = particle->TriggerPos.Y + Height * -0.5f;
var bottom = particle->TriggerPos.Y + Height * 0.5f;
var xPos = particle->Position.X;
var yPos = particle->Position.Y;
if ((int)particle->Position.X < left)
{
xPos = particle->Position.X + Width;
}
else if ((int)particle->Position.X > right)
{
xPos = particle->Position.X - Width;
}
if ((int)particle->Position.Y < top)
{
yPos = particle->Position.Y + Height;
}
else if ((int)particle->Position.Y > bottom)
{
yPos = particle->Position.Y - Height;
}
particle->Position = new Vector2(xPos, yPos);
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
while (iterator.HasNext)
{
var particle = iterator.Next();
particle->Opacity = 1.0f - particle->Age;
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
var delta = FinalScale - InitialScale;
while (iterator.HasNext)
{
var particle = iterator.Next();
particle->Scale = delta * particle->Age + InitialScale;
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
var rotationRateDelta = RotationRate * elapsedSeconds;
while (iterator.HasNext)
{
var particle = iterator.Next();
particle->Rotation += rotationRateDelta;
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
while (iterator.HasNext)
{
var particle = iterator.Next();
var drag = -DragCoefficient * Density * particle->Mass * elapsedSeconds;
particle->Velocity = new Vector2(
particle->Velocity.X + particle->Velocity.X * drag,
particle->Velocity.Y + particle->Velocity.Y * drag);
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
var vector = Direction * (Strength * elapsedSeconds);
while (iterator.HasNext)
{
var particle = iterator.Next();
particle->Velocity = new Vector2(
particle->Velocity.X + vector.X * particle->Mass,
particle->Velocity.Y + vector.Y * particle->Mass);
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
var delta = FinalHue - InitialHue;
while (iterator.HasNext)
{
var particle = iterator.Next();
particle->Color = new HslColor(
delta * particle->Age + InitialHue,
particle->Color.S,
particle->Color.L);
}
}
public void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
while (iterator.HasNext)
{
var particle = iterator.Next();
var diff = Position + particle->TriggerPos - particle->Position;
var distance2 = diff.LengthSquared();
var speedGain = _gravConst * Mass / distance2 * elapsedSeconds;
// normalize distances and multiply by speedGain
particle->Velocity += diff.ToAxis() * speedGain;
}
}
public unsafe void Update(float elapsedseconds, ParticleBuffer.ParticleIterator iterator)
{
var delta = new HslColor(FinalColor.H - InitialColor.H,
FinalColor.S - InitialColor.S,
FinalColor.L - InitialColor.L);
while (iterator.HasNext)
{
var particle = iterator.Next();
particle->Color = new HslColor(
InitialColor.H + delta.H * particle->Age,
InitialColor.S + delta.S * particle->Age,
InitialColor.L + delta.L * particle->Age);
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
while (iterator.HasNext)
{
var particle = iterator.Next();
var left = particle->TriggerPos.X + Width * -0.5f;
var right = particle->TriggerPos.X + Width * 0.5f;
var top = particle->TriggerPos.Y + Height * -0.5f;
var bottom = particle->TriggerPos.Y + Height * 0.5f;
var xPos = particle->Position.X;
var xVel = particle->Velocity.X;
var yPos = particle->Position.Y;
var yVel = particle->Velocity.Y;
if ((int)particle->Position.X < left)
{
xPos = left + (left - xPos);
xVel = -xVel * RestitutionCoefficient;
}
else if (particle->Position.X > right)
{
xPos = right - (xPos - right);
xVel = -xVel * RestitutionCoefficient;
}
if (particle->Position.Y < top)
{
yPos = top + (top - yPos);
yVel = -yVel * RestitutionCoefficient;
}
else if ((int)particle->Position.Y > bottom)
{
yPos = bottom - (yPos - bottom);
yVel = -yVel * RestitutionCoefficient;
}
particle->Position = new Vector2(xPos, yPos);
particle->Velocity = new Vector2(xVel, yVel);
}
}
public unsafe void Update(float elapsedSeconds, ParticleBuffer.ParticleIterator iterator)
{
var velocityThreshold2 = VelocityThreshold * VelocityThreshold;
while (iterator.HasNext)
{
var particle = iterator.Next();
var velocity2 = particle->Velocity.LengthSquared();
float h;
if (velocity2 >= velocityThreshold2)
{
h = VelocityHue;
}
else
{
var t = (float)Math.Sqrt(velocity2) / VelocityThreshold;
h = MathHelper.Lerp(StationaryHue, VelocityHue, t);
}
particle->Color = new HslColor(h, particle->Color.S, particle->Color.L);
}
}