private void Update(float timeInSeconds)
{
this.ElapsedTime += timeInSeconds;
double[] sides = { 1, _viewResolution.Width - 1 };
double[] topBottom = { 1, _viewResolution.Height - 1 };
foreach (FluidSimParticle p in _particles)
{
p.Particle.Move(timeInSeconds);
p.LifeTime += timeInSeconds;
if (ShouldResetParticle(p))
{
p.LifeTime = GetNewLifeTime();
if (this.SelectedVelocityField == CommonVelocityFields.UniformStream || this.SelectedVelocityField == CommonVelocityFields.ShearFlow ||
this.SelectedVelocityField == CommonVelocityFields.RotatingCylinder || this.SelectedVelocityField == CommonVelocityFields.FlowPast_Sphere)
{
// Rightward motion only so reset points on left
p.Particle.Position = new Vector(0, this.Rand.Next(0, _viewResolution.Height));
}
//else if (this.SelectedVelocityField == CommonVelocityFields.Vortex || this.SelectedVelocityField == CommonVelocityFields.RankineVortex)
//{
// // Reset particles randomly on screen.
// // Cannot reset to walls because it results in a 'square' coming into the centre as each wave of particles die. Doesn't look right.
// p.Particle.Position = new Vector(this.Rand.Next(0, _viewResolution.Width), this.Rand.Next(0, _viewResolution.Height));
//}
else
{
//Field requires particles to appear from all sides
if (this.Rand.Next(0, 2) == 1)
{
// Place on top or bottom
double topBottomPos = topBottom[this.Rand.Next(0, 2)]; // random of 0 or _viewRes.H
p.Particle.Position = new Vector(this.Rand.Next(1, _viewResolution.Width - 1), topBottomPos);
}
else
{
// Place on left or right
double sidePos = sides[this.Rand.Next(0, 2)]; // random of 0 or _viewRes.W
p.Particle.Position = new Vector(sidePos, this.Rand.Next(1, _viewResolution.Height - 1));
}
}
}
p.Node.Position = new CCPoint((float)p.Particle.Position.X, (float)p.Particle.Position.Y);
}
foreach (FluidSimParticle p in _touchParticles.Where(x => x.Node.Visible))
{
p.Particle.Move(timeInSeconds);
p.LifeTime += timeInSeconds;
if (ShouldResetParticle(p))
{
// Hide!
p.Node.Visible = false;
p.LifeTime = 0;
}
else
{
//Update node position
p.Node.Position = new CCPoint((float)p.Particle.Position.X, (float)p.Particle.Position.Y);
}
}
if (this.IsTouchingScreen && CanReleaseParticle())
{
// Get next available touch particle
// The next available is any particle that is currentlty not visible, OR if all particles are already visible, it instead uses the oldest one
FluidSimParticle p = _touchParticles
.OrderBy(x => x.Node.Visible)
.ThenByDescending(x => x.LifeTime)
.First();
p.LifeTime = 0;
p.Particle.Position = new Vector(this.TouchLocation.X, this.TouchLocation.Y);
p.Node.Position = this.TouchLocation;
p.Node.Visible = true;
}
if (_spinningWheelNode.Visible)
{
float x = (float)(_centreWheelNode.Position.X + (RadiusSlider.Value * 0.9) * Math.Cos(this.ElapsedTime * RotationSlider.Value / 250));
float y = (float)(_centreWheelNode.Position.Y + (RadiusSlider.Value * 0.9) * Math.Sin(this.ElapsedTime * RotationSlider.Value / 250));
_spinningWheelNode.Position = new CCPoint(x, y);
}
UpdateLabels();
}
private bool ShouldResetParticle(FluidSimParticle p)
{
return(p.Particle.Position.X < 0 || p.Particle.Position.X > _viewResolution.Width || p.Particle.Position.Y < 0 || p.Particle.Position.Y > _viewResolution.Height ||
p.Particle.Position.X == double.NaN || p.Particle.Position.Y == double.NaN || p.LifeTime > _maxLifeTime);
}
