public override void Update(GameTime gameTime)
{
base.Update(gameTime);
if (_lifeTime <= 0) {
if(Children.Count == 0)
Destroy();
return;
} else {
_lifeTime -= (float)gameTime.ElapsedGameTime.TotalMilliseconds;
}
_spawnTimer += (float)gameTime.ElapsedGameTime.TotalMilliseconds;
if (_spawnTimer > _spawnDelay) {
_spawnTimer = 0f;
float randomLifeTime = _particleLifeTime * NumberFactory.RandomFloat();
float randomAngle = _angle + (0.5f * NumberFactory.RandomFloat() - 0.25f);
Vector2 randomVelocity = new Vector2(_radius * (float)Math.Cos(randomAngle), _radius * (float)Math.Sin(randomAngle));
Particle particle = new Particle(this, "blood", randomLifeTime, _color);
particle.Initialize();
particle.Acceleration = new Vector2(0, 9.81f);
particle.Velocity = randomVelocity;
particle.Position = _stuckTo.Center;
Add(particle, true);
}
}
public override void Update(GameTime gameTime)
{
base.Update(gameTime);
if (_lifeTime <= 0) {
if (Children.Count == 0)
Destroy();
return;
} else {
_lifeTime -= (float)gameTime.ElapsedGameTime.TotalMilliseconds;
}
_spawnTimer += (float)gameTime.ElapsedGameTime.TotalMilliseconds;
if (_spawnTimer > _spawnDelay) {
_spawnTimer = NumberFactory.RandomBetween(0, _spawnDelay);
for (int i = 0; i < _howMany; i++) {
float randomLifeTime = _particleLifeTime * NumberFactory.RandomFloat();
float randomAngle = NumberFactory.RandomBetween(0f, NumberFactory.TwoPi);
Particle particle = new Particle(this, "blood", randomLifeTime, _color, (World)Parent, _position, true);
particle.Acceleration = new Vector2(0, 9.81f);
particle.Size = new Vector2(NumberFactory.RandomBetween(3, 10), NumberFactory.RandomBetween(3, 10));
particle.Velocity = new Vector2(_radius * (float)Math.Cos(randomAngle), _radius * (float)Math.Sin(randomAngle));
particle.Initialize();
Add(particle);
}
}
}
protected override void InitializeParticle(Particle p, Vector2 where)
{
base.InitializeParticle(p, where);
// vt = v0 + (a0 * t).
p.Acceleration = -p.Velocity / p.Lifetime;
}
public ParticleCloud(IParent parent, Vector2 position, int howMany, float radius, float lifeTime, Color color)
: base(parent)
{
Vector2 randomPosition = Vector2.Zero;
Position = position;
for (int i = 0; i < howMany; i++) {
double randomRadius = Math.Sqrt(NumberFactory.RandomDouble()) * radius;
double randomAngle = NumberFactory.RandomDouble() * NumberFactory.TwoPi;
float randomLifeTime = (float)(lifeTime * NumberFactory.RandomDouble());
randomPosition.X = (float)(randomRadius * Math.Cos(randomAngle));
randomPosition.Y = (float)(randomRadius * Math.Sin(randomAngle));
Particle particle = new Particle(this, "cloud", randomLifeTime, color, (World)parent);
particle.Initialize();
particle.Position = position + randomPosition - particle.Size / 2;
Add(particle);
}
}
public void AddParticle()
{
float randomLifeTime = _particleLifeTime * NumberFactory.RandomFloat();
float randomAngle = _angle + (NumberFactory.HalfPi * NumberFactory.RandomFloat() - NumberFactory.QuarterPi);
Particle particle = new Particle(this, "blood", randomLifeTime, Color, (World)Parent, _stuckTo.Position, true, _layerDepth + 0.01f);
particle.Acceleration = new Vector2(0, 9.81f);
particle.Size = new Vector2(NumberFactory.RandomBetween(3, 5), NumberFactory.RandomBetween(3, 5));
if (_stuckTo is Sprite) {
float spriteRotationAngle = ((Sprite)_stuckTo).RotationAngle;
randomAngle += spriteRotationAngle;
//Vector2 offset = new Vector2(_offset.X * (float)Math.Sin(-spriteRotationAngle), _offset.Y * (float)Math.Cos(-spriteRotationAngle));
}
particle.Position = particle.Position + _offset;
particle.Velocity = new Vector2(_radius * (float)Math.Cos(randomAngle), _radius * (float)Math.Sin(randomAngle));
particle.Initialize();
Add(particle);
}
/// <summary>
/// InitializeParticle randomizes some properties for a particle, then
/// calls initialize on it. It can be overriden by subclasses if they
/// want to modify the way particles are created. For example,
/// SmokePlumeParticleSystem overrides this function make all particles
/// accelerate to the right, simulating wind.
/// </summary>
/// <param name="p">the particle to initialize</param>
/// <param name="where">the position on the screen that the particle should be
/// </param>
protected virtual void InitializeParticle(Particle p, Vector2 where)
{
// first, call PickRandomDirection to figure out which way the particle
// will be moving. velocity and acceleration's values will come from this.
Vector2 direction = PickRandomDirection();
// pick some random values for our particle
float velocity =
RandomBetween(minInitialSpeed, maxInitialSpeed);
float acceleration =
RandomBetween(minAcceleration, maxAcceleration);
float lifetime =
RandomBetween(minLifetime, maxLifetime);
float scale =
RandomBetween(minScale, maxScale);
float rotationSpeed =
RandomBetween(minRotationSpeed, maxRotationSpeed);
// then initialize it with those random values. initialize will save those,
// and make sure it is marked as active.
p.Initialize(
where, velocity * direction, acceleration * direction,
lifetime, scale, rotationSpeed);
}
/// <summary>
/// override the base class's Initialize to do some additional work; we want to
/// call InitializeConstants to let subclasses set the constants that we'll use.
///
/// also, the particle array and freeParticles queue are set up here.
/// </summary>
public override void Initialize()
{
InitializeConstants();
// calculate the total number of particles we will ever need, using the
// max number of effects and the max number of particles per effect.
// once these particles are allocated, they will be reused, so that
// we don't put any pressure on the garbage collector.
particles = new Particle[howManyEffects * maxNumParticles];
freeParticles = new Queue<Particle>(howManyEffects * maxNumParticles);
for (int i = 0; i < particles.Length; i++)
{
particles[i] = new Particle();
freeParticles.Enqueue(particles[i]);
}
base.Initialize();
}
private void AddParticle()
{
double randomRadius = Math.Sqrt(NumberFactory.RandomDouble()) * _radius;
double randomAngle = NumberFactory.RandomDouble() * NumberFactory.TwoPi;
float randomLifeTime = (float)(_lifeTime * NumberFactory.RandomDouble());
Vector2 _randomPosition = Vector2.Zero;
_randomPosition.X = (float)(randomRadius * Math.Cos(randomAngle));
_randomPosition.Y = (float)(randomRadius * Math.Sin(randomAngle));
Color _newColor;
if (_randomColor) {
_newColor = RandomColorList[NumberFactory.RandomBetween(0, RandomColorList.Count)];
} else {
_newColor = _color;
}
if(_parent is World) {
Particle particle = new Particle(this, "sparkle", randomLifeTime, _newColor, (World)_parent);
particle.Initialize();
particle.Size *= _scale;
particle.Position = _position + _randomPosition - particle.Size / 2;
Add(particle);
}
}