private Particle GenerateParticle(int index)
{
float speedMultiplier = 1 + random.NextFloat(-SpeedDeviation, SpeedDeviation);
float rotationMultiplier = 1 + random.NextFloat(-RotationDeviation, RotationDeviation);
float scaleMultiplier = 1 + random.NextFloat(-ScaleDeviation, ScaleDeviation);
return(new Particle(Texture, EmitterLocations[index] + new Vector2(Global.rand.NextFloat(0, 0.99f), Global.rand.NextFloat(0, 0.99f)),
Utils.Vector2FromSpeedAndDirection(Speed.Evaluate(0) * speedMultiplier, random.NextFloat(MinDirection, MaxDirection)),
speedMultiplier, Rotation.Evaluate(0) * rotationMultiplier, rotationMultiplier,
new Color(ColorR.Evaluate(0), ColorG.Evaluate(0), ColorB.Evaluate(0), ColorA.Evaluate(0)),
Scale.Evaluate(0), scaleMultiplier, random.NextFloat(MinLifetime, MaxLifetime), HurtsPlayer, DamageRatio));
}
public void Update(GameTime gameTime, PlayState map, bool emitParticles)
{
foreach (Particle particle in particles)
{
particle.Update(gameTime, map);
float age = particle.Age / particle.Lifetime;
Vector2 direction = particle.Velocity;
if (direction != Vector2.Zero)
{
direction.Normalize();
}
particle.Velocity = direction * Speed.Evaluate(age) * particle.SpeedMultiplier;
particle.Rotation = Rotation.Evaluate(age) * particle.RotationMultiplier;
particle.Scale = Scale.Evaluate(age) * particle.ScaleMultiplier;
particle.Color = new Color(ColorR.Evaluate(age), ColorG.Evaluate(age), ColorB.Evaluate(age), ColorA.Evaluate(age));
}
for (int i = 0; i < particles.Count; i++)
{
if (particles[i].Age >= particles[i].Lifetime)
{
particles.RemoveAt(i);
i--;
}
}
if (emitParticles)
{
for (int j = EmitterLocations.Count - 1; j >= 0; j--)
{
float emission = (float)gameTime.ElapsedGameTime.TotalSeconds * EmissionRate;
emissionError += emission - (float)Math.Floor(emission);
emission -= emission - (float)Math.Floor(emission);
emission += (float)Math.Floor(emissionError);
emissionError -= (float)Math.Floor(emissionError);
for (int i = 0; i < emission; i++)
{
particles.Add(GenerateParticle(j));
}
}
}
foreach (IParticleManipulator manipulator in Manipulators)
{
foreach (Particle particle in particles)
{
manipulator.ManipulateParticle(particle);
}
}
}
public Ball Evaluate(int cacheGeneration = 0)
{
if (cacheGeneration == 0)
{
cacheGeneration = Expression.NextAutoIncrementId;
}
return(new Ball()
{
Position = Position.Evaluate(cacheGeneration),
Speed = Speed.Evaluate(cacheGeneration),
AngularSpeed = AngularSpeed.Evaluate(cacheGeneration)
});
}