public void AddExplosion(Vector2 explosionPos, int numberOfParticles, float size, float maxAge, GameTime gameTime)
{
for (var i = 0; i < numberOfParticles; i++)
{
var particle = new ParticleData(explosionPos, size, maxAge, i, gameTime);
ParticleList.Add(particle);
}
}
private Boolean UpdateParticle(GameTime gameTime, ParticleData particle)
{
var now = (float)gameTime.TotalGameTime.TotalMilliseconds;
var timeAlive = now - particle.BirthTime;
if (timeAlive > particle.MaxAge)
{
return(false);
}
var relAge = timeAlive / particle.MaxAge;
particle.Position = 0.5f * particle.Accelaration * relAge * relAge + particle.Direction * relAge + particle.OrginalPosition;
var invAge = 1.0f - relAge;
particle.ModColor = new Color(new Vector4(invAge, invAge, invAge, invAge));
var positionFromCenter = particle.Position - particle.OrginalPosition;
var distance = positionFromCenter.Length();
particle.Scaling = (50.0f + distance) / 200.0f;
return(true);
}
