/// <summary>
/// This method will generate particles for a Default Particle Effect.
/// </summary>
/// <param name="particleEngine">The Particle Engine that will use this effect.</param>
public override Particle GenerateParticle(ParticleEngine particleEngine)
{
// Pick a random texture from the texture list available
Texture2D texture = particleEngine.Textures[random.Next(particleEngine.Textures.Count)];
// Set the location of the new particle based upon the emitter location
Vector2 position = particleEngine.EmitterLocation;
// Set the velocity for the new particle using random generated values
Vector2 velocity = new Vector2(
1f * (float)(random.NextDouble() * 2 - 1),
1f * (float)(random.NextDouble() * 2 - 1));
float angle = 0;
// Set a random angularvelocity (spinning)
float angularVelocity = 0.1f * (float)(random.NextDouble() * 2 - 1);
// Set a random color for this particle
Color color = new Color(
(float)random.NextDouble(),
(float)random.NextDouble(),
(float)random.NextDouble());
// Set a random size for this particle
float size = (float)random.NextDouble() * startingScale;
// Set a random ttl for this particle (minimum 5)
int ttl = 20 + random.Next(40);
// Set the total number of particles for this effect
particleEngine.TotalParticles = numberOfParticles;
// Return a new particle generated according to the above
return(new Particle(texture, position, velocity, angle, angularVelocity, color, size, ttl));
}
/// <summary> /// A Particle Effect needs to implement a GenerateParticle() method. /// </summary> /// <param name="particleEngine">The Particle Engine that will use this. Needed for EmitterLocation and access to totalParticles field.</param> public abstract Particle GenerateParticle(ParticleEngine particleEngine);