/// <summary>
/// Constructs a new particle emitter object.
/// </summary>
public ParticleEmitter(ParticleSystem particleSystem,
float particlesPerSecond, Vector3 initialPosition)
{
this.particleSystem = particleSystem;
timeBetweenParticles = 1.0f / particlesPerSecond;
previousPosition = initialPosition;
}
public void Draw(SpriteBatch sb, ParticleSystem ps)
{
foreach (var p in ps.Particles) {
if (p != null) {
var c = Color;
c.A = (byte)MathHelper.Lerp(255, 0, (p.Age / (float)p.MaxAge));
var p0 = p.Position.ToVector2() * scale + Position;
sb.Draw(texture, p0, null, c, 0, origin, 1f, SpriteEffects.None, 0f);
}
}
foreach (var a in ps.Attractors) {
var pos = a.Position.ToVector2() * scale + Position;
sb.Draw(texture, pos, null, Color, 0, origin, 1f, SpriteEffects.None, 0f);
}
}
/// <summary>
/// Constructs a new projectile.
/// </summary>
public Projectile(ParticleSystem explosionParticles,
ParticleSystem explosionSmokeParticles,
ParticleSystem projectileTrailParticles)
{
this.explosionParticles = explosionParticles;
this.explosionSmokeParticles = explosionSmokeParticles;
// Start at the origin, firing in a random (but roughly upward) direction.
position = Vector3.Zero;
velocity.X = (float)(random.NextDouble() - 0.5) * sidewaysVelocityRange;
velocity.Y = (float)(random.NextDouble() + 0.5) * verticalVelocityRange;
velocity.Z = (float)(random.NextDouble() - 0.5) * sidewaysVelocityRange;
// Use the particle emitter helper to output our trail particles.
trailEmitter = new ParticleEmitter(projectileTrailParticles,
trailParticlesPerSecond, position);
}
public ParticleSystemVisualizer(ParticleSystem ps, Vector2 position, float scale)
{
particleSystem = ps;
Position = position;
this.scale = scale;
}
/// <summary>
/// removes the passed in ParticleSystem from the internal list once
/// it is stopped and has no active particles, this will destroy the
/// particle system and its particles if no other references to it exists
/// </summary>
/// <param name="ps">ParticleSystem to destroy</param>
public static void DestroyIdlePS(ParticleSystem ps)
{
if (!ps.isPlaying && ps.particleCount == 0)
DestroyActivePS(ps);
else if (!destroySystems.Contains(ps))
destroySystems.Add(ps);
}
/// <summary>
/// removes the passed in ParticleSystem from the internal list, this will destroy
/// the particle system and its particles if no other references to it exists
/// </summary>
/// <param name="ps">ParticleSystem to destroy</param>
public static void DestroyActivePS(ParticleSystem ps)
{
if (ps != null && particleSystems.Contains(ps))
particleSystems.Remove(ps);
}
/// <summary>
/// creates a new ParticleSystem using the passed in Texture2D and returns it
/// (use the returned ParticleSystem to change the particle system settings)
/// </summary>
/// <param name="texture">texture that each of this ParticleSystem's particles will use</param>
/// <returns>ParticleSystem</returns>
public static ParticleSystem CreateParticleSystem(Texture2D texture)
{
if (spriteBatch == null)
throw new Exception("must initialise 'Particles' with a non-null SpriteBatch object before use");
if (texture == null)
throw new Exception("cannot pass null for parameter 'texture' when calling 'ParticleSystem.CreateParticleSystem'");
ParticleSystem ps = new ParticleSystem(texture, spriteBatch, rng);
particleSystems.Add(ps);
return ps;
}
public Model3D CreateParticleSystem(int maxCount, System.Windows.Media.Color color)
{
ParticleSystem ps = new ParticleSystem(maxCount, color);
this.particleSystems.Add(color, ps);
return ps.ParticleModel;
}
