Particle
constructor(kind: ParticleKind = ParticleKind.CIRCLE, density: ParticleDensity = ParticleDensity.NORMAL, count: Int = 0, size: Size = Size(2), speed: Double = 1.0, trails: Boolean = true, trailsFade: Double = 0.97, dropRate: Double = 0.01, dropRateBump: Double = 0.01)