Particle constructor
Particle({})
Constructs a Particle instance.
Implementation
Particle({
this.x = 0.0,
this.y = 0.0,
this.scale = 1.0,
this.rotation = 0.0,
this.frame = 0,
this.color = Colors.black,
this.vx = 0.0,
this.vy = 0.0,
this.lifespan = 0.0,
this.age = 0.0,
});