Particle constructor
Particle({})
Implementation
Particle({
required this.position,
required this.velocity,
required this.color,
required this.size,
this.isVisible = true,
}) : defaultVelocity = velocity;
Particle({
required this.position,
required this.velocity,
required this.color,
required this.size,
this.isVisible = true,
}) : defaultVelocity = velocity;