public AsteroidsField(Rectangle boundary, float density = 1f, float minAsteroidsSpeed = 0.1f, float maxAsteroidsSpeed = 0.3f) { Asteroids = new List <Asteroid>(); Boundary = boundary; Density = density; MinSpeed = minAsteroidsSpeed; MaxSpeed = maxAsteroidsSpeed; rand = new AzRandom(); fillField(); }