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public class Planet
    {

        private PointF orbit_center;

        public PointF Orbit_center
        {
            get { return orbit_center; }
            set { orbit_center = value; }
        }
        private double orbit_radius;

        public double Orbit_radius
        {
            get { return orbit_radius; }
            set { orbit_radius = value; }
        }
        private double speed;

        public double Speed
        {
            get { return speed; }
            set { speed = value; }
        }
        private double orbit_angle = 0;
        private double self_rotating_speed;

        public double Self_rotating_speed
        {
            get { return self_rotating_speed; }
            set { self_rotating_speed = value; }
        }
        private PointF self_center;

        public PointF Self_center
        {
            get { return self_center; }
            set { self_center = value; }
        }
        private PointF position;

        public PointF Position
        {
            get { return position; }
            set { position = value; }
        }
        private double rotation;

        public double Rotation
        {
            get { return rotation; }
            set { rotation = value; }
        }
        private string texture_path;

        public string Texture_path
        {
            get { return texture_path; }
            set { texture_path = value; }
        }
        private double size;

        public double Size
        {
            get { return size; }
            set { size = value; }
        }
        private bool hasTrabants;

        public bool HasTrabants
        {
            get { return hasTrabants; }
            set { hasTrabants = value; }
        }
        private Planet[] trabants;

        public Planet[] Trabants
        {
            get { return trabants; }
            set { trabants = value; }
        }

        private string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public void AddTrabant(Planet planet)
        {
            List<Planet> planets;
            try
            {
                planets = trabants.ToList<Planet>();
            }
            catch
            {
                planets = new List<Planet>();
            }
            planets.Add(planet);
            trabants = planets.ToArray();
            trabants[trabants.Length - 1].Parent = this;
        }

        
        public Planet()
        {
            
        }

        public Planet(Planet parent, string name,PointF orbit_center,double orbit_radius,double speed,double rotatingspeed,string texture_path,double size,bool hasTrabants)
        {
            this.parent = parent;
            this.name = name;
            this.orbit_center=orbit_center;
            this.orbit_radius=orbit_radius;
            this.speed=speed;
            this.self_rotating_speed=rotatingspeed;
            this.texture_path=texture_path;
            this.size = size;
            this.hasTrabants = hasTrabants;
            position = new PointF(parent.Position.X + (float)orbit_radius, parent.Position.Y);
        }

        public Planet(Planet parent, string name, PointF orbit_center, double orbit_radius, double speed, double rotatingspeed, string texture_path, double size, bool hasTrabants,PointF position)
        {
            this.parent = parent;
            this.name = name;
            this.orbit_center = orbit_center;
            this.orbit_radius = orbit_radius;
            this.speed = speed;
            this.self_rotating_speed = rotatingspeed;
            this.texture_path = texture_path;
            this.size = size;
            this.hasTrabants = hasTrabants;
            this.position = position;
        }

        private Planet parent;

        public Planet Parent
        {
            get { return parent; }
            set { parent = value; }
        }

        public void Move()
        {
            position.X = (float)(parent.Position.X+(Math.Cos(orbit_angle) * orbit_radius));
            position.Y = (float)(parent.Position.Y+(Math.Sin(orbit_angle) * orbit_radius));
            orbit_angle += speed;
        }

        public void Rotate()
        {
            rotation += self_rotating_speed;
        }
    }                    

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