using System;
using System.Collections.Generic;
using System.Text;

namespace SalsaModel
{
    struct Angle
    {
        const double Min = -Math.PI;
        const double Max = Math.PI;
        const double Range = Max - Min;

        double _val;

        public Angle(double init)
        {
            init = Normalise(init);
            _val = init;
        }

        private static double Normalise(double init)
        {
            while (init < Min)
            {
                init += Range;
            }
            while (init >= Max)
            {
                init -= Range;
            }
            return init;
        }

        public double Value { get { return _val; } }

        public static Angle operator +(Angle a, Angle b)
        {
            return new Angle(a.Value + b.Value);
        }
        public static Angle operator -(Angle a, Angle b)
        {
            return new Angle(a.Value - b.Value);
        }
        public static Angle operator *(Angle a, double f)
        {
            return new Angle(a.Value * f);
        }

        public override bool Equals(object obj)
        {
            if (obj is Angle)
            {
                Angle a = (Angle)obj;
                return a.Value == this.Value;
            }
            return false;
        }
        public static bool operator ==(Angle a, Angle b)
        {
            return a.Equals(b);
        }
        public static bool operator !=(Angle a, Angle b)
        {
            return !a.Equals(b);
        }
        public override int GetHashCode()
        {
            return Value.GetHashCode();
        }
    }
}