using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RichCreator.Utility.Structs
{
    /// <summary>
    /// 多边形
    /// </summary>
    public class ZTPolygon : IEnumerable<ZTPoint>
    {
        private ZTPoint[] points;

        public ZTPolygon(ZTPoint[] points)
        {
            this.points = points;
        }

        public ZTPoint[] Points
        {
            get { return points; }
            set { points = value; }
        }

        public int Length
        {
            get { return points.Length; }
        }

        public ZTPoint this[int index]
        {
            get { return points[index]; }
            set { points[index] = value; }
        }

        public static bool operator !=(ZTPolygon a, ZTPolygon b)
        {
            if (a == b)
            {
                return false;
            }
            return true;
        }

        public static bool operator ==(ZTPolygon a, ZTPolygon b)
        {
            if (a.Length != b.Length)
            {
                return false;
            }
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] != b[i])
                {
                    return false;
                }
            }
            return true;
        }

        public static implicit operator ZTPoint[] (ZTPolygon polygon)
        {
            return polygon.points;
        }

        public static implicit operator ZTPolygon(ZTPoint[] points)
        {
            return new ZTPolygon(points);
        }

        IEnumerator<ZTPoint> IEnumerable<ZTPoint>.GetEnumerator()
        {
            return (IEnumerator<ZTPoint>)points.GetEnumerator();
        }

        public IEnumerator GetEnumerator()
        {
            return points.GetEnumerator();
        }
    }
}