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 struct ZTPolygon :IEquatable<ZTPolygon>
    {
        public static ZTPolygon Empty = default(ZTPolygon);

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

        public ZTPoint[] Points
        {
            get;set;
        }

        public int Length
        {
            get { return Points==null?0:Points.Length; }
        }

        public ZTPoint this[int index]
        {
            get { return Points[index]; }
            set { Points[index] = value; }
        }
        
        public bool Equals(ZTPolygon other)
        {
            
            if (this.Length != other.Length)
            {
                return false;
            }
            for (int i = 0; i < this.Length; i++)
            {
                if (!this[i].Equals(other[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);
        }

        
    }
}