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

namespace VisionCommon {
    /// <summary>
    /// 수평/수직 라인의 방향 타입
    /// </summary>
    public enum eLineDirection {
        /// <summary>수평 라인</summary>
        H,
        /// <summary>수직 라인</summary>
        V
    }

    /// <summary>
    /// 시작과 끝점을 가지는 직선
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class Line<T> where T : DoublePoint {
        /// <summary>직선의 시작점</summary>
        public T StartPoint { get; set; }

        /// <summary>직선의 끝점</summary>
        public T EndPoint { get; set; }

        /// <summary>직선의 길이</summary>
        public double Length {
            get {
                return MathUtil.CalculateDistance(StartPoint, EndPoint);
            }
        }

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="startPoint">시작점</param>
        /// <param name="endPoint">끝점</param>
        public Line(T startPoint, T endPoint) {
            StartPoint = startPoint;
            EndPoint = endPoint;
        }

        /// <summary>
        /// 수평/수직 라인 방향을 결정
        /// </summary>
        /// <param name="angle">각도</param>
        /// <returns>라인 방향 (수평 or 수직)</returns>
        public static eLineDirection GetLineDirection(Angle angle) {
            // Cognex는 Line이 -180 ~ 180 Deg (MIL은 0 ~ 360)
            var absDeg = Math.Abs(angle.Degree);
            if (absDeg >= 0 && absDeg < 45) {
                return eLineDirection.H;
            }
            else if (absDeg >= 45 && absDeg < 135) {
                return eLineDirection.V;
            }
            else if (absDeg >= 135 && absDeg < 225) {
                return eLineDirection.H;
            }
            else if (absDeg >= 225 && absDeg < 315) {
                return eLineDirection.V;
            }
            else {
                return eLineDirection.H;
            }
        }
    }
}