using Autodesk.Revit.DB;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GraphicsStudy
{
    public static class VectorsMethod
    {
        /// <summary>
        /// 向量是否平行
        /// </summary>
        /// <param name="vector1"></param>
        /// <param name="vector2"></param>
        /// <param name="v">true为同向平行，false为反向平行，null为平行</param>
        /// <param name="tolerance">允许误差的角度</param>
        /// <returns></returns>
        public static bool IsParallel(this XYZ vector1, XYZ vector2, bool? v = null, double tolerance = 0.1)
        {
            if (v == null)
            {
                return vector1.AngleTo(vector2) > (180 - tolerance).ToRad() || vector1.DistanceTo(vector2) < tolerance.ToRad();
            }
            else if (v == true)
            {
                return vector1.AngleTo(vector2) < tolerance.ToRad();
            }
            else
            {
                return vector1.AngleTo(vector2) > (180 - tolerance).ToRad();
            }
        }
        
    }
}