WPF 基础 2D 图形学知识 求向量旋转角度

Vector vector = p1 - p2;

    static class VectorExtensions
    {
        /// <summary>
        /// 获取向量的 cos（θ）值
        /// </summary>
        /// <param name="vector"></param>
        /// <returns></returns>
        public static double GetCos(this Vector vector)
            => vector.Y / vector.Length;

        /// <summary>
        /// 获取向量的 sin（θ）值
        /// </summary>
        /// <param name="vector"></param>
        /// <returns></returns>
        public static double GetSin(this Vector vector)
            => vector.X / vector.Length;
    }

            var cosθ = vector.GetCos();
            var sinθ = vector.GetSin();

            var 弧度 = Math.Acos(cosθ);

var 角度 = 弧度 / Math.PI * 180;