WPF实现DNA螺旋粒子动画特效

实现效果如下：

步骤：

1、粒子类Particle.cs

        /// <summary>
        /// 形状
        /// </summary>
        public Ellipse Shape;
        /// <summary>
        /// 坐标
        /// </summary>
        public Point Position;

2、粒子系统ParticleSystem.cs

        /// <summary>
        /// 粒子步数
        /// </summary>
        private int particleCount = 60;

        /// <summary>
        /// 间隔
        /// </summary>
        private readonly int