今天在网上查找下心形算法公式，自己便按照公式写下来标记在博客，主要是方便以后查看！

        private int maxStep = 520;
        private double radius;
        private double centerPt;
        private void CreateHeartLine()
        {
          /*RootCvs是Canvas控件*/
            centerPt = RootCvs.Width / 2;
            radius = RootCvs.Width / 6;
            for (int i = 0; i < maxStep; i++)
            {
                var rect = new Rectangle
                {
                    Height = 5,
                    Width = 5,
                    Fill = Brushes.Red
                };
                double angle = 2 * Math.PI / maxStep * i;
                double r = 2 * radius * (1 - Math.Sin(angle));

                //圆形心
                //double x = centerPt + radius * (2 * Math.Cos(angle) - Math.Cos(2 * angle));
                //double y = centerPt + radius * (2 * Math.Sin(angle) - Math.Sin(2 * angle));

                //桃形心
                double x = centerPt + 16 * (Math.Sin(angle) * Math.Sin(angle) * Math.Sin(angle)) * 10;//
                double y = centerPt + (13 * Math.Cos(angle) - 5 * Math.Cos(2 * angle) - 2 * Math.Cos(3 * angle) - Math.Cos(4 * angle)) * 10;//
                Canvas.SetLeft(rect, x);
                Canvas.SetTop(rect, y);
                RootCvs.Children.Add(rect);
            }
        }