百叶窗效果

Bitmap bmp = new Bitmap(pictureBox1.Image);
            ///等分
            int divide = 11;
            int divideLine = divide + 1;
            //百叶窗宽度
            int width = bmp.Width;
            ///将高度等分=单个叶窗的高
            int height = bmp.Height / divide;
            //
            Point[] p = new Point[divideLine];
            for (int i = 0; i < divideLine; i++)
            {
                p[i].X = 0;
                p[i].Y = i * height;
            }
            ///空图片
            Bitmap bitmap = new Bitmap(bmp.Width, bmp.Height);
            //百叶窗效果
            for (int i = 0; i < height; i++)
            {
                for (int n = 0; n < divideLine; n++)
                    for (int j = 0; j < width; j++)
                        bitmap.SetPixel(p[n].X + j, p[n].Y + i, bmp.GetPixel(p[n].X + j, p[n].Y + i));
                this.Refresh();//刷新
                pictureBox2.Image = bitmap;//显示

                Thread.Sleep(50);
            }