c# winform 可以画出不规则图形的pictureBox么

public Form1()

{

    InitializeComponent();

    //pictureBox1在设计界面添加     

    System.Drawing.Drawing2D.GraphicsPath shape = new System.Drawing.Drawing2D.GraphicsPath();

    shape.AddEllipse(0, 0, pictureBox1.Width, pictureBox1.Height);  

    pictureBox1.Region = new System.Drawing.Region(shape);

}

// <summary>

        /// 根据背景图像设置窗体的不规则形状

        /// </summary>

        /// <param name="bitmap">背景图像</param>

        /// <param name="transColor">指定颜色为透明的</param>

        /// <returns></returns>

        protected Region SetMainFormRegionFormBitmap(Bitmap bitmap, Color transColor)

        {

            GraphicsPath FormPath = new GraphicsPath();

            try

            {

                for (int y = 0; y < this.Height; y++)

                {

                    for (int x = 0; x < this.Width; x++)

                    {

                        if (bitmap.GetPixel(x, y) == transColor)

                            continue;

                        int x0 = x;

                        while ((x < this.Width) && (bitmap.GetPixel(x, y) != transColor))

                            x++;





                        FormPath.AddRectangle(new Rectangle(x0, y, x - x0, 1));

                    }

                }



            }

            catch

            {



            }

            Region regi = new Region(FormPath);

            FormPath.Dispose();

            return regi;

        }

//在构造函数里调用即可

this.Region = this.SetMainFormRegionFormBitmap((Bitmap)BackgroundImage, Color.FromArgb(0, 0, 255));