通过曲线分割线裁剪图像以获取winforms中的拼图

Question

我试图在Windows窗体中裁剪图像（C＃）。我是用直角做的。但我想用曲线分开它。

将单个图像分割为3x3图像，然后放入9个不同的图像框中。这是我目前的代码：

Image img = pictureBox1.Image;
int widththird = (int)((double)img.Width / 3.0 + 0.5);
int heightthird = (int)((double)img.Height / 3.0 + 0.5);
Bitmap[,] bmps = new Bitmap[3, 3];
for (int i = 0; i < 3; i++)
{
    for (int j = 0; j < 3; j++)
    {
        bmps[i, j] = new Bitmap(widththird, heightthird);
        Graphics g = Graphics.FromImage(bmps[i,j]);
        g.DrawImage(img, new Rectangle(0, 0, widththird, heightthird), new 
        Rectangle(j * widththird, i * heightthird, widththird, heightthird), 
        GraphicsUnit.Pixel);
        g.Dispose();

    }

}
pictureBox2.Image = bmps[0, 0];
pictureBox3.Image = bmps[0, 1];
pictureBox4.Image = bmps[0, 2];
pictureBox5.Image = bmps[1, 0];
pictureBox6.Image = bmps[1, 1];
pictureBox7.Image = bmps[1, 2];
pictureBox8.Image = bmps[2, 0];
pictureBox9.Image = bmps[2, 1];
pictureBox10.Image = bmps[2, 2];

问：如何使用曲线裁剪/拆分图像并导出碎片？

我的输出：

我希望它像这样裁剪：