在Visual Studio C＃中的PictureBox中填写函数吗？

在这里，我有一个想法，您可以recursion用来遍历像素并修改其颜色。

Bitmap bmp;
private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
{
    int x = e.X;
    int y = e.Y;

    bmp = (Bitmap)pictureBox1.Image;
    ModifyMap(x, y);
    pictureBox1.Image = bmp;
}

// Recursion
private void ModifyMap(int x, int y)
{
    // the color info of gray part "Color [A=255, R=153, G=153, B=153]"
    if (bmp.GetPixel(x, y).ToString() == "Color [A=255, R=153, G=153, B=153]")
    {
        bmp.SetPixel(x, y, Color.Blue);
        ModifyMap(x + 1, y);
        ModifyMap(x - 1, y);
        ModifyMap(x, y + 1);
        ModifyMap(x, y - 1);
    }
}

测试结果