可能不大对题，前面发过的，图像局部透明的，原理差不多，参考着改改
/// <summary>
/// 图像挖洞
/// </summary>
/// <param name="_x">透明位置x</param>
/// <param name="_y">透明位置x</param>
/// <param name="_width">透明宽度</param>
/// <param name="_height">透明高度</param>
/// <param name="src">图像</param>
/// <param name="num">图像整体透明度</param>
/// <param name="trans">挖洞部分透明度</param>
/// <returns></returns>
public Bitmap potholing (int _x,int _y,int _width, int _height, Bitmap src, int num, int trans)
{
try
{
int w = src.Width;
int h = src.Height;
Bitmap dstBitmap = new Bitmap(src.Width, src.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
System.Drawing.Imaging.BitmapData srcData = src.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
System.Drawing.Imaging.BitmapData dstData = dstBitmap.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
unsafe
{
byte* pIn = (byte*)srcData.Scan0.ToPointer();
byte* pOut = (byte*)dstData.Scan0.ToPointer();
byte* p;
int stride = srcData.Stride;
int r, g, b;
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
p = pIn;
b = pIn[0];
g = pIn[1];
r = pIn[2];
pOut[1] = (byte)g;
pOut[2] = (byte)r;
if ((y > _y) && (y < _height) && (x > _x) && (x < _height))
{
pOut[3] = (byte)trans;
} else pOut[3] = (byte)num;
pOut[0] = (byte)b;
pIn += 4;
pOut += 4;
}
pIn += srcData.Stride - w * 4;
pOut += srcData.Stride - w * 4;
}
src.UnlockBits(srcData);
dstBitmap.UnlockBits(dstData);
return dstBitmap;
}
}
catch (Exception e)
{
MessageBox.Show(e.Message.ToString());
return null;
}
}
public Form1()
{
InitializeComponent();
pictureBox1.Parent = pictureBox2;
}
private void button1_Click(object sender, EventArgs e)
{
Bitmap _bmp = new Bitmap(@"e.png");
_bmp = potholing(20,20,190,190,_bmp, 255,0);
pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
pictureBox1.Image = _bmp;
}
}
过于巨大
