C# 中我要截取Bitmap的某一部分 怎么做

[ccy222]

TextureBrush MyBrush=new TextureBrush(tmpBmp);
this.picPreview.Refresh();
e.Graphics.TranslateTransform(iRotX,iRotY);
MyBrush.RotateTransform(iAngle);
e.Graphics.TranslateTransform(-iRotX,-iRotY);
e.Graphics.FillRectangle(MyBrush,0,0,this.ClientRectangle.Width,this.ClientRectangle.Height);

我要在此基础上将tmpBmp截取 请问我改怎么做？

[TTOJJ]

到MSDN中查下Graphics.DrawImage()~裏面有好多重載
也可以自己寫函數~~圖片只是一組二維數組，當然還有文件格式，這個都有現成的，簡單的圖形操作樓主應該學會

[wuyq11]

Bitmap b=(Bitmap)Image.FromFile("");
Bitmap bmp=b.Clone(new System.Drawing.Rectangle(0,0,20,20),System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

Image image = System.Drawing.Image.FromFile("a.jpg",true);
Bitmap bmp = new Bitmap(400,400);
Graphics grap = Graphics.FromImage(bmp);
grap.Clear(Color.Transparent);
grap.DrawImage(image,new Rectangle(0,0,400,400));

[dylike]

更简单的是用Graphics.Copyofscreen

[dylike]

CopyFromScreen