图片拉伸渐变问题

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1、C#将一个很小的图片绘制到一个很大的区域（图片拉伸），会造成图片产生渐变的效果：如果设置：e.Graphics.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;//采取相邻颜色填补的方式拉伸图片则会造成下面的效果：在拉伸区域的后面出现空白。解决这个问题有以下2种方法（方法2和方法3）：intnSpanWidth=596;privatevoidForm1_Paint(objectsender,PaintEventArgse){if(myImage==null)retur

2、n;e.Graphics.DrawRectangle(Pens.Black,newRectangle(20,50,nSpanWidth,40));#region方法1：达不到要求e.Graphics.DrawImage(myImage,newRectangle(20,50,nSpanWidth,40));#endregion#region方法2System.Drawing.Imaging.ImageAttributesImgAtt=newSystem.Drawing.Imaging.ImageAttributes();ImgAtt.SetWrapMode(System.D

3、rawing.Drawing2D.WrapMode.TileFlipXY);e.Graphics.DrawImage(myImage,newRectangle(20,100,nSpanWidth,40),0,0,myImage.Width,myImage.Height,GraphicsUnit.Pixel,ImgAtt);#endregion#region方法3TextureBrushTxbrus=newTextureBrush(myImage);Txbrus.WrapMode=System.Drawing.Drawing2D.WrapMode.Tile;e.Graphi

4、cs.FillRectangle(Txbrus,newRectangle(20,150,nSpanWidth,40));#endregion}ImagemyImage;privatevoidbutton1_Click(objectsender,EventArgse){OpenFileDialogopen=newOpenFileDialog();if(open.ShowDialog()==DialogResult.OK){myImage=Image.FromFile(open.FileName);}}