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| 发表于：2008-05-07 15:37:42 楼主 |
专家啊,救命啊!
private void DesignImage(string DesFilePath,int DesR,int DesWidth,int DesHeight)
{
System.Drawing.Image DesImage = System.Drawing.Image.FromFile(DesFilePath);
if(DesR==1)
{
DesImage.RotateFlip(RotateFlipType.Rotate90FlipY); //90度旋转
}
else if (DesR == 2)
{
DesImage.RotateFlip(RotateFlipType.RotateNoneFlipY); //180度旋转
}
else if (DesR == 3)
{
DesImage.RotateFlip(RotateFlipType.Rotate270FlipY);//360度旋转
}
int x = 0;
int y = 0;
int w = DesImage.Width;
int h = DesImage.Height;
//目标位图
Bitmap dsImage = new Bitmap(DesWidth, DesHeight);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//g.Clear(System.Drawing.Color.Transparent);
Color color = Color.FromArgb(0, Color.Transparent); //背景透明
g.FillRectangle(new SolidBrush(color), new Rectangle(0, 0, DesWidth, DesHeight));
g.DrawImage(DesImage, new System.Drawing.Rectangle(0, 0, DesWidth, DesHeight), new System.Drawing.Rectangle(x, y, w, h), System.Drawing.GraphicsUnit.Pixel);
dsImage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);
g.Dispose();
}
以上的代码是我实现透明图片输出的函数内容,可输出的图片的背景不是透明色,而是黑色,调试了很多次,都无法解决,特开此贴,请专家救急啊! |
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