ASP.NET中高质量缩略图的生成代码

2024-07-10 12:39:58

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private Size NewSize(int maxWidth, int maxHeight, int width, int height)
        {
            double w = 0.0;
            double h = 0.0;
            double sw = Convert.ToDouble(width);
            double sh = Convert.ToDouble(height);
            double mw = Convert.ToDouble(maxWidth);
            double mh = Convert.ToDouble(maxHeight);

            if ( sw < mw && sh < mh )
            {
                w = sw;
                h = sh;
            }
            else if ( (sw/sh) > (mw/mh) )
            {
                w = maxWidth;
                h = (w * sh)/sw;
            }
            else
            {
                h = maxHeight;
                w = (h * sw)/sh;
            }

            return new Size(Convert.ToInt32(w), Convert.ToInt32(h));
        }

        private void SendSmallImage(string fileName, int maxWidth, int maxHeight)
        {
            System.Drawing.Image img = System.Drawing.Image.FromFile(Server.MapPath(fileName));

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