生成缩略图是一个十分常用功能,找到了一个方法,重写部分代码,实用又好用,.net又一个生成缩略图的方法,不变形
1 /// <summary> 2 /// 为图片生成缩略图 by 何问起 3 /// </summary> 4 /// <param name="phyPath">原图片的路径</param> 5 /// <param name="width">缩略图宽</param> 6 /// <param name="height">缩略图高</param> 7 /// <returns></returns> 8 public System.Drawing.Image GetHvtThumbnail(System.Drawing.Image image, int width, int height) 9 {10 //代码是从开源项目HoverTreeCMS中获取的11 //更多信息请参考:http://hovertree.com/menu/hovertreecms/12 Bitmap m_hovertreeBmp = new Bitmap(width, height);13 //从Bitmap创建一个System.Drawing.Graphics 14 Graphics m_HvtGr = Graphics.FromImage(m_hovertreeBmp);15 //设置 16 m_HvtGr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;17 //下面这个也设成高质量 18 m_HvtGr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;19 //下面这个设成High 20 m_HvtGr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;21 //把原始图像绘制成上面所设置宽高的缩小图 22 Rectangle rectDestination = new Rectangle(0, 0, width, height);23 24 int m_width, m_height;25 if (image.Width * height > image.Height * width)26 {27 m_height = image.Height;28 m_width = (image.Height * width) / height;29 }30 else31 {32 m_width = image.Width;33 m_height = (image.Width * height) / width;34 }35 36 m_HvtGr.DrawImage(image, rectDestination, 0, 0, m_width, m_height, GraphicsUnit.Pixel);37 38 return m_hovertreeBmp;39 }
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