using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.Linq; using System.Text; using System.Threading.Tasks; namespace treads { /// <summary> /// 制作小正方形 /// </summary> class Class3 { private string srcFileName = @"x";//获取图片的路径 private string srcFileName1 = @"x";//要保持图片的新路径 /// <summary> /// 保存图片 /// </summary> /// <param name="image">Image 对象</param> /// <param name="savePath">保存路径</param> /// <param name="ici">指定格式的编解码参数</param> private static void SaveImage(Image image, string savePath, ImageCodecInfo ici) { //设置 原图片 对象的 EncoderParameters 对象 EncoderParameters parameters = new EncoderParameters(1); parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)100)); image.Save(savePath, ici, parameters); parameters.Dispose(); } /// <summary> /// 获取图像编码解码器的所有相关信息 /// </summary> /// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param> /// <returns>返回图像编码解码器的所有相关信息</returns> private static ImageCodecInfo GetCodecInfo(string mimeType) { ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders(); foreach (ImageCodecInfo ici in CodecInfo) { if (ici.MimeType == mimeType) return ici; } return null; } /// <summary> /// 计算新尺寸 /// </summary> /// <param name="width">原始宽度</param> /// <param name="height">原始高度</param> /// <param name="maxWidth">最大新宽度</param> /// <param name="maxHeight">最大新高度</param> /// <returns></returns> private static Size ResizeImage(int width, int height, int maxWidth, int maxHeight) { //此次修改过================= if (maxWidth <= 0) maxWidth = width; if (maxHeight <= 0) maxHeight = height; //以上修改过================= decimal MAX_WIDTH = (decimal)maxWidth; decimal MAX_HEIGHT = (decimal)maxHeight; decimal ASPECT_RATIO = MAX_WIDTH / MAX_HEIGHT; int newWidth, newHeight; decimal originalWidth = (decimal)width; decimal originalHeight = (decimal)height; if (originalWidth > MAX_WIDTH || originalHeight > MAX_HEIGHT) { decimal factor; // determine the largest factor if (originalWidth / originalHeight > ASPECT_RATIO) { factor = originalWidth / MAX_WIDTH; newWidth = Convert.ToInt32(originalWidth / factor); newHeight = Convert.ToInt32(originalHeight / factor); } else { factor = originalHeight / MAX_HEIGHT; newWidth = Convert.ToInt32(originalWidth / factor); newHeight = Convert.ToInt32(originalHeight / factor); } } else { newWidth = width; newHeight = height; } return new Size(newWidth, newHeight); } /// <summary> /// 得到图片格式 /// </summary> /// <param name="name">文件名称</param> /// <returns></returns> public static ImageFormat GetFormat(string name) { string ext = name.Substring(name.LastIndexOf(".") + 1); switch (ext.ToLower()) { case "jpg": case "jp