| using System; using System.Data; using System.Data.SqlClient; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Text; using System.Text.RegularExpressions; using System.Drawing; using System.Drawing.Imaging; using System.Collections; using System.ComponentModel; namespace Legalsoft.Images { /// <summary> /// News 的摘要說(shuō)明 /// </summary> public class XImage { public Color tBackground; public Color tBorder; public Color tShadow; public int tQuality; public string markPosition; /// <summary> /// 圖片參數(shù)預(yù)定義 /// </summary> static Hashtable htmimes = new Hashtable(); internal readonly string AllowExt = ".jpe|.jpeg|.jpg|.png|.tif|.tiff|.bmp|.gif"; public XImage() { tBackground = Color.Transparent; tBorder = Color.Transparent; tShadow = Color.Transparent; tQuality = 100; markPosition = "左下角"; #region 圖片類型預(yù)定義 htmimes[".jpe"]="image/jpeg"; htmimes[".jpeg"] = "image/jpeg"; htmimes[".jpg"] = "image/jpeg"; htmimes[".png"] = "image/png"; htmimes[".tif"] = "image/tiff"; htmimes[".tiff"] = "image/tiff"; htmimes[".bmp"] = "image/bmp"; htmimes[".gif"] = "image/gif"; #endregion } #region 下載指定URL圖片并保存 /// <summary> /// 下載指定URL的文件并保存到指定目錄 /// </summary> /// <param name="strUrl"></param> public void DownloadImage(string strUrl, string file) { System.Net.WebClient wc = new System.Net.WebClient(); wc.DownloadFile(strUrl, file); } #endregion #region C#自動(dòng)生成縮略圖 /// <summary> /// 按給定名字確定顏色 /// </summary> /// <param name="name"></param> /// <returns></returns> public Color ToColor(string name) { if (name == "白色") return Color.White; if (name == "紅色") return Color.Red; if (name == "藍(lán)色") return Color.Blue; if (name == "綠色") return Color.Green; if (name == "黑色") return Color.Black; if (name == "灰色") return Color.DarkGray; if (name == "黃色") return Color.Yellow; if (name == "紫色") return Color.Cyan; if (name == "無(wú)色") return Color.Transparent; return Color.Transparent; } /// <summary> /// 按名字設(shè)置各種顏色，可以自行擴(kuò)充:) /// </summary> /// <param name="name"></param> /// <returns></returns> public int ToQuality(string name) { return Int32.Parse(name.Replace("%", "")); } /// <summary> /// 獲取圖像編碼解碼器的所有相關(guān)信息 /// </summary> /// <param name="mimeType">包含編碼解碼器的多用途網(wǎng)際郵件擴(kuò)充協(xié)議 (MIME) 類型的字符串</param> /// <returns>返回圖像編碼解碼器的所有相關(guān)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> /// 檢測(cè)擴(kuò)展名的有效性 /// </summary> /// <param name="sExt">文件名擴(kuò)展名</param> /// <returns>如果擴(kuò)展名有效,返回true,否則返回false.</returns> private bool CheckValidExt(string sExt) { bool flag = false; string[] aExt = AllowExt.Split("|"); foreach (string filetype in aExt) { if (filetype.ToLower() == sExt) { flag = true; break; } } return flag; } /// <summary> /// 保存圖片 /// </summary> /// <param name="image">Image 對(duì)象</param> /// <param name="savePath">保存路徑</param> /// <param name="ici">指定格式的編解碼參數(shù)</param> private void SaveImage(System.Drawing.Image image, string savePath, ImageCodecInfo ici) { //設(shè)置 原圖片 對(duì)象的 EncoderParameters 對(duì)象 EncoderParameters parameters = new EncoderParameters(1); parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)tQuality)); image.Save(savePath, ici, parameters); parameters.Dispose(); } /// <summary> /// 生成縮略圖 /// </summary> /// <param name="sourceImagePath">原圖片路徑(相對(duì)路徑)</param> /// <param name="thumbnailImagePath">生成的縮略圖路徑,如果為空則保存為原圖片路徑(相對(duì)路徑)</param> /// <param name="thumbnailImageWidth">縮略圖的寬度（高度與按源圖片比例自動(dòng)生成）</param> public void ToThumbnail(string sourceImagePath, string thumbnailImagePath, int thumbnailImageWidth, int thumbnailImageHeight ) { // 1.先檢查圖片格式等信息 string ThumbnailImagePath = thumbnailImagePath; string SourceImagePath = sourceImagePath; string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower(); if (SourceImagePath.ToString() == System.String.Empty) { throw new NullReferenceException("SourceImagePath is null!"); } if (!CheckValidExt(sExt)) { throw new ArgumentException("原圖片文件格式不正確,支持的格式有[ " + AllowExt + " ]", "SourceImagePath"); } // 從原圖片創(chuàng)建 Image 對(duì)象 System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(SourceImagePath)); // 2.計(jì)算圖片的位置、尺寸等信息 int tWidth, tHeight, tLeft, tTop; double fScale = (double)thumbnailImageHeight / (double)thumbnailImageWidth; // 高度寬度比 if (((double)image.Width * fScale) > (double)image.Height) // 如果原圖比較寬 { tWidth = thumbnailImageWidth; tHeight = (int)((double)image.Height * (double)tWidth / (double)image.Width); tLeft = 0; tTop = (thumbnailImageHeight-tHeight)/2; } else { tHeight = thumbnailImageHeight; tWidth = (int)((double)image.Width * (double)tHeight / (double)image.Height); tLeft = (thumbnailImageWidth-tWidth)/2; tTop = 0; } if (tLeft < 0) tLeft = 0; if (tTop < 0) tTop = 0; if (tBorder != Color.Transparent) { tWidth -= 2; tHeight -= 2; tLeft++; tTop++; } if (tShadow != Color.Transparent) { tWidth -= 1; tHeight -= 1; } //用指定的大小和格式初始化 Bitmap 類的新實(shí)例 //Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num, PixelFormat.Format32bppArgb); Bitmap bitmap = new Bitmap(thumbnailImageWidth, thumbnailImageHeight, PixelFormat.Format32bppArgb); //從指定的 Image 對(duì)象創(chuàng)建新 Graphics 對(duì)象 Graphics graphics = Graphics.FromImage(bitmap); //清除整個(gè)繪圖面并以透明背景色填充 if (tBackground != Color.Transparent) { graphics.Clear(tBackground); } else { graphics.Clear(Color.Transparent); } // 添加陰影 if (tShadow != Color.Transparent) { Pen shPen = new Pen(tShadow); graphics.DrawLine(shPen, new Point(1, thumbnailImageHeight-1), new Point(thumbnailImageWidth-1, thumbnailImageHeight-1)); graphics.DrawLine(shPen, new Point(thumbnailImageWidth-1, 1), new Point(thumbnailImageWidth-1, thumbnailImageHeight-1)); } // 添加邊框 if (tBorder != Color.Transparent) { Pen bdPen = new Pen(tBorder); if (tShadow != Color.Transparent) { graphics.DrawRectangle(bdPen, new Rectangle(0, 0, thumbnailImageWidth-2, thumbnailImageHeight-2)); } else { graphics.DrawRectangle(bdPen, new Rectangle(0, 0, thumbnailImageWidth-1, thumbnailImageHeight-1)); } } //在指定位置并且按指定大小繪制 原圖片 對(duì)象 graphics.DrawImage(image, new Rectangle(tLeft, tTop, tWidth, tHeight)); image.Dispose(); try { //將此 原圖片 以指定格式并用指定的編解碼參數(shù)保存到指定文件 string savepath = (ThumbnailImagePath == null ? SourceImagePath : ThumbnailImagePath); SaveImage(bitmap, HttpContext.Current.Server.MapPath(savepath), GetCodecInfo((string)htmimes[sExt])); } catch (System.Exception e) { throw e; } finally { bitmap.Dispose(); graphics.Dispose(); } } #endregion #region C#給圖片添加水印 public void Mark(string sourceImagePath, string markString) { // 1.先檢查圖片格式等信息 string markImagePath = sourceImagePath; string SourceImagePath = sourceImagePath; string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(".")).ToLower(); if (SourceImagePath.ToString() == System.String.Empty) { throw new NullReferenceException("SourceImagePath is null!"); } if (!CheckValidExt(sExt)) { throw new ArgumentException("原圖片文件格式不正確,支持的格式有[ " + AllowExt + " ]", "SourceImagePath"); } // 從原圖片創(chuàng)建 Image 對(duì)象 System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(SourceImagePath)); //用指定的大小和格式初始化 Bitmap 類的新實(shí)例 Bitmap bitmap = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppArgb); //從指定的 Image 對(duì)象創(chuàng)建新 Graphics 對(duì)象 Graphics graphics = Graphics.FromImage(bitmap); //在指定位置并且按指定大小繪制 原圖片 對(duì)象 graphics.DrawImage(image, new Rectangle(0, 0, image.Width, image.Height)); #region 繪制水印 // 設(shè)置水印字體 int fHeight = image.Height/5; if(fHeight>16) fHeight = 16; Font drawFont = new Font("Arial", fHeight); // 設(shè)置水印文字位置，默認(rèn)為左下角 float x = 4; float y = image.Height - drawFont.Height - 4; if (markPosition == "左上角") { y = 4; } if (markPosition == "右上角") { x = image.Width - markString.Length * fHeight / 2 - fHeight; y = 4; } if (markPosition == "右下角") { x = image.Width - markString.Length * fHeight / 2 - fHeight; } if (markPosition == "圖片中間") { x = image.Width / 2 - markString.Length * fHeight / 2; y = image.Height / 2 - fHeight / 2; } StringFormat drawFormat = new StringFormat(); drawFormat.FormatFlags = StringFormatFlags.NoWrap; // 設(shè)置水印文字顏色，先繪制一個(gè)黑色字作為陰影，再繪制白色字，這樣比較顯眼； SolidBrush drawBrush = new SolidBrush(Color.Black); graphics.DrawString(markString, drawFont, drawBrush, x, y, drawFormat); drawBrush.Color = Color.White; graphics.DrawString(markString, drawFont, drawBrush, x-1, y-1, drawFormat); #endregion image.Dispose(); try { //將此 原圖片 以指定格式并用指定的編解碼參數(shù)保存到指定文件 string savepath = SourceImagePath; SaveImage(bitmap, HttpContext.Current.Server.MapPath(savepath), GetCodecInfo((string)htmimes[sExt])); } catch (System.Exception e) { throw e; } finally { bitmap.Dispose(); graphics.Dispose(); } } #endregion } |
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