C#.NET 圖片水印添加代碼。本站提示廣大學習愛好者:(C#.NET 圖片水印添加代碼)文章只能為提供參考,不一定能成為您想要的結果。以下是C#.NET 圖片水印添加代碼正文
本文實例為年夜家分享了C#.NET添加 圖片水印的辦法,供年夜家參考,詳細內容以下
using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.IO; namespace Pub.Class { /// <summary> /// 添加水印類 只支撐添加圖片水印 /// </summary> public class Watermark { #region 公有成員 private string modifyImagePath=null; private string drawedImagePath=null; private int rightSpace; private int bottoamSpace; private int lucencyPercent=70; private string outPath=null; #endregion #region 結構器 /// <summary> /// 結構函數 /// </summary> public Watermark() { } #endregion #region 屬性 /// <summary> /// 獲得或設置要修正的圖象途徑 /// </summary> public string ModifyImagePath { get{return this.modifyImagePath;} set{this.modifyImagePath=value;} } /// <summary> /// 獲得或設置在畫的圖片途徑(水印圖片) /// </summary> public string DrawedImagePath { get{return this.drawedImagePath;} set{this.drawedImagePath=value;} } /// <summary> /// 獲得或設置水印在修正圖片中的左邊距 /// </summary> public int RightSpace { get{return this.rightSpace;} set{this.rightSpace=value;} } /// <summary> /// 獲得或設置水印在修正圖片中距底部的高度 /// </summary> public int BottoamSpace { get{return this.bottoamSpace;} set{this.bottoamSpace=value;} } /// <summary> /// 獲得或設置要繪制水印的通明度,留意是本來圖片通明度的百分比 /// </summary> public int LucencyPercent { get{return this.lucencyPercent;} set { if(value>=0&&value<=100) this.lucencyPercent=value; } } /// <summary> /// 獲得或設置要輸入圖象的途徑 /// </summary> public string OutPath { get{return this.outPath;} set{this.outPath=value;} } #endregion #region 開端繪制水印 DrawImage /// <summary> /// 開端繪制水印 /// </summary> /// <example> /// <code> /// Watermark wm = new Watermark(); /// wm.DrawedImagePath= Server.MapPath("") + "/upfile/" + "backlogo.gif"; /// wm.ModifyImagePath=path; /// wm.RightSpace=184; /// wm.BottoamSpace=81; /// wm.LucencyPercent=50; /// wm.OutPath=Server.MapPath("") + "/upfile/" + fileName + "_new" + extension; /// wm.DrawImage(); /// /// //保留加水印事後的圖片,刪除原始圖片 /// mFileName=fileName + "_new" + extension; /// if(File.Exists(path)) { File.Delete(path); } /// </code> /// </example> public void DrawImage() { Image modifyImage=null; Image drawedImage=null; Graphics g=null; try { modifyImage=Image.FromFile(this.ModifyImagePath);//樹立圖形對象 drawedImage=Image.FromFile(this.DrawedImagePath); g=Graphics.FromImage(modifyImage); int x=modifyImage.Width-this.rightSpace;//獲得要繪制圖形坐標 int y=modifyImage.Height-this.BottoamSpace; float[][] matrixItems ={//設置色彩矩陣 new float[] {1, 0, 0, 0, 0}, new float[] {0, 1, 0, 0, 0}, new float[] {0, 0, 1, 0, 0}, new float[] {0, 0, 0, (float)this.LucencyPercent/100f, 0}, new float[] {0, 0, 0, 0, 1}}; ColorMatrix colorMatrix = new ColorMatrix(matrixItems); ImageAttributes imgAttr=new ImageAttributes(); imgAttr.SetColorMatrix(colorMatrix,ColorMatrixFlag.Default,ColorAdjustType.Bitmap); g.DrawImage(//繪制暗影圖象 drawedImage, new Rectangle(x,y,drawedImage.Width,drawedImage.Height), 0,0,drawedImage.Width,drawedImage.Height, GraphicsUnit.Pixel,imgAttr); string[] allowImageType={".jpg",".gif",".png",".bmp",".tiff",".wmf",".ico"};//保留文件 FileInfo file=new FileInfo(this.ModifyImagePath); ImageFormat imageType=ImageFormat.Gif; switch(file.Extension.ToLower()) { case ".jpg": imageType=ImageFormat.Jpeg; break; case ".gif": imageType=ImageFormat.Gif; break; case ".png": imageType=ImageFormat.Png; break; case ".bmp": imageType=ImageFormat.Bmp; break; case ".tif": imageType=ImageFormat.Tiff; break; case ".wmf": imageType=ImageFormat.Wmf; break; case ".ico": imageType=ImageFormat.Icon; break; default: break; } MemoryStream ms=new MemoryStream(); modifyImage.Save(ms,imageType); byte[] imgData=ms.ToArray(); modifyImage.Dispose(); drawedImage.Dispose(); g.Dispose(); FileStream fs=null; if(this.OutPath==null || this.OutPath=="") { File.Delete(this.ModifyImagePath); fs=new FileStream(this.ModifyImagePath,FileMode.Create,FileAccess.Write); } else { fs=new FileStream(this.OutPath,FileMode.Create,FileAccess.Write); } if(fs!=null) { fs.Write(imgData,0,imgData.Length); fs.Close(); } } finally { try { drawedImage.Dispose(); modifyImage.Dispose(); g.Dispose(); } catch{} } } #endregion } }
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