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ASP.NET给图片加文字水印

时间:2013-9-19类别:编程学习

ASP.NET给图片加文字水印

ASP.NET给图片加文字水印

ASP.NET给图片加文字水印代码如下:

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  • C# 代码   复制
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        using System.IO;
        using System.Drawing;
        using System.Drawing.Imaging;
        using System.Drawing.Drawing2D;
        /// <summary>
        /// 文字水印处理方法
        /// </summary>
        /// <param name="path">图片路径(绝对路径)</param>
        /// <param name="size">字体大小</param>
        /// <param name="letter">水印文字</param>
        /// <param name="color">颜色</param>
        /// <param name="location">水印位置</param>
        public static string LetterWatermark(string path, int size, string letter, Color color, string location)
        {
            string kz_name = Path.GetExtension(path);
            if (kz_name == ".jpg" || kz_name == ".bmp" || kz_name == ".jpeg")
            {
                DateTime time = DateTime.Now;
                string filename = "" + time.Year.ToString() + time.Month.ToString() + time.Day.ToString() + time.Hour.ToString() + time.Minute.ToString() + time.Second.ToString() + time.Millisecond.ToString();
                Image img = Bitmap.FromFile(path);
                Graphics gs = Graphics.FromImage(img);
                ArrayList loca = GetLocation(location, img, size, letter.Length);
                Font font = new Font("宋体", size);
                Brush br = new SolidBrush(color);
                gs.DrawString(letter, font, br, float.Parse(loca[0].ToString()), float.Parse(loca[1].ToString()));
                gs.Dispose();
                string newpath = Path.GetDirectoryName(path) + filename + kz_name;
                img.Save(newpath);
                img.Dispose();
                File.Copy(newpath, path, true);
                if (File.Exists(newpath))
                {
                    File.Delete(newpath);
                }
            }
            return path;
        }
    
        /// <summary>
        /// 文字水印位置的方法
        /// </summary>
        /// <param name="location">位置代码</param>
        /// <param name="img">图片对象</param>
        /// <param name="width">宽(当水印类型为文字时,传过来的就是字体的大小)</param>
        /// <param name="height">高(当水印类型为文字时,传过来的就是字符的长度)</param>
        private static ArrayList GetLocation(string location, Image img, int width, int height)
        {
            ArrayList loca = new ArrayList();  //定义数组存储位置
            float x = 10;
            float y = 10;
    
            if (location == "LT")
            {
                loca.Add(x);
                loca.Add(y);
            }
            else if (location == "T")
            {
                x = img.Width / 2 - (width * height) / 2;
                loca.Add(x);
                loca.Add(y);
            }
            else if (location == "RT")
            {
                x = img.Width - width * height;
            }
            else if (location == "LC")
            {
                y = img.Height / 2;
            }
            else if (location == "C")
            {
                x = img.Width / 2 - (width * height) / 2;
                y = img.Height / 2;
            }
            else if (location == "RC")
            {
                x = img.Width - height;
                y = img.Height / 2;
            }
            else if (location == "LB")
            {
                y = img.Height - width - 5;
            }
            else if (location == "B")
            {
                x = img.Width / 2 - (width * height) / 2;
                y = img.Height - width - 5;
            }
            else
            {
                x = img.Width - width * height;
                y = img.Height - width - 5;
            }
            loca.Add(x);
            loca.Add(y);
            return loca;
        }
    					

     

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