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  • ASP.NET(C#)图片加文字、图片水印

     
    /* 
     * Class:WaterImage 
     * Use for add a water Image to the picture both words and image 
     * 2007.07.23   create the file 
     
     * http://www.freeatom.com/  欢迎您的来访 
     *  
     * 使用说明: 
     *  建议先定义一个WaterImage实例 
     *  然后利用实例的属性,去匹配需要进行操作的参数 
     *  然后定义一个WaterImageManage实例 
     *  利用WaterImageManage实例进行DrawImage(),印图片水印 
     *  DrawWords()印文字水印 
     *  
    -*/  
        
    using System;  
    using System.Drawing;  
    using System.Drawing.Imaging;  
    using System.Drawing.Drawing2D;  
    using System.IO;  
    /// <summary>  
    /// 图片位置  
    /// </summary>  
    public enum ImagePosition  
    {  
        LeftTop,        //左上  
        LeftBottom,    //左下  
        RightTop,       //右上  
        RigthBottom,  //右下  
        TopMiddle,     //顶部居中  
        BottomMiddle, //底部居中  
        Center           //中心  
    }  
        
    /// <summary>  
    /// 水印图片的操作管理 Design by Gary Gong From Demetersoft.com  
    /// </summary>  
    public class WaterImageManage  
    {  
        /// <summary>  
        /// 生成一个新的水印图片制作实例  
        /// </summary>  
        public WaterImageManage ()  
        {  
            //  
            // TODO: Add constructor logic here  
            //  
        }  
        
        /// <summary>  
        /// 添加图片水印  
        /// </summary>  
        /// <param name="sourcePicture">源图片文件名</param>  
        /// <param name="waterImage">水印图片文件名</param>  
        /// <param name="alpha">透明度(0.1-1.0数值越小透明度越高)</param>  
        /// <param name="position">位置</param>  
        /// <param name="PicturePath" >图片的路径</param>  
        /// <returns>返回生成于指定文件夹下的水印文件名</returns>  
        public string  DrawImage(string sourcePicture,  
                                          string waterImage,  
                                          float alpha,  
                                          ImagePosition position,  
                                          string PicturePath )  
        {  
            //  
            // 判断参数是否有效  
            //  
            if (sourcePicture == string.Empty || waterImage == string.Empty || alpha == 0.0 || PicturePath == string.Empty)  
            {  
                return sourcePicture;  
            }  
        
            //  
            // 源图片,水印图片全路径  
            //  
            string sourcePictureName = PicturePath + sourcePicture;  
            string waterPictureName = PicturePath + waterImage;  
            string fileSourceExtension = System.IO.Path.GetExtension(sourcePictureName).ToLower();  
            string fileWaterExtension = System.IO.Path.GetExtension(waterPictureName).ToLower();  
            //  
            // 判断文件是否存在,以及类型是否正确  
            //  
            if (System.IO.File.Exists(sourcePictureName) == false ||   
                System.IO.File.Exists(waterPictureName) == false ||(  
                fileSourceExtension != ".gif" &&  
                fileSourceExtension != ".jpg" &&  
                fileSourceExtension != ".png") || (  
                fileWaterExtension != ".gif" &&  
                fileWaterExtension != ".jpg" &&  
                fileWaterExtension != ".png")  
                )  
            {  
                return sourcePicture;  
            }  
        
            //  
            // 目标图片名称及全路径  
            //  
            string targetImage = sourcePictureName.Replace ( System.IO.Path.GetExtension(sourcePictureName),"") + "_1101.jpg";  
        
            //  
            // 将需要加上水印的图片装载到Image对象中  
            //  
            Image imgPhoto = Image.FromFile(sourcePictureName);  
            //  
            // 确定其长宽  
            //  
            int phWidth = imgPhoto.Width;  
            int phHeight = imgPhoto.Height;  
        
            //  
            // 封装 GDI+ 位图,此位图由图形图像及其属性的像素数据组成。  
            //  
            Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);  
        
            //  
            // 设定分辨率  
            //   
            bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);  
        
            //  
            // 定义一个绘图画面用来装载位图  
            //  
            Graphics grPhoto = Graphics.FromImage(bmPhoto);  
        
            //  
            //同样,由于水印是图片,我们也需要定义一个Image来装载它  
            //  
            Image imgWatermark = new Bitmap(waterPictureName);  
                
            //  
            // 获取水印图片的高度和宽度  
            //  
            int wmWidth = imgWatermark.Width;  
            int wmHeight = imgWatermark.Height;  
        
            //SmoothingMode:指定是否将平滑处理(消除锯齿)应用于直线、曲线和已填充区域的边缘。  
            // 成员名称   说明   
            // AntiAlias      指定消除锯齿的呈现。    
            // Default        指定不消除锯齿。    
            // HighQuality  指定高质量、低速度呈现。    
            // HighSpeed   指定高速度、低质量呈现。    
            // Invalid        指定一个无效模式。    
            // None          指定不消除锯齿。   
            grPhoto.SmoothingMode = SmoothingMode.AntiAlias;  
        
            //  
            // 第一次描绘,将我们的底图描绘在绘图画面上  
            //  
            grPhoto.DrawImage(imgPhoto,                                            
                                        new Rectangle(0, 0, phWidth, phHeight),   
                                        0,       
                                        0,         
                                        phWidth,     
                                        phHeight,        
                                        GraphicsUnit.Pixel);      
        
            //  
            // 与底图一样,我们需要一个位图来装载水印图片。并设定其分辨率  
            //  
            Bitmap bmWatermark = new Bitmap(bmPhoto);  
            bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);  
                
            //  
            // 继续,将水印图片装载到一个绘图画面grWatermark  
            //  
            Graphics grWatermark = Graphics.FromImage(bmWatermark);  
        
            //  
            //ImageAttributes 对象包含有关在呈现时如何操作位图和图元文件颜色的信息。  
            //         
            ImageAttributes imageAttributes = new ImageAttributes();  
        
            //  
            //Colormap: 定义转换颜色的映射  
            //  
            ColorMap colorMap = new ColorMap();  
        
            //  
            //我的水印图被定义成拥有绿色背景色的图片被替换成透明  
            //  
            colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);  
            colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);  
        
            ColorMap[] remapTable = { colorMap };  
        
            imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);  
        
            float[][] colorMatrixElements = {   
               new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f}, // red红色  
               new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f}, //green绿色  
               new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f}, //blue蓝色         
               new float[] {0.0f,  0.0f,  0.0f,  alpha, 0.0f}, //透明度       
               new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}};//  
        
            //  ColorMatrix:定义包含 RGBA 空间坐标的 5 x 5 矩阵。  
            //  ImageAttributes 类的若干方法通过使用颜色矩阵调整图像颜色。  
            ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);  
        
        
            imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,  
             ColorAdjustType.Bitmap);  
        
            //  
            //上面设置完颜色,下面开始设置位置  
            //  
            int xPosOfWm;  
            int yPosOfWm;   
        
            switch (position)  
            {  
                case ImagePosition .BottomMiddle :  
                    xPosOfWm = (phWidth-wmWidth ) / 2 ;  
                    yPosOfWm = phHeight- wmHeight -10;  
                    break ;  
                case ImagePosition .Center :  
                    xPosOfWm = (phWidth - wmWidth) / 2;  
                    yPosOfWm = (phHeight-wmHeight ) / 2;  
                    break ;  
                case ImagePosition .LeftBottom :  
                    xPosOfWm = 10;  
                    yPosOfWm = phHeight - wmHeight - 10;  
                    break ;  
                case ImagePosition .LeftTop :  
                    xPosOfWm = 10;  
                    yPosOfWm = 10;  
                    break;  
                case ImagePosition .RightTop :  
                    xPosOfWm = phWidth - wmWidth - 10;  
                    yPosOfWm = 10;  
                    break ;  
                case ImagePosition .RigthBottom :  
                    xPosOfWm = phWidth - wmWidth - 10;  
                    yPosOfWm = phHeight - wmHeight - 10;  
                    break ;  
                case ImagePosition.TopMiddle :  
                    xPosOfWm = (phWidth - wmWidth) / 2;  
                    yPosOfWm = 10;  
                    break ;  
                default:  
                    xPosOfWm = 10;  
                    yPosOfWm = phHeight - wmHeight - 10;  
                    break;  
            }  
        
            //  
            // 第二次绘图,把水印印上去  
            //  
            grWatermark.DrawImage(imgWatermark,  
             new Rectangle(xPosOfWm,  
                                 yPosOfWm,  
                                 wmWidth,  
                                 wmHeight),   
                                 0,                
                                 0,            
                                 wmWidth,    
                                 wmHeight,     
                                 GraphicsUnit.Pixel,    
                                 imageAttributes);   
        
               
            imgPhoto = bmWatermark;  
            grPhoto.Dispose();  
            grWatermark.Dispose();  
        
            //  
            // 保存文件到服务器的文件夹里面  
            //  
            imgPhoto.Save(targetImage, ImageFormat.Jpeg);  
            imgPhoto.Dispose();  
            imgWatermark.Dispose();  
            return targetImage.Replace (PicturePath,"");  
        }  
        
        /// <summary>  
        /// 在图片上添加水印文字  
        /// </summary>  
        /// <param name="sourcePicture">源图片文件</param>  
        /// <param name="waterWords">需要添加到图片上的文字</param>  
        /// <param name="alpha">透明度</param>  
        /// <param name="position">位置</param>  
        /// <param name="PicturePath">文件路径</param>  
        /// <returns></returns>  
        public string DrawWords(string sourcePicture,  
                                          string waterWords,  
                                          float alpha,  
                                          ImagePosition position,  
                                          string PicturePath)  
        {  
            //  
            // 判断参数是否有效  
            //  
            if (sourcePicture == string.Empty || waterWords == string.Empty || alpha == 0.0 || PicturePath == string.Empty)  
            {  
                return sourcePicture;  
            }  
        
            //  
            // 源图片全路径  
            //  
            string sourcePictureName = PicturePath + sourcePicture;  
            string fileExtension = System.IO.Path.GetExtension(sourcePictureName).ToLower();  
        
            //  
            // 判断文件是否存在,以及文件名是否正确  
            //  
            if (System.IO.File.Exists(sourcePictureName) == false || (  
                fileExtension != ".gif"  &&  
                fileExtension != ".jpg" &&  
                fileExtension != ".png" ))  
            {  
                return sourcePicture;  
            }  
        
            //  
            // 目标图片名称及全路径  
            //  
            string targetImage = sourcePictureName.Replace(System.IO.Path.GetExtension(sourcePictureName), "") + "_0703.jpg";  
        
            //创建一个图片对象用来装载要被添加水印的图片  
            Image imgPhoto = Image.FromFile(sourcePictureName);  
        
            //获取图片的宽和高  
            int phWidth = imgPhoto.Width;  
            int phHeight = imgPhoto.Height;  
        
            //  
            //建立一个bitmap,和我们需要加水印的图片一样大小  
            Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);  
        
            //SetResolution:设置此 Bitmap 的分辨率  
            //这里直接将我们需要添加水印的图片的分辨率赋给了bitmap  
            bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);  
        
            //Graphics:封装一个 GDI+ 绘图图面。  
            Graphics grPhoto = Graphics.FromImage(bmPhoto);  
        
            //设置图形的品质  
            grPhoto.SmoothingMode = SmoothingMode.AntiAlias;  
        
            //将我们要添加水印的图片按照原始大小描绘(复制)到图形中  
            grPhoto.DrawImage(  
             imgPhoto,                                           //   要添加水印的图片  
             new Rectangle(0, 0, phWidth, phHeight), //  根据要添加的水印图片的宽和高  
             0,                                                     //  X方向从0点开始描绘  
             0,                                                     // Y方向   
             phWidth,                                            //  X方向描绘长度  
             phHeight,                                           //  Y方向描绘长度  
             GraphicsUnit.Pixel);                              // 描绘的单位,这里用的是像素  
        
            //根据图片的大小我们来确定添加上去的文字的大小  
            //在这里我们定义一个数组来确定  
            int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };  
        
            //字体  
            Font crFont = null;  
            //矩形的宽度和高度,SizeF有三个属性,分别为Height高,width宽,IsEmpty是否为空  
            SizeF crSize = new SizeF();  
        
            //利用一个循环语句来选择我们要添加文字的型号  
            //直到它的长度比图片的宽度小  
            for (int i = 0; i < 7; i++)  
            {  
                crFont = new Font("arial", sizes[i], FontStyle.Bold);  
        
                //测量用指定的 Font 对象绘制并用指定的 StringFormat 对象格式化的指定字符串。  
                crSize = grPhoto.MeasureString(waterWords, crFont);  
        
                // ushort 关键字表示一种整数数据类型  
                if ((ushort)crSize.Width < (ushort)phWidth)  
                    break;  
            }  
        
            //截边5%的距离,定义文字显示(由于不同的图片显示的高和宽不同,所以按百分比截取)  
            int yPixlesFromBottom = (int)(phHeight * .05);  
        
            //定义在图片上文字的位置  
            float wmHeight =  crSize.Height;  
            float wmWidth = crSize .Width ;  
        
            float  xPosOfWm;  
            float  yPosOfWm;   
        
            switch (position)  
            {  
                case ImagePosition .BottomMiddle :  
                    xPosOfWm = phWidth / 2 ;  
                    yPosOfWm = phHeight- wmHeight -10;  
                    break ;  
                case ImagePosition .Center :  
                    xPosOfWm = phWidth / 2;  
                    yPosOfWm = phHeight / 2;  
                    break ;  
                case ImagePosition .LeftBottom :  
                    xPosOfWm = wmWidth;  
                    yPosOfWm = phHeight - wmHeight - 10;  
                    break ;  
                case ImagePosition .LeftTop :  
                    xPosOfWm = wmWidth/2 ;  
                    yPosOfWm = wmHeight / 2;  
                    break;  
                case ImagePosition .RightTop :  
                    xPosOfWm = phWidth - wmWidth - 10;  
                    yPosOfWm = wmHeight;  
                    break ;  
                case ImagePosition .RigthBottom :  
                    xPosOfWm = phWidth - wmWidth - 10;  
                    yPosOfWm = phHeight - wmHeight - 10;  
                    break ;  
                case ImagePosition.TopMiddle :  
                    xPosOfWm = phWidth / 2;  
                    yPosOfWm = wmWidth;  
                    break ;  
                default:  
                    xPosOfWm = wmWidth;  
                    yPosOfWm = phHeight - wmHeight - 10;  
                    break;  
            }  
        
            //封装文本布局信息(如对齐、文字方向和 Tab 停靠位),显示操作(如省略号插入和国家标准 (National) 数字替换)和 OpenType 功能。  
            StringFormat StrFormat = new StringFormat();  
        
            //定义需要印的文字居中对齐  
            StrFormat.Alignment = StringAlignment.Center;  
        
            //SolidBrush:定义单色画笔。画笔用于填充图形形状,如矩形、椭圆、扇形、多边形和封闭路径。  
            //这个画笔为描绘阴影的画笔,呈灰色  
            int m_alpha = Convert .ToInt32 ( 256 * alpha);  
            SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(m_alpha, 0, 0, 0));  
        
            //描绘文字信息,这个图层向右和向下偏移一个像素,表示阴影效果  
            //DrawString 在指定矩形并且用指定的 Brush 和 Font 对象绘制指定的文本字符串。  
            grPhoto.DrawString(waterWords,                                    //string of text  
                                       crFont,                                         //font  
                                       semiTransBrush2,                            //Brush  
                                       new PointF(xPosOfWm + 1, yPosOfWm + 1),  //Position  
                                       StrFormat);  
        
            //从四个 ARGB 分量(alpha、红色、绿色和蓝色)值创建 Color 结构,这里设置透明度为153  
            //这个画笔为描绘正式文字的笔刷,呈白色  
            SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));  
        
            //第二次绘制这个图形,建立在第一次描绘的基础上  
            grPhoto.DrawString(waterWords,                 //string of text  
                                       crFont,                                   //font  
                                       semiTransBrush,                           //Brush  
                                       new PointF(xPosOfWm, yPosOfWm),  //Position  
                                       StrFormat);  
        
            //imgPhoto是我们建立的用来装载最终图形的Image对象  
            //bmPhoto是我们用来制作图形的容器,为Bitmap对象  
            imgPhoto = bmPhoto;  
            //释放资源,将定义的Graphics实例grPhoto释放,grPhoto功德圆满  
            grPhoto.Dispose();  
        
            //将grPhoto保存  
            imgPhoto.Save(targetImage, ImageFormat.Jpeg);  
            imgPhoto.Dispose();  
        
            return targetImage.Replace(PicturePath, "");  
        }  
    }  
        
    /// <summary>  
    /// 装载水印图片的相关信息  
    /// </summary>  
    public class WaterImage  
    {  
        public WaterImage ()  
        {  
        
        }  
        
        private string m_sourcePicture;  
        /// <summary>  
        /// 源图片地址名字(带后缀)  
        /// </summary>  
        public string SourcePicture  
        {  
            get { return m_sourcePicture; }  
            set { m_sourcePicture = value; }  
        }  
        
        private string  m_waterImager;  
        /// <summary>  
        /// 水印图片名字(带后缀)  
        /// </summary>  
        public string  WaterPicture  
        {  
            get { return m_waterImager; }  
            set { m_waterImager = value; }  
        }  
        
        private float  m_alpha;  
        /// <summary>  
        /// 水印图片文字的透明度  
        /// </summary>  
        public float  Alpha  
        {  
            get { return m_alpha; }  
            set { m_alpha = value; }  
        }  
        
        private ImagePosition  m_postition;  
        /// <summary>  
        /// 水印图片或文字在图片中的位置  
        /// </summary>  
        public ImagePosition  Position  
        {  
            get { return m_postition; }  
            set { m_postition = value; }  
        }  
        
        private string  m_words;  
        /// <summary>  
        /// 水印文字的内容  
        /// </summary>  
        public string  Words  
        {  
            get { return m_words; }  
            set { m_words = value; }  
        }  
             
    }
     
     
    文章转自:http://www.cnblogs.com/hulang/archive/2010/12/19/1910513.html
    在图片上添加水印文字部分 亲测可用
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  • 原文地址:https://www.cnblogs.com/z-hj/p/6001835.html
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