学步园

要实现的功能：一张照片，一张照片边框，一张背景相框，和几段文字合成为一张图片并保存。

先贴最终效果：

 

 

 核心就是GDI+中的几个方法（DrawImage,DrawString,DrawLine）。难点或者说麻烦一点的地方是头像照片和文字在背景图上的定位。

 直接贴上主方法：（抱歉，使用代码块就无法显示）

 

　　public string DealPic(string picPath, string bgPath,string whiteBgPath,string savePath,string to, string content,int userID,int picID)
        {
            double percent = 0.44;//397-(211+10)=176,176/397=44%--从TO(文字区域211,距离右侧10)开始的左侧区域占总区域397的百分比
            double wz_percent = 0.275;//70/255=0.275--文字距离上边70占总高度的百分比

            int fLen = 24;//"愿"和正文之间的距离
            int f_l_Len = 20;//字顶与横线之间距离
            int lLen = 30;//行距
            int l_r_Len = 27;//横线与最右侧边框的距离
            int w_Len = 7;//边框的宽度

            try
            {
                Image imgPic = GetImage(picPath);
                Image imgBg = GetImage(bgPath);
                Image imgWhiteBg = GetImage(whiteBgPath);

                Image newBG = imgBg.GetThumbnailImage(imgBg.Width, imgBg.Height, null, new IntPtr());
                Graphics g = Graphics.FromImage(imgBg);

                g.Clear(Color.White);

                double x_pic = (imgBg.Width * percent - imgPic.Width) / 2;
                double y_pic = (imgBg.Height - imgPic.Height) / 2;

                double x_white = x_pic - w_Len;
                double y_white = y_pic - w_Len;

                double x_wz = percent * imgBg.Width;
                double y_wz = wz_percent * imgBg.Height;

                

                // 指定高质量的双三次插值法。执行预筛选以确保高质量的收缩。此模式可产生质量最高的转换图像。
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.CompositingQuality = CompositingQuality.HighQuality;

                // 指定高质量、低速度呈现。
                g.SmoothingMode = SmoothingMode.HighQuality;

                //背景
                g.DrawImage(newBG, 0, 0, imgBg.Width, imgBg.Height);

                //照片
                int imgY = (imgBg.Height - imgPic.Height - w_Len * 2) / 2;
                g.DrawImage(imgPic, (int)x_pic, (int)y_pic, imgPic.Width, imgPic.Height);//x,y坐标根据初始css文件算出：x=left 8+padding 7=15;y=padding 7+ top 56=63

                //照片边框
                g.DrawImage(imgWhiteBg, (int)x_white, (int)y_white, imgPic.Width + w_Len * 2, imgPic.Height + w_Len * 2);//x,y坐标根据初始css文件算出：x=left 8;y=top 56,宽高各比照片大14px

                //文字
                Font fTo = new Font(new FontFamily("Tahoma"), 14, FontStyle.Regular, GraphicsUnit.Pixel);
                SolidBrush sbTo = new SolidBrush(Color.Black);
                g.DrawString("TO：", fTo, sbTo, (int)x_wz, (int)y_wz);
                g.DrawString(to, fTo, sbTo, (int)x_wz + fLen, (int)y_wz);

                Font fWish = new Font(new FontFamily("Tahoma"), 14, FontStyle.Regular, GraphicsUnit.Pixel);
                SolidBrush sbWish = new SolidBrush(Color.Black);
                g.DrawString("愿：", fWish, sbWish, (int)x_wz, (int)y_wz + lLen);

                Font f = new Font(new FontFamily("Tahoma"), 14, FontStyle.Regular, GraphicsUnit.Pixel);
                SolidBrush sb = new SolidBrush(Color.Black);

                //第一条横线：TO:___________
                g.DrawLine(new Pen(Color.Black), (int)x_wz + fLen, (int)y_wz + f_l_Len, imgBg.Width - l_r_Len, (int)y_wz + f_l_Len);

                List<string> list = GetContent(content);
                for (int i = 1; i < list.Count + 1; i++)
                {
                    g.DrawString(list[i - 1], f, sb, (int)x_wz + fLen, (int)y_wz + i * lLen);
                    g.DrawLine(new Pen(Color.Black), (int)x_wz + fLen, (int)y_wz + f_l_Len + i * lLen, imgBg.Width - l_r_Len, (int)y_wz + f_l_Len + i * lLen);
                }

                g.Dispose();

                //关键质量控制
                ImageCodecInfo jgpEncoder = GetImageEncoder(ImageFormat.Jpeg);
                EncoderParameters ep = new EncoderParameters(1);
                ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 85L);

                DirectoryInfo dir = new DirectoryInfo(savePath+userID.ToString());
                if (!dir.Exists)
                {
                    dir.Create();
                }

                string fileName = userID.ToString() + "_" + picID.ToString() + ".jpg";
                if (!new FileInfo(savePath + userID.ToString() + "/" + fileName).Exists)
                {
                    imgBg.Save(savePath + userID.ToString() + "/" + fileName, jgpEncoder, ep);                    
                }
                return fileName;

            }
            catch (Exception)
            {
                return string.Empty;
            }
        }

 

 

  2         {
  3             double percent = 0.44;//397-(211+10)=176,176/397=44%--从TO(文字区域211,距离右侧10)开始的左侧区域占总区域397的百分比
  4             double wz_percent = 0.275;//70/255=0.275--文字距离上边70占总高度的百分比
  5 
  6             int fLen = 24;//"愿"和正文之间的距离
  7             int f_l_Len = 20;//字顶与横线之间距离
  8             int lLen = 30;//行距
  9             int l_r_Len = 27;//横线与最右侧边框的距离
 10             int w_Len = 7;//边框的宽度
 11 
 12             try
 13             {
 14                 Image imgPic = GetImage(picPath);
 15                 Image imgBg = GetImage(bgPath);
 16                 Image imgWhiteBg = GetImage(whiteBgPath);
 17 
 18                 Image newBG = imgBg.GetThumbnailImage(imgBg.Width, imgBg.Height, null, new IntPtr());
 19                 Graphics g = Graphics.FromImage(imgBg);
 20 
 21                 g.Clear(Color.White);
 22 
 23 
 24                 double x_pic = (imgBg.Width * percent - imgPic.Width) / 2;
 25                 double y_pic = (imgBg.Height - imgPic.Height) / 2;
 26 
 27                 double x_white = x_pic - w_Len;
 28                 double y_white = y_pic - w_Len;
 29 
 30                 double x_wz = percent * imgBg.Width;
 31                 double y_wz = wz_percent * imgBg.Height;
 32 
 33                 
 34 
 35                 // 指定高质量的双三次插值法。执行预筛选以确保高质量的收缩。此模式可产生质量最高的转换图像。 
 36                 g.InterpolationMode = InterpolationMode.HighQualityBicubic;
 37                 g.CompositingQuality = CompositingQuality.HighQuality;
 38 
 39                 // 指定高质量、低速度呈现。 
 40                 g.SmoothingMode = SmoothingMode.HighQuality;
 41 
 42                 //背景
 43                 g.DrawImage(newBG, 0, 0, imgBg.Width, imgBg.Height);
 44 
 45                 //照片
 46                 int imgY = (imgBg.Height - imgPic.Height - w_Len * 2) / 2;
 47                 g.DrawImage(imgPic, (int)x_pic, (int)y_pic, imgPic.Width, imgPic.Height);//x,y坐标根据初始css文件算出：x=left 8+padding 7=15;y=padding 7+ top 56=63
 48 
 49                 //照片边框
 50                 g.DrawImage(imgWhiteBg, (int)x_white, (int)y_white, imgPic.Width + w_Len * 2, imgPic.Height + w_Len * 2);//x,y坐标根据初始css文件算出：x=left 8;y=top 56,宽高各比照片大14px
 51 
 52                 //文字
 53                 Font fTo = new Font(new FontFamily("Tahoma"), 14, FontStyle.Regular, GraphicsUnit.Pixel);
 54                 SolidBrush sbTo = new SolidBrush(Color.Black);
 55                 g.DrawString("TO：", fTo, sbTo, (int)x_wz, (int)y_wz);
 56                 g.DrawString(to, fTo, sbTo, (int)x_wz + fLen, (int)y_wz);
 57 
 58 
 59                 Font fWish = new Font(new FontFamily("Tahoma"), 14, FontStyle.Regular, GraphicsUnit.Pixel);
 60                 SolidBrush sbWish = new SolidBrush(Color.Black);
 61                 g.DrawString("愿：", fWish, sbWish, (int)x_wz, (int)y_wz + lLen);
 62 
 63 
 64 
 65                 Font f = new Font(new FontFamily("Tahoma"), 14, FontStyle.Regular, GraphicsUnit.Pixel);
 66                 SolidBrush sb = new SolidBrush(Color.Black);
 67 
 68                 //第一条横线：TO:___________
 69                 g.DrawLine(new Pen(Color.Black), (int)x_wz + fLen, (int)y_wz + f_l_Len, imgBg.Width - l_r_Len, (int)y_wz + f_l_Len);
 70 
 71 
 72                 List<string> list = GetContent(content);
 73                 for (int i = 1; i < list.Count + 1; i++)
 74                 {
 75                     g.DrawString(list[i - 1], f, sb, (int)x_wz + fLen, (int)y_wz + i * lLen);
 76                     g.DrawLine(new Pen(Color.Black), (int)x_wz + fLen, (int)y_wz + f_l_Len + i * lLen, imgBg.Width - l_r_Len, (int)y_wz + f_l_Len + i * lLen);
 77                 }
 78 
 79                 g.Dispose();
 80 
 81                 //关键质量控制
 82                 ImageCodecInfo jgpEncoder = GetImageEncoder(ImageFormat.Jpeg);
 83                 EncoderParameters ep = new EncoderParameters(1);
 84                 ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 85L);
 85 
 86                 DirectoryInfo dir = new DirectoryInfo(savePath+userID.ToString());
 87                 if (!dir.Exists)
 88                 {
 89                     dir.Create();
 90                 }
 91 
 92 
 93                 string fileName = userID.ToString() + "_" + picID.ToString() + ".jpg";
 94                 if (!new FileInfo(savePath + userID.ToString() + "/" + fileName).Exists)
 95                 {
 96                     imgBg.Save(savePath + userID.ToString() + "/" + fileName, jgpEncoder, ep);                    
 97                 }
 98                 return fileName;
 99 
100             }
101             catch (Exception)
102             {
103                 return string.Empty;
104             }
105         }
 其中一些数值常量是按照CSS测量或计算出来的。第36-37，第81行-84行代码保证了生成最终图片的质量。由于我不希望做成一个定宽定高的模式化计算方法，所以很多位置都是根据原始图片的宽高动态生成的，这样能保证不论多大的图片都可以生成在正确的位置。如果你喜欢的话，可以在左上角加上方块格子的图片，这样，明信片就完成了~至于一些中英文字符串截取之类的方法就不贴了，有何不足之处大家尽管指教。