C#图像处理（1）：在图片上加文字和改变文字的方向
C#在图片上加文字，代码如下：
1 /// <summary> 2 /// 图片上方加文字，文字将会被180度反转 3 /// </summary> 4 /// <param name="Img">待处理图片</param> 5 /// <param name="WriteString">写入的字符串</param> 6 /// <param name="UpMargin">180度反转后文字顶部距离上边缘距离</param> 7 /// <param name="RightMargin">文字最左边距离右边缘距离</param> 8 /// <returns>Bitmap</returns> 9 public Bitmap WriteUp(Image Img, string WriteString, int UpMargin, int RightMargin) 10 { 11 return WriteUp(Img, WriteString, UpMargin, RightMargin, "宋体", 20); 12 } 13 14 /// <summary> 15 /// 图片上方加文字，文字将会被180度反转 16 /// </summary> 17 /// <param name="Img">待处理图片</param> 18 /// <param name="WriteString">写入的字符串</param> 19 /// <param name="UpMargin">180度反转后文字顶部距离上边缘距离</param> 20 /// <param name="RightMargin">文字最左边距离右边缘距离</param> 21 /// <param name="FontType">字体类型</param> 22 /// <param name="FontSize">字体大小</param> 23 /// <returns></returns> 24 public Bitmap WriteUp(Image Img, string WriteString, int UpMargin, int RightMargin, string FontType, int FontSize) 25 { 26 //获取图片宽高 27 int Width = Img.Width; 28 int Height = Img.Height; 29 //获取图片水平和垂直的分辨率 30 float dpiX = Img.HorizontalResolution; 31 float dpiY = Img.VerticalResolution; 32 //创建一个位图文件 33 Bitmap BitmapResult = new Bitmap(Width, Height, PixelFormat.Format24bppRgb); 34 //设置位图文件的水平和垂直分辨率 与Img一致 35 BitmapResult.SetResolution(dpiX, dpiY); 36 //在位图文件上填充一个矩形框 37 Graphics Grp = Graphics.FromImage(BitmapResult); 38 System.Drawing.Rectangle Rec = new System.Drawing.Rectangle(0, 0, Width, Height); 39 //向矩形框内填充Img 40 Grp.DrawImage(Img, 0, 0, Rec, GraphicsUnit.Pixel); 41 42 43 //平移Graphics对象 44 Grp.TranslateTransform(Width - RightMargin, UpMargin); 45 //设置Graphics对象的输出角度以改变文字方向 46 Grp.RotateTransform(180); 47 //设置文字填充颜色 48 Brush brush = Brushes.Black; 49 //旋转显示文字 50 Grp.DrawString(WriteString, new Font(FontType, FontSize, GraphicsUnit.Pixel), brush, 0, 0); 51 //恢复全局变换矩阵 52 Grp.ResetTransform(); 53 Grp.Dispose(); 54 GC.Collect(); 55 return BitmapResult; 56 }
