public class MyGDI {     public static void CreateWatermark(string sSrcFilePath, string sDstFilePath, string sText1, string sColor1, string sSize1, string sFont1, string sText2, string sColor2, string sSize2, string sFont2, string sBgColor, string sTransparence)     {         System.Drawing.Image image = System.Drawing.Image.FromFile(sSrcFilePath);         Graphics g = Graphics.FromImage(image);         g.SmoothingMode = SmoothingMode.AntiAlias;         g.InterpolationMode = InterpolationMode.HighQualityBicubic;         g.CompositingQuality = CompositingQuality.HighQuality;         g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; //文字抗锯齿         g.DrawImage(image, 0, 0, image.Width, image.Height);         Font f1 = new Font(sFont1, float.Parse(sSize1));         Font f2 = new Font(sFont2, float.Parse(sSize2));         Brush brushfortext1 = new SolidBrush(ColorTranslator.FromHtml(sColor1));         Brush brushfortext2 = new SolidBrush(ColorTranslator.FromHtml(sColor2));         Brush brushforbg = new SolidBrush(Color.FromArgb(Convert.ToInt16(255 * float.Parse(sTransparence)), ColorTranslator.FromHtml(sBgColor)));         g.RotateTransform(-20);         Rectangle rect = new Rectangle(-image.Width/2-50, image.Height - 50, image.Width * 2, 40);         g.DrawRectangle(new Pen(brushforbg), rect);         g.FillRectangle(brushforbg, rect);         Rectangle rectfortext1 = new Rectangle(-image.Width/2 + image.Width / 5, image.Height - 45, image.Width * 2, 60);         for (int i = 0; i < 10; i++)             g.DrawString(sText1, f1, brushfortext1, rectfortext1);         Rectangle rectfortext2 = new Rectangle(-image.Width / 2 + image.Width / 5, image.Height -25, image.Width * 2, 60);         for (int i = 0; i < 10; i++)             g.DrawString(sText2, f2, brushfortext2, rectfortext2);         image.Save(sDstFilePath, ImageFormat.Jpeg);         image.Dispose();     }     public static void CreateRoundedCorner(string sSrcFilePath, string sDstFilePath, string sCornerLocation)     {         System.Drawing.Image image = System.Drawing.Image.FromFile(sSrcFilePath);         Graphics g = Graphics.FromImage(image);         g.SmoothingMode = SmoothingMode.HighQuality;         g.InterpolationMode = InterpolationMode.HighQualityBicubic;         g.CompositingQuality = CompositingQuality.HighQuality;         Rectangle rect = new Rectangle(0, 0, image.Width, image.Height);         GraphicsPath rectPath = CreateRoundRectanglePath(rect, image.Width / 10, sCornerLocation); //构建圆角外部路径         Brush b = new SolidBrush(Color.White);//圆角背景白色         g.DrawPath(new Pen(b), rectPath);         g.FillPath(b, rectPath);         g.Dispose();         image.Save(sDstFilePath, ImageFormat.Jpeg);         image.Dispose();     }     public static void CreatePlainText(string sSrcFilePath, string sDstFilePath,string sText, string sColor, string sSize, string sFont)     {         System.Drawing.Image image = System.Drawing.Image.FromFile(sSrcFilePath);         Graphics g = Graphics.FromImage(image);         g.SmoothingMode = SmoothingMode.AntiAlias;         g.InterpolationMode = InterpolationMode.HighQualityBicubic;         g.CompositingQuality = CompositingQuality.HighQuality;         g.DrawImage(image, 0, 0, image.Width, image.Height);         g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; //文字抗锯齿         Font f = new Font(sFont,float.Parse(sSize));         Brush b = new SolidBrush(ColorTranslator.FromHtml(sColor));         Rectangle rect = new Rectangle(10, 5, image.Width, image.Height); //适当空开一段距离                 for (int i = 0; i < 30; i++) //加强亮度             g.DrawString(sText, f, b, rect);         image.Save(sDstFilePath, ImageFormat.Jpeg);         image.Dispose();     }     private static GraphicsPath CreateRoundRectanglePath(Rectangle rect, int radius, string sPosition)     {         GraphicsPath rectPath = new GraphicsPath();         switch (sPosition)         {             case "TopLeft":                 {                     rectPath.AddArc(rect.Left, rect.Top, radius * 2, radius * 2, 180, 90);                     rectPath.AddLine(rect.Left, rect.Top, rect.Left, rect.Top + radius);                     break;                 }             case "TopRight":                 {                     rectPath.AddArc(rect.Right - radius * 2, rect.Top, radius * 2, radius * 2, 270, 90);                     rectPath.AddLine(rect.Right, rect.Top, rect.Right - radius, rect.Top);                     break;                 }             case "BottomLeft":                 {                     rectPath.AddArc(rect.Left, rect.Bottom - radius * 2, radius * 2, radius * 2, 90, 90);                     rectPath.AddLine(rect.Left, rect.Bottom - radius, rect.Left, rect.Bottom);                     break;                 }             case "BottomRight":                 {                     rectPath.AddArc(rect.Right - radius * 2, rect.Bottom - radius * 2, radius * 2, radius * 2, 0, 90);                     rectPath.AddLine(rect.Right - radius, rect.Bottom, rect.Right, rect.Bottom);                     break;                 }         }         return rectPath;     } }