【下载文档:  asp.net下GDI＋的一些常用应用（水印，文字，圆角处理）技巧.txt 】

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asp.net下GDI＋的一些常用应用（水印，文字，圆角处理）技巧
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; } }