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名片设计 CorelDRAW Illustrator AuotoCAD Painter 其他软件 Photoshop Fireworks Flash |
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Graphics的DrawImage方式，定义了多种原型，可以在制定位置绘制指定Image对象。利用此方式可以在图片对象上再绘制一个水印图片。结合FreeTextBox方便的图片上传功能，可以实现一个适合图片新闻较多的新闻系统。以下WaterMark方式所带参数为文件流，原始图片名称，水印图片名称，图片保存路径等，对应注释理解代码应该没有多大问题。 ----------------------------------------------------------------- public void WaterMark(Stream inputStream, string fileName, string markName, string picPath) { string WorkingDirectory = HttpContext.Current.Request.PhysicalApplicationPath + "\\" + picPath; Stream PhotoStream = inputStream; string WatermarkName = markName; string PhotoFinalName = fileName; //create a image object containing the photograph to watermark System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(PhotoStream); int phWidth = imgPhoto.Width; int phHeight = imgPhoto.Height; //create a image object containing the watermark System.Drawing.Image imgWatermark = new Bitmap(WorkingDirectory + "\\" + WatermarkName); int wmWidth = imgWatermark.Width; int wmHeight = imgWatermark.Height; //Create a Bitmap Bitmap bmWatermark = new Bitmap(PhotoStream); bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); //Load this Bitmap into a new Graphic Object Graphics grWatermark = Graphics.FromImage(bmWatermark); ImageAttributes imageAttributes = new ImageAttributes(); //This color manipulation is used to change the opacity of the //watermark. This is done by applying a 5x5 matrix that contains the //coordinates for the RGBA space. By setting the 3rd row and 3rd column //to 0.3f we achive a level of opacity float[][] colorMatrixElements = { new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.3f, 0.0f}, new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}}; ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements); imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap); //For this example we will place the watermark in the upper right //hand corner of the photograph. offset down 10 pixels and to the //left 10 pixles int xPosOfWm = ((phWidth - wmWidth)-10); int yPosOfWm = 10; grWatermark.DrawImage(imgWatermark, new Rectangle(xPosOfWm,yPosOfWm,wmWidth,wmHeight), //Set the detination Position 0, // x-coordinate of the portion of the source image to draw. 0, // y-coordinate of the portion of the source image to draw. wmWidth, // Watermark Width wmHeight, // Watermark Height GraphicsUnit.Pixel, // Unit of measurment imageAttributes); //ImageAttributes Object //Replace the original photgraphs bitmap with the new Bitmap imgPhoto = bmWatermark; grWatermark.Dispose(); //save new image to file system. imgPhoto.Save(WorkingDirectory + "\\" + PhotoFinalName, ImageFormat.Jpeg); imgPhoto.Dispose(); imgWatermark.Dispose(); PhotoStream.Close(); } -------------------------------------------------------------------- FTB的图片上传主要利用HtmlInputFile控件，对应HtmlInputFile类的属性PostedFile，它含有SaveAs方式可以来保存图片。当然我们不希望在图片保存完之后再专门读它建Graphics对象来再次处理，因此查了MSDN，发现PostedFile属性返回的是HttpPostedFile 类的一个实例，而HttpPostedFile 有InputStream对象，通过HtmlInputFile控件上传的文件可以通过该Stream对象获得上传文件流，作为WaterMake的参数实现最终功能。 所以最后只要在FTB中把ftb.imagegallery.aspx文件第77行UploadFile.PostedFile.SaveAs那句注释，并替换为对WaterMake方式的调用就行：WaterMark(UploadFile.PostedFile.InputStream, UploadFileName, "watermark.bmp", "UploadPics");当然还要把WaterMake方式放到代码中。 返回类别: 教程 上一教程: 如何链结到一副图片上 下一教程: 利用FSO取得BMP，JPG，PNG，GIF文件信息(大小，宽、高等) 您可以阅读与"为FREETEXTBOX1.6.5上传图片加上水印"相关的教程: · 无组件上传图片到数据库中，最完整解决方案 · ASP无组件上传图片的基本方式 · 无组件上传图片至SQL SERVER数据库 · 无组件上传图片之文件采用方案 · 轻松实现将上传图片到数据库 |
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