iText Watermark position issue
in [Advanced Techniques]
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From: Lumpia on 6 May 2008 15:03 cfSearching, Something appears to be off as it is still not adjusting for 2 different images at different yOffset positions. I'm not getting an error, just a previous pdf merge instead. You stated that this code: <cfset variables.img = javaLoader.create("com.lowagie.text.Image").getInstance( variables.fullPathToImage1 )> <cfset variables.yOffset = variables.yOffset + variables.img.getHeight()> takes into account the size of the first image and readjusts the yOffset accordingly. Essentially, could I not just 2 different yOffsets like so: <cfset variables.xOffset = 160> <cfset variables.yOffset = 20> <cfif len(trim(form.image1)) > <!--- NOTE - these should be absolute paths ---> <cfset insertWatermarkPDF( fullPathToInputFile , fullPathToImage1 , fullPathToOutputFile1 , variables.xOffset , variables.yOffset , 1 )> </cfif> <cfset variables.xOffset = 160> <cfset variables.yOffset = 30> <cfif len(trim(form.image2)) > <!--- NOTE - these should be absolute paths ---> <cfset insertWatermarkPDF( fullPathToOutputFile1 , fullPathToImage2 , fullPathToOutputFile2 , variables.xOffset , variables.yOffset , 1 )> </cfif> Regardless of how I modify the code, it still wants to overlap the images. Correct me if I'm wrong, but it seems like the code within the function (img.setAbsolutePosition(xPos, yPos)) needs to be adjusted to account if there are 2 images. for ( ii = 1; ii LTE totalPages; ii = ii + 1) { ... box = reader.getCropBox( javacast("int", ii) ); // calculate the x and y postions based on the given offsets xPos = box.getLeft() + arguments.xOffset; yPos = box.getTop() - arguments.yOffset - img.getHeight(); img.setAbsolutePosition( xPos, yPos ); .. } I don't know, it just seems like the problem lies somewhere in there, perhaps an if statement or something. I may be completely off, just a thought. Again, your assistance is ALWAYS appreciated. Thanks.
From: -==cfSearching==- on 6 May 2008 17:59
Lumpia wrote: [i]Essentially, could I not just 2 different yOffsets like so:[/i] Yes. It should work as long as the values correctly account for the size of the first image. Using <cfset variables.yOffset = variables.yOffset + variables.img.getHeight()> Just makes it more dynamic. If you ever changed the watermark images, the code would still work without having to change hard coded values. [i]Regardless of how I modify the code, it still wants to overlap the images. Correct me if I'm wrong, but it seems like the code within the function (img.setAbsolutePosition(xPos, yPos)) needs to be adjusted to account if there are 2 images.[/i] Yes, you are right in thinking that. However, it is already taken care of by <cfset variables.yOffset = variables.yOffset + variables.img.getHeight()>. That code adjusts the yOffset, right before the second call, so it takes into account the height of the first watermark. Let us say your first watermark has a height of 40. The result should be the same as if you were to adjusted the positions manually like this: <cfset variables.xOffset = 160> <!--- Draw the first watermark 20pt from the top of the crop box---> <cfset variables.yOffset = 20> <cfset insertWatermarkPDF( ..., variables.xOffset, variables.yOffset, ...)> <cfset variables.xOffset = 160> <!--- Draw the second watermark 60pt from the top of the crop box---> <!--- ie yOffset = 20 + 40 (image height) ---> <cfset variables.yOffset = 60> <cfset insertWatermarkPDF( ..., variables.xOffset, variables.yOffset, ...)> Try the attached example. Download these (2) sample files from the iText site. Save them to the same directory as your CFM script. You could use different files, but this way we know you will get the same results. http://itext.ugent.be/library/com/lowagie/examples/general/copystamp/ChapterSect ion.pdf http://itext.ugent.be/library/com/lowagie/examples/general/copystamp/watermark.j pg Run the example then open the file named "ChapterSectionFinal.pdf". You should see that the second watermark is placed below the first one. FUNCTION <cfscript> // BEGIN WATERMARK SCRIPT // // zindex refers to placing the image over or under the content, default is under // but if your content has a background, it may obscure the watermark function insertWatermarkPDF(pdfFileIn, imageFile, pdfFileOut, xOffset, yOffset, zIndex) { var Local = structNew(); Local.success = true; try { // create a PdfReader to read the input file Local.reader = javaLoader.create("com.lowagie.text.pdf.PdfReader").init( arguments.pdfFileIn ); Local.totalPages = Local.reader.getNumberOfPages(); // create a PdfStamper to generate the output file Local.out = javaLoader.create("java.io.FileOutputStream").init( arguments.pdfFileOut ); Local.stamper = javaLoader.create("com.lowagie.text.pdf.PdfStamper").init( Local.reader, Local.out); // Load the watermark image from the supplied path Local.img = javaLoader.create("com.lowagie.text.Image").getInstance( arguments.imageFile ); for ( Local.ii = 1; Local.ii LTE Local.totalPages; Local.ii = Local.ii + 1) { if ( arguments.zIndex ) { Local.layer = Local.stamper.getOverContent( javaCast("int", Local.ii) ); } else { Local.layer = Local.stamper.getUnderContent( javaCast("int", Local.ii) ); } // get the size of the cropbox Local.box = Local.reader.getCropBox( javacast("int", Local.ii) ); // calculate the x and y postions based on the given offsets Local.xPos = Local.box.getLeft() + arguments.xOffset; Local.yPos = Local.box.getTop() - arguments.yOffset - Local.img.getHeight(); Writeoutput("DEBUGGING ONLY: page["& Local.ii &"] xPos="& Local.xPos &", yPos="& Local.yPos &"<br>"); Local.img.setAbsolutePosition( Local.xPos, Local.yPos ); // draw the watermark image Local.layer.addImage( Local.img ); } // always close the file and outstream Local.stamper.close(); Local.out.close(); Local.success = true; } catch (any e) { if ( structKeyExists(Local, "stamper") ) { Local.stamper.close(); } if ( structKeyExists(Local, "out") ) { Local.out.close(); } // NOTE - you may wish to rethrow the error here instead Local.success = false; } return Local.success; } </cfscript> EXAMPLE <!--- Requires these (2) source files exist in the current directory. http://itext.ugent.be/library/com/lowagie/examples/general/copystamp/ChapterSect ion.pdf http://itext.ugent.be/library/com/lowagie/examples/general/copystamp/watermark.j pg ---> <cfset form.image1 = "watermark"> <cfset form.image2 = "watermark"> <!--- These must be absolute paths ---> <cfset variables.fullPathToImage1 = ExpandPath("./#form.image1#.jpg")> <cfset variables.fullPathToImage2 = ExpandPath("./#form.image2#.jpg")> <cfset variables.fullPathToInputFile = ExpandPath("./ChapterSection.pdf")> <cfset variables.fullPathToOutputFile1 = ExpandPath("./ChapterSectionTemp.pdf")> <cfset variables.fullPathToOutputFile2 = ExpandPath("./ChapterSectionFinal.pdf")> <!--- position the first image 160pt from left and 20pt from the top of cropbox ---> <cfset variables.xOffset = 160> <cfset variables.yOffset = 20> <cfif len(trim(form.image1)) > <cfset insertWatermarkPDF( fullPathToInputFile , fullPathToImage1 , fullPathToOutputFile1 , variables.xOffset , variables.yOffset , 0 )> <!--- to place the second image BELOW the first one, we must add the height of the first image to the yOffset to place it to the RIGHT of the first one, add the width to the xoffset ---> <cfset variables.img = javaLoader.create("com.lowagie.text.Image").getInstance( variables.fullPathToImage1 )> <cfset variables.yOffset = variables.yOffset + variables.img.getHeight()> </cfif> <cfif len(trim(form.image2)) > <cfset insertWatermarkPDF( fullPathToOutputFile1 , fullPathToImage2 , fullPathToOutputFile2 , variables.xOffset , variables.yOffset , 0 )> </cfif> |