Closed richard-kurtosys closed 6 years ago
For first question, Am I creating the transparency object correctly?
I think you miss this part in https://github.com/galkahana/HummusJS/issues/160#issuecomment-300127454
For gsName
, I believe you do it in the correct way, but you attach to page
but not to the document structure.
However, here is one of the solution for your case. I think this will also fix your problem for translate to (0,35). If your watermark is a static string like DEMO
, you can re-use this xObject on each page without creating a new one.
var hummus = require('hummus');
var pdfWriter = hummus.createWriterToModify('./page.pdf', {
modifiedFilePath: './page_modified.pdf'
});
var fontCouri = pdfWriter.getFontForFile('./Arial.ttf');
/* CREATING THE TRANSPARENCY OBJECT? */
var objCxt = pdfWriter.getObjectsContext();
var gsId = objCxt.startNewIndirectObject();
var dict = objCxt.startDictionary()
dict.writeKey("type");
dict.writeNameValue("ExtGState");
// #242: Change from CA to ca
dict.writeKey("ca");
objCxt.writeNumber(0.5);
objCxt.endLine();
objCxt.endDictionary(dict);
/* GETTING THE gsName? */
var page = pdfWriter.createPage(0, 0, 595, 840);
// #242: Use xObjectForm
var xObject = pdfWriter.createFormXObject(0, 0, 595, 840);
var resourcesDict = xObject.getResourcesDictinary(); // This is not a typo =~=
var gsName = resourcesDict.addExtGStateMapping(gsId);
xObject.getContentContext()
.q()
.gs(gsName)
.BT() // Begin Text
.k(0, 0, 1, 0) // Set Color (CMYK, 0-1)
.Tf(fontCouri, 50) // Text font? Font & size?
.Tm(1, 0, 0, 1, 50, 350) // Text Matrix, set to coord 5,20
.Tj('Deparment') // Show text
.Tm(1, 0, 0, 1, 5, 5) // Text Matrix, set to coord 5,5 (to place below previous line)
.Tj('Page Index ' + 0) // More text
.ET() // End Text
.Q();
pdfWriter.endFormXObject(xObject);
var pageModifier = new hummus.PDFPageModifier(pdfWriter, 0);
var xxx = pageModifier.startContext().getContext();
xxx.q()
.cm(1, 0, 0, 1, 0, 35) // Set Current Matrix - scale to 100% (x and y), translate 0,35
// #242 add xobject
.doXObject(xObject)
.Q()
pageModifier.endContext().writePage();
pdfWriter.end();
Thank you very much @chunyenHuang !
This works perfectly. Once I'm done I'll make a PR into the tests.
Transparent text is now supported in hummus-recipe@1.6.7
as well.
recipe
.editPage(i)
.text('WATERMARK', 'center', 'center', {
bold: true,
size: 60,
color: '#0000FF',
align: 'center center',
opacity: 0.3
})
.endPage()
how can I draw a transparent rectangle using HummusJS. I tried adding opacity.
cxt.drawRectangle(x,y,width,height,{type: 'fill',
color: '#eeeeee',
opacity: 0.9});
Am I missing anything?
How do you do this on all the pages?
First, Awesome library, thank you!
I'm trying to get a transparent watermark overlaid on each page of an existing PDF. I have read issue 160 and gone through issue 142 and read the wiki and examples a couple of times but I can't get it working correctly.
I can write text to each page of the pdf but I can't make it transparent. I have a small code test of trying to get just this working:
The 3 questions I have are: Am I creating the
transparency object
correctly? Am I getting thegsName
correctly? Am I using.gs(gsName)
correctly?Thank you for your time and assistance!