itext - 2D barcode generation issue in Java -

i generating barcodes using itext api, looks when linear barcodes when 2d barcodes barcodes placed pdf document images, hence reducing quality of barcode on low resolution printers , unable scan barcode. below code

barcodepdf417 pdf417 = new barcodepdf417();     string text = "barcodepdf417 barcode";     pdf417.settext(text);     image img = pdf417.getimage();             document.add(img); 

now alternative draw barcode , found palcebarcode method might favor requirement.

i have seen below code in barcodepdf417 class in itext source , not able find out way how use it

public void placebarcode(pdfcontentbyte cb, basecolor foreground, float moduleheight, float modulewidth) {     paintcode();     int stride = (bitcolumns + 7) / 8;     cb.setcolorfill(foreground);     (int k = 0; k < coderows; ++k) {         int p = k * stride;         (int j = 0; j < bitcolumns; ++j) {             int b = outbits[p + j / 8] & 0xff;             b <<= j % 8;             if ((b & 0x80) != 0) {                 cb.rectangle(j * modulewidth, (coderows - k - 1) * moduleheight, modulewidth, moduleheight);             }         }     }     cb.fill(); } 

can suggest way use above method?

i have written code below getting dark page whole.

rectangle pagesize = new rectangle(w * 72, h * 72);     document doc = new document(pagesize, 1f, 1f, 1f, 1f);     pdfwriter writer = pdfwriter.getinstance(doc, getoutputstream());     doc.open();     pdfcontentbyte cb = writer.getdirectcontent();     barcodepdf417 pf = new barcodepdf417();     pf.settext("barcodepdf417 barcode");     pf.getimage();     rectangle rc = pf.getbarcodesize();     pf.placebarcode(cb, basecolor.black, rc.getheight(), rc.getwidth());     doc.close(); 

please take @ barcodeplacement example. in example, create 3 pdf417 barcodes:

pdfcontentbyte cb = writer.getdirectcontent(); image img = createbarcode(cb, "this 2d barcode", 1, 1); document.add(new paragraph(     string.format("this barcode measures %s %s user units",        img.getscaledwidth(), img.getscaledheight()))); document.add(img); img = createbarcode(cb, "this not raster image", 3, 3); document.add(new paragraph(     string.format("this barcode measures %s %s user units",         img.getscaledwidth(), img.getscaledheight()))); document.add(img); img = createbarcode(cb, "this vector data drawn on pdf page", 1, 3); document.add(new paragraph(     string.format("this barcode measures %s %s user units",         img.getscaledwidth(), img.getscaledheight()))); 

the result looks on outside:

one particular barcode looks on inside:

i'm adding inside view show 2d barcode not added raster image (as case initial approach you've tried). vector image consisting of series of small rectangles. can check taking @ barcode_placement.pdf file.

please don't confused because use image object. if @ createbarcode() method, can see image is, in fact, vector image:

public image createbarcode(pdfcontentbyte cb, string text,     float mh, float mw) throws badelementexception {     barcodepdf417 pf = new barcodepdf417();     pf.settext("barcodepdf417 barcode");     rectangle size = pf.getbarcodesize();     pdftemplate template = cb.createtemplate(         mw * size.getwidth(), mh * size.getheight());     pf.placebarcode(template, basecolor.black, mh, mw);     return image.getinstance(template); } 

the height , width passed placebarcode() method, define height , width of small rectangles drawn. if @ inside view, can see instance:

0 21 3 1 re 

this rectangle x = 0, y = 21, width 3 , height 1.

when ask barcode size, number of rectangles drawn. hence dimensions of barcode is:

rectangle size = pf.getbarcodesize(); float width = mw * size.getwidth(); float height = mh * size.getheight(); 

your assumption size size in user units correct if mw , mh equal 1.

i use these values create pdftemplate instance , draw barcode form xobject. of times, it's easier work image class working pdftemplate, wrap pdftemplate inside image.

i can add image document other image. main difference ordinary images, image vector image.