java - Rotating PDFContentByte Overlay Content -


i have created watermark text vertically centered.

this line used

pdfpatternpainter.showtextalignedkerned(element.align_middle, string, x, y, -90);

what want make watermark diagonal. changing angle value make diagonal, x,y position not centered anymore.

this current method

public static void createwatermarkpdf(arraylist<string> watermark, pdfreader reader, pdfstamper stamper) throws exception {    rectangle pagesize = reader.getpagesize(1);     final float watermark_page_angle = 270;      basefont font = basefont.createfont(basefont.helvetica, basefont.winansi, basefont.not_embedded);      pdfpatternpainter painter = stamper.getovercontent(1).createpattern(pagesize.getwidth(), pagesize.getheight());     painter.setcolorstroke(new basecolor(192, 192, 192));      int font_size = 80;     painter.begintext();     painter.settextrenderingmode(pdfpatternpainter.text_render_mode_fill);     painter.setfontandsize(font, font_size);      (int i=0; i<watermark.size(); i++) {         string string = watermark.get(i);         // values opposite since doing vertical alignment angle         float width = font.getascentpoint(string, font_size) + font.getdescentpoint(string, font_size);         float height = painter.geteffectivestringwidth(string, true);          float x = (pagesize.getwidth() - width) / 2;          if (i == 0)             x += (width * 3);         else if (i == 2)             x -= (width * 3);          painter.showtextalignedkerned(element.align_middle,             string,  x,              util.transformy(pagesize, (pagesize.getheight() - height) / 2),             watermark_page_angle);      }      painter.endtext();      // transparency of watermark     pdfgstate state = new pdfgstate();     state.setfillopacity(0.1f);      (int i=reader.getnumberofpages(); i>0; i--) {         rectangle thispagesize = reader.getpagesize(i);         pdfcontentbyte overcontent = stamper.getovercontent(i);         overcontent.setcolorfill(new patterncolor(painter));         overcontent.setgstate(state);         overcontent.rectangle(thispagesize.getleft(), thispagesize.getbottom(), thispagesize.getwidth(), thispagesize.getheight());         overcontent.fill();     } }

it draws vertical lines , centered. watermark arraylist. can add 3 strings.

if change angle , 300 (or -60) make diagonal, positioning whacked. need use affinetransform here? although tried, didnt work me unless lacked here?


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