How to add PageContent text gravity ?

PageContent content = new PageContent(); content.Create(); content.GSSave(); Matrix mat = new Matrix(1, 1,10, 730); content.GSSetMatrix(mat); mat.Destroy(); DocFont dfont = m_doc.NewFontCID("Helvetica Bold", 1); ResFont rfont = page.AddResFont(dfont); content.TextBegin(); content.TextSetFont(rfont, 25);// set font and content.TextSetCharSpace(1f); content.TextSetWordSpace(0.2f); content.TextSetLeading(16); content.TextSetRenderMode(0); //SpannableString content11 = new SpannableString(Txt_roomate); //content11.setSpan(new UnderlineSpan(), 0, content11.length(), 0); content.DrawText("Centered and Underlined Text"); content.SetFillColor(Color.parseColor(Global.pdf_general_text_color)); content.SetStrokeColor(Color.parseColor(Global.pdf_general_text_color)); content.TextEnd(); content.GSRestore(); page.AddContent(content, true); content.Destroy();

Page page = m_doc.NewPage(pageno, w, h);//create A4 paper PageContent content = new PageContent(); content.Create();//create content, do not forget. //set alpha for both fill and stroke DocGState dgs = m_doc.NewGState(); dgs.SetFillAlpha(255);//set alpha value to 0.5 dgs.SetStrokeAlpha(255);//set alpha value to 0.5 ResGState rgs = page.AddResGState(dgs); content.GSSet(rgs); //prepare to write texts content.GSSave(); int style = 1; DocFont dfont = m_doc.NewFontCID("DroidSansFallback", style);//bold-italic and embed in horizontal writing if(dfont == null) { dfont = m_doc.NewFontCID("Roboto-Regular", style); if(dfont == null) dfont = m_doc.NewFontCID("DroidSans", style); } ResFont rfont = page.AddResFont(dfont); //center text String text = "Pink text!"; float[] size = content.TextGetSize(rfont, text, 22, 22,0, 0.2f); content.GSSave(); Matrix mat = new Matrix( 1, 1, (w-size[0])/2, 777 ); content.GSSetMatrix(mat); mat.Destroy(); content.TextBegin(); content.TextSetFont(rfont, 22);//set font and size content.SetFillColor(0xff69b4);//set fill color to black-green. content.TextSetCharSpace(0); content.TextSetWordSpace(0.2f); /*content.TextSetLeading(16); content.TextSetRenderMode(0);//fill and stroke content.TextSetHScale(120);//set horizontal scale*/ content.DrawText(text); content.TextEnd(); content.GSRestore(); //underline dgs = m_doc.NewGState(); dgs.SetFillAlpha(255);//set alpha value to 0.5 dgs.SetStrokeAlpha(255);//set alpha value to 0.5 rgs = page.AddResGState(dgs); content.GSSet(rgs); content.GSSave(); Matrix matUnder = new Matrix( 1, 1, (w-size[0])/2, 770 ); content.GSSetMatrix(matUnder); matUnder.Destroy(); //build a path object Path pathUnder = new Path(); pathUnder.MoveTo(1, 1); pathUnder.LineTo(size[0] - 1, 1); pathUnder.ClosePath(); //fill it content.SetStrokeColor(0xff69b4);//set pink color; content.SetStrokeWidth(2);//set stroke width content.StrokePath(pathUnder); content.GSRestore(); //add content to page page.AddContent(content, true); content.Destroy(); page.Close();