iTextSharp.text.pdf.PdfContentByte.ConcatCTM C# (CSharp) Метод

        public void ConcatCTM(float a, float b, float c, float d, float e, float f)
        {
            if (inText && autoControlTextBlocks) {
                EndText();
            }
            content.Append(a).Append(' ').Append(b).Append(' ').Append(c).Append(' ');
            content.Append(d).Append(' ').Append(e).Append(' ').Append(f).Append(" cm").Append_i(separator);
        }

 /** Shows a line of text. Only the first line is written.
  * @param canvas where the text is to be written to
  * @param alignment the alignment. It is not influenced by the run direction
  * @param phrase the <CODE>Phrase</CODE> with the text
  * @param x the x reference position
  * @param y the y reference position
  * @param rotation the rotation to be applied in degrees counterclockwise
  * @param runDirection the run direction
  * @param arabicOptions the options for the arabic shaping
  */    
 public static void ShowTextAligned(PdfContentByte canvas, int alignment, Phrase phrase, float x, float y, float rotation, int runDirection, int arabicOptions) {
     if (alignment != Element.ALIGN_LEFT && alignment != Element.ALIGN_CENTER
         && alignment != Element.ALIGN_RIGHT)
         alignment = Element.ALIGN_LEFT;
     canvas.SaveState();
     ColumnText ct = new ColumnText(canvas);
     float lly = -1;
     float ury = 2;
     float llx;
     float urx;
     switch (alignment) {
         case Element.ALIGN_LEFT:
             llx = 0;
             urx = 20000;
             break;
         case Element.ALIGN_RIGHT:
             llx = -20000;
             urx = 0;
             break;
         default:
             llx = -20000;
             urx = 20000;
             break;
     }
     if (rotation == 0) {
         llx += x;
         lly += y;
         urx += x;
         ury += y;
     }
     else {
         double alpha = rotation * Math.PI / 180.0;
         float cos = (float)Math.Cos(alpha);
         float sin = (float)Math.Sin(alpha);
         canvas.ConcatCTM(cos, sin, -sin, cos, x, y);
     }
     ct.SetSimpleColumn(phrase, llx, lly, urx, ury, 2, alignment);
     if (runDirection == PdfWriter.RUN_DIRECTION_RTL) {
         if (alignment == Element.ALIGN_LEFT)
             alignment = Element.ALIGN_RIGHT;
         else if (alignment == Element.ALIGN_RIGHT)
             alignment = Element.ALIGN_LEFT;
     }
     ct.Alignment = alignment;
     ct.ArabicOptions = arabicOptions;
     ct.RunDirection = runDirection;
     ct.Go();
     canvas.RestoreState();
 }