code: public void setTextMatrix(float a, float b, float c, float d, float x, float y) {
          state.xTLM = x;
          state.yTLM = y;
          content.append(a).append(' ').append(b).append_i(' ')
          .append(c).append_i(' ').append(d).append_i(' ')
          .append(x).append_i(' ').append(y).append(" Tm").append_i(separator);
      }
docs: Changes the text matrix.
  <P>
  Remark: this operation also initializes the current point position.</P>
  
  @param       a           operand 1,1 in the matrix
  @param       b           operand 1,2 in the matrix
  @param       c           operand 2,1 in the matrix
  @param       d           operand 2,2 in the matrix
  @param       x           operand 3,1 in the matrix
  @param       y           operand 3,2 in the matrix