code: public int getColumnWidth(){
  		int usableWidth = page.getWidth()-getLeftMargin()-getRightMargin()-((getColumnsPerPage()-1)*getColumnSpace());
  		return usableWidth / getColumnsPerPage();
  	}
docs: Gives the printableWidth between the page margins that also considers the </br>
  number of columns per page and the space between them.</br>
  @return int