code: public void setPixelPerInch(int pixelPerInch)
  	{
  		if (1 > pixelPerInch)
  		{
  			String _message = "The specified pixelPerInch ({0}) is incorrect, it must be greater or equal than 1.";
  			Object[] _parameters =
  			{
  				new Integer(pixelPerInch)
  			};
  			throw new IllegalArgumentException(MessageFormat.format(_message, _parameters));
  		}
  		myPixelPerInch = pixelPerInch;
  	}
docs: /*
  (non-Javadoc)
  
  @see com.sporniket.libre.ui.swing.paper.SheetOfPaper#setPixelPerInch(int)