code: public void clear () {
  		minWidth = null;
  		minHeight = null;
  		prefWidth = null;
  		prefHeight = null;
  		maxWidth = null;
  		maxHeight = null;
  		spaceTop = null;
  		spaceLeft = null;
  		spaceBottom = null;
  		spaceRight = null;
  		padTop = null;
  		padLeft = null;
  		padBottom = null;
  		padRight = null;
  		fillX = null;
  		fillY = null;
  		align = null;
  		expandX = null;
  		expandY = null;
  		ignore = null;
  		colspan = null;
  		uniformX = null;
  		uniformY = null;
  	}
docs: Sets all constraint fields to null.