Method addBracketable

src/main/java/fieldbox/boxes/Drawing.java:487–491

(Bracketable bracketable)

	}

	public DrawingInterface addBracketable(Bracketable bracketable) {
		bracketableList.add(bracketable);
		if (isInsideDrawing()) bracketable.open();
		return this;
	}

	/**
	 * to convert between event / mouse / pixel coordinates and OpenGL / Box / Drawing coordinates.