setCheckMethod(checkMethod) {
		//  We can improve this check,
		//  because now you can use every method in theory
		if (typeof this.getBounds()[this.checkMethod] === "function") {
			this.checkMethod = checkMethod;
		}
	}
Sets the collision method which is going to be used to check a valid drop
@param {string} checkMethod - the checkmethod (defaults to CHECKMETHOD_OVERLAP)