def EuclideanHeuristic(start_node, goal_node):
    """
    Function to calculate the Euclidean Distance
    :param start_node: start node
    :type start_node: Node
    :param goal_node: Goal Node
    :type goal_node: Node
    :return: Euclidean distance units
    :rtype: Integer
    """
    x_1 = start_node.x
    y_1 = start_node.y

    x_2 = goal_node.x
    y_2 = goal_node.y

    euc_distance = ((x_2 - x_1) ** 2 + (y_2 - y_1) ** 2) ** 0.5

    return euc_distance