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我使用以下代码创建了此图表.但是正如你所看到的,从(取消订单)和(下订单)到(发布者)的线路决定采用一条非常圆润的路径来获取它们,而不是直接向右转,然后向下发布.我尝试使用手动方向命令,如"-down",但它们似乎都没有帮助.有人知道如何解决这个问题吗？

这是我的代码.我感谢任何帮助.谢谢.

@startUML EBook Use Case Diagram
left to right direction
Actor Customer as customer
Actor EBook as ebook
Actor Publisher as publisher
rectangle "Book Catalogue" {
    together {
        Actor "Book Database" as bookLog
        (Retrieve Information) as getBook
        customer -- getBook
        getBook -- ebook
        getBook -- bookLog

        (Update Catalogue) as updateCatalogue
        ebook -- updateCatalogue
        updateCatalogue -- bookLog
    }

    together {
        (Place Order) as order
        customer -- order
        order -- ebook
        order--publisher

        (Cancel Order) as cancelOrder
        customer -- cancelOrder
        cancelOrder -- …