奇怪的graphviz邊緣重疊

Question

我得到一個奇怪的graphviz佈局，邊緣重疊。

節點「5」似乎被放置在錯誤的地方：

如果我強迫與節點「H」節點「5」之間的邊緣和正確的位置，一切都很好地：

爲什麼默認佈局是如此凌亂？

這裏是我的點源（只是取消對該行獲得固定版本）：

digraph dummy { 

    subgraph line1 { rank = same 
     "1", "a", "b", "c", "d", "e", "f", "17" 
    } 

    subgraph line2 { rank = same 
     "9", "g", "11" 
    } 

    subgraph line3 { rank = same 
     "3", "h", "i", "14" 
    } 

    "c" -> "d" 
    "a" -> "b" 
    "b" -> "c" 
    "e" -> "f" 
    "i" -> "14" 
    "14" -> "f" 
    "a" -> "3" 
    "3" -> "h" 
    "d" -> "9" 
    "9" -> "g" 
    "h" -> "i" 
    "g" -> "i" 
    "d" -> "e" 
    "g" -> "11" 
    "11" -> "e" 
    "b" -> "5" 
    #"5" -> "h" # Uncomment to "fix" 
    "c" -> "7" 
    "f" -> "17" 
    "1" -> "a" 
    "h" -> "13" 
    "i" -> "15" 
    "i" -> "15bis" 
    "i" -> "16" 
} 

隨着@Sisyphus的幫助下，我能得到更好的結果（但節點「11」昂「G」沒有理由被切換）：

Answer 1

變化

subgraph line2 { rank = same 
    "9", "g", "11" 
} 

到

{ rank = same 
    rankdir=LR 
    5->7->9->g->11[color=white] 
} 

這個地方的節點「5」正確，但「9」和「g」錯誤。