我正在尝试为我正在编写的工具生成类图，但是我似乎无法正确布局。
这是我从真实数据生成的示例点文件：
digraph G {
fontname = "Bitstream Vera Sans"
fontsize = 8
splines = "ortho"
node [
fontname = "Bitstream Vera Sans"
fontsize = 8
shape = "record"
]
edge[
arrowtail="empty"
dir="back"
]
Baseclass [
label = "{xxxxxxxxxx::Baseclass||+ xxxxxxxxxxx \l+ xxxxxxx \l+ xxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l}"
]
SubclassOne [
label = "{xxxxxxxxxx::SubclassOne||+ xxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxx \l+ xxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxx \l}"
]
SubclassTwo [
label = "{xxxxxxxxxx::SubclassTwo||+ xxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxxxxxxxxx \l}"
]
SubclassThree [
label = "{xxxxxxxxxx::SubclassThree||+ xxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxxxx \l}"
]
SubclassFour [
label = "{xxxxxxxxxx::SubclassFour||+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxx \l- xxxxxxxxxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxx \l}"
]
SubclassFive [
label = "{xxxxxxxxxx::SubclassFive||+ xxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxx \l+ xxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxxxxxxxxx \l+ xxxxxxxxxxx \l+ xxxxxxxx \l+ xxxxxxxxxxxxxxx \l- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx \l}"
]
Baseclass:s -> SubclassOne:n;
Baseclass:s -> SubclassTwo:n;
Baseclass:s -> SubclassThree:n;
Baseclass:s -> SubclassFour:n;
Baseclass:s -> SubclassFive:n;
}
它使用graphviz生成以下图像：
I changed the order of the edge relationships to point from the base to the subclass (with a tail arrow) so that the subclass would be ordered higher vertically than the base classes. Long method names are overflowing their containers, and the relationship edges aren't obeying the specified ports on the tail end. It looks like their X position is correct, but the y possition is not. I'd prefer it to look something like this where both the subclass relationship arrows are combined to form a single connection with the bottom center point in the superclass container. If I remove the port specifications, the edges no longer clip into the nodes they connect, but the layout is still not what I'd consider ideal.
