Graphviz压缩图

我正在用graphviz和它提供的

circo

工具生成一个图形

生成的图形是一个很好的形状，但是节点之间的边的长度比需要的大得多，这使得节点的文本很小（相对于输出图像），因此很难读取

如何使输出图像中的节点更大（相对），以便节点内的文本更易于阅读

输出图像：

源图形文件：

digraph G {
    FoundUrlToFollow [shape=box];
    "Fetch the URL" [shape=circle];
    FoundUrlToFollow -> "Fetch the URL";
    ResponseReceived [shape=box];
    "Fetch the URL" [shape=circle, label=<Fetch the URL>];
    "Fetch the URL" -> ResponseReceived;
    ResponseError [shape=box];
    "Fetch the URL" [shape=circle, label=<Fetch the URL>];
    "Fetch the URL" -> ResponseError;
    ResponseReceived [shape=box];
    "Log response" [shape=circle];
    ResponseReceived -> "Log response";
    ResponseReceived [shape=box];
    "Is the response OK?" [shape=circle];
    ResponseReceived -> "Is the response OK?";
    ResponseOk [shape=box];
    "Is the response OK?" [shape=circle, label=<Is the response<br/>OK?>];
    "Is the response OK?" -> ResponseOk;
    ResponseOk [shape=box];
    "Is the response HTML?" [shape=circle];
    ResponseOk -> "Is the response HTML?";
    HtmlToParse [shape=box];
    "Is the response HTML?" [shape=circle, label=<Is the response<br/>HTML?>];
    "Is the response HTML?" -> HtmlToParse;
    HtmlToParse [shape=box];
    "Parse the HTML to find links" [shape=circle];
    HtmlToParse -> "Parse the HTML to find links";
    FoundUrl [shape=box];
    "Parse the HTML to find links" [shape=circle, label=<Parse the HTML<br/>to find links>];
    "Parse the HTML to find links" -> FoundUrl;
    FoundUrl [shape=box];
    "Should we follow this URL?" [shape=circle];
    FoundUrl -> "Should we follow this URL?";
    FoundUrlToSkip [shape=box];
    "Should we follow this URL?" [shape=circle, label=<Should we<br/>follow this<br/>URL?>];
    "Should we follow this URL?" -> FoundUrlToSkip;
    FoundUrlToFollow [shape=box];
    "Should we follow this URL?" [shape=circle, label=<Should we<br/>follow this<br/>URL?>];
    "Should we follow this URL?" -> FoundUrlToFollow;
    FoundUrlToSkip [shape=box];
    "Log skipped links" [shape=circle];
    FoundUrlToSkip -> "Log skipped links";
    graph [label="Switches are circles. Events are boxes.", fontsize="12", overlap=scale];
    edge [splines=curved];
}

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我会尝试在图表中添加mindist（小于1）：

graph [..., overlap=scale, mindist=.6];

[编辑]

也许渲染器版本会有所不同：下面是我的机器上的结果

---

尝试改变

-Gsize

（英寸单位）和

-Gdpi

。您会发现，如果同时更改它们，您将获得具有相同像素大小的不同输出，但节点之间的间距相对于节点本身的大小不同

-Gnodesep

和

-Nfontsize

也可能有助于调整。通过将其渲染为EPS、PDF或SVG，然后将其转换为PNG，而不是使用Graphviz的PNG渲染器，您可能会有更好的运气。根据我的经验，从Graphviz获得令人满意的输出是一门非常不精确的科学。

这似乎没有多大区别——不同的一点是，我显然没有在libexpat中编译，因此HTML是在一行上呈现的。这与fontsize的结合似乎对定位有很大的改变。你说得对。可能会根据节点按比例缩放边。一般来说，我正在从Graphviz（在我花了时间之后）切换到OGDF，因为根据需要“混合”布局并不容易。。。

graph [..., overlap=scale, mindist=.6];