如何在JUNG中添加具有相同标签（但不同端点）的两条边？ [英] How to add two edges having the same label (but different endpoints) in JUNG?

问题描述

如何添加具有相同标签但不同端点的两条边？

How to add two edges having the same label but different endpoints?

例如，我想添加两条具有相同标签'label1'的边，一条来自顶点v-1到顶点v-2，另一个从顶点v-2到v-3。

For example, I want to add two edges having the same label 'label1', one from vertex v-1 to vertex v-2 and the other one from vertex v-2 to v-3.

部分代码是：

g.addEdge("label1","v-1","v-2");
g.addEdge("label1","v-2","v-3");

但是JUNG不允许添加具有相同标签的两条边。它给出了一个错误：

But JUNG does not allow to add two edges with the same label. It gives an error:

此图表中已存在边缘标签1，端点为[v-1，v-2]且不能为
添加端点[v-2，v-3]

edge label1 already exists in this graph with endpoints [v-1, v-2] and cannot be added with endpoints [v-2, v-3]

如何添加具有相同标签的两条边？

How can I add two edges having the same label?

谢谢。

我刚读过有一种方法可以为边缘分配权重值，即使用 EdgeWeightLabeller ，但这些权重值应该是整数。所以它似乎没有解决问题。

I just read that there is a way to assign a weight value to an edge, that is by using EdgeWeightLabeller, but these weight values should be integers. So it does not seem to solve the problem.

推荐答案

当我遇到这个问题时，我制作了我的标签字符串（你已经是一个字符串）并使其值如下： ID_OF_FIRST_VERTEX：ID_OF_SECOND_VERTEX：EDGE_VALUE。然后，为了显示一个值，我确实使用转换。它很简单，只需要从边缘名称获取edge_value。

When I have this problem, I make my label String (your is already a String) and make its value like this: "ID_OF_FIRST_VERTEX:ID_OF_SECOND_VERTEX:EDGE_VALUE". Then, to display just a value, I do use transformation. Its simple, it just takes the edge_value from name of edge.

在此示例中，我使用了分隔符：。

In this sample I use a separator ":".

VisualizationViewer vv = new VisualizationViewer(layout, dim);
//other operations
vv.getRenderContext().setEdgeLabelTransformer(new Transformer<String, String>() {
    @Override
    public String transform(String c) {
        return StringUtils.substringAfterLast(c, ":");
    }
});

当然你不必使用Apache Commons的StringUtils，普通的String.subString在这里可以用作好吧。

Of course you dont have to use StringUtils from Apache Commons, a normal String.subString will work here as well.

希望有所帮助。

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