[英]How to add two edges having the same label (but different endpoints) in JUNG?
How to add two edges having the same label but different endpoints? 如何添加具有相同标签但不同端点的两条边?
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. 例如,我想添加两个具有相同标签'label1'的边,一个从顶点v-1到顶点v-2,另一个从顶点v-2到v-3。
Part of the code would be: 部分代码是:
g.addEdge("label1","v-1","v-2");
g.addEdge("label1","v-2","v-3");
But JUNG does not allow to add two edges with the same label. 但是JUNG不允许添加具有相同标签的两条边。 It gives an error:
它给出了一个错误:
edge label1 already exists in this graph with endpoints [v-1, v-2] and cannot be added with endpoints [v-2, v-3]
edge label1已存在于此图中,端点为[v-1,v-2],无法添加端点[v-2,v-3]
How can I add two edges having the same label? 如何添加具有相同标签的两条边?
Thanks. 谢谢。
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. 我刚刚读到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。 So it does not seem to solve the problem.
所以它似乎没有解决问题。
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". 当我遇到这个问题时,我创建了我的标签字符串(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”。 Then, to display just a value, I do use transformation.
然后,为了只显示一个值,我确实使用了转换。 Its simple, it just takes the edge_value from name of edge.
它很简单,它只是从edge的名字中获取edge_value。
In this sample I use a separator ":". 在此示例中,我使用了分隔符“:”。
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, ":");
}
});
Of course you dont have to use StringUtils from Apache Commons, a normal String.subString will work here as well. 当然你不必使用Apache Commons的StringUtils,普通的String.subString也适用于此。
Hope it helps. 希望能帮助到你。
Labels are not required to be the toString() of the edges; 标签不需要是边的toString(); that's just the default.
这只是默认值。 Take a look at PluggableRendererContext to see how to supply a Transformer that provides a property for each element of the graph.
查看PluggableRendererContext,了解如何提供为图的每个元素提供属性的Transformer。
I'd also check out the section in the JUNG 2 manual (on the wiki) that talks about user data: http://sourceforge.net/apps/trac/jung/wiki/JUNGManual#UserData 我还要查看JUNG 2手册(维基上)中有关用户数据的部分: http : //sourceforge.net/apps/trac/jung/wiki/JUNGManual#UserData
Here is an MCVE example. 这是一个MCVE示例。
package stackoverflow;
import javax.swing.JFrame;
import org.apache.commons.collections15.Transformer;
import edu.uci.ics.jung.algorithms.layout.FRLayout;
import edu.uci.ics.jung.graph.DirectedSparseMultigraph;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.visualization.VisualizationViewer;
public class JungNetwork {
public static Graph<String, String> getGraph()
{
Graph<String, String> g = new DirectedSparseMultigraph<String, String>();
g.addVertex("v1");
g.addVertex("v2");
g.addVertex("v3");
g.addEdge("label1", "v1", "v2");
g.addEdge("label2", "v2", "v3");
g.addEdge("label3", "v3", "v1");
return g;
}
public static void main(String[] args)
{
JFrame f = new JFrame();
final Graph<String, String> g = getGraph();
VisualizationViewer<String, String> vv = new VisualizationViewer<String, String>(new FRLayout<String, String>(g));
final Transformer <String, String> edgeLabel = new Transformer<String, String>(){
@Override
public String transform(String edge) {
// TODO Auto-generated method stub
if (edge.equals("label1")|| edge.equals("label2")){
return "label1";
}else
return "label3";
}
};
vv.getRenderContext().setLabelOffset(15);
vv.getRenderContext().setEdgeLabelTransformer(edgeLabel);
f.getContentPane().add(vv);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setVisible(true);
}
}
The Result: 结果:
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