JUNG2如何画直线？

Question

用JUNG2测试后，我发现所有的边线都是弯曲的，但不是直线...如何用JUNG2把边线做成直线？

package pkg;

import javax.swing.JFrame;

import edu.uci.ics.jung.algorithms.layout.CircleLayout;
import edu.uci.ics.jung.algorithms.layout.Layout;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.control.DefaultModalGraphMouse;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.graph.SparseMultigraph;
import edu.uci.ics.jung.visualization.control.ModalGraphMouse;

public class test {
    public static void main(String[] args) {
        // Graph<V, E> where V is the type of the vertices
        // and E is the type of the edges
        Graph<Integer, String> g = new SparseMultigraph<Integer, String>();
        // Add some vertices. From above we defined these to be type Integer.
        g.addVertex((Integer)1);
        g.addVertex((Integer)2);
        g.addVertex((Integer)3);
        // Add some edges. From above we defined these to be of type String
        // Note that the default is for undirected edges.
        g.addEdge("Edge-A", 1, 2);
        g.addEdge("Edge-B", 2, 3);
        // Let's see what we have. Note the nice output from the
        // SparseMultigraph<V,E> toString() method
        // Note that we can use the same nodes and edges in two different graphs.
        System.out.println("The graph g = " + g.toString());

        Layout<Integer, String> layout = new CircleLayout(g);

        VisualizationViewer<Integer,String> vv = new VisualizationViewer<Integer,String>(layout);
        DefaultModalGraphMouse gm = new DefaultModalGraphMouse();
        gm.setMode(ModalGraphMouse.Mode.PICKING);
        vv.setGraphMouse(gm);

        JFrame frame = new JFrame("Simple Graph View");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(vv);
        frame.pack();
        frame.setVisible(true);
    }

}

按照输出结果，黑线是默认的，红线是我想要得到的： http://www.zhaocs.info/wp-content/uploads/2015/04/test.png

Answer 1

tl;dr:

通话

vv.getRenderContext().setEdgeShapeTransformer(
    new EdgeShape.Line<Integer,String>());

在你的 VisualizationViewer

JUNG 中的边形有多种选择。这些选项实现为 "edge shape transformers"，嵌套 edu.uci.ics.jung.visualization.decorators.EdgeShape class 的 classes。默认值为 EdgeShape.QuadCurve，这会导致弯曲的边缘。其他选项包括（从文档中提取）：

BentLine<V,E>    bent-line between the vertex endpoints.
Box<V,E>         loop with its nadir at the center of the vertex.
CubicCurve<V,E>  CubicCurve between vertex endpoints.
Line<V,E>        straight line between the vertex endpoints.
Loop<V,E>        loop with its nadir at the center of the vertex.
Orthogonal<V,E>  bent-line between the vertex endpoints.
QuadCurve<V,E>   QuadCurve between vertex endpoints.
SimpleLoop<V,E>  loop with its nadir at the center of the vertex.
Wedge<V,E>       isosceles triangle whose apex is at the destination 
                 vertex for directed edges, and as a "bowtie" shape 
                 for undirected edges.

JUNG2如何画直线？

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