java - JGraphX 图中边不可见

Question

我正在研究 JGraphX。我使用 graphComponent 的 insertEdge 方法在两个顶点之间添加了一条边。但边缘不可见。如果我保存，然后关闭，然后打开同一个文件，我可以看到边缘。为什么我添加后看不到？

如果我为同一单元格创建一条边，即 graph.insertEdge(parent,null, "hasEntity", newCell, newCell)，那么它会将边添加到自身，即源顶点和目标顶点相同。我不需要在这里关闭和打开图表。

mxCell defaultActivityEdge = (mxCell) graph.insertEdge(parentObject, null, "hasActivity", cell3, newCell); 
graph.addCell(defaultActivityEdge); 
defaultActivityEdge.setVisible(true);
graph.clearSelection(); 
graph.refresh()

Answer 1

您不需要将 insertEdge() 的返回对象作为单元格添加到图形中。请查看下面的示例并在您的代码中更正相同的内容。

public class MxGraphSample {

    public static void creategraph() {

        final JFrame frame = new JFrame();
        frame.setSize(300, 300);
        JPanel panel = new JPanel();
        panel.setSize(frame.getMaximumSize().width,
                frame.getMaximumSize().height);

        final mxGraph graph = new mxGraph();
        Object parent = graph.getDefaultParent();
        graph.getModel().beginUpdate();

        try {
            Object v1 = graph.insertVertex(parent, null, "v1", 20, 20, 80, 30);
            Object v2 = graph.insertVertex(parent, null, "v2", 120, 70, 80, 30);
            Object v3 = graph.insertVertex(parent, null, "v3", 220, 70, 80, 30,
                    "fillColor=lightgreen");

            graph.insertEdge(parent, null, "", v1, v2);
            graph.insertEdge(parent, null, "", v1, v3, "strokeColor=lightgreen");

            graph.cellsFolded(new Object[] {v1, v2, v3}, true, true);

            mxCompactTreeLayout layout = new mxCompactTreeLayout(graph);
            layout.setLevelDistance(40);
            layout.setNodeDistance(30);
            layout.setEdgeRouting(false);
            layout.setUseBoundingBox(false);
            layout.execute(graph.getDefaultParent());

        } finally {
            graph.getModel().endUpdate();
        }
        final mxGraphComponent graphComponent = new mxGraphComponent(graph);

        graphComponent.setFoldingEnabled(true);

        panel.setLayout(new BorderLayout());
        panel.add(graphComponent, BorderLayout.CENTER);

        frame.add(panel);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        creategraph();
    }
}

输出