JUNG布局问题

Question

我有一些图表，我想使用JUNG2显示，如下图所示。

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我尝试过JUNG2的一些布局，但我总是得到这样的图像：

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是否可以在不编写新布局的情况下像我希望的那样布局图形？

提前感谢

Dmitri

更新:这是我用来可视化图形的代码：

private Embedded createSampleGraph() {
Embedded imageComponent = null;

try {
    final DocumentBuilderFactory docBuilderFactory =
            DocumentBuilderFactory
                    .newInstance();
    final DocumentBuilder docBuilder =
            docBuilderFactory.newDocumentBuilder();
    final Document document = docBuilder.newDocument();
    final Element svgelem = document.createElement("svg");
    document.appendChild(svgelem);

    final SVGGraphics2D graphic2d = new SVGGraphics2D(document);

    final Graph<String, String> graph = createGraph();
    final VisualizationImageServer<String, String> server =
            createServer(graph);

    server.printAll(graphic2d);

    final Element el = graphic2d.getRoot();
    el.setAttributeNS(null, "viewBox", "0 0 350 350");
    el.setAttributeNS(null, "style", "width:100%;height:100%;");

    final ByteArrayOutputStream bout = new ByteArrayOutputStream();

    final Writer out = new OutputStreamWriter(bout, "UTF-8");
    graphic2d.stream(el, out);

    final JungResource source = new JungResource(bout);

    TPTApplication.getCurrentApplication().addResource(source);

    imageComponent = new Embedded("", source);

    imageComponent.setWidth(DEFAULT_WIDTH_PIXELS, UNITS_PIXELS);
    imageComponent.setHeight(DEFAULT_HEIGHT_PIXELS, UNITS_PIXELS);
    imageComponent.setMimeType("image/svg+xml");
    addComponent(imageComponent);
} catch (final UnsupportedEncodingException exception) {
    LOGGER.error(ErrorCodes.M_001_UNSUPPORTED_ENCONDING, exception);
} catch (final SVGGraphics2DIOException exception) {
    LOGGER.error(ErrorCodes.M_002_SVG_GRAPHICS_2D_IO, exception);
} catch (final ParserConfigurationException exception) {
    LOGGER.error(ErrorCodes.M_003_PARSER_CONFIGURATION, exception);
}
return imageComponent;
}

private VisualizationImageServer<String, String> createServer(
    final Graph<String, String> aGraph) {
final Layout<String, String> layout = new FRLayout<String, String>(
        aGraph);

layout.setSize(new Dimension(300, 300));
final VisualizationImageServer<String, String> vv =
        new VisualizationImageServer<String, String>(
                layout, new Dimension(350, 350));
vv.getRenderContext().setVertexLabelTransformer(
        new ToStringLabeller<String>());
return vv;
}

private Graph<String, String> createGraph() {
final Graph<String, String> graph =
        new DirectedSparseMultigraph<String, String>();
final String vertex1 = "IE";
final String vertex2 = "P1";
final String vertex3 = "P2";
final String vertex4 = "P3";
final String vertex5 = "FE";

graph.addVertex(vertex1);
graph.addVertex(vertex2);
graph.addVertex(vertex3);
graph.addVertex(vertex4);
graph.addVertex(vertex5);

graph.addEdge("1", vertex1, vertex2, EdgeType.DIRECTED);
graph.addEdge("2", vertex2, vertex3, EdgeType.DIRECTED);
graph.addEdge("3", vertex3, vertex5, EdgeType.DIRECTED);
graph.addEdge("4", vertex1, vertex4, EdgeType.DIRECTED);
graph.addEdge("5", vertex4, vertex5, EdgeType.DIRECTED);
return graph;
}

更新17.03.2011

现在我可以画一张这样的图：

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Answer 1

这与您如何在JUNG中创建顶点和边有关。

首先，我建议您参考JUNG 2.0框架库中jung-samples-2.0.1.jar下的JUNG example WorldMapGraphDemo.class in edu.uci.ics.jung.samples包中的createVertices()和createEdges()方法。

与使用Map对象存储用户定义的顶点和边信息的其他提供的示例相比，这些方法中使用的方法更加清晰。其余部分使用随机生成、库生成或文件生成的信息。

一旦你清楚了这一点，你就可以参考PluggableRendererDemo.class来改进你的图形(就像装饰edu.uci.ics.jung.visualization.decorators和edu.uci.ics.jung.visualization.renderers包下的转换器和渲染器类，用于装饰和渲染顶点、边、方向箭头、形状、大小等)。

Answer 2

Ok...Now我知道你真正想解决的是什么Dmitri，你可以查看另一个JUNG示例，L2RTreeLayoutDemo.class...it看起来非常接近你想要实现的目标。

或者，你可以在下面的帖子中学习：Can Jung graphics appear in the same place every time?