java - 荣格布局问题

Question

我有一些图表，我想使用 JUNG2 来显示它如下图所示。

我玩过 JUNG2 的一些布局，但我总是得到这样的图像:

是否可以在不编写新布局的情况下按照我的意愿对图形进行布局？

提前致谢

德米特里

UPD: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;
}

UPD 17.03.2011

现在我可以画这样的图了:

Answer 1

如果要固定特定顶点的位置，请在创建 Layout 之后以及将其添加到 VisualizationViewer/VisualizationImageServer 之前对每个顶点执行以下操作:

layout.setLocation(v, location);
layout.lock(v, true);

http://jung.sourceforge.net/doc/api/edu/uci/ics/jung/algorithms/layout/Layout.html