如何在MVC中使用JUNG2？

Question

我在玩JUNG2，想要实现一个小的GUI，它允许我显示和更改一个图形。遵循JUNG库中的示例可以很好地工作，但它们不分离模型、视图和控制器。所以我开始用一个清晰的分离来构建GUI。

我的第一个版本的GUI应该是简单地显示一个初始图形。视图是模型的观察者，每当图形发生变化时，都会在图的初始化步骤中获得通知，这恰好发生了一次。然而，图形并没有显示在屏幕的中心(就像在非MVC示例中那样)，但是我可以在左上角看到其中的一小部分。

现在，这引出了一个普遍的问题:我如何告诉jung-可视化组件，模型发生了变化？接下来:我如何使用现成的组件，比如MVC体系结构中的Jung-老鼠？JUNG似乎有混合的模型，视图和控制器，我不知道如何和在哪里正确地使用它们。

编辑: Jung教程展示了如何使用鼠标管理更改，但它没有显示如何根据模型中的更改更改视图(通过其他选项，例如“添加节点”按钮或其他选项)

到目前为止，这是我第一次尝试：

视图

public class MOCView implements GraphChangeObserver {

private final ControllerInterface controller;
private final MOCModelInterface model;
private Layout<Node, Edge> layout;
private BasicVisualizationServer<Node, Edge> visualization;
private JFrame frame;

public MOCView(final ControllerInterface controller,
        final MOCModelInterface model) {
    this.controller = controller;
    this.model = model;
    model.registerObserver(this);
}

public void createView() {
    this.layout = new CircleLayout<Node, Edge>(this.model.getGraph());
    this.layout.setSize(new Dimension(300, 300));
    this.visualization = new BasicVisualizationServer<Node, Edge>(
            this.layout);
    this.visualization.setPreferredSize(new Dimension(350, 350));

    this.frame = new JFrame("MOC View");
    this.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.frame.getContentPane().add(this.visualization);
    this.frame.pack();
    this.frame.setVisible(true);
}

@Override
public void updateGraph() {
    this.visualization.repaint();
}
}

模型

public class MOCModel implements MOCModelInterface {

private final Graph<Node, Edge> graph = new DirectedSparseGraph<Node, Edge>();
private final ArrayList<GraphChangeObserver> graphChangeObservers = new ArrayList<GraphChangeObserver>();

@Override
public void initialize() {
    this.generateInitialGraph();
}

@Override
public Graph<Node, Edge> getGraph() {
    return this.graph;
}

@Override
public void registerObserver(final GraphChangeObserver o) {
    this.graphChangeObservers.add(o);
}

@Override
public void removeObserver(final GraphChangeObserver o) {
    this.graphChangeObservers.remove(o);
}

private void generateInitialGraph() {
    final Node nodeA = new Node("Node A");
    this.graph.addVertex(nodeA);
    final Node nodeB = new Node("Node B");
    this.graph.addVertex(nodeB);
    final Node nodeC = new Node("Node C");
    this.graph.addVertex(nodeC);
    final Node nodeD = new Node("Node D");
    this.graph.addVertex(nodeD);
    final Node nodeE = new Node("Node E");
    this.graph.addVertex(nodeE);
    this.graph.addEdge(new Edge("Edge 1"), nodeA, nodeB);
    this.graph.addEdge(new Edge("Edge 2"), nodeA, nodeC);
    this.graph.addEdge(new Edge("Edge 3"), nodeB, nodeC);
    this.graph.addEdge(new Edge("Edge 4"), nodeC, nodeD);
    this.graph.addEdge(new Edge("Edge 5"), nodeD, nodeE);
    this.graph.addEdge(new Edge("Edge 6"), nodeA, nodeE);
    this.graph.addEdge(new Edge("Edge 7"), nodeE, nodeA);
    this.graph.addEdge(new Edge("Edge 8"), nodeD, nodeB);
    notifyGraphChangeObservers();
}

private void notifyGraphChangeObservers() {
    for (final GraphChangeObserver gco : this.graphChangeObservers) {
        gco.updateGraph();
    }
}
}

控制器

public class MOCController implements ControllerInterface {

private final MOCModelInterface model;
private final MOCView view;

public MOCController(final MOCModelInterface model) {
    this.model = model;
    this.view = new MOCView(this, model);
    this.view.createView();
    this.model.initialize();
}
}

主类

public class MOCStart {

/**
 * @param args
 */
public static void main(final String[] args) {
    final MOCModelInterface model = new MOCModel();
    new MOCController(model);
}

}

Answer 1

了解JUNG2如何工作的最佳方法是使用Maven svn checkout http://jung.googlecode.com/svn/trunk/ jung-read-only通过m2e Maven Eclipse插件查看SVN存储库中的示例

从这里开始，查看包edu.uci.ics.jung.samples，查看涉及图形鼠标的各种JUNG2代码示例:例如，GraphEditorDemo.java

注意事项：应用下面的SVN修补程序来纠正一些bug

### Eclipse Workspace Patch 1.0
#P jung-io
Index: src/test/java/edu/uci/ics/jung/io/TestGraphMLReader.java
===================================================================
--- src/test/java/edu/uci/ics/jung/io/TestGraphMLReader.java    (revision 31)
+++ src/test/java/edu/uci/ics/jung/io/TestGraphMLReader.java    (working copy)
@@ -125,7 +125,7 @@
     public void testAttributes() throws IOException
     {
         Graph<Number, Number> graph = new UndirectedSparseGraph<Number, Number>();
-        gmlreader.load("src/test/resources/attributes.graphml", graph);
+        gmlreader.load("src/test/resources/edu/uci/ics/jung/io/graphml/attributes.graphml", graph);

         Assert.assertEquals(graph.getVertexCount(), 6);
         Assert.assertEquals(graph.getEdgeCount(), 7);
@@ -193,7 +193,7 @@
         GraphMLReader<Hypergraph<Number, Number>, Number, Number> hyperreader = 
             new GraphMLReader<Hypergraph<Number, Number>, Number, Number>(
                 vertexFactory, edgeFactory);
-        hyperreader.load("src/test/resources/hyper.graphml", graph);
+        hyperreader.load("src/test/resources/edu/uci/ics/jung/io/graphml/hyper.graphml", graph);

         Assert.assertEquals(graph.getVertexCount(), 7);
         Assert.assertEquals(graph.getEdgeCount(), 4);

### Eclipse Workspace Patch 1.0
#P jung2
Index: jung-visualization/src/main/java/edu/uci/ics/jung/visualization/control/EditingPopupGraphMousePlugin.java
===================================================================
--- jung-visualization/src/main/java/edu/uci/ics/jung/visualization/control/EditingPopupGraphMousePlugin.java   (revision 31)
+++ jung-visualization/src/main/java/edu/uci/ics/jung/visualization/control/EditingPopupGraphMousePlugin.java   (working copy)
@@ -54,6 +54,8 @@
             final PickedState<V> pickedVertexState = vv.getPickedVertexState();
             final PickedState<E> pickedEdgeState = vv.getPickedEdgeState();

+            popup.removeAll();
+            
             if(vertex != null) {
                Set<V> picked = pickedVertexState.getPicked();
                if(picked.size() > 0) {