我在玩 JUNG2，想实现一个小 GUI，让我可以显示和更改图表。遵循 JUNG 库中的示例效果很好，但它们没有将模型、视图和控制器分开。所以我开始用干净的分离来构建 GUI。
我的第一个 GUI 版本应该是简单地显示一个初始图形。视图是模型的观察者，并且在图的初始化步骤中，只要图发生变化（恰好发生一次）就会收到通知。但是，该图没有显示在屏幕中央（就像在非 MVC 示例中一样），但我可以在左上角看到它的一小部分。
现在，这导致了一个普遍的问题：我如何告诉 Jung-visualization 组件，模型发生了变化？稍后：如何使用现成的组件，例如 MVC 架构中的 Jung-Mouse？JUNG 似乎混合了模型、视图和控制器，我不确定如何以及在何处正确使用它们。
编辑： Jung 教程展示了如何使用鼠标管理更改，但没有显示如何根据模型中的更改更改视图（通过其他选项，例如按钮“添加节点”或其他东西）
这是我迄今为止的第一次尝试：
风景
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();
}
}
该模型
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();
}
}
主班
public class MOCStart {
/**
* @param args
*/
public static void main(final String[] args) {
final MOCModelInterface model = new MOCModel();
new MOCController(model);
}
}