在 JUNG 上重绘图表

Question

我使用 JUNG（Java 通用网络/图形框架）构建一个图形，代码如下：

g = new SparseMultigraph<BusStop, Travel>();

//add some Vertex and Edges

Layout<String, String> layout1 = new CircleLayout(g);
layout1.setSize(new Dimension(300,300)); // sets the initial size of the layout space

VisualizationViewer vv = new VisualizationViewer(layout1);
vv.setPreferredSize(new Dimension(350,350)); //Sets the viewing area size

Transformer<BusStop,Paint> vertexPaint = new Transformer<BusStop,Paint>() {
    public Paint transform(BusStop b) {
        return Color.GREEN;
    }
};

Transformer<BusStop,Shape> vertexShape = new Transformer<BusStop,Shape>() {
    public Shape transform(BusStop b) {
        return new Rectangle(-20, -10, 40, 20);
    }
};

vv.getRenderContext().setVertexFillPaintTransformer(vertexPaint);
vv.getRenderContext().setVertexShapeTransformer(vertexShape);
vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
vv.getRenderer().getVertexLabelRenderer().setPosition(Position.CNTR);

GraphViewerForm = new edu.uci.ics.jung.visualization.GraphZoomScrollPane(vv);

现在，我想向图形添加更多顶点和边。我该怎么做？我应该运行什么指令才能重新绘制图表？谢谢！

Answer 1

向图形添加边和顶点后，必须调用 vv.repaint() 来绘制更改。

Answer 2

如果您希望在用户交互后重绘图形，则必须将 EditingModalGraphMouse 添加到 VisualizationViewer

    EditingModalGraphMouse gm = new EditingModalGraphMouse(vv.getRenderContext(), 
             vertexFactory, edgeFactory); 
    vv.setGraphMouse(gm);

构造函数必须提供 vertexFactory 和edgeFactory 派生对象，

Factory<E> and Factory<V>

create() 方法创建边/顶点类的新实例

Factory <BusStop> vertexFactory = new Factory<BusStop>() {
            public BusStop create() {
                return new BusStop();
            }
        };

其工作是通过与 edgeFactory 相同的

Answer 3

如果您想添加顶点和边：

//add some Vertex and Edges
g.addVertex((BusStop)obj1);
g.addVertex((BusStop)obj2);
g.addEdge((Travel) trv1, obj1, obj2);

例如，请参阅 addVertex 和 addEdge /JUNG/SimpleGraphView.java" rel="nofollow">SimpleGraphView.java