Geek asks and answers

Redraw the graph to JUNG

I will plot using JUNG (Java Universal Network / Graph Framework) with the following code:

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);

Now I want to add even more vertices and edges to the graph. How can i do this? What instructions should be followed to redraw the chart? Thank!

+3
source share
3 answers

If you are looking for redrawing a graph after user interaction, you should add EditingModalGraphMouse to your VisualizationViewer

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

the constructor must be provided with vertexFactory and edgeFactory objects derived from

Factory<E> and Factory<V>

whose task is to create a new instance of the edge / vertices class using the create () method

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

same for edgeFactory

+1
source

vv.repaint(), .

+5

:

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

For example, see how addVertex and addEdge are used in SimpleGraphView.java

+1
source

More articles:


All Articles