如何在Jung可视化上手动设置缩放？ [英] How to manually set the zoom on a Jung visualisation?

问题描述

我在JPanel中显示了一个jung树。我树的构造函数如下所示：

I have a jung tree displayed in a JPanel. The constructor of my tree looks like this:

  Forest<String, Integer> graph = new DelegateForest<String, Integer>();
  static GraphZoomScrollPane panel = null;
  static DefaultModalGraphMouse graphMouse = null;
  static JComboBox modeBox = null;
  static ScalingControl scaler;

  public PanelTree(List<Cluster> clist) {
    setBounds(215, 10, 550, 550);
    updateData(clist); // adds vertex and edges to graph

    treeLayout = new TreeLayout<String, Integer>(graph);
    vv = new VisualizationViewer<String, Integer>(treeLayout, new Dimension(500, 500));
    vv.setBackground(Color.white);
    vv.getRenderContext().setEdgeShapeTransformer(new EdgeShape.Line());
    vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
    // add a listener for ToolTips
    vv.setVertexToolTipTransformer(new ToStringLabeller());
    vv.getRenderContext()
            .setArrowFillPaintTransformer(new ConstantTransformer(Color.lightGray));

    panel = new GraphZoomScrollPane(vv);
    add(panel);

    graphMouse = new DefaultModalGraphMouse();

    vv.setGraphMouse(graphMouse);

    modeBox = graphMouse.getModeComboBox();
    modeBox.addItemListener(graphMouse.getModeListener());
    graphMouse.setMode(ModalGraphMouse.Mode.TRANSFORMING);

    scaler = new CrossoverScalingControl();
}

但树很大。所以我想知道是否有一种方法可以自动缩小以使树适合窗口，否则只需设置一个小于默认值的默认缩放。我怎么能这样做？

But the tree is quite large. So I want to know is there is a way to either automatically zoom out so the tree fits in the windows, and otherwise just set a default zoom that is less than the default one. How can I do that ?

推荐答案

如果使用鼠标变换器，ScalingControl不是好方法。

ScalingControl is not good method if you use Mouse Transformer.

尝试：

// for zoom:
vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT).setScale(scale_x1, scale_y1, vv.getCenter());
// for out:
vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW).setScale(scale_x2, scale_y2, vv.getCenter());

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