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在 Jung 中使用 EditingModalGraphMouse 时有没有办法获取顶点坐标？我已经使用坐标设置器和获取器为顶点创建了一个类，但我不知道如何使用特定坐标设置顶点？（我有一个变压器：变压器）

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1 回答 1

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以下为您提供有关如何在 Jung VisualizationViewer 实例上获取笛卡尔坐标的想法...

创建一个内部类如下：

protected class MyGraphMousePlugin extends TranslatingGraphMousePlugin implements MouseListener {

    @Override
    public void mouseMoved(MouseEvent e) {
        final VisualizationViewer<GeoLocationData.Station,GeoLocationData.Link> vv =
        (VisualizationViewer<GeoLocationData.Station,GeoLocationData.Link>)e.getSource();
        Point2D p = e.getPoint();//vv.getRenderContext().getBasicTransformer().inverseViewTransform(e.getPoint());
        GraphElementAccessor<GeoLocationData.Station,GeoLocationData.Link> pickSupport = vv.getPickSupport();
        if(pickSupport != null) {               
            vv.setToolTipText ("<html>x: "+p.getX()+"<br>y: "+p.getY());
        }
    }

    public MyGraphMousePlugin(int modifiers) {
        super(modifiers);
        // TODO Auto-generated constructor stub
    }

    public MyGraphMousePlugin() {
        super();
    }
}

将插件添加到您的 GraphMouse 实例：

graphMouse = new DefaultModalGraphMouse<Object, Object>();
vv.setGraphMouse(graphMouse);
vv.addKeyListener(graphMouse.getModeKeyListener());
graphMouse.add(new MyGraphMousePlugin());

编辑：

下一个修改将为您提供笛卡尔坐标，该坐标考虑了在 Jung 图布局上所做的平移：

protected class MyGraphMousePlugin extends TranslatingGraphMousePlugin implements MouseListener {

    @Override
    public void mouseMoved(final MouseEvent e) {

        SwingUtilities.invokeLater(
                new Runnable() {
                    public void run() {
                        final VisualizationViewer<GeoLocationData.Station,GeoLocationData.Link> vv =
                            (VisualizationViewer<GeoLocationData.Station,GeoLocationData.Link>)e.getSource();
                        Point2D p = e.getPoint();//vv.getRenderContext().getBasicTransformer().inverseViewTransform(e.getPoint());
                        GraphElementAccessor<GeoLocationData.Station,GeoLocationData.Link> pickSupport = vv.getPickSupport();
                        if(pickSupport != null) {

                            AffineTransform lat =
                                vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT).getTransform();
                            //AffineTransform vat =
                            //  vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW).getTransform();
                            //AffineTransform at = new AffineTransform();

                            double x = p.getX() - lat.getTranslateX(); //;
                            double y = p.getY() - lat.getTranslateY(); //;

                            vv.setToolTipText ("<html>x: "+x+"<br>y: "+y);
                        }

                    }
                }
        );
    }

    public MyGraphMousePlugin(int modifiers) {
        super(modifiers);
        // TODO Auto-generated constructor stub
    }

    public MyGraphMousePlugin() {
        super();
    }
}

它仍然不完美，因为它省略了比例因子，但你会明白的......

你需要从屏幕坐标系到视图坐标系到模型坐标系进行计算，得到模型的坐标。

上面代码中的泛型类型应该改成你自己的版本:)

已编辑

哈哈，线索已经有了，而且是正确的方法……不用计算！ http://sourceforge.net/projects/jung/forums/forum/252062/topic/3040266?message=6522779

    @Override
    public void mouseMoved(final MouseEvent e) {

        SwingUtilities.invokeLater(
                new Runnable() {
                    public void run() {
                        final VisualizationViewer<GeoLocationData.Station,GeoLocationData.Link> vv =
                            (VisualizationViewer<GeoLocationData.Station,GeoLocationData.Link>)e.getSource();
                        Point2D p = vv.getRenderContext().getMultiLayerTransformer().inverseTransform(e.getPoint());

                        double x = p.getX();
                        double y = p.getY();

                        vv.setToolTipText ("<html>x: "+(int)x+"<br>y: "+(int)y);
                    }
                }
        );
    }
于 2011-04-14T15:51:20.660 回答