漫谈可视化Prefuse（二）---一分钟学会Prefuse

　　前篇《漫谈可视化Prefuse（一）---从SQL Server数据库读取数据》主要介绍了prefuse如何连接数据库sql server并读取数据进行可视化展现。

　　回头想想还是应该好好捋一捋prefuse框架中各个主要接口的职责以及如何有序使用它们构建一个prefuse应用。首先看图：

　　从图中可以发现一个prefuse程序的编写需要经历以下步骤：

1. 准备好原始数据（文件或是数据库数据）；
2. 通过prefuse.data.io以及prefuse.data.io.sql包将数据读入prefuse，实现原始数据与内置丰富的数据结构如Table、Graph、Tree等之间的映射；
3. 为数据添加各种Action，执行布局、着色、设置形状等操作；
4. 将上面处理好的数据存入数据存储中心Visuallization中；
5. 为可视化组件添加渲染器Renderer，并将渲染器注册到Visualization上；
6. 通过Display将Visualization中的可视化组件显示到屏幕上；
7. 通过上图发现是个闭环图，当执行控制器以及过滤操作后又会得到更新后的Visualization，之后依次执行3、4、5、6步骤。

　　下面我们通过一个例子具体了解如何创建一个prefuse应用。

1. 加载数据：

首先是加载图数据到Prefuse的图实例中，这里用的是socialnet.xml数据集。代码中使用GraphMLReader类读取数据集。

在方法readGraph中关于能读取“/socialnet.xml”文件的说明：通过读源码发现首先会检查这个字符串是不是一个URL链接，如果是的话则直接打开这个链接，如果不是则检查其是否是一个Java Runtime 内的classpath资源链接，如果还不是，则会将该字符串视为一个文件或是文件系统。

Graph graph = null;

try {

    graph = new GraphMLReader().readGraph("/socialnet.xml");

} catch ( DataIOException e ) {

    e.printStackTrace();

    System.err.println("Error loading graph. Exiting...");

    System.exit(1);

}

2 .创建数据存储中心Visualization实例：

　　创建一个抽象的视觉图形。在此之前，需要创建一个Visualization实例并添加图形数据，同时在代码中可以看到还要赋给一个名称（group name）。当图或树的实例添加到Visualization对象上的时候，另外两个子组名（subgroups）也会自动被创建：一个是节点（以“.nodes”为后缀），一个是边（以“.edges”为后缀）

// add the graph to the visualization as the data group "graph"

// nodes and edges are accessible as "graph.nodes" and "graph.edges"

Visualization vis = new Visualization();

vis.add("graph", graph);

3.渲染和渲染工厂的创建：

　　使用Renderers渲染器绘制Visualization对象中的VisualItems。默认情况下，Visualization类中包含了DefaultRendererFactory，其使用EdgeRenderer（默认绘制直连边）、ShapeRenderer绘制图形（比如正方形或三角形）。当希望看到节点上标签值是，可以创建一个LabelRenderers并为标签数据域赋值。

// draw the "name" label for NodeItems

LabelRenderer r = new LabelRenderer("name");

r.setRoundedCorner(8, 8); // round the corners

// create a new default renderer factory

// return our name label renderer as the default for all non-EdgeItems

// includes straight line edges for EdgeItems by default

vis.setRendererFactory(new DefaultRendererFactory(r));

4.添加处理的动作Actions：

　　添加所需的视觉效果。通过创建不同的Action模块处理Visualization上的VisualItems。比如可以创建一个颜色动作事件（ColorActions），该VisualItem默认支持三种颜色赋值：描边颜色、填充颜色以及文本颜色。描边的颜色是线条和轮廓的颜色；填充颜色是VisualItem的内部颜色；文本颜色是文本或是标签的颜色。默认情况下，所有颜色都是纯透明的。ColorLib类提供了很多颜色赋值的方法。

　　通过以下代码可以看出通过创建DataColorAction完成颜色分配工作。DataColorAction构造器的参数如下：

　　（1）要运行的数据组名（这里是graph.nodes）

　　（2）数据域的名称（这里是gender）

　　（3）数据域的数据类型，有三种：NOMINAL（适用于类别标签集），ORDINAL（适用于有序集合），以及NUMERICAL（适用于数字）。

　　（4）颜色域的设置，有描边、填充和文本三种。

　　（5）可选的调色板

　　注意：这里DataColorAction对于赋值颜色的选取也是有排序的，一般是自然排序的顺序，比如对于文本来说是按照字母表的先后顺序来的。这就是为什么这里的粉红色排在前面，因为按照字母顺序，“F”排在“M”的前面。

// create our nominal color palette

// pink for females, baby blue for males

int[] palette = new int[] {

    ColorLib.rgb(255,180,180), ColorLib.rgb(190,190,255)

};

// map nominal data values to colors using our provided palette

DataColorAction fill = new DataColorAction("graph.nodes", "gender",  Constants.NOMINAL, VisualItem.FILLCOLOR, palette);

// use black for node text

ColorAction text = new ColorAction("graph.nodes", VisualItem.TEXTCOLOR, ColorLib.gray(0));

// use light grey for edges

ColorAction edges = new ColorAction("graph.edges",

    VisualItem.STROKECOLOR, ColorLib.gray(200));

// create an action list containing all color assignments

ActionList color = new ActionList();

color.add(fill);

color.add(text);

color.add(edges);

　　接着再创建关于动画布局的ActionList。所有的Action都可以进行参数控制的指定运行多少次（默认情况下是一次），也可以限定指定间隔时间运行，或者指定间隔时间无限制运行。代码中通过添加ForceDirectedLayout布局来进行图中节点的位置更新。添加RepaintAction（）来实现当布局重新计算后就进行图形重绘的功能。

// create an action list with an animated layout

// the INFINITY parameter tells the action list to run indefinitely

ActionList layout = new ActionList(Activity.INFINITY);

layout.add(new ForceDirectedLayout("graph"));

layout.add(new RepaintAction());

　　然后将这两个ActionLists添加到Visualization上，每个注册的Action都有唯一标示以方便调用。

// add the actions to the visualization

vis.putAction("color", color);

vis.putAction("layout", layout);

5.展现和交互控制：

　　创建Display实现数据可视化。这里创建一个Display实例将Visualization中的Visualitems进行参数配置。可以设置想要展现的Display的大小、像素。这里，我们添加三个交互控制器：

　　（1）         拖拽控制

　　（2）         平移控制

　　（3）         缩放控制

// create a new Display that pull from our Visualization

Display display = new Display(vis);

display.setSize(720, 500); // set display size

display.addControlListener(new DragControl()); // drag items around

display.addControlListener(new PanControl());  // pan with background left-drag

display.addControlListener(new ZoomControl()); // zoom with vertical right-drag

6.可视化呈现：

　　剩下要做的就是添加Display显示到一个应用程序窗口并让程序运行。该例中，创建Java Swing编程中的顶级类JFrame，设置标题。“pack”可以使得窗口合适的布局并确保窗口可见。

// create a new window to hold the visualization

JFrame frame = new JFrame("prefuse example");

// ensure application exits when window is closed

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(display);

frame.pack();           // layout components in window

frame.setVisible(true); // show the window

vis.run("color");  // assign the colors

vis.run("layout"); // start up the animated layout

执行结果如下：

　　

　　另外，在《可视化工具solo show-----Prefuse自带例子GraphView讲解》篇中，对GraphView.java进行了阅读并注释，这里再贴出RadialGraphView.java和TreeView.java的部分注释。

RadialGraphView.java

public class RadialGraphView extends Display {

    public static final String DATA_FILE = "socialnet.xml";
    private static final String tree = "tree";
    private static final String treeNodes = "tree.nodes";
    private static final String treeEdges = "tree.edges";
    private static final String linear = "linear";

    private LabelRenderer m_nodeRenderer;
    private EdgeRenderer m_edgeRenderer;

    private String m_label = "label";

    public RadialGraphView(Graph g, String label) {
        super(new Visualization());
        m_label = label;

        // -- set up visualization --
        m_vis.add(tree, g);//将graph对象添加到m_vis对象上
        m_vis.setInteractive(treeEdges, null, false);

        // -- set up renderers --   设置点和边的渲染器
        m_nodeRenderer = new LabelRenderer(m_label);
        m_nodeRenderer.setRenderType(AbstractShapeRenderer.RENDER_TYPE_FILL);
        m_nodeRenderer.setHorizontalAlignment(Constants.CENTER);
        m_nodeRenderer.setRoundedCorner(8,8);
        m_edgeRenderer = new EdgeRenderer();

        DefaultRendererFactory rf = new DefaultRendererFactory(m_nodeRenderer);
        rf.add(new InGroupPredicate(treeEdges), m_edgeRenderer);
        m_vis.setRendererFactory(rf);

        // -- set up processing actions --

        // colors
        ItemAction nodeColor = new NodeColorAction(treeNodes);
        ItemAction textColor = new TextColorAction(treeNodes);
        m_vis.putAction("textColor", textColor);

        ItemAction edgeColor = new ColorAction(treeEdges,
                VisualItem.STROKECOLOR, ColorLib.rgb(200,200,200));//新建边颜色Action

        FontAction fonts = new FontAction(treeNodes,
                FontLib.getFont("Tahoma", 10));//设置节点大小以及字体
        fonts.add("ingroup('_focus_')", FontLib.getFont("Tahoma", 11));

        // recolor   新建重新着色ActionList，并添加上面的节点和边Action
        ActionList recolor = new ActionList();
        recolor.add(nodeColor);
        recolor.add(textColor);
        m_vis.putAction("recolor", recolor);

        // repaint   新建重绘ActionList，并加入recolor以及RepaintAction
        ActionList repaint = new ActionList();
        repaint.add(recolor);
        repaint.add(new RepaintAction());
        m_vis.putAction("repaint", repaint);

        // animate paint change
        ActionList animatePaint = new ActionList(400);
        animatePaint.add(new ColorAnimator(treeNodes));
        animatePaint.add(new RepaintAction());
        m_vis.putAction("animatePaint", animatePaint);

        // create the tree layout action   采用径向树布局
        RadialTreeLayout treeLayout = new RadialTreeLayout(tree);
        //treeLayout.setAngularBounds(-Math.PI/2, Math.PI);
        m_vis.putAction("treeLayout", treeLayout);

        CollapsedSubtreeLayout subLayout = new CollapsedSubtreeLayout(tree);//折叠子树布局
        m_vis.putAction("subLayout", subLayout);

        // create the filtering and layout   创建过滤器和布局     在图形呈现之前，做好过滤filter工作
        ActionList filter = new ActionList();
        filter.add(new TreeRootAction(tree));
        filter.add(fonts);
        filter.add(treeLayout);
        filter.add(subLayout);
        filter.add(textColor);
        filter.add(nodeColor);
        filter.add(edgeColor);
        m_vis.putAction("filter", filter);

        // animated transition  动画过渡
        ActionList animate = new ActionList(1250);
        animate.setPacingFunction(new SlowInSlowOutPacer());//起搏功能，提供渐入渐出效果
        animate.add(new QualityControlAnimator());//可以平滑切换动画的动画控制器
        animate.add(new VisibilityAnimator(tree));
        animate.add(new PolarLocationAnimator(treeNodes, linear));
        animate.add(new ColorAnimator(treeNodes));
        animate.add(new RepaintAction());
        m_vis.putAction("animate", animate);
        m_vis.alwaysRunAfter("filter", "animate");

         // initialize the display
        setSize(600,600);//初始化JFrame大小      注意：这里没有像GraphView一样创建Display对象，是因为该类RadialGraphView继承 了Display，可以直接调用方法
        setItemSorter(new TreeDepthItemSorter());//为树状深度设置排序分类器
        addControlListener(new DragControl());//一下都是设置监听类，包括拖拽、缩放至适合显示、平移、聚焦、悬停
        addControlListener(new ZoomToFitControl());
        addControlListener(new ZoomControl());
        addControlListener(new PanControl());
        addControlListener(new FocusControl(1, "filter"));
        addControlListener(new HoverActionControl("repaint"));

        // filter graph and perform layout
        m_vis.run("filter");

        // maintain a set of items that should be interpolated linearly
        // this isn't absolutely necessary, but makes the animations nicer
        // the PolarLocationAnimator should read this set and act accordingly
        m_vis.addFocusGroup(linear, new DefaultTupleSet());
        m_vis.getGroup(Visualization.FOCUS_ITEMS).addTupleSetListener(//添加数据集监听器，监听数据变化
            new TupleSetListener() {
                public void tupleSetChanged(TupleSet t, Tuple[] add, Tuple[] rem) {
                    TupleSet linearInterp = m_vis.getGroup(linear);
                    if ( add.length < 1 ) return; linearInterp.clear();
                    for ( Node n = (Node)add[0]; n!=null; n=n.getParent() )
                        linearInterp.addTuple(n);
                }
            }
        );

        SearchTupleSet search = new PrefixSearchTupleSet();//监听搜索栏数据
        m_vis.addFocusGroup(Visualization.SEARCH_ITEMS, search);
        search.addTupleSetListener(new TupleSetListener() {
            public void tupleSetChanged(TupleSet t, Tuple[] add, Tuple[] rem) {
                m_vis.cancel("animatePaint");
                m_vis.run("recolor");
                m_vis.run("animatePaint");
            }
        });
    }

    // ------------------------------------------------------------------------

    public static void main(String argv[]) {
        String infile = DATA_FILE;
        String label = "name";

        if ( argv.length > 1 ) {
            infile = argv[0];
            label = argv[1];
        }

        UILib.setPlatformLookAndFeel();

        JFrame frame = new JFrame("p r e f u s e  |  r a d i a l g r a p h v i e w");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(demo(infile, label));
        frame.pack();
        frame.setVisible(true);
    }

    public static JPanel demo() {
        return demo(DATA_FILE, "name");
    }

    public static JPanel demo(String datafile, final String label) {
        Graph g = null;
        try {
            g = new GraphMLReader().readGraph(datafile);
        } catch ( Exception e ) {
            e.printStackTrace();
            System.exit(1);
        }
        return demo(g, label);
    }

    public static JPanel demo(Graph g, final String label) {
        // create a new radial tree view    //创建一个径向树形布局
        final RadialGraphView gview = new RadialGraphView(g, label);
        Visualization vis = gview.getVisualization();

        // create a search panel for the tree map
        SearchQueryBinding sq = new SearchQueryBinding(
             (Table)vis.getGroup(treeNodes), label,
             (SearchTupleSet)vis.getGroup(Visualization.SEARCH_ITEMS));
        JSearchPanel search = sq.createSearchPanel();
        search.setShowResultCount(true);
        search.setBorder(BorderFactory.createEmptyBorder(5,5,4,0));
        search.setFont(FontLib.getFont("Tahoma", Font.PLAIN, 11));

        final JFastLabel title = new JFastLabel("                 ");
        title.setPreferredSize(new Dimension(350, 20));
        title.setVerticalAlignment(SwingConstants.BOTTOM);
        title.setBorder(BorderFactory.createEmptyBorder(3,0,0,0));
        title.setFont(FontLib.getFont("Tahoma", Font.PLAIN, 16));

        gview.addControlListener(new ControlAdapter() {//为搜索框添加监听事件
            public void itemEntered(VisualItem item, MouseEvent e) {
                if ( item.canGetString(label) )//如果搜索框文本发生变化，则将最新文本值赋给搜索文本框
                    title.setText(item.getString(label));
            }
            public void itemExited(VisualItem item, MouseEvent e) {//如果搜索框失去焦点，则置搜索文本框值为空
                title.setText(null);
            }
        });

        Box box = new Box(BoxLayout.X_AXIS);//创建盒子容器，装在上面的搜索面板和搜索文本框（安装水平方向布局）
        box.add(Box.createHorizontalStrut(10));
        box.add(title);
        box.add(Box.createHorizontalGlue());
        box.add(search);
        box.add(Box.createHorizontalStrut(3));

        JPanel panel = new JPanel(new BorderLayout());//按照组件级别从小到大，先创建JPanel对象，并将上面的RadialGraphView和Box注册到JPanel上
        panel.add(gview, BorderLayout.CENTER);//RadialGraphView对象放到面板中间位置
        panel.add(box, BorderLayout.SOUTH);//Box对象放到面板南边位置

        Color BACKGROUND = Color.WHITE;
        Color FOREGROUND = Color.DARK_GRAY;
        UILib.setColor(panel, BACKGROUND, FOREGROUND);//设置整个panel面板的前景和背景颜色

        return panel;
    }

    /**
     * Switch the root of the tree by requesting a new spanning tree
     * at the desired root
     */
    public static class TreeRootAction extends GroupAction {
        public TreeRootAction(String graphGroup) {
            super(graphGroup);
        }
        public void run(double frac) {
            TupleSet focus = m_vis.getGroup(Visualization.FOCUS_ITEMS);//如果没有点被选中或选中为空则跳出run函数
            if ( focus==null || focus.getTupleCount() == 0 ) return;

            Graph g = (Graph)m_vis.getGroup(m_group);
            Node f = null;
            Iterator tuples = focus.tuples();
            while (tuples.hasNext() && !g.containsTuple(f=(Node)tuples.next()))//迭代选中的焦点，如果选中焦点不是上次的焦点，则置f为空，并跳出run函数
            {
                f = null;
            }
            if ( f == null ) return;
            g.getSpanningTree(f);//返回一个生成树
        }
    }

    /**
     * Set node fill colors    设置点的填充色
     */
    public static class NodeColorAction extends ColorAction {
        public NodeColorAction(String group) {
            super(group, VisualItem.FILLCOLOR, ColorLib.rgba(255,255,255,0));
            add("_hover", ColorLib.gray(220,230));
            add("ingroup('_search_')", ColorLib.rgb(255,190,190));
            add("ingroup('_focus_')", ColorLib.rgb(198,229,229));
        }

    } // end of inner class NodeColorAction

    /**
     * Set node text colors     设置点内文本颜色
     */
    public static class TextColorAction extends ColorAction {
        public TextColorAction(String group) {
            super(group, VisualItem.TEXTCOLOR, ColorLib.gray(0));
            add("_hover", ColorLib.rgb(255,0,0));
        }
    } // end of inner class TextColorAction

} // end of class RadialGraphView

TreeView.java

public class TreeView extends Display {

    public static final String TREE_CHI = "chi-ontology.xml.gz";
    private static final String tree = "tree";
    private static final String treeNodes = "tree.nodes";
    private static final String treeEdges = "tree.edges";

    private LabelRenderer m_nodeRenderer;
    private EdgeRenderer m_edgeRenderer;

    private String m_label = "label";
    private int m_orientation = Constants.ORIENT_LEFT_RIGHT;//设置树的布局方式，有left->right,right->left,top->bottom,bottom->top共四种方式

    public TreeView(Tree t, String label) {
        super(new Visualization());
        m_label = label;
        m_vis.add(tree, t);//将tree注册到m_vis对象上

        m_nodeRenderer = new LabelRenderer(m_label);//新建节点和边的渲染器
        m_nodeRenderer.setRenderType(AbstractShapeRenderer.RENDER_TYPE_FILL);
        m_nodeRenderer.setHorizontalAlignment(Constants.LEFT);
        m_nodeRenderer.setRoundedCorner(8,8);
        m_edgeRenderer = new EdgeRenderer(Constants.EDGE_TYPE_CURVE);

        DefaultRendererFactory rf = new DefaultRendererFactory(m_nodeRenderer);
        rf.add(new InGroupPredicate(treeEdges), m_edgeRenderer);
        m_vis.setRendererFactory(rf);//将上面的点和边的渲染器注册到DefaultRendererFactory，再添加到m_vis对象上

        // colors
        ItemAction nodeColor = new NodeColorAction(treeNodes);
        ItemAction textColor = new ColorAction(treeNodes,
                VisualItem.TEXTCOLOR, ColorLib.rgb(0,0,0));
        m_vis.putAction("textColor", textColor);

        ItemAction edgeColor = new ColorAction(treeEdges,
                VisualItem.STROKECOLOR, ColorLib.rgb(200,200,200));

        // quick repaint
        ActionList repaint = new ActionList();
        repaint.add(nodeColor);
        repaint.add(new RepaintAction());
        m_vis.putAction("repaint", repaint);

        // full paint
        ActionList fullPaint = new ActionList();
        fullPaint.add(nodeColor);
        m_vis.putAction("fullPaint", fullPaint);

        // animate paint change
        ActionList animatePaint = new ActionList(400);
        animatePaint.add(new ColorAnimator(treeNodes));
        animatePaint.add(new RepaintAction());
        m_vis.putAction("animatePaint", animatePaint);

        // create the tree layout action
        NodeLinkTreeLayout treeLayout = new NodeLinkTreeLayout(tree,
                m_orientation, 50, 0, 8);//50代表树深度之间的距离      0代表兄弟节点之间的距离    8代表相邻子树之间的距离
        treeLayout.setLayoutAnchor(new Point2D.Double(25,300));
        m_vis.putAction("treeLayout", treeLayout);

        CollapsedSubtreeLayout subLayout =
            new CollapsedSubtreeLayout(tree, m_orientation);
        m_vis.putAction("subLayout", subLayout);

        AutoPanAction autoPan = new AutoPanAction();

        // create the filtering and layout    在图形呈现之前，做好过滤filter工作，包括默认显示几层树，采用什么布局，节点和边如何展示等等
        ActionList filter = new ActionList();
        filter.add(new FisheyeTreeFilter(tree, 2));//添加一个鱼眼树形过滤器    设置初始界面显示几层节点
        filter.add(new FontAction(treeNodes, FontLib.getFont("Tahoma", 16)));
        filter.add(treeLayout);
        filter.add(subLayout);
        filter.add(textColor);
        filter.add(nodeColor);
        filter.add(edgeColor);
        m_vis.putAction("filter", filter);

        // animated transition          动画过渡
        ActionList animate = new ActionList(1000);
        animate.setPacingFunction(new SlowInSlowOutPacer());//使用SlowInSlowOutPacer可以实现一开始速度缓慢，中途加速，即将停止之前变慢的效果
        animate.add(autoPan);
        animate.add(new QualityControlAnimator());
        animate.add(new VisibilityAnimator(tree));
        animate.add(new LocationAnimator(treeNodes));
        animate.add(new ColorAnimator(treeNodes));
        animate.add(new RepaintAction());//从RepaintAction的构造函数可以看出每次执行RepaintAction时都会执行m_vis，即刷新执行一个上面的m_vis，所以就不需要add上面的sublayout、treelayout、filter等，因为这些已经被putAction进入m_vis了
        m_vis.putAction("animate", animate);
        m_vis.alwaysRunAfter("filter", "animate");//第一个参数：等待的Action名称    第二个参数：第一个Action运行完再运行的Action

        // create animator for orientation changes   针对图形布局方向改变时进行的操作
        ActionList orient = new ActionList(2000);
        orient.setPacingFunction(new SlowInSlowOutPacer());
        orient.add(autoPan);
        orient.add(new QualityControlAnimator());
        orient.add(new LocationAnimator(treeNodes));
        orient.add(new RepaintAction());
        m_vis.putAction("orient", orient);

        // initialize the display
        setSize(700,600);
        setItemSorter(new TreeDepthItemSorter());
        addControlListener(new ZoomToFitControl());
        addControlListener(new ZoomControl());
        addControlListener(new WheelZoomControl());
        addControlListener(new PanControl());
        addControlListener(new FocusControl(1, "filter"));//其中1代表鼠标聚焦点击的次数

        registerKeyboardAction(//注册快捷键响应事件  ctrl+1、ctrl+2、ctrl+3、ctrl+4分别对应不同的布局方式
            new OrientAction(Constants.ORIENT_LEFT_RIGHT),
            "left-to-right", KeyStroke.getKeyStroke("ctrl 1"), WHEN_FOCUSED);
        registerKeyboardAction(
            new OrientAction(Constants.ORIENT_TOP_BOTTOM),
            "top-to-bottom", KeyStroke.getKeyStroke("ctrl 2"), WHEN_FOCUSED);
        registerKeyboardAction(
            new OrientAction(Constants.ORIENT_RIGHT_LEFT),
            "right-to-left", KeyStroke.getKeyStroke("ctrl 3"), WHEN_FOCUSED);
        registerKeyboardAction(
            new OrientAction(Constants.ORIENT_BOTTOM_TOP),
            "bottom-to-top", KeyStroke.getKeyStroke("ctrl 4"), WHEN_FOCUSED);

        // ------------------------------------------------

        // filter graph and perform layout
        setOrientation(m_orientation);
        m_vis.run("filter");

        TupleSet search = new PrefixSearchTupleSet();
        m_vis.addFocusGroup(Visualization.SEARCH_ITEMS, search);
        search.addTupleSetListener(new TupleSetListener() {
            public void tupleSetChanged(TupleSet t, Tuple[] add, Tuple[] rem) {
                m_vis.cancel("animatePaint");
                m_vis.run("fullPaint");
                m_vis.run("animatePaint");
            }
        });
    }

    public void setOrientation(int orientation) {
        NodeLinkTreeLayout rtl
            = (NodeLinkTreeLayout)m_vis.getAction("treeLayout");
        CollapsedSubtreeLayout stl
            = (CollapsedSubtreeLayout)m_vis.getAction("subLayout");
        switch ( orientation ) {
        case Constants.ORIENT_LEFT_RIGHT:
            m_nodeRenderer.setHorizontalAlignment(Constants.LEFT);
            m_edgeRenderer.setHorizontalAlignment1(Constants.RIGHT);
            m_edgeRenderer.setHorizontalAlignment2(Constants.LEFT);
            m_edgeRenderer.setVerticalAlignment1(Constants.CENTER);
            m_edgeRenderer.setVerticalAlignment2(Constants.CENTER);
            break;
        case Constants.ORIENT_RIGHT_LEFT:
            m_nodeRenderer.setHorizontalAlignment(Constants.RIGHT);
            m_edgeRenderer.setHorizontalAlignment1(Constants.LEFT);
            m_edgeRenderer.setHorizontalAlignment2(Constants.RIGHT);
            m_edgeRenderer.setVerticalAlignment1(Constants.CENTER);
            m_edgeRenderer.setVerticalAlignment2(Constants.CENTER);
            break;
        case Constants.ORIENT_TOP_BOTTOM:
            m_nodeRenderer.setHorizontalAlignment(Constants.CENTER);
            m_edgeRenderer.setHorizontalAlignment1(Constants.CENTER);
            m_edgeRenderer.setHorizontalAlignment2(Constants.CENTER);
            m_edgeRenderer.setVerticalAlignment1(Constants.BOTTOM);
            m_edgeRenderer.setVerticalAlignment2(Constants.TOP);
            break;
        case Constants.ORIENT_BOTTOM_TOP:
            m_nodeRenderer.setHorizontalAlignment(Constants.CENTER);
            m_edgeRenderer.setHorizontalAlignment1(Constants.CENTER);
            m_edgeRenderer.setHorizontalAlignment2(Constants.CENTER);
            m_edgeRenderer.setVerticalAlignment1(Constants.TOP);
            m_edgeRenderer.setVerticalAlignment2(Constants.BOTTOM);
            break;
        default:
            throw new IllegalArgumentException(
                "Unrecognized orientation value: "+orientation);
        }
        m_orientation = orientation;
        rtl.setOrientation(orientation);
        stl.setOrientation(orientation);
    }

    public int getOrientation() {
        return m_orientation;
    }

    // ------------------------------------------------------------------------

    public static void main(String argv[]) {
        String infile = TREE_CHI;
        String label = "name";
        if ( argv.length > 1 ) {
            infile = argv[0];
            label = argv[1];
        }
        JComponent treeview = demo(infile, label);

        JFrame frame = new JFrame("p r e f u s e  |  t r e e v i e w");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(treeview);
        frame.pack();
        frame.setVisible(true);
    }

    public static JComponent demo() {
        return demo(TREE_CHI, "name");
    }

    public static JComponent demo(String datafile, final String label) {
        Color BACKGROUND = Color.WHITE;
        Color FOREGROUND = Color.BLACK;

        Tree t = null;
        try {
            t = (Tree)new TreeMLReader().readGraph(datafile);
        } catch ( Exception e ) {
            e.printStackTrace();
            System.exit(1);
        }

        // create a new treemap    创建一个树状图并设置前景背景颜色
        final TreeView tview = new TreeView(t, label);
        tview.setBackground(BACKGROUND);
        tview.setForeground(FOREGROUND);

        // create a search panel for the tree map    为树状图添加一个搜索文本标签
        JSearchPanel search = new JSearchPanel(tview.getVisualization(),
            treeNodes, Visualization.SEARCH_ITEMS, label, true, true);
        search.setShowResultCount(true);//显示搜索符合条件的节点个数
        search.setBorder(BorderFactory.createEmptyBorder(5,5,4,0));
        search.setFont(FontLib.getFont("Tahoma", Font.PLAIN, 11));
        search.setBackground(BACKGROUND);
        search.setForeground(FOREGROUND);

        final JFastLabel title = new JFastLabel("                 ");//为树状图添加一个搜索面板
        title.setPreferredSize(new Dimension(350, 20));//长350 宽20
        title.setVerticalAlignment(SwingConstants.BOTTOM);
        title.setBorder(BorderFactory.createEmptyBorder(3,0,0,0));
        title.setFont(FontLib.getFont("Tahoma", Font.PLAIN, 16));
        title.setBackground(BACKGROUND);
        title.setForeground(FOREGROUND);

        tview.addControlListener(new ControlAdapter() {
            public void itemEntered(VisualItem item, MouseEvent e) {
                if ( item.canGetString(label) )
                    title.setText(item.getString(label));
            }
            public void itemExited(VisualItem item, MouseEvent e) {
                title.setText(null);
            }
        });

        Box box = new Box(BoxLayout.X_AXIS);
        box.add(Box.createHorizontalStrut(10));
        box.add(title);
        box.add(Box.createHorizontalGlue());
        box.add(search);
        box.add(Box.createHorizontalStrut(3));
        box.setBackground(BACKGROUND);

        JPanel panel = new JPanel(new BorderLayout());
        panel.setBackground(BACKGROUND);
        panel.setForeground(FOREGROUND);
        panel.add(tview, BorderLayout.CENTER);
        panel.add(box, BorderLayout.SOUTH);
        return panel;
    }

    public class OrientAction extends AbstractAction {//方向Action，针对界面中变换布局方式所做的响应
        private int orientation;

        public OrientAction(int orientation) {
            this.orientation = orientation;
        }
        public void actionPerformed(ActionEvent evt) {
            setOrientation(orientation);
            getVisualization().cancel("orient");
            getVisualization().run("treeLayout");
            getVisualization().run("orient");//通过进入getVisualization方法可以发现该方法返回的是m_vis对象，getVisualization().run("orient");等价于m_vis.run("orient");
        }
    }

    public class AutoPanAction extends Action {
        private Point2D m_start = new Point2D.Double();
        private Point2D m_end   = new Point2D.Double();
        private Point2D m_cur   = new Point2D.Double();
        private int     m_bias  = 150;

        public void run(double frac) {
            TupleSet ts = m_vis.getFocusGroup(Visualization.FOCUS_ITEMS);
            if ( ts.getTupleCount() == 0 )
                return;

            if ( frac == 0.0 ) {
                int xbias=0, ybias=0;
                switch ( m_orientation ) {
                case Constants.ORIENT_LEFT_RIGHT:
                    xbias = m_bias;
                    break;
                case Constants.ORIENT_RIGHT_LEFT:
                    xbias = -m_bias;
                    break;
                case Constants.ORIENT_TOP_BOTTOM:
                    ybias = m_bias;
                    break;
                case Constants.ORIENT_BOTTOM_TOP:
                    ybias = -m_bias;
                    break;
                }

                VisualItem vi = (VisualItem)ts.tuples().next();
                m_cur.setLocation(getWidth()/2, getHeight()/2);
                getAbsoluteCoordinate(m_cur, m_start);
                m_end.setLocation(vi.getX()+xbias, vi.getY()+ybias);
            } else {
                m_cur.setLocation(m_start.getX() + frac*(m_end.getX()-m_start.getX()),
                                  m_start.getY() + frac*(m_end.getY()-m_start.getY()));
                panToAbs(m_cur);
            }
        }
    }

    public static class NodeColorAction extends ColorAction {

        public NodeColorAction(String group) {
            super(group, VisualItem.FILLCOLOR);
        }

        public int getColor(VisualItem item) {
            if ( m_vis.isInGroup(item, Visualization.SEARCH_ITEMS) )
                return ColorLib.rgb(255,190,190);
            else if ( m_vis.isInGroup(item, Visualization.FOCUS_ITEMS) )
                return ColorLib.rgb(198,229,229);
            else if ( item.getDOI() > -1 )
                return ColorLib.rgb(164,193,193);
            else
                return ColorLib.rgba(255,255,255,0);
        }

    } // end of inner class TreeMapColorAction

} // end of class TreeMap

原文链接：http://www.cnblogs.com/bigdataZJ/p/VisualizationPrefuse2.html

画外音：1.prefuse真的很全面、很强大，不知道为什么后面一直没有更新，是转为商业化运营了么？？？

　　　　2.感觉研究可视化的小伙伴不是很多啊。。。

友情赞助

如果你觉得博主的文章对你那么一点小帮助，恰巧你又有想打赏博主的小冲动，那么事不宜迟，赶紧扫一扫，小额地赞助下，攒个奶粉钱，也是让博主有动力继续努力，写出更好的文章^^。

　　　　1. 支付宝　　　　　　　　　　　　　　　　　　　　　　　　　　2. 微信