• 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
    View Code

    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
    View Code

    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。。。

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  • 原文地址:https://www.cnblogs.com/bigdataZJ/p/VisualizationPrefuse2.html
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