import prefuse.controls.FocusControl; //导入依赖的package包/类
StackedGraphDisplay()
{
    super( new Visualization() );

    setBackground( ColorLib.getColor( 0, 51, 88 ) );

    LabelRenderer labelRenderer = new LabelRenderer( NAME_LABEL );
    labelRenderer.setVerticalAlignment( Constants.BOTTOM );
    labelRenderer.setHorizontalAlignment( Constants.LEFT );

    EdgeRenderer usesRenderer = new EdgeRenderer( Constants.EDGE_TYPE_CURVE, Constants.EDGE_ARROW_FORWARD );
    usesRenderer.setHorizontalAlignment1( Constants.CENTER );
    usesRenderer.setHorizontalAlignment2( Constants.CENTER );
    usesRenderer.setVerticalAlignment1( Constants.BOTTOM );
    usesRenderer.setVerticalAlignment2( Constants.TOP );

    Predicate usesPredicate = (Predicate) ExpressionParser.parse( "ingroup('graph.edges') AND [" + USES_EDGES + "]==true", true );

    // set up the renderers - one for nodes and one for LABELS
    DefaultRendererFactory rf = new DefaultRendererFactory();
    rf.add( new InGroupPredicate( GRAPH_NODES ), new NodeRenderer() );
    rf.add( new InGroupPredicate( LABELS ), labelRenderer );
    rf.add( usesPredicate, usesRenderer );
    m_vis.setRendererFactory( rf );

    // border colors
    ColorAction borderColor = new BorderColorAction( GRAPH_NODES );
    ColorAction fillColor = new FillColorAction( GRAPH_NODES );

    // uses edge colors
    ItemAction usesColor = new ColorAction( GRAPH_EDGES, usesPredicate, VisualItem.STROKECOLOR, ColorLib.rgb( 50, 50, 50 ) );
    ItemAction usesArrow = new ColorAction( GRAPH_EDGES, usesPredicate, VisualItem.FILLCOLOR, ColorLib.rgb( 50, 50, 50 ) );

    // color settings
    ActionList colors = new ActionList();
    colors.add( fillColor );
    colors.add( borderColor );
    colors.add( usesColor );
    colors.add( usesArrow );
    m_vis.putAction( COLORS_ACTION, colors );

    ActionList autoPan = new ActionList();
    autoPan.add( colors );
    autoPan.add( new AutoPanAction() );
    autoPan.add( new RepaintAction() );
    m_vis.putAction( AUTO_PAN_ACTION, autoPan );

    // create the layout action list
    stackedLayout = new StackedLayout( GRAPH );
    ActionList layout = new ActionList();
    layout.add( stackedLayout );
    layout.add( new LabelLayout( LABELS ) );
    layout.add( autoPan );
    m_vis.putAction( LAYOUT_ACTION, layout );

    // initialize our display
    Dimension size = new Dimension( 400, 400 );
    setSize( size );
    setPreferredSize( size );
    setItemSorter( new ExtendedTreeDepthItemSorter( true ) );
    addControlListener( new HoverControl() );
    addControlListener( new FocusControl( 1, COLORS_ACTION ) );
    addControlListener( new WheelMouseControl() );
    addControlListener( new PanControl( true ) );
    addControlListener( new ItemSelectionControl() );

    setDamageRedraw( true );
}