我正在开发一个程序，该程序读取一些 xml 文件并根据这些 xml 文件中的信息创建图表。
我在制作图表时遇到了困难。我希望我的图表看起来: http://pic.dhe.ibm.com/infocenter/elixent/v3r5/topic/com.ibm.ilog.elixir.doc/Content/Visualization/Documentation/Flex/Diagram4Flex/_media/TreeLayoutExample_default.png
所以，我希望它有一个树状布局，顶点的名称在一些彩色矩形内(pref 对不同种类的项目有不同的颜色)，我还想在两个顶点之间的边缘上写一些东西。最重要的是，我非常希望顶点是我在我的项目中创建的一些对象，因此当我单击一个顶点以获取放置在顶点上的对象的实例时。
到目前为止，我尝试了两个框架来轻松绘制我的图形，而无需在绘制算法上做太多工作:
起初我尝试了 jgraph 框架:
package mainPack;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JApplet;
import javax.swing.JFrame;
import org.jgraph.JGraph;
import org.jgraph.graph.DefaultGraphCell;
import org.jgraph.graph.GraphConstants;
import org.jgrapht.ListenableGraph;
import org.jgrapht.ext.JGraphModelAdapter;
import org.jgrapht.graph.ListenableDirectedGraph;
import org.jgrapht.graph.DefaultEdge;
import org.jgrapht.graph.ListenableDirectedWeightedGraph;
/**
* A demo applet that shows how to use JGraph to visualize JGraphT graphs.
*
* @author Barak Naveh
*
* @since Aug 3, 2003
*/
public class Test extends JApplet {
private static final Color DEFAULT_BG_COLOR = Color.decode( "#FAFBFF" );
private static final Dimension DEFAULT_SIZE = new Dimension( 530, 320 );
//
private JGraphModelAdapter m_jgAdapter;
/**
* @see java.applet.Applet#init().
*/
public void init( ) {
// create a JGraphT graph
ListenableGraph g = new ListenableDirectedGraph( DefaultEdge.class );
// create a visualization using JGraph, via an adapter
m_jgAdapter = new JGraphModelAdapter( g );
JGraph jgraph = new JGraph( m_jgAdapter );
adjustDisplaySettings( jgraph );
getContentPane( ).add( jgraph );
resize( DEFAULT_SIZE );
// add some sample data (graph manipulated via JGraphT)
g.addVertex( "v1" );
g.addVertex( "v2" );
g.addVertex( "v3" );
g.addVertex( "v4" );
g.addEdge( "v1", "v2", "1" );
g.addEdge( "v2", "v3", "2" );
g.addEdge( "v3", "v1", "3" );
g.addEdge( "v4", "v3", "4" );
// position vertices nicely within JGraph component
positionVertexAt( "v1", 130, 40 );
positionVertexAt( "v2", 60, 200 );
positionVertexAt( "v3", 310, 230 );
positionVertexAt( "v4", 380, 70 );
// that's all there is to it!...
}
private void adjustDisplaySettings( JGraph jg ) {
jg.setPreferredSize( DEFAULT_SIZE );
Color c = DEFAULT_BG_COLOR;
String colorStr = null;
try {
colorStr = getParameter( "bgcolor" );
}
catch( Exception e ) {}
if( colorStr != null ) {
c = Color.decode( colorStr );
}
jg.setBackground( c );
}
private void positionVertexAt( Object vertex, int x, int y ) {
DefaultGraphCell cell = m_jgAdapter.getVertexCell( vertex );
Map attr = cell.getAttributes();
// Rectangle b = new Rectangle((int)(Math.random()*1000),(int)(Math.random()*500),100,30);
Rectangle b = new Rectangle(20,50 ,100,30);
GraphConstants.setBounds( attr, b );
Map cellAttr = new HashMap( );
cellAttr.put( cell, attr );
m_jgAdapter.edit( cellAttr, null, null, null );
}
这个框架在制作图形时效果很好，矩形内有顶点名称，边上有名称，并且可以在使用 MouseListener 单击顶点时获取顶点内的字符串。
但我无法找到一种方法使其具有 TreeLayout 并添加顶点作为某些对象，当单击 Vertex 时我可能会返回这些对象。我尝试使用此示例中的通用类，但在尝试运行它时仅出现异常。我在 Internet 上搜索但找不到在此图上应用树布局的方法
我也尝试过 Java JUNG Framework，它有更多的绘图选项。我找到了这个例子:
@SuppressWarnings("serial")
public class TreeLayoutDemo extends JApplet {
/**
* the graph
*/
Forest<String,Integer> graph;
Factory<DirectedGraph<String,Integer>> graphFactory =
new Factory<DirectedGraph<String,Integer>>() {
public DirectedGraph<String, Integer> create() {
return new DirectedSparseMultigraph<String,Integer>();
}
};
Factory<Tree<String,Integer>> treeFactory =
new Factory<Tree<String,Integer>> () {
public Tree<String, Integer> create() {
return new DelegateTree<String,Integer>(graphFactory);
}
};
Factory<Integer> edgeFactory = new Factory<Integer>() {
int i=0;
public Integer create() {
return i++;
}};
Factory<String> vertexFactory = new Factory<String>() {
int i=0;
public String create() {
return "V"+i++;
}};
/**
* the visual component and renderer for the graph
*/
VisualizationViewer<String,Integer> vv;
VisualizationServer.Paintable rings;
String root;
TreeLayout<String,Integer> treeLayout;
RadialTreeLayout<String,Integer> radialLayout;
public TreeLayoutDemo() {
// create a simple graph for the demo
graph = new DelegateForest<String,Integer>();
createTree();
treeLayout = new TreeLayout<String,Integer>(graph);
radialLayout = new RadialTreeLayout<String,Integer>(graph);
radialLayout.setSize(new Dimension(600,600));
vv = new VisualizationViewer<String,Integer>(treeLayout, new Dimension(600,600));
vv.setBackground(Color.white);
vv.getRenderContext().setEdgeShapeTransformer(new EdgeShape.Line());
vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
// vv.getRenderContext().setVertexShapeTransformer(arg0);
// add a listener for ToolTips
vv.setVertexToolTipTransformer(new ToStringLabeller());
vv.getRenderContext().setArrowFillPaintTransformer(new ConstantTransformer(Color.lightGray));
rings = new Rings();
Container content = getContentPane();
final GraphZoomScrollPane panel = new GraphZoomScrollPane(vv);
content.add(panel);
final DefaultModalGraphMouse graphMouse = new DefaultModalGraphMouse();
vv.setGraphMouse(graphMouse);
JComboBox modeBox = graphMouse.getModeComboBox();
modeBox.addItemListener(graphMouse.getModeListener());
graphMouse.setMode(ModalGraphMouse.Mode.TRANSFORMING);
final ScalingControl scaler = new CrossoverScalingControl();
JButton plus = new JButton("+");
plus.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
scaler.scale(vv, 1.1f, vv.getCenter());
}
});
JButton minus = new JButton("-");
minus.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
scaler.scale(vv, 1/1.1f, vv.getCenter());
}
});
JToggleButton radial = new JToggleButton("Radial");
radial.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange() == ItemEvent.SELECTED) {
LayoutTransition<String,Integer> lt =
new LayoutTransition<String,Integer>(vv, treeLayout, radialLayout);
Animator animator = new Animator(lt);
animator.start();
vv.getRenderContext().getMultiLayerTransformer().setToIdentity();
vv.addPreRenderPaintable(rings);
} else {
LayoutTransition<String,Integer> lt =
new LayoutTransition<String,Integer>(vv, radialLayout, treeLayout);
Animator animator = new Animator(lt);
animator.start();
vv.getRenderContext().getMultiLayerTransformer().setToIdentity();
vv.removePreRenderPaintable(rings);
}
vv.repaint();
}});
JPanel scaleGrid = new JPanel(new GridLayout(1,0));
scaleGrid.setBorder(BorderFactory.createTitledBorder("Zoom"));
JPanel controls = new JPanel();
scaleGrid.add(plus);
scaleGrid.add(minus);
controls.add(radial);
controls.add(scaleGrid);
controls.add(modeBox);
content.add(controls, BorderLayout.SOUTH);
}
class Rings implements VisualizationServer.Paintable {
Collection<Double> depths;
public Rings() {
depths = getDepths();
}
private Collection<Double> getDepths() {
Set<Double> depths = new HashSet<Double>();
Map<String,PolarPoint> polarLocations = radialLayout.getPolarLocations();
for(String v : graph.getVertices()) {
PolarPoint pp = polarLocations.get(v);
depths.add(pp.getRadius());
}
return depths;
}
public void paint(Graphics g) {
g.setColor(Color.lightGray);
Graphics2D g2d = (Graphics2D)g;
Point2D center = radialLayout.getCenter();
Rectangle2D rectangle = new Rectangle2D.Double(); // (center.getX()-10, center.getY()-20, 20, 40);
Ellipse2D ellipse = new Ellipse2D.Double();
for(double d : depths) {
ellipse.setFrameFromDiagonal(center.getX()-d, center.getY()-d,
center.getX()+d, center.getY()+d);
rectangle.setFrameFromDiagonal(center.getX()-d, center.getY()-d,
center.getX()+d, center.getY()+d);
Shape shape = vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT).transform(rectangle);
g2d.draw(shape);
}
}
public boolean useTransform() {
return true;
}
}
/**
*
*/
private void createTree() {
graph.addVertex("V0");
graph.addEdge(edgeFactory.create(), "V0", "V1");
graph.addEdge(edgeFactory.create(), "V0", "V2");
graph.addEdge(edgeFactory.create(), "V1", "V4");
graph.addEdge(edgeFactory.create(), "V2", "V3");
graph.addEdge(edgeFactory.create(), "V2", "V5");
graph.addEdge(edgeFactory.create(), "V4", "V6");
graph.addEdge(edgeFactory.create(), "V4", "V7");
graph.addEdge(edgeFactory.create(), "V3", "V8");
graph.addEdge(edgeFactory.create(), "V6", "V9");
graph.addEdge(edgeFactory.create(), "V4", "V10");
graph.addVertex("A0");
graph.addEdge(edgeFactory.create(), "A0", "A1");
graph.addEdge(edgeFactory.create(), "A0", "A2");
graph.addEdge(edgeFactory.create(), "A0", "A3");
graph.addVertex("B0");
graph.addEdge(edgeFactory.create(), "B0", "B1");
graph.addEdge(edgeFactory.create(), "B0", "B2");
graph.addEdge(edgeFactory.create(), "B1", "B4");
graph.addEdge(edgeFactory.create(), "B2", "B3");
graph.addEdge(edgeFactory.create(), "B2", "B5");
graph.addEdge(edgeFactory.create(), "B4", "B6");
graph.addEdge(edgeFactory.create(), "B4", "B7");
graph.addEdge(edgeFactory.create(), "B3", "B8");
graph.addEdge(edgeFactory.create(), "B6", "B9");
}
/**
* a driver for this demo
*/
public static void main(String[] args) {
JFrame frame = new JFrame();
Container content = frame.getContentPane();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
content.add(new TreeLayoutDemo());
frame.pack();
frame.setVisible(true);
}
使用此框架，我可以将顶点添加为我创建的一些对象，并在顶点名称上显示该对象在 toString() 方法中返回的内容。它还具有我非常想要的 TreeLayout 算法，实现了但我无法设法改变顶点的外观。我希望它们看起来像 JGraph 框架绘制的顶点，但是使用 JUNG 我只得到一些圆圈并且顶点名称在顶点形状之外。我发现了一个改变顶点形状的例子，但文字仍然在外面。
所以，我非常想要一些关于如何绘制介于这两个框架之间的图形的建议:在形状中具有顶点名称，具有 Treelayout 并添加顶点作为一些对象我可以在点击顶点时返回。
Marco13 的回答非常有用。我想通过为矩形的宽度设置 String.length * 10 来使矩形的大小适合他的字符串。
我认为这可能对尝试制作如下图的其他人有用:在本示例中，可以使用任何需要的对象，而不是出现在大多数通用类中的那个，字符串用于顶点，整数用于边类型。在 Transformer 函数中，您可以获得分配给顶点或边的对象。像这样，我可以为具有某些特定属性的对象设置不同的形状、颜色和字体。
我正在研究如何制作一个 MouseListener，当我点击它时它会返回边缘对象，但我希望这会很容易。
最佳答案
您可以像这样在第二个示例中配置 VisualizationViewer:
vv.getRenderContext().setVertexShapeTransformer(new Transformer<String, Shape>()
{
@Override
public Shape transform(String vertex)
{
return new Rectangle2D.Double(-10,-10,40,20);
}
});
BasicVertexLabelRenderer<String, Integer> vertexLabelRenderer =
new BasicVertexLabelRenderer<String, Integer>();
vertexLabelRenderer.setPosition( Renderer.VertexLabel.Position.CNTR);
vv.getRenderer().setVertexLabelRenderer(vertexLabelRenderer);
这会将顶点渲染为矩形，并将标签放在中心。扩展(如调整内容的矩形大小)可能有点繁琐，但应该是可行的。
关于java - 如何在 Java 中制作 Treelayout 图，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22809489/