JGraph 画出你想要的图形

最近在学着使用开源的JGraph，为了能添加一个自己的cell，看了一堆帖子。这些帖子有一个特点，千篇一律，你转我的，我转你的，感觉太没意思了吧，始终只能画出锥形。后来还是直接搜索英文的了，搜到了The JGraph Tutorial。其中给了一个很好的例子，我略作了一些修改，功能是添加了一个自己的EllipseCell，画出了椭圆或者圆，这个取决于代码中的GraphConstants.setBounds(cells[1].getAttributes(),

new Rectangle2D.Double(140,140,40,20))。（代码中没有进行注释，想进一步了解的可以下载英

文手册进行学习，这里给出一个我上传的网址 http://download.csdn.net/source/2742630，同时记得下载jar包，否则无法运行）：

 

 JGtest.java文件内容如下：

   

import java.awt.Color;

import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import org.jgraph.JGraph;
import org.jgraph.graph.CellViewRenderer;
import org.jgraph.graph.DefaultCellViewFactory;
import org.jgraph.graph.DefaultEdge;
import org.jgraph.graph.DefaultGraphCell;
import org.jgraph.graph.DefaultGraphModel;
import org.jgraph.graph.DefaultPort;
import org.jgraph.graph.EdgeView;
import org.jgraph.graph.GraphConstants;
import org.jgraph.graph.GraphLayoutCache;
import org.jgraph.graph.GraphModel;
import org.jgraph.graph.VertexRenderer;
import org.jgraph.graph.VertexView;

public class JGtest {
    public static void main(String[] args)
      {
        GraphModel model = new DefaultGraphModel();
        GraphLayoutCache view = new GraphLayoutCache(model, new MyView());
        JGraph graph = new JGraph(model, view);

        DefaultGraphCell[] cells = new DefaultGraphCell[3];
            cells[0] = new EllipseCell(new String("Hello New"));
        //GraphConstants.setAutoSize(cells[0].getAttributes(), true);
        GraphConstants.setBounds(cells[0].getAttributes(), new Rectangle2D.Double(140,20,50,50));
        GraphConstants.setGradientColor(cells[0].getAttributes(),Color.black);
        GraphConstants.setOpaque(cells[0].getAttributes(), true);

        DefaultPort port0 = new DefaultPort();
         cells[0].add(port0);
             cells[1] = new DefaultGraphCell(new String("World"));
        GraphConstants.setBounds(cells[1].getAttributes(), new Rectangle2D.Double(140,140,40,20));
        GraphConstants.setGradientColor(cells[1].getAttributes(),Color.red);
        GraphConstants.setOpaque(cells[1].getAttributes(), true);
        DefaultPort port1 = new DefaultPort();
        cells[1].add(port1);

        DefaultEdge edge = new DefaultEdge();
        edge.setSource(cells[0].getChildAt(0));
        edge.setTarget(cells[1].getChildAt(0));
        cells[2] = edge;
        int arrow = GraphConstants.ARROW_CLASSIC;
        GraphConstants.setLineEnd(edge.getAttributes(), arrow);
        GraphConstants.setEndFill(edge.getAttributes(), true);
         graph.getGraphLayoutCache().insert(cells);

           JFrame frame = new JFrame();
        frame.setSize(1000, 500);
        frame.setTitle("Activity Diagram");
        frame.getContentPane().add(new JScrollPane(graph));

         frame.setBounds(50, 50, 700, 800);

         frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
         frame.setVisible(true);

        }

}

 

  EllipseCell.java文件内容：

 

 

import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;

import org.jgraph.graph.CellViewRenderer;
import org.jgraph.graph.DefaultCellViewFactory;
import org.jgraph.graph.DefaultGraphCell;
import org.jgraph.graph.EdgeView;
import org.jgraph.graph.VertexRenderer;
import org.jgraph.graph.VertexView;



//Define EllipseCell
public class EllipseCell extends DefaultGraphCell {
  // Empty Constructor
    public EllipseCell() {
      this(null);
    }
  // Construct Cell for Userobject
    public EllipseCell(Object userObject) {
    super(userObject);
     }
}

//Define the View for an EllipseCell
class EllipseView extends VertexView {

   static EllipseRenderer renderer = new EllipseRenderer();
 // Constructor for Superclass
   public EllipseView(Object cell) {
   super(cell);
 }
 // Returns Perimeter Point for Ellipses
   public Point2D getPerimeterPoint(EdgeView edge, Point2D source, Point2D p) {
        if (getRenderer() instanceof EllipseRenderer)
            return ((EllipseRenderer) getRenderer()).getPerimeterPoint(this,
                    source, p);
        return super.getPerimeterPoint(edge, source, p);
    }

 // Returns the Renderer for this View
   public CellViewRenderer getRenderer() {
   return renderer;
 }
 // Define the Renderer for an EllipseView
   static class EllipseRenderer extends VertexRenderer {
    public void paint(Graphics g) {

       try {
            if (gradientColor != null && !preview && isOpaque()) {
                setOpaque(false);
                Graphics2D g2d = (Graphics2D) g;
                 g2d.setPaint(new GradientPaint(0, 0, getBackground(),
                        getWidth(), getHeight(), gradientColor, true));
                 g2d.drawOval(0, 0, getWidth(), getHeight());
                 g2d.fillOval(0, 0, getWidth(), getHeight());

                 //System.out.println(getWidth()+" "+getHeight());
                //g2d.fillRect(0, 0, getWidth(), getHeight());
            }
            super.paint(g);
            paintSelectionBorder(g);
        } catch (IllegalArgumentException e) {
            // JDK Bug: Zero length string passed to TextLayout constructor
        }
   }
 }
}


class MyView extends DefaultCellViewFactory
{
//  Overrides JGraph.createVertexView
    protected VertexView createVertexView(Object v) {
      // Return an EllipseView for EllipseCells
      if (v instanceof EllipseCell)
        return new EllipseView(v);
      else if(v instanceof DiamondCell)
          return new DiamondView(v);
      // Else Call Superclass
      return super.createVertexView(v);
    }
}

 

由于本人水平有限，目前对这个jar包还在研究中，功能很强大，呵呵。

 

 

http://xdgj.iteye.com/blog/780218