Java tutorial
/* * Copyright (c) 2003, the JUNG Project and the Regents of the University of * California All rights reserved. * * This software is open-source under the BSD license; see either "license.txt" * or http://jung.sourceforge.net/license.txt for a description. * */ package jgraph; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.Graphics2D; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.image.BufferedImage; import java.awt.print.Printable; import java.awt.print.PrinterJob; import java.io.File; import java.util.HashMap; import javax.imageio.ImageIO; import javax.swing.AbstractAction; import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JPopupMenu; import org.apache.commons.collections15.Factory; import org.apache.commons.collections15.functors.MapTransformer; import org.apache.commons.collections15.map.LazyMap; import edu.uci.ics.jung.algorithms.layout.AbstractLayout; //import edu.uci.ics.jung.algorithms.layout.StaticLayout; import edu.uci.ics.jung.algorithms.layout.CircleLayout; import edu.uci.ics.jung.graph.Graph; import edu.uci.ics.jung.graph.DirectedOrderedSparseMultigraph; import edu.uci.ics.jung.visualization.GraphZoomScrollPane; import edu.uci.ics.jung.visualization.VisualizationViewer; import edu.uci.ics.jung.visualization.annotations.AnnotationControls; import edu.uci.ics.jung.visualization.control.*; import edu.uci.ics.jung.visualization.decorators.ToStringLabeller; /** * Shows how to create a graph editor with JUNG. * Mouse modes and actions are explained in the help text. * The application version of JShow provides a * File menu with an option to save the visible graph as * a jpeg file. * * @author Tom Nelson * changes -- Paul Tarau, April 2011 */ public class JShow extends JApplet implements Printable { /** * */ private static final long serialVersionUID = 220L; /** * the graph */ Graph<Object, Object> graph; AbstractLayout<Object, Object> layout; /** * the visual component and renderer for the graph */ VisualizationViewer<Object, Object> vv; String instructions = "<html>" + "<h3>Picking Mode:</h3>" + "<ul>" + "<li>Mouse1 on a Vertex selects the vertex" + "<li>Mouse1 elsewhere unselects all Vertices" + "<li>Mouse1+Shift on a Vertex adds/removes Vertex selection" + "<li>Mouse1+drag on a Vertex moves all selected Vertices" + "<li>Mouse1+drag elsewhere selects Vertices in a region" + "<li>Mouse1+Shift+drag adds selection of Vertices in a new region" + "<li>Mouse1+CTRL on a Vertex selects the vertex and centers the display on it" + "</ul>" + "<h3>Transforming Mode:</h3>" + "<ul>" + "<li>Mouse1+drag pans the graph" + "<li>Mouse1+Shift+drag rotates the graph" + "<li>Mouse1+CTRL(or Command)+drag shears the graph" + "<li>Mouse1 double-click on a vertex or edge allows you to edit the label" + "</html>"; /** * create an instance of a simple graph with popup controls to * create a graph. * */ public JShow(DirectedOrderedSparseMultigraph<Object, Object> graph) { this.graph = graph; this.layout = new CircleLayout(graph); layout.setSize(new Dimension(600, 600)); vv = new VisualizationViewer<Object, Object>(layout); vv.setBackground(Color.white); vv.getRenderContext().setVertexLabelTransformer(MapTransformer.<Object, String>getInstance( LazyMap.<Object, String>decorate(new HashMap<Object, String>(), new ToStringLabeller<Object>()))); vv.getRenderContext().setEdgeLabelTransformer(MapTransformer.<Object, String>getInstance( LazyMap.<Object, String>decorate(new HashMap<Object, String>(), new ToStringLabeller<Object>()))); vv.setVertexToolTipTransformer(vv.getRenderContext().getVertexLabelTransformer()); Container content = getContentPane(); final GraphZoomScrollPane panel = new GraphZoomScrollPane(vv); content.add(panel); final DefaultModalGraphMouse graphMouse = new DefaultModalGraphMouse(); vv.setGraphMouse(graphMouse); vv.setGraphMouse(graphMouse); vv.addKeyListener(graphMouse.getModeKeyListener()); graphMouse.setMode(ModalGraphMouse.Mode.EDITING); 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()); } }); JButton help = new JButton("Help"); help.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { JOptionPane.showMessageDialog(vv, instructions); } }); JPanel controls = new JPanel(); controls.add(plus); controls.add(minus); JComboBox modeBox = graphMouse.getModeComboBox(); controls.add(modeBox); controls.add(help); content.add(controls, BorderLayout.SOUTH); } /** * copy the visible part of the graph to a file as a jpeg image * @param file */ public void writeJPEGImage(File file) { int width = vv.getWidth(); int height = vv.getHeight(); BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D graphics = bi.createGraphics(); vv.paint(graphics); graphics.dispose(); try { ImageIO.write(bi, "jpeg", file); } catch (Exception e) { e.printStackTrace(); } } public int print(java.awt.Graphics graphics, java.awt.print.PageFormat pageFormat, int pageIndex) throws java.awt.print.PrinterException { if (pageIndex > 0) { return (Printable.NO_SUCH_PAGE); } else { java.awt.Graphics2D g2d = (java.awt.Graphics2D) graphics; vv.setDoubleBuffered(false); g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY()); vv.paint(g2d); vv.setDoubleBuffered(true); return (Printable.PAGE_EXISTS); } } /** * a driver for this demo */ @SuppressWarnings("serial") public static void showtest(DirectedOrderedSparseMultigraph<Object, Object> graph) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); final JShow demo = new JShow(graph); JMenu menu = new JMenu("Snapshot"); menu.add(new AbstractAction("To JPEG") { public void actionPerformed(ActionEvent e) { JFileChooser chooser = new JFileChooser(); int option = chooser.showSaveDialog(demo); if (option == JFileChooser.APPROVE_OPTION) { File file = chooser.getSelectedFile(); demo.writeJPEGImage(file); } } }); menu.add(new AbstractAction("Print") { public void actionPerformed(ActionEvent e) { PrinterJob printJob = PrinterJob.getPrinterJob(); printJob.setPrintable(demo); if (printJob.printDialog()) { try { printJob.print(); } catch (Exception ex) { ex.printStackTrace(); } } } }); JPopupMenu.setDefaultLightWeightPopupEnabled(false); JMenuBar menuBar = new JMenuBar(); menuBar.add(menu); frame.setJMenuBar(menuBar); frame.getContentPane().add(demo); frame.pack(); frame.setVisible(true); } }