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. * */ import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.geom.AffineTransform; import java.awt.geom.Point2D; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.swing.ImageIcon; import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import org.apache.commons.collections15.Transformer; import org.apache.commons.collections15.functors.ChainedTransformer; import edu.uci.ics.jung.algorithms.layout.Layout; import edu.uci.ics.jung.algorithms.layout.StaticLayout; import edu.uci.ics.jung.graph.DirectedSparseMultigraph; import edu.uci.ics.jung.graph.Graph; import edu.uci.ics.jung.graph.util.EdgeType; import edu.uci.ics.jung.visualization.GraphZoomScrollPane; import edu.uci.ics.jung.visualization.Layer; import edu.uci.ics.jung.visualization.VisualizationViewer; import edu.uci.ics.jung.visualization.control.AbstractModalGraphMouse; import edu.uci.ics.jung.visualization.control.CrossoverScalingControl; import edu.uci.ics.jung.visualization.control.DefaultModalGraphMouse; import edu.uci.ics.jung.visualization.control.ScalingControl; import edu.uci.ics.jung.visualization.decorators.ToStringLabeller; import edu.uci.ics.jung.visualization.renderers.GradientVertexRenderer; import edu.uci.ics.jung.visualization.renderers.Renderer; import edu.uci.ics.jung.visualization.renderers.BasicVertexLabelRenderer.InsidePositioner; /** * Shows a graph overlaid on a world map image. * Scaling of the graph also scales the image background. * @author Tom Nelson * */ @SuppressWarnings("serial") public class WorldMapGraphDemo extends JApplet { /** * the graph */ Graph<String, Number> graph; /** * the visual component and renderer for the graph */ VisualizationViewer<String, Number> vv; Map<String, String[]> map = new HashMap<String, String[]>(); List<String> cityList; /** * create an instance of a simple graph with controls to * demo the zoom features. * */ public WorldMapGraphDemo() { setLayout(new BorderLayout()); map.put("TYO", new String[] { "35 40 N", "139 45 E" }); map.put("PEK", new String[] { "39 55 N", "116 26 E" }); map.put("MOW", new String[] { "55 45 N", "37 42 E" }); map.put("JRS", new String[] { "31 47 N", "35 13 E" }); map.put("CAI", new String[] { "30 03 N", "31 15 E" }); map.put("CPT", new String[] { "33 55 S", "18 22 E" }); map.put("PAR", new String[] { "48 52 N", "2 20 E" }); map.put("LHR", new String[] { "51 30 N", "0 10 W" }); map.put("HNL", new String[] { "21 18 N", "157 51 W" }); map.put("NYC", new String[] { "40 77 N", "73 98 W" }); map.put("SFO", new String[] { "37 62 N", "122 38 W" }); map.put("AKL", new String[] { "36 55 S", "174 47 E" }); map.put("BNE", new String[] { "27 28 S", "153 02 E" }); map.put("HKG", new String[] { "22 15 N", "114 10 E" }); map.put("KTM", new String[] { "27 42 N", "85 19 E" }); map.put("IST", new String[] { "41 01 N", "28 58 E" }); map.put("STO", new String[] { "59 20 N", "18 03 E" }); map.put("RIO", new String[] { "22 54 S", "43 14 W" }); map.put("LIM", new String[] { "12 03 S", "77 03 W" }); map.put("YTO", new String[] { "43 39 N", "79 23 W" }); cityList = new ArrayList<String>(map.keySet()); // create a simple graph for the demo graph = new DirectedSparseMultigraph<String, Number>(); createVertices(); createEdges(); ImageIcon mapIcon = null; String imageLocation = "/images/political_world_map.jpg"; try { mapIcon = new ImageIcon(getClass().getResource(imageLocation)); } catch (Exception ex) { System.err.println("Can't load \"" + imageLocation + "\""); } final ImageIcon icon = mapIcon; Dimension layoutSize = new Dimension(2000, 1000); Layout<String, Number> layout = new StaticLayout<String, Number>(graph, new ChainedTransformer(new Transformer[] { new CityTransformer(map), new LatLonPixelTransformer(new Dimension(2000, 1000)) })); layout.setSize(layoutSize); vv = new VisualizationViewer<String, Number>(layout, new Dimension(800, 400)); if (icon != null) { vv.addPreRenderPaintable(new VisualizationViewer.Paintable() { public void paint(Graphics g) { Graphics2D g2d = (Graphics2D) g; AffineTransform oldXform = g2d.getTransform(); AffineTransform lat = vv.getRenderContext().getMultiLayerTransformer() .getTransformer(Layer.LAYOUT).getTransform(); AffineTransform vat = vv.getRenderContext().getMultiLayerTransformer() .getTransformer(Layer.VIEW).getTransform(); AffineTransform at = new AffineTransform(); at.concatenate(g2d.getTransform()); at.concatenate(vat); at.concatenate(lat); g2d.setTransform(at); g.drawImage(icon.getImage(), 0, 0, icon.getIconWidth(), icon.getIconHeight(), vv); g2d.setTransform(oldXform); } public boolean useTransform() { return false; } }); } vv.getRenderer().setVertexRenderer(new GradientVertexRenderer<String, Number>(Color.white, Color.red, Color.white, Color.blue, vv.getPickedVertexState(), false)); // add my listeners for ToolTips vv.setVertexToolTipTransformer(new ToStringLabeller()); vv.setEdgeToolTipTransformer(new Transformer<Number, String>() { public String transform(Number edge) { return "E" + graph.getEndpoints(edge).toString(); } }); vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller()); vv.getRenderer().getVertexLabelRenderer().setPositioner(new InsidePositioner()); vv.getRenderer().getVertexLabelRenderer().setPosition(Renderer.VertexLabel.Position.AUTO); final GraphZoomScrollPane panel = new GraphZoomScrollPane(vv); add(panel); final AbstractModalGraphMouse graphMouse = new DefaultModalGraphMouse(); vv.setGraphMouse(graphMouse); vv.addKeyListener(graphMouse.getModeKeyListener()); vv.setToolTipText("<html><center>Type 'p' for Pick mode<p>Type 't' for Transform mode"); final ScalingControl scaler = new CrossoverScalingControl(); // vv.scaleToLayout(scaler); 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 reset = new JButton("reset"); reset.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT).setToIdentity(); vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW).setToIdentity(); } }); JPanel controls = new JPanel(); controls.add(plus); controls.add(minus); controls.add(reset); add(controls, BorderLayout.SOUTH); } /** * create some vertices * @param count how many to create * @return the Vertices in an array */ private void createVertices() { for (String city : map.keySet()) { graph.addVertex(city); } } /** * create edges for this demo graph * @param v an array of Vertices to connect */ void createEdges() { for (int i = 0; i < map.keySet().size() * 1.3; i++) { graph.addEdge(new Double(Math.random()), randomCity(), randomCity(), EdgeType.DIRECTED); } } private String randomCity() { int m = cityList.size(); return cityList.get((int) (Math.random() * m)); } static class CityTransformer implements Transformer<String, String[]> { Map<String, String[]> map; public CityTransformer(Map<String, String[]> map) { this.map = map; } /** * transform airport code to latlon string */ public String[] transform(String city) { return map.get(city); } } static class LatLonPixelTransformer implements Transformer<String[], Point2D> { Dimension d; int startOffset; public LatLonPixelTransformer(Dimension d) { this.d = d; } /** * transform a lat */ public Point2D transform(String[] latlon) { double latitude = 0; double longitude = 0; String[] lat = latlon[0].split(" "); String[] lon = latlon[1].split(" "); latitude = Integer.parseInt(lat[0]) + Integer.parseInt(lat[1]) / 60f; latitude *= d.height / 180f; longitude = Integer.parseInt(lon[0]) + Integer.parseInt(lon[1]) / 60f; longitude *= d.width / 360f; if (lat[2].equals("N")) { latitude = d.height / 2 - latitude; } else { // assume S latitude = d.height / 2 + latitude; } if (lon[2].equals("W")) { longitude = d.width / 2 - longitude; } else { // assume E longitude = d.width / 2 + longitude; } return new Point2D.Double(longitude, latitude); } } /** * a driver for this demo */ public static void main(String[] args) { // create a frome to hold the graph final JFrame frame = new JFrame(); Container content = frame.getContentPane(); content.add(new WorldMapGraphDemo()); frame.pack(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }