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 Samples.Advanced; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.Paint; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.util.HashMap; import java.util.Map; import javax.swing.BorderFactory; import javax.swing.ButtonGroup; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JPanel; import javax.swing.JRadioButton; import org.apache.commons.collections15.Transformer; import edu.uci.ics.jung.algorithms.layout.FRLayout; import edu.uci.ics.jung.graph.DirectedSparseMultigraph; import edu.uci.ics.jung.graph.util.EdgeType; import edu.uci.ics.jung.visualization.GraphZoomScrollPane; import edu.uci.ics.jung.visualization.LayeredIcon; import edu.uci.ics.jung.visualization.VisualizationServer; import edu.uci.ics.jung.visualization.VisualizationViewer; 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.DefaultVertexIconTransformer; import edu.uci.ics.jung.visualization.decorators.EllipseVertexShapeTransformer; import edu.uci.ics.jung.visualization.decorators.PickableEdgePaintTransformer; import edu.uci.ics.jung.visualization.decorators.PickableVertexPaintTransformer; import edu.uci.ics.jung.visualization.decorators.ToStringLabeller; import edu.uci.ics.jung.visualization.decorators.VertexIconShapeTransformer; import edu.uci.ics.jung.visualization.jai.HyperbolicImageLensSupport; import edu.uci.ics.jung.visualization.picking.PickedState; import edu.uci.ics.jung.visualization.renderers.Checkmark; import edu.uci.ics.jung.visualization.renderers.DefaultEdgeLabelRenderer; import edu.uci.ics.jung.visualization.renderers.DefaultVertexLabelRenderer; import edu.uci.ics.jung.visualization.transform.LayoutLensSupport; import edu.uci.ics.jung.visualization.transform.LensSupport; /** * Demonstrates the use of images to represent graph vertices. * The images are added to the DefaultGraphLabelRenderer and can * either be offset from the vertex, or centered on the vertex. * Additionally, the relative positioning of the label and * image is controlled by subclassing the DefaultGraphLabelRenderer * and setting the appropriate properties on its JLabel superclass * FancyGraphLabelRenderer * * The images used in this demo (courtesy of slashdot.org) are * rectangular but with a transparent background. When vertices * are represented by these images, it looks better if the actual * shape of the opaque part of the image is computed so that the * edge arrowheads follow the visual shape of the image. This demo * uses the FourPassImageShaper class to compute the Shape from * an image with transparent background. * * @author Tom Nelson * */ public class HyperbolicVertexImageShaperDemo extends JApplet { /** * */ private static final long serialVersionUID = 5432239991020505763L; /** * the graph */ DirectedSparseMultigraph<Number, Number> graph; /** * the visual component and renderer for the graph */ VisualizationViewer<Number, Number> vv; /** * some icon names to use */ String[] iconNames = { "apple", "os", "x", "linux", "inputdevices", "wireless", "graphics3", "gamespcgames", "humor", "music", "privacy" }; LensSupport viewSupport; LensSupport modelSupport; /** * create an instance of a simple graph with controls to * demo the zoom features. * */ public HyperbolicVertexImageShaperDemo() { // create a simple graph for the demo graph = new DirectedSparseMultigraph<Number, Number>(); Number[] vertices = createVertices(11); // a Map for the labels Map<Number, String> map = new HashMap<Number, String>(); for (int i = 0; i < vertices.length; i++) { map.put(vertices[i], iconNames[i % iconNames.length]); } // a Map for the Icons Map<Number, Icon> iconMap = new HashMap<Number, Icon>(); for (int i = 0; i < vertices.length; i++) { String name = "/images/topic" + iconNames[i] + ".gif"; try { Icon icon = new LayeredIcon( new ImageIcon(HyperbolicVertexImageShaperDemo.class.getResource(name)).getImage()); iconMap.put(vertices[i], icon); } catch (Exception ex) { System.err.println("You need slashdoticons.jar in your classpath to see the image " + name); } } createEdges(vertices); FRLayout<Number, Number> layout = new FRLayout<Number, Number>(graph); layout.setMaxIterations(100); vv = new VisualizationViewer<Number, Number>(layout, new Dimension(400, 400)); Transformer<Number, Paint> vpf = new PickableVertexPaintTransformer<Number>(vv.getPickedVertexState(), Color.white, Color.yellow); vv.getRenderContext().setVertexFillPaintTransformer(vpf); vv.getRenderContext().setEdgeDrawPaintTransformer( new PickableEdgePaintTransformer<Number>(vv.getPickedEdgeState(), Color.black, Color.cyan)); vv.setBackground(Color.white); final Transformer<Number, String> vertexStringerImpl = new VertexStringerImpl<Number>(map); vv.getRenderContext().setVertexLabelTransformer(vertexStringerImpl); vv.getRenderContext().setVertexLabelRenderer(new DefaultVertexLabelRenderer(Color.cyan)); vv.getRenderContext().setEdgeLabelRenderer(new DefaultEdgeLabelRenderer(Color.cyan)); // features on and off. For a real application, use VertexIconAndShapeFunction instead. final VertexIconShapeTransformer<Number> vertexImageShapeFunction = new VertexIconShapeTransformer<Number>( new EllipseVertexShapeTransformer<Number>()); final DefaultVertexIconTransformer<Number> vertexIconFunction = new DefaultVertexIconTransformer<Number>(); vertexImageShapeFunction.setIconMap(iconMap); vertexIconFunction.setIconMap(iconMap); vv.getRenderContext().setVertexShapeTransformer(vertexImageShapeFunction); vv.getRenderContext().setVertexIconTransformer(vertexIconFunction); // Get the pickedState and add a listener that will decorate the // Vertex images with a checkmark icon when they are picked PickedState<Number> ps = vv.getPickedVertexState(); ps.addItemListener(new PickWithIconListener(vertexIconFunction)); vv.addPostRenderPaintable(new VisualizationServer.Paintable() { int x; int y; Font font; FontMetrics metrics; int swidth; int sheight; String str = "Thank You, slashdot.org, for the images!"; public void paint(Graphics g) { Dimension d = vv.getSize(); if (font == null) { font = new Font(g.getFont().getName(), Font.BOLD, 20); metrics = g.getFontMetrics(font); swidth = metrics.stringWidth(str); sheight = metrics.getMaxAscent() + metrics.getMaxDescent(); x = (d.width - swidth) / 2; y = (int) (d.height - sheight * 1.5); } g.setFont(font); Color oldColor = g.getColor(); g.setColor(Color.lightGray); g.drawString(str, x, y); g.setColor(oldColor); } public boolean useTransform() { return false; } }); // add a listener for ToolTips vv.setVertexToolTipTransformer(new ToStringLabeller<Number>()); Container content = getContentPane(); final GraphZoomScrollPane panel = new GraphZoomScrollPane(vv); content.add(panel); final DefaultModalGraphMouse<Number, Number> graphMouse = new DefaultModalGraphMouse<Number, Number>(); vv.setGraphMouse(graphMouse); 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()); } }); JComboBox modeBox = graphMouse.getModeComboBox(); JPanel modePanel = new JPanel(); modePanel.setBorder(BorderFactory.createTitledBorder("Mouse Mode")); modePanel.add(modeBox); 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(scaleGrid); controls.add(modePanel); content.add(controls, BorderLayout.SOUTH); this.viewSupport = new HyperbolicImageLensSupport<Number, Number>(vv); this.modelSupport = new LayoutLensSupport<Number, Number>(vv); graphMouse.addItemListener(modelSupport.getGraphMouse().getModeListener()); graphMouse.addItemListener(viewSupport.getGraphMouse().getModeListener()); ButtonGroup radio = new ButtonGroup(); JRadioButton none = new JRadioButton("None"); none.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { if (viewSupport != null) { viewSupport.deactivate(); } if (modelSupport != null) { modelSupport.deactivate(); } } }); none.setSelected(true); JRadioButton hyperView = new JRadioButton("View"); hyperView.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { viewSupport.activate(e.getStateChange() == ItemEvent.SELECTED); } }); JRadioButton hyperModel = new JRadioButton("Layout"); hyperModel.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { modelSupport.activate(e.getStateChange() == ItemEvent.SELECTED); } }); radio.add(none); radio.add(hyperView); radio.add(hyperModel); JMenuBar menubar = new JMenuBar(); JMenu modeMenu = graphMouse.getModeMenu(); menubar.add(modeMenu); JPanel lensPanel = new JPanel(new GridLayout(2, 0)); lensPanel.setBorder(BorderFactory.createTitledBorder("Lens")); lensPanel.add(none); lensPanel.add(hyperView); lensPanel.add(hyperModel); controls.add(lensPanel); } /** * A simple implementation of VertexStringer that * gets Vertex labels from a Map * * @author Tom Nelson * * */ class VertexStringerImpl<V> implements Transformer<V, String> { Map<V, String> map = new HashMap<V, String>(); boolean enabled = true; public VertexStringerImpl(Map<V, String> map) { this.map = map; } /* (non-Javadoc) * @see edu.uci.ics.jung.graph.decorators.VertexStringer#getLabel(edu.uci.ics.jung.graph.Vertex) */ public String transform(V v) { if (isEnabled()) { return map.get(v); } else { return ""; } } /** * @return Returns the enabled. */ public boolean isEnabled() { return enabled; } /** * @param enabled The enabled to set. */ public void setEnabled(boolean enabled) { this.enabled = enabled; } } /** * create some vertices * @param count how many to create * @return the Vertices in an array */ private Number[] createVertices(int count) { Number[] v = new Number[count]; for (int i = 0; i < count; i++) { v[i] = new Integer(i); graph.addVertex(v[i]); } return v; } /** * create edges for this demo graph * @param v an array of Vertices to connect */ void createEdges(Number[] v) { graph.addEdge(new Double(Math.random()), v[0], v[1], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[3], v[0], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[0], v[4], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[4], v[5], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[5], v[3], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[2], v[1], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[4], v[1], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[8], v[2], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[3], v[8], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[6], v[7], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[7], v[5], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[0], v[9], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[9], v[8], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[7], v[6], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[6], v[5], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[4], v[2], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[5], v[4], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[4], v[10], EdgeType.DIRECTED); graph.addEdge(new Double(Math.random()), v[10], v[4], EdgeType.DIRECTED); } public static class PickWithIconListener implements ItemListener { DefaultVertexIconTransformer<Number> imager; Icon checked; public PickWithIconListener(DefaultVertexIconTransformer<Number> imager) { this.imager = imager; checked = new Checkmark(Color.red); } public void itemStateChanged(ItemEvent e) { Icon icon = imager.transform((Number) e.getItem()); if (icon != null && icon instanceof LayeredIcon) { if (e.getStateChange() == ItemEvent.SELECTED) { ((LayeredIcon) icon).add(checked); } else { ((LayeredIcon) icon).remove(checked); } } } } /** * 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 HyperbolicVertexImageShaperDemo()); frame.pack(); frame.setVisible(true); } }