Creating SVG diagrams in Java

Question

I am trying to reproduce this example , which should create an emoticon image using the SVGSalamander API. However, when I run my program, the image does not appear. There is only the main JFrame. Some of the syntaxes should have been different due to the generated code using NetBeans. Unfortunately, I can’t change the generated code. Does anyone have an idea of ​​what changes I need to make to run the example? The only difference in my code is the generated part of the initComponents () method.

This is my code:

class IconPanel extends javax.swing.JPanel { public static final long serialVersioUID = 0; final SVGIcon icon; public IconPanel() { StringReader reader = new StringReader(makeDynamicSVG()); URI uri = SVGCache.getSVGUniverse().loadSVG(reader, "myImage"); icon = new SVGIcon(); icon.setSvgURI(uri); setPreferredSize(new Dimension(400, 400)); } @Override public void paintComponent(Graphics g) { final int width = getWidth(); final int height = getHeight(); g.setColor(getBackground()); g.fillRect(0, 0, width, height); icon.paintIcon(this, g, 0, 0); } private String makeDynamicSVG() { StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw); pw.println("<svg width=\"400\" height=\"400\" style=\"fill:none;stroke-width:4\">"); pw.println(" <circle cx=\"200\" cy=\"200\" r=\"200\" style=\"stroke:blue\"/>"); pw.println(" <circle cx=\"140\" cy=\"140\" r=\"40\" style=\"stroke:red\"/>"); pw.println(" <circle cx=\"260\" cy=\"140\" r=\"40\" style=\"stroke:red\"/>"); pw.println(" <polyline points=\"100 300 150 340 250 240 300 300\" style=\"stroke:red\"/>"); pw.println("</svg>"); pw.close(); return sw.toString(); } } public class MainFrame extends javax.swing.JFrame { /** * Creates new form MainFrame */ public static final long serialVersionUID = 0; IconPanel panel = new IconPanel(); public MainFrame() { initComponents(); this.getContentPane().add(panel, BorderLayout.CENTER); pack(); } @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 400, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 300, Short.MAX_VALUE) ); pack(); }// </editor-fold> /** * @param args the command line arguments */ public static void main(String args[]) { /* * Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* * If Nimbus (introduced in Java SE 6) is not available, stay with the * default look and feel. For details see * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* * Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new MainFrame().setVisible(true); } }); } // Variables declaration - do not modify // End of variables declaration }