Draw figures from a xml and then draw anothers when I click on them

Question

This is what I have to do:
I got a XML file with the info of a drawing: circles, rectangles.....
I read the file and I draw the figures on a JPanel.
And now what I have to do is this:
When I click on a figure I have to recognize what figure is, for example, rectangle number 2 on the XML file. Then I have to read the XML and foud what I have to draw when I click on that figure, this info is on the XML:
<Transition Rectangle="2" NextDraw="Rectangle 3" />
How do I draw all these figures and keep the info I need (name and number of the figure)? And how do I manage mouse events for recognize the click on a figure for draw anothers.
Sorry for my bad english and thanks

Answer 1

I don't know the structure of your XML file.
Anyway, I guess it's something like the following :
shapes.xml
<?xml version="1.0" encoding="UTF-8"?>
<shapes>
     <Transition Rectangle="1" NextDraw="Rectangle 2" />
     <Transition Rectangle="2" NextDraw="Rectangle 3" />
     <Transition Rectangle="3" NextDraw="Circle 1" />
     <Transition Circle="1" NextDraw="Circle 2" />
     <Transition Circle="2" NextDraw="Circle 3" />
     <Transition Circle="3" />
</shapes>Here the java code. Plz, take a look at it and adapt it to your needs.
XMLParserHandler.java
import java.util.HashMap;
import java.util.Map;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;
public class XMLParserHandler extends DefaultHandler {
     Map<String, String> shapes;
     public XMLParserHandler(){
          shapes = new HashMap<String, String>();
     public void startDocument() throws SAXException {
          //System.out.println("Start Shapes Document.xml");
          shapes = new HashMap<String, String>();
     public void endDocument() throws SAXException {
          //System.out.println("End Shapes shapes.xml");
     public void startElement(String uri, String localName, String qName,
               Attributes attributes) throws SAXException {
          //System.out.println("Start Element : " + qName);
          //display(attributes);
          if("TRANSITION".equals(qName.toUpperCase())){
               String key = null;
               String value = "";
               int n = attributes.getLength();
               String attrName;
               for (int i = 0; i < n; i++) {
                    attrName = attributes.getQName(i);
                    if(! "NEXTDRAW".equals(attrName.toUpperCase())){
                         key = new String(attrName+" "+attributes.getValue(i));
                    }else{
                         value = new String(attributes.getValue(i));
               if(key!=null){
                    shapes.put(key.toUpperCase(), value.toUpperCase());
     public void endElement(String uri, String localName, String qName)
               throws SAXException {
          //System.out.println("End Element : " + qName);
     public void characters(char[] ch, int start, int length)
               throws SAXException {
          //System.out.println(new String(ch, start, length));
     public void error(SAXParseException e) throws SAXException {
          throw e;
     public void fatalError(SAXParseException e) throws SAXException {
          throw e;
     public Map<String, String> getShapes() {
          return shapes;
     private void display(Attributes attrs){
          int n = attrs.getLength();
          for (int i = 0; i < n; i++) {
               System.out.println("***"+attrs.getQName(i)+" = "+attrs.getValue(i));
MyPanel.java
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.swing.JPanel;
public class MyPanel extends JPanel {
     static String CIRCLE = "CIRCLE";
     static String RECTANGLE = "RECTANGLE";
     public List shapeList;
     int currentIndex = 0;
     Shape currentShape;
     public MyPanel(Map shapes, String entry) {
          createShapeList(shapes, entry);
          addMouseListener(new MyMouseListener());
     private String getShapeName(String value){
          return value.split("\\s+")[0];
     private void createShapeList(Map shapes, String entry){
          shapeList = new ArrayList();
          Shape shape=null;
          String key = new String(entry);
          String value ;
          int i=0;
          do{
               value=getShapeName(key);
               System.out.println(value);
               if(CIRCLE.equals(value)){
                    shape = new Ellipse2D.Double(5, 5+40*i, 20, 20);
                    System.out.println("==> added circle");
               }else if(RECTANGLE.equals(value)){
                    shape = new Rectangle2D.Double(5, 5+40*i, 20, 20);
                    System.out.println("==> added rectangle");
               shapeList.add(shape);
               key = (String)shapes.get(key);
               i++;
          }while(value!=null&&value.trim().length()>0);
          currentShape = (Shape)shapeList.get(currentIndex);
     class MyMouseListener extends MouseAdapter{
          public void mouseClicked(MouseEvent e) {
               int x = e.getX();
               int y = e.getY();
               if(currentShape.contains(x, y)){
                    if(currentIndex<shapeList.size()-1){
                         currentIndex++;
                         currentShape = (Shape)shapeList.get(currentIndex);
                         repaint();
     public void paint(Graphics g) {
          Graphics2D g2 = (Graphics2D) g;
          g2.setPaint(Color.red);
          for (int i = 0; i < currentIndex+1; i++) {
               g2.fill((Shape)shapeList.get(i));
Main.java
import java.io.File;
import java.util.Map;
import javax.swing.JFrame;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
public class Main {
     public static void main(String[] args) {
          SAXParserFactory spf = SAXParserFactory.newInstance();
          SAXParser parser;
          Map myShapes = null;
          try {
               parser = spf.newSAXParser();
               XMLParserHandler handler = new XMLParserHandler();
               parser.parse(new File("shapes.xml"), handler);
               myShapes = handler.getShapes();
               String entry = "RECTANGLE 1";
               //Create and set up the window.
               JFrame frame = new JFrame("MyFrame");
               frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               // Create and set up the content pane.
               MyPanel newContentPane = new MyPanel(myShapes, entry);
               newContentPane.setOpaque(true); // content panes must be opaque
               frame.setContentPane(newContentPane);
               // Display the window.
               frame.setSize(400, 400);
               frame.setResizable(false);
               frame.setVisible(true);
          }catch(Exception e){
               e.printStackTrace();
NB: as mentioned in the Main class (see main method), you should provide the main entry for your xml file : String entry = "RECTANGLE 1";Hope That Helps