Creating multiple rectangle objects

Question

Hi all
Just having a bit of trouble with a drawing applet i'm creating. At the moment i want the user to be able to click on the screen and the mouse presses and releases define the size of the rectangle. This isn't a problem its just that now i want them to be albe to add more shapes by clicking a new Shape button. at the min my code seems to get stuck in the while loop in the paint method i think, and then it says that the applet is disposed?
Any ideas where i could be going wrong?
Cheeers for any pointers
Heres the code
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.util.*;
public class drawingApplet extends Applet
                       implements ActionListener, MouseListener
     private Button newShape = new Button("New");
     private Button button2D = new Button("2D");
     //arraylist for objects
     ArrayList shapesArray = new ArrayList();
          boolean drawObject = true; //Drawing Mode
     boolean moveObject = false;
          private Color color = Color.black;
     int x1,y1,x2,y2,x3,y3,x4,y4 = 0;
     int startX,startY,width,height = 0;
     Rectangle myRectangle = new Rectangle(startX,startY,width,height);
          public void init()
          Panel pEast = new Panel();
          pEast.setLayout(new GridLayout(7,1));
          pEast.add(newShape);
          pEast.add(button2D);
          setBackground(Color.gray);
          newShape.addActionListener(this);
          button2D.addActionListener(this);
          addMouseListener(this);
    public void paint(Graphics g)
          Graphics2D g2 = (Graphics2D)g;
          g2.setColor(color);
          //create Rectangle Object
          myRectangle = new Rectangle(50,50,50,50);
          shapesArray.add(myRectangle);
          Iterator it = shapesArray.iterator();
          while(it.hasNext())
               //DRAW Object
               if(drawObject == true){
                    g2.draw(myRectangle);
          }//--> End of While loop
     }     //--> End of Paint()
     //--> Start of actionPeformed()
    public void actionPerformed(ActionEvent a)
        if (a.getSource()== button2D){
               drawObject = true;
               moveObject = false;
          }else if(a.getSource()== newShape){
               //add rectangle to arraylist
               shapesArray.add(myRectangle);
        repaint();}
    }//--> End of actionPerformed()
    //--> Start of section dealing with Mouse Events
    public void mouseClicked(MouseEvent e)
    public void mouseEntered(MouseEvent e)
    public void mouseExited(MouseEvent e)
    public void mousePressed(MouseEvent e)
          x1 = e.getX();
          y1 = e.getY();
          if(myRectangle.contains(x1,y1)){
               drawObject = false;
               moveObject = true;
          }else{ //draw the object
               drawObject = true;}
     }//--> End of mousePressed()
     public void mouseReleased(MouseEvent e)
          //get the positions of where the mouse was released
          x2 = e.getX();
          y2 = e.getY();
          if(drawObject == true){
               if (x1 != x2 && y1 != y2){
               //maths to work out where to draw the object
               if(x1 < x2 && y1 < y2){//1
                    startX = x1;
                    startY = y1;
                    height = y2 - y1;
                    width = x2 - x1;}
               else if (x1 > x2 && y1 > y2){//2
                    startX = x2;
                    startY = y2;
                    height = y1 - y2;
                    width = x1 - x2;}
               else if (x1 > x2 && y1 < y2){//3
                    startX = x2;
                    startY = y1;
                    height = y2 - y1;
                    width = x1 - x2;
               else if (x1 < x2 && y1 > y2){//4
                    startX = x1;
                    startY = y2;
                    height = y1 - y2;
                    width = x2 - x1;}
          }else if(moveObject == true){
               if (x1 != x2 && y1 != y2){
                    startX = x2;
                    startY = y2;
                    width = myRectangle.width;
                    height = myRectangle.height;
          repaint();
     }//--> End of mouseReleased()
}Also if anybody has some examples i could look at i would be very grateful. Cheers!!

Answer 1

/*  <applet code="AddingRectangles" width="400" height="300"></applet>
*  use: >appletviewer AddingRectangles.java
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class AddingRectangles extends Applet implements ActionListener, MouseListener
    private Button newShape = new Button("New");
    private Button button2D = new Button("2D");
    //arraylist for objects
    ArrayList shapesArray = new ArrayList();
    boolean drawObject = true; //Drawing Mode
    boolean moveObject = false;
    private Color color = Color.black;
    int x1,y1,x2,y2,x3,y3,x4,y4 = 0;
    int startX,startY,width,height = 0;
    Rectangle selectedRectangle;
    public void init()
        Panel pEast = new Panel();
        pEast.setLayout(new GridLayout(7,1));
        pEast.add(newShape);
        pEast.add(button2D);
//        setBackground(Color.gray);
        newShape.addActionListener(this);
        button2D.addActionListener(this);
        addMouseListener(this);
    public void paint(Graphics g)
        Graphics2D g2 = (Graphics2D)g;
        g2.setColor(color);
        //create Rectangle Object
//        myRectangle = new Rectangle(50,50,50,50);
//        shapesArray.add(myRectangle);
        Iterator it = shapesArray.iterator();
        while(it.hasNext())
            g2.draw((Rectangle)it.next());
    } //--> End of Paint()
    //--> Start of actionPeformed()
    public void actionPerformed(ActionEvent a)
        if (a.getSource()== button2D){
            drawObject = true;
            moveObject = false;
        }else if(a.getSource()== newShape){
            //add rectangle to arraylist
//            shapesArray.add(myRectangle);
        repaint();
    }//--> End of actionPerformed()
    //--> Start of section dealing with Mouse Events
    public void mouseClicked(MouseEvent e){}
    public void mouseEntered(MouseEvent e){}
    public void mouseExited(MouseEvent e){}
    public void mousePressed(MouseEvent e)
        x1 = e.getX();
        y1 = e.getY();
        selectedRectangle = null;
        Iterator it = shapesArray.iterator();
        Rectangle r;
        while(it.hasNext())
            r = (Rectangle)it.next();
            if(r.contains(x1,y1)){
                drawObject = false;
                moveObject = true;
                selectedRectangle = r;
                break;
        // no rectangle selected
        if(selectedRectangle == null)
            selectedRectangle = new Rectangle(x1, y1, 0, 0);
            drawObject = true;
    }//--> End of mousePressed()
    public void mouseReleased(MouseEvent e)
        //get the positions of where the mouse was released
        x2 = e.getX();
        y2 = e.getY();
        if(drawObject == true){
            if (x1 != x2 && y1 != y2){
                //maths to work out where to draw the object
                if(x1 < x2 && y1 < y2){//1
                    startX = x1;
                    startY = y1;
                    height = y2 - y1;
                    width = x2 - x1;
                else if (x1 > x2 && y1 > y2){//2
                    startX = x2;
                    startY = y2;
                    height = y1 - y2;
                    width = x1 - x2;
                else if (x1 > x2 && y1 < y2){//3
                    startX = x2;
                    startY = y1;
                    height = y2 - y1;
                    width = x1 - x2;
            else if (x1 < x2 && y1 > y2){//4
                startX = x1;
                startY = y2;
                height = y1 - y2;
                width = x2 - x1;
            if(Math.abs(x2 - x1) > 0 && Math.abs(y2 - y1) > 0)
                shapesArray.add(new Rectangle(x1, y1, width, height));
        }else if(moveObject == true){
            if (x1 != x2 && y1 != y2){
                startX = x2;
                startY = y2;
                width = selectedRectangle.width;
                height = selectedRectangle.height;
        repaint();
    }//--> End of mouseReleased()
    public static void main(String[] args)
        Applet applet = new AddingRectangles();
        Frame f = new Frame("Adding Rectangle");
        f.addWindowListener(new WindowAdapter()
            public void windowClosing(WindowEvent e)
                System.exit(0);
        f.add(applet);
        f.setSize(400,300);
        f.setLocation(200,200);
        applet.init();
        applet.start();
        f.setVisible(true);
}