(URGENT!)How to draw multiple circles in java swing

Hi NadiaRashid.

Check the following link or code. Here is the example.

http://forum.java.sun.com/thread.jspa?threadID=782595


Code:

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.event.MouseInputAdapter;
 
public class CirclePanel extends JPanel
{
      private final Map shapesToLocations = new LinkedHashMap();
      private final Stroke stroke = new BasicStroke(3.0f);
      private final Paint paint = Color.BLACK;
 
      public static final void main(String[] args)
      {
            SwingUtilities.invokeLater(new Runnable()
            {
                  public void run()
                  {
                        CirclePanel p = new CirclePanel();
                        p.addShape(new Ellipse2D.Double(10.0, 10.0, 20.0, 20.0));
                        p.addShape(new Ellipse2D.Double(10.0, 40.0, 20.0, 20.0));
 
                        JFrame f = new JFrame();
                        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                        f.setContentPane(p);
                        f.setSize(300, 300);
                        f.setLocationRelativeTo(null);
                        f.setVisible(true);
                  }
 
            });
      }
 
      public CirclePanel()
      {
            MouseHandler h = new MouseHandler();
            addMouseListener(h);
            addMouseMotionListener(h);
      }
 
      public void paintComponent(Graphics g)
      {
            super.paintComponent(g);
            
            Graphics2D g2d = ((Graphics2D) g);
            Paint p = g2d.getPaint();
            Stroke s = g2d.getStroke();
            g2d.setPaint(this.paint);
            g2d.setStroke(this.stroke);
            for (Iterator i = this.shapesToLocations.keySet().iterator(); i.hasNext();)
            {
                  Shape shape = (Shape) i.next();
                  Point location = (Point) this.shapesToLocations.get(shape);
                  g2d.translate(location.x, location.y);
                  g2d.draw(shape);
                  g2d.translate(- location.x, - location.y);
            }
            g2d.setPaint(p);
            g2d.setStroke(s);
      }
 
      public void addShape(Shape shape)
      {
            this.shapesToLocations.put(shape, new Point());
      }
 
      public void removeShape(Shape shape)
      {
            this.shapesToLocations.remove(shape);
      }
 
      private final class MouseHandler extends MouseInputAdapter
      {
            private Shape dragShape = null;
            private Point lastPoint = null;
 
            public void mousePressed(MouseEvent e)
            {
                  lastPoint = e.getPoint();
                  Point p = new Point();
                  for (Iterator i = shapesToLocations.keySet().iterator(); (this.dragShape == null) && i.hasNext();)
                  {
                        Shape shape = (Shape) i.next();
                        Point location = (Point) shapesToLocations.get(shape);
                        p.x = lastPoint.x - location.x;
                        p.y = lastPoint.y - location.y;
                        if (shape.contains(p))
                        {
                              this.dragShape = shape;
                        }
                  }
            }
            
            public void mouseReleased(MouseEvent e)
            {
                  this.dragShape = null;
                  this.lastPoint = null;
            }
 
            public void mouseDragged(MouseEvent e)
            {
                  if (this.dragShape != null)
                  {
                        Point location = (Point) shapesToLocations.get(this.dragShape);
                        location.x += (e.getX() - lastPoint.x);
                        location.y += (e.getY() - lastPoint.y);
                        this.lastPoint = e.getPoint();
                        repaint();
                  }
            }
      }
}

Hi sivachirravuri

Thanx for such a prompt response. This posting is a bit complicated, could you break it down for me? i just need to understand how i write a method to draw a circle...im confused because some online examples use elipses and others use a Circle method...i really have no idea whats going on with swing.

thanks for your response once again....nadia

correction, i mean fillOval NOT elipses...ooops :)

thankx...i found a graphics one too...from sun.com

public void paint(Graphics g) {
        // Dynamically calculate size information
        // (the canvas may have been resized externally...)
         Dimension size = getSize();
         int d = Math.min(size.width, size.height); // diameter
         int x = (size.width - d)/4;
         int y = (size.height - d)/4;
     
        // draw circle (color already set to foreground)
         g.fillOval(x, y, d, d);
         g.setColor(Color.black);
         g.drawOval(x, y, d, d);
     
      }

except now it's hiding all the other stuff i have in my GUI so i need to find a JPanel method for drawing a circle...anyone got anything???
 
thanks for your input sivachirravuri
cheers

Welcome. Did you find my second input understandable...? I hope it will be useful

just found a JPanel one here https://www.experts-exchange.com/questions/21581182/Adding-a-Graphics-element-to-a-JPanel.html?query=java+radius&clearTAFilter=true
 will post whatever i come up with

second input is understandable...now for this post i just put up...just realised its using graphics tooo...but i sorta have direction on how to draw a circle....so you certainly did help...thank you!