how to draw a fill rectangle using mouse and paintComponent?

[java_fun2007]

hi
I need to make a simple program to draw fillRect using MouseMotionListener and paintComponent on a JPanel.
I don't know how to get the width and height of the rectangle but I've tried this it doesn't draw any rectangle:
I calculated the height and width according to the mousedragged point and mousereleased point.

Thanks

Code:

import java.awt.Point;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JPanel;
import javax.swing.*;
public class DrawRect extends JPanel
{
	private int pointCount =0;
	private int pointCount2 =0;
	private Point points[] = new Point[100];
	private Point points2[] = new Point[100];
	public DrawRect()
	{
		addMouseMotionListener( new MouseMotionAdapter()
		{
			public void mouseDragged(MouseEvent ev)
			{
				if (pointCount < points.length)
				{
					points[pointCount] = ev.getPoint();
					pointCount++;
				
					repaint();
				}
			}//end mouse drag
			public void mouseReleased(MouseEvent ev)
			{
				if (pointCount2<points2.length)
				{
					points2[pointCount2]= ev.getPoint();
					pointCount2++;
					repaint();
				}
			}
		}
		);
	}
public void paintComponent(Graphics g)
{
	super.paintComponent(g);
	for (int i =0;i<pointCount;i++)
 
	g.fillRect(points[i].x,points[i].y,points2[i].x - points[0].x,points2[i].y - points[0].y);
}	
  public static void main(String[] args) {
        DrawRect test = new DrawRect();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}

[sukatoa]

this may help you.

[hardwired]

Code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class DrawRectRx extends JPanel
{
    private int pointCount =0;
    private Point points[]  = new Point[100];
    private Point points2[] = new Point[100];
    private Point start = new Point();
    private Point end   = new Point();
    Rectangle rect = new Rectangle();

    public DrawRectRx()
    {
        addMouseMotionListener( new MouseMotionAdapter()
        {
            public void mouseDragged(MouseEvent ev)
            {
                end = ev.getPoint();
                rect.setFrameFromDiagonal(start, end);
                repaint();
            }//end mouse drag
        });
        addMouseListener(new MouseAdapter()
        {
            public void mousePressed(MouseEvent e)
            {
                start = e.getPoint();
            }

            public void mouseReleased(MouseEvent ev)
            {
                points[pointCount] = start;
                points2[pointCount] = ev.getPoint();
                pointCount++;
                rect.setFrameFromDiagonal(start, start);
                repaint();
            }
        });
    }

    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        // Draw line being dragged.
        g2.setPaint(Color.red);
        g2.draw(rect);
        // Draw lines between points in arrays.
        g2.setPaint(Color.blue);
        Rectangle r = new Rectangle();
        for (int i =0; i < pointCount; i++)
        {
            r.setFrameFromDiagonal(points[i], points2[i]);
            g2.fill(r);
        }
    }
	
    public static void main(String[] args)
    {
        DrawRectRx test = new DrawRectRx();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(test);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}

[java_fun2007]

Thank you very much I appreciate your help sukatoa & hardwired.

[chiamingtan]

I need to drag and display a rectangle in a JPanel... displaying its coordinates as well. Is anyone out there able to provide helps?? many thanks..:>

[Fubarable]

You should start your own thread for this, not resurrect an old dormant thread.

Also, we can help, but to help we have to know what problems you're encountering. In your new thread, I recommend that you post your code and ask specific questions on how your current code is not working.