import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JButton;

import javax.swing.JPanel;

import java.awt.event.MouseMotionListener;

import java.awt.event.MouseEvent;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.awt.Container;

import java.awt.BorderLayout;

import java.awt.Graphics;

import java.awt.Color;

import java.awt.GridLayout;

public class Painter extends JFrame implements MouseMotionListener, ActionListener

{

private int x = -10, y = -10;

private Color col = Color.BLACK;

public Painter()

{

//jframe setup

setSize(800,600);

setTitle("Painter");

setDefaultCloseOperation(EXIT_ON_CLOSE);

//set the layout

JPanel p = new JPanel();

p.setLayout (new GridLayout(4,1));

JButton red = new JButton("red");

red.setBackground(Color.RED);

JButton yellow = new JButton("yellow");

yellow.setBackground(Color.YELLOW);

JButton blue = new JButton("blue");

blue.setBackground(new Color (51, 51, 204));

JButton black = new JButton("black");

black.setBackground(Color.BLACK);

p.add(red);

p.add(yellow);

p.add(blue);

p.add(black);

red.addActionListener(this);

blue.addActionListener(this);

yellow.addActionListener(this);

black.addActionListener(this);

Container c = this.getContentPane();

c.setLayout(new BorderLayout());

JLabel direc =new JLabel("Drag to draw", JLabel.RIGHT);

c.add(direc, BorderLayout.SOUTH);

c.add(p, BorderLayout.EAST);

//add mousemotionlistener

c.addMouseMotionListener(this);

//the final step

setVisible(true);

}

public void actionPerformed(ActionEvent e)

{

String act = e.getActionCommand();

if (act.equals("blue"))

col = new Color(51, 51, 204);

else if (act.equals("red"))

col = Color.RED;

else if (act.equals("yellow"))

col = Color.YELLOW;

else //choose black

col = Color.BLACK;

}

public void mouseMoved(MouseEvent e)

{

//empty

}

public void mouseDragged(MouseEvent e)

{

x = e.getX(); y = e.getY();

repaint();

}

public void paint (Graphics g)

{

g.setColor(col);

g.fillOval(x, y, 4, 4);

}

public static void main (String[] args)

{

Painter p = new Painter();

}

}