In Java: Please modify the following source code so the program looks like the following pictures :

Current Output:

Desired Output:

The colors are already implemented, just gotta create the pencil button and the eraser button to the left of the window and add the colors to the pencil.

Source Code: (2 Java classes)

package javaapplication1;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.RenderingHints;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionAdapter;

import javax.swing.JComponent;

public class JavaApplication1 extends JComponent {

// Image in which we're going to draw

private Image image;

// Graphics2D object ==> used to draw on

private Graphics2D g2;

// Mouse coordinates

private int currentX, currentY, oldX, oldY;

public JavaApplication1() {

setDoubleBuffered(false);

addMouseListener(new MouseAdapter() {

public void mousePressed(MouseEvent e) {

// save coord x,y when mouse is pressed

oldX = e.getX();

oldY = e.getY();

}

});

addMouseMotionListener(new MouseMotionAdapter() {

public void mouseDragged(MouseEvent e) {

// coord x,y when drag mouse

currentX = e.getX();

currentY = e.getY();

if (g2 != null) {

// draw line if g2 context not null

g2.drawLine(oldX, oldY, currentX, currentY);

// refresh draw area to repaint

repaint();

// store current coords x,y as olds x,y

oldX = currentX;

oldY = currentY;

}

}

});

}

protected void paintComponent(Graphics g) {

if (image == null) {

// image to draw null ==> we create

image = createImage(getSize().width, getSize().height);

g2 = (Graphics2D) image.getGraphics();

// enable antialiasing

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

// clear draw area

clear();

}

g.drawImage(image, 0, 0, null);

}

// now we create exposed methods

public void clear() {

g2.setPaint(Color.white);

// draw white on entire draw area to clear

g2.fillRect(0, 0, getSize().width, getSize().height);

g2.setPaint(Color.black);

repaint();

}

public void red() {

// apply red color on g2 context

g2.setPaint(Color.red);

}

public void black() {

g2.setPaint(Color.black);

}

public void magenta() {

g2.setPaint(Color.magenta);

}

public void green() {

g2.setPaint(Color.green);

}

public void blue() {

g2.setPaint(Color.blue);

}

}

*********************************************************************************************

package javaapplication1;

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class SwingPaint {

JButton clearBtn, blackBtn, blueBtn, greenBtn, redBtn, magentaBtn;

JavaApplication1 drawArea;

ActionListener actionListener = new ActionListener() {

public void actionPerformed(ActionEvent e) {

if (e.getSource() == clearBtn) {

drawArea.clear();

} else if (e.getSource() == blackBtn) {

drawArea.black();

} else if (e.getSource() == blueBtn) {

drawArea.blue();

} else if (e.getSource() == greenBtn) {

drawArea.green();

} else if (e.getSource() == redBtn) {

drawArea.red();

} else if (e.getSource() == magentaBtn) {

drawArea.magenta();

}

}

};

public static void main(String[] args) {

new SwingPaint().show();

}

public void show() {

// create main frame

JFrame frame = new JFrame("BlackBoar");

Container content = frame.getContentPane();

// set layout on content pane

content.setLayout(new BorderLayout());

// create draw area

drawArea = new JavaApplication1();

// add to content pane

content.add(drawArea, BorderLayout.CENTER);

// create controls to apply colors and call clear feature

JPanel controls = new JPanel();

JPanel subPanel = new JPanel();

clearBtn = new JButton("Clear");

clearBtn.addActionListener(actionListener);

blackBtn = new JButton("Black");

blackBtn.addActionListener(actionListener);

blueBtn = new JButton("Blue");

blueBtn.addActionListener(actionListener);

greenBtn = new JButton("Green");

greenBtn.addActionListener(actionListener);

redBtn = new JButton("Red");

redBtn.addActionListener(actionListener);

magentaBtn = new JButton("Magenta");

magentaBtn.addActionListener(actionListener);

// add to panel

controls.add(greenBtn);

controls.add(blueBtn);

controls.add(blackBtn);

controls.add(redBtn);

controls.add(magentaBtn);

controls.add(clearBtn);

// add to content pane

content.add(controls, BorderLayout.NORTH);

frame.setSize(600, 600);

// can close frame

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// show the swing paint result

frame.setVisible(true);

}

}

App Green Blue Black Red Magenta Clear