Upgrade and extend the programs Draw.java and DrawCanvas.java used in the class to enable drawing of multiple shapes as follows:

1. Replace and upgrade all the AWT components used in the programs to the corresponding Swing components including Frame, Button, Label, Choice, and Panel.

2. Enable drawing of multiple shapes on the canvas. Add a JList to the left of the canvas to show the list of shapes that are currently drawn on the canvas. Each entry in the list should contain the name of the shape and its x and y coordinates. The list should be updated when a new shape is added on the canvas.

3. Add a JButton with the label Remove Shape below the list of shapes. Complete the program so that an existing shape can be removed by selecting the shape in the list first and then clicking on the remove button. The list and the canvas should be updated accordingly.

// Import Core Java packages

import java.awt.*;

import java.awt.event.*;

public class Draw extends Frame implements ActionListener, ItemListener {

// Initial Frame size

static final int WIDTH = 400; // frame width

static final int HEIGHT = 300; // frame height

// Color choices

static final String COLOR_NAMES[] = {"None", "Red", "Blue", "Green"};

static final Color COLORS[] = {null, Color.red, Color.blue, Color.green};

// Button control

Button circle;

Button roundRec;

Button threeDRec;

// Color choice box

Choice colorChoice;

// the canvas

DrawCanvas canvas;

/**

* Constructor

*/

public Draw() {

super("Java Draw");

setLayout(new BorderLayout());

// create panel for controls

Panel topPanel = new Panel(new GridLayout(2, 1));

add(topPanel, BorderLayout.NORTH);

// create button control

Panel buttonPanel = new Panel(new FlowLayout(FlowLayout.LEFT));

topPanel.add(buttonPanel);

circle = new Button("Circle");

buttonPanel.add(circle);

roundRec = new Button("Rounded Rectangle");

buttonPanel.add(roundRec);

threeDRec = new Button("3D Rectangle");

buttonPanel.add(threeDRec);

// add button listener

circle.addActionListener(this);

roundRec.addActionListener(this);

threeDRec.addActionListener(this);

// create panel for color choices

Panel colorPanel = new Panel(new FlowLayout(FlowLayout.LEFT));

topPanel.add(colorPanel);

Label label = new Label("Filled Color:");

colorPanel.add(label);

colorChoice = new Choice();

for(int i=0; i

colorChoice.add(COLOR_NAMES[i]);

}

colorPanel.add(colorChoice);

colorChoice.addItemListener(this);

// create the canvas

canvas = new DrawCanvas();

add(canvas, BorderLayout.CENTER);

} // end of constructor

/**

* Implementing ActionListener

*/

public void actionPerformed(ActionEvent event) {

if(event.getSource() == circle) { // circle button

canvas.setShape(DrawCanvas.CIRCLE);

}

else if(event.getSource() == roundRec) { // rounded rectangle button

canvas.setShape(DrawCanvas.ROUNDED_RECTANGLE);

}

else if(event.getSource() == threeDRec) { // 3D rectangle button

canvas.setShape(DrawCanvas.RECTANGLE_3D);

}

}

/**

* Implementing ItemListener

*/

public void itemStateChanged(ItemEvent event) {

Color color = COLORS[colorChoice.getSelectedIndex()];

canvas.setFilledColor(color);

}

/**

* the main method

*/

public static void main(String[] argv) {

// Create a frame

Draw frame = new Draw();

frame.setSize(WIDTH, HEIGHT);

frame.setLocation(150, 100);

// add window closing listener

frame.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent event) {

System.exit(0);

}

});

// Show the frame

frame.setVisible(true);

}

}

// Import Core Java packages

import java.awt.*;

import java.awt.event.*;

public class DrawCanvas extends Canvas implements MouseListener,

MouseMotionListener {

// Constants for shapes

public static final int CIRCLE = 1;

public static final int ROUNDED_RECTANGLE = 2;

public static final int RECTANGLE_3D = 3;

// Coordinates of points to draw

private int x1, y1, x2, y2;

// shape to draw

private int shape = CIRCLE;

/**

* Method to set the shape

*/

public void setShape(int shape) {

this.shape = shape;

}

// filled color

private Color filledColor = null;

/**

* Method to set filled color

*/

public void setFilledColor(Color color) {

filledColor = color;

}

/**

* Constructor

*/

public DrawCanvas() {

addMouseListener(this);

addMouseMotionListener(this);

} // end of constructor

/**

* painting the component

*/

public void paint(Graphics g) {

// the drawing area

int x, y, width, height;

// determine the upper-left corner of bounding rectangle

x = Math.min(x1, x2);

y = Math.min(y1, y2);

// determine the width and height of bounding rectangle

width = Math.abs(x1 - x2);

height = Math.abs(y1 - y2);

if(filledColor != null)

g.setColor(filledColor);

switch (shape) {

case ROUNDED_RECTANGLE :

if(filledColor == null)

g.drawRoundRect(x, y, width, height, width/4, height/4);

else

g.fillRoundRect(x, y, width, height, width/4, height/4);

break;

case CIRCLE :

int diameter = Math.max(width, height);

if(filledColor == null)

g.drawOval(x, y, diameter, diameter);

else

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

break;

case RECTANGLE_3D :

if(filledColor == null)

g.draw3DRect(x, y, width, height, true);

else

g.fill3DRect(x, y, width, height, true);

break;

}

}

/**

* Implementing MouseListener

*/

public void mousePressed(MouseEvent event) {

x1 = event.getX();

y1 = event.getY();

}

public void mouseReleased(MouseEvent event) {

x2 = event.getX();

y2 = event.getY();

repaint();

}

public void mouseClicked(MouseEvent e) {}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

/**

* Implementing MouseMotionListener

*/

public void mouseDragged(MouseEvent event) {

x2 = event.getX();

y2 = event.getY();

repaint();

}

public void mouseMoved(MouseEvent e) {}

}