Extend the programs

Draw.java and DrawCanvas.java used in the class as follows:

1.Add a group of three more buttons BELOW the existing ones to enable the drawing of lines, squares, and ovals. These buttons should work the same way as the existing ones. The chosen shape is drawn when the mouse is dragged with the mouse button being pressed down and then released.

2.Add a Clear button NEXT to the right of the color choice box. When the

Clear button is clicked, any existing drawing should be erased immediately. However, the current drawing shape and filled color should not change.

3.Add a Reset button NEXT to the right of the Clear button. When the

Reset button is clicked, any existing drawing should be erased, plus the drawing should be set to the circle shape with no filled color.

code for Draw.Java:

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

// 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); }

Code for DrawCanvas.java:

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) {} }