/* Cart * Anderson, Franceschi */ import javax.swing.JFrame; import java.awt.Graphics; import java.awt.Color; import java.text.DecimalFormat;

public class Cart { Item[] items; int itemSize = 4; int currentItem;

double currentTotal; double exactTotal; Color background = new Color( 205, 205, 205 );

public Cart( ) { items = new Item[ itemSize ];

// // Student can modify constructors' arguments below // Check out the 3 constructors // argument represents price // items[0] = new Milk( 2.00 ); items[1] = new Cereal( 3.50 ); items[2] = new OrangeJuice( 3.00 ); // //

items[3] = new Divider( -0.99 ); currentTotal = 0.0; exactTotal = 0.0; currentItem = -1; }

public void setCurrentItem( int ci ) { currentItem = ci; }

public int getCurrentItem( ) { return currentItem; }

public Item [] getItems( ) { return items; }

public int getItemSize( ) { return itemSize; }

public void updateTotal( double newCurrentTotal ) { currentTotal = newCurrentTotal; }

public double getTotal( ) { return currentTotal; }

public void setExactTotal( double newExactTotal ) { exactTotal = newExactTotal; }

public Color getBackground( ) { return background; }

public void draw( Graphics g ) { g.setColor( Color.BLACK ); g.fillRoundRect( 50, 200, 150, 10, 2, 2 ); // belt g.setColor( new Color( 220, 110, 55 ) ); g.fill3DRect( 195, 200, 60, 70, true ); // bag

DecimalFormat money = new DecimalFormat( "$0.00" );

String displayStudentTotal = "Your subtotal = " + money.format( currentTotal ); String displayExactTotal = "Correct subtotal = " + money.format( exactTotal );

g.setColor( Color.BLUE ); g.drawString( displayStudentTotal, 20, 75 ); g.drawString( displayExactTotal, 20, 100 );

if ( currentItem != -1 ) items[currentItem].draw( g, 50, 200, 200, background );

} }

/* Cashier class Anderson, Franceschi */

import java.awt.Graphics; import java.awt.Color; import javax.swing.JFrame; import javax.swing.JOptionPane; import java.text.DecimalFormat;

public class Cashier extends JFrame { private Cart cart; private Item previousItem; private double currentTotal;

public Cashier() { super("Chapter 6 Programming Activity 1"); cart = new Cart(); previousItem = null; currentTotal = 0.0; getContentPane().setBackground(cart.getBackground()); setSize(300, 300); setVisible(true); }

public void checkout() { /* ***** Student writes the body of this method ***** */ // // Using a while loop, calculate the total price // of the groceries // // The getNext method (in this Cashier class) returns the // next item on the conveyor belt, which is an Item object // (we do not know which item and we do not know how many items // are in the cart - this is randomly generated). // getNext does not take any arguments. Its API is: // Item getNext() // // Right after you update the current subtotal, // you should call the animate method. // The animate method takes one parameter: a double, // which is your current subtotal // For example, if the name of your variable representing // the current subtotal is total, your call to the animate // method should be: // animate(total); // // The instance method getPrice of the Item class // returns the price of the Item object. // The method getPrice does not take any arguments. // Its API is: // double getPrice() // // The cart is empty when the getNext method returns // the divider Item. // You detect the divider item because its price // is -0.99. So an Item with a price of -0.99 // is the sentinel value for the loop. // // After you scan the divider, display the total // for the cart in a dialog box. // Student code starts here:

// Student code ends here. }

public Item getNext() { // get next item // if the first item is the divider, that is ok - the cart is empty int number = ((int) (Math.random() * cart.getItemSize())); cart.setCurrentItem(number);

// update previousItem so that we can keep track of the current total previousItem = cart.getItems()[cart.getCurrentItem()];

// update currentTotal if ((previousItem != null) && (previousItem.getPrice() >= 0)) currentTotal += previousItem.getPrice(); cart.setExactTotal(currentTotal);

// animate divider if necessary if (number == 3) animate(cart.getTotal()); return (cart.getItems())[cart.getCurrentItem()]; }

public void animate(double subtotal) { cart.updateTotal(subtotal); repaint(); try { Thread.sleep(3000); // wait for the animation to finish } catch (Exception e) { } }

public void paint(Graphics g) { super.paint(g); cart.draw(g); }

public static void main(String [] args) { Cashier app = new Cashier(); app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); app.checkout(); }

}

/* Cereal * Anderson, Franceschi */ import java.awt.Graphics; import java.awt.Color; import java.text.DecimalFormat;

public class Cereal extends Item { public Cereal( double p ) { super( p ); }

public void draw( Graphics g, int startX, int endX, int y, Color eraseColor ) { DecimalFormat money = new DecimalFormat( "$0.00" );

String display1 = "Cereal: Unit price = " + money.format( price );

g.setColor( Color.BLUE ); g.drawString( display1, 20, 50 );

for ( int x = startX; x < endX; x += 5 ) { g.setColor( new Color( 255, 255, 51 ) ); g.fillRect( x, y - 68, 48, 65 ); g.setColor( Color.BLACK ); g.drawString("Cereal", x + 5, y - 45 ); g.setColor( Color.RED ); g.drawOval( x + 18, y - 35, 8, 8 ); g.drawOval( x + 13, y - 30, 8, 8 ); g.drawOval( x + 23, y - 30, 8, 8 ); g.fillArc( x + 10, y - 35, 24, 25, 0, -180 ); try { Thread.sleep( ( int )( 100 ) ); } catch ( InterruptedException e ) { e.printStackTrace( ); } // erase g.setColor( eraseColor ); // background g.fillRect( x, y - 70, 50, 70 ); } } }

/** Divider * Anderson, Franceschi */

import java.awt.Graphics; import java.awt.Color; import java.text.DecimalFormat;

public class Divider extends Item { public Divider( double p ) { super( p ); }

public void draw( Graphics g, int startX, int endX, int y, Color eraseColor ) {

DecimalFormat money = new DecimalFormat( "$0.00");

for ( int x = startX; x < endX; x += 5 ) {

g.setColor( Color.YELLOW ); g.fillRoundRect( x, y - 20, 63, 18, 5, 5 ); g.setColor( Color.BLACK ); g.drawRoundRect( x, y - 20, 63, 18, 5, 5 ); g.drawString("Thank you!", x + 2, y - 5 ); try { Thread.sleep( ( int )( 100 ) ); } catch ( InterruptedException e ) { e.printStackTrace( ); } // erase g.setColor( eraseColor ); g.fillRect( x, y - 70, 65, 70 ); } } }

/* Item * Anderson, Franceschi */ import java.awt.Graphics; import java.awt.Color;

public abstract class Item { protected double price;

public Item( double p ) { price = p; }

public void setPrice( double newPrice ) { price = ( newPrice > 0 ? newPrice : 0 ); }

public double getPrice( ) { return price; }

public abstract void draw( Graphics g, int startX, int endX, int y, Color eraseColor );

}

/* Milk * Anderson, Franceschi */ import java.awt.Graphics; import java.awt.Color; import java.text.DecimalFormat;

public class Milk extends Item {

public Milk( double p ) { super( p ); }

public void draw( Graphics g, int startX, int endX, int y, Color eraseColor ) { DecimalFormat money = new DecimalFormat( "$0.00" );

String display1 = "Milk: Unit price = " + money.format( price );

g.setColor( Color.BLUE ); g.drawString( display1, 20, 50 );

for ( int x = startX; x < endX; x += 5 ) { g.setColor( Color.WHITE ); g.fillRect( x +1, y - 67, 30, 65 ); g.setColor( Color.LIGHT_GRAY ); g.drawLine( x, y - 55, x + 30, y - 55 ); g.drawRect( x, y - 68, 31, 66 ); g.setColor( Color.BLACK ); g.drawString( "Milk", x + 3, y - 44 ); try { Thread.sleep( ( int )( 100 ) ); } catch ( InterruptedException e ) { e.printStackTrace( ); } // erase g.setColor( eraseColor ); g.fillRect( x, y - 70, 50, 70 ); } } }

/* OrangeJuice * Anderson, Franceschi */ import java.awt.Graphics; import java.awt.Color; import java.text.DecimalFormat;

public class OrangeJuice extends Item { public OrangeJuice( double p ) { super( p ); }

public void draw( Graphics g, int startX, int endX, int y, Color eraseColor ) { DecimalFormat money = new DecimalFormat( "$0.00" );

String display1 = "Orange Juice: Unit price = " + money.format( price );

g.setColor( Color.BLUE ); g.drawString( display1, 20, 50 );

for ( int x = startX; x < endX; x += 5 ) { g.setColor( new Color( 244, 244, 102 ) ); g.fillRect( x, y - 68, 30, 65 ); g.setColor( Color.LIGHT_GRAY ); g.drawLine( x, y - 52, x + 30, y - 52 ); g.setColor( Color.BLACK ); g.drawString("OJ", x + 7, y - 38 ); g.setColor( new Color( 255, 132, 41 ) ); g.fillOval( x + 8, y - 33, 15, 17 ); try { Thread.sleep( ( int )( 100 ) ); } catch ( InterruptedException e ) { e.printStackTrace( ); } // erase g.setColor( eraseColor ); g.fillRect( x, y - 70, 50, 70 ); } } }