a6

assignment6/Question1/IShape.java

@@ -0,0 +1,17 @@
+import java.awt.Graphics;
+
+public interface IShape {
+	public int getX();
+
+	public int getY();
+
+	public void setX(int x);
+
+	public void setY(int y);
+
+	public boolean isVisible(int w, int h);
+
+	public boolean isIn(int x, int y);
+
+	public void draw(Graphics g);
+}

assignment6/Question1/Shape.java

@@ -0,0 +1,51 @@
+import java.awt.Color;
+import java.awt.Graphics;
+
+public abstract class Shape {
+	private int x;
+	private int y;
+	private Color color;
+
+	/**
+	 * Constructor for Shape
+	 *
+	 * @param x
+	 * 	  the x coordinate of the shape
+	 * @param y
+	 * 	  the y coordinate of the shape
+	 */
+	public Shape(int x, int y) {
+		this.x = x;
+		this.y = y;
+		color = new Color((float) Math.random(), (float) Math.random(), (float) Math.random());
+	}
+
+	public int getX() {
+		return x;
+	}
+
+	public void setX(int x) {
+		this.x = x;
+	}
+
+	public int getY() {
+		return y;
+	}
+
+	public void setY(int y) {
+		this.y = y;
+	}
+
+	public abstract boolean isVisible(int w, int h);
+
+	public abstract boolean isIn(int x, int y);
+
+	public void draw(Graphics g) {
+		g.setColor(color);
+	}
+
+	public static void testShape() {
+		// TODO: implement this method
+		// Because this is the abstract so we don't test anything here.
+	}
+}

assignment6/Question1/Start.java

@@ -0,0 +1,5 @@
+public class Start {
+	public static void main(String[] args) {
+		Shape.testShape();
+	}
+}

assignment6/Question2/Bubble.java

@@ -0,0 +1,89 @@
+import java.awt.Graphics;
+
+public class Bubble extends Shape {
+	private double radius;
+
+	/**
+	 * Constructor for the Bubble class.
+	 *
+	 * @param x the x coordinate of the center of the bubble
+	 * @param y the y coordinate of the center of the bubble
+	 */
+	public Bubble(int x, int y) {
+		super(x, y);
+		this.radius = 10;
+	}
+
+	// Find the point (wx, wy) inside the window which is closest to the
+	// center (x, y) of the circle. In other words, find the wx in the
+	// interval [0, w - 1] which is closest to x, and find the wy in the
+	// interval [0, h - 1] which is closest to y.
+	// If the distance between (wx, wy) and (x, y) is less than the radius
+	// of the circle (using Pythagoras's theorem) then at least part of
+	// the circle is visible in the window.
+	// Note: if the center of the circle is inside the window, then (wx, wy)
+	// is the same as (x, y), and the distance is 0.
+	@Override
+	public boolean isVisible(int w, int h) {
+		double x = getX();
+		double y = getY();
+		double wx = (x < 0 ? 0 : (x > w - 1 ? w - 1 : x));
+		double wy = (y < 0 ? 0 : (y > h - 1 ? h - 1 : y));
+		double dx = wx - x;
+		double dy = wy - y;
+		return dx * dx + dy * dy <= radius * radius;
+	}
+
+	/**
+	 * Whether the point at xy is currently inside the bubble
+	 *
+	 * @param x the x coordinate of the point
+	 * @param y the y coordinate of the point
+	 * @return true if the point is inside the bubble, false otherwise
+	 */
+	@Override
+	public boolean isIn(int x, int y) {
+		double dx = x - getX();
+		double dy = y - getY();
+		return dx * dx + dy * dy < radius * radius;
+	}
+
+	/**
+	 * Draw the bubble.
+	 *
+	 * @param g the graphics context
+	 */
+	@Override
+	public void draw(Graphics g) {
+		super.draw(g);
+		g.drawOval(
+				getX() - (int) radius,
+				getY() - (int) radius,
+				(int) radius * 2,
+				(int) radius * 2);
+	}
+
+	public static void testBubble() {
+		Bubble b = new Bubble(20, 30);
+
+		System.out.println(b.getX() == 20);
+		System.out.println(b.getY() == 30);
+
+		b.setX(40);
+		System.out.println(b.getX() == 40);
+		System.out.println(b.getY() == 30);
+
+		b.setY(60);
+		System.out.println(b.getX() == 40);
+		System.out.println(b.getY() == 60);
+		System.out.println(b.isVisible(100, 100) == true);
+
+		b.setX(50);
+		b.setY(0);
+		System.out.println(b.isVisible(100, 100) == true);
+
+		b.setX(99);
+		b.setY(50);
+		System.out.println(b.isVisible(100, 100) == true);
+	}
+}

assignment6/Question2/IShape.java

@@ -0,0 +1,17 @@
+import java.awt.Graphics;
+
+public interface IShape {
+	public int getX();
+
+	public int getY();
+
+	public void setX(int x);
+
+	public void setY(int y);
+
+	public boolean isVisible(int w, int h);
+
+	public boolean isIn(int x, int y);
+
+	public void draw(Graphics g);
+}

assignment6/Question2/Shape.java

@@ -0,0 +1,42 @@
+import java.awt.Color;
+import java.awt.Graphics;
+
+public abstract class Shape {
+	private int x;
+	private int y;
+	private Color color;
+
+	public Shape(int x, int y) {
+		this.x = x;
+		this.y = y;
+		color = new Color((float) Math.random(), (float) Math.random(), (float) Math.random());
+	}
+
+	// getters and setters
+	public int getX() {
+		return x;
+	}
+
+	public void setX(int x) {
+		this.x = x;
+	}
+
+	public int getY() {
+		return y;
+	}
+
+	public void setY(int y) {
+		this.y = y;
+	}
+
+	public abstract boolean isVisible(int w, int h);
+
+	public abstract boolean isIn(int x, int y);
+
+	public void draw(Graphics g) {
+		g.setColor(color);
+	}
+
+	public static void testShape() {
+	}
+}

assignment6/Question2/Start.java

@@ -0,0 +1,6 @@
+public class Start {
+	public static void main(String[] args) {
+		Shape.testShape();
+		Bubble.testBubble();
+	}
+}

assignment6/Question3/Bubble.java

@@ -0,0 +1,65 @@
+import java.awt.Graphics;
+
+public class Bubble extends Shape implements IShape {
+	// instance variables
+	private double radius;
+
+	// constructor
+	public Bubble(int x, int y) {
+		super(x, y);
+		this.radius = 10;
+	}
+
+	// Find the point (wx, wy) inside the window which is closest to the
+	// center (x, y) of the circle. In other words, find the wx in the
+	// interval [0, w - 1] which is closest to x, and find the wy in the
+	// interval [0, h - 1] which is closest to y.
+	// If the distance between (wx, wy) and (x, y) is less than the radius
+	// of the circle (using Pythagoras's theorem) then at least part of
+	// the circle is visible in the window.
+	// Note: if the center of the circle is inside the window, then (wx, wy)
+	// is the same as (x, y), and the distance is 0.
+	@Override
+	public boolean isVisible(int w, int h) {
+		double x = getX();
+		double y = getY();
+		double wx = (x < 0 ? 0 : (x > w - 1 ? w - 1 : x));
+		double wy = (y < 0 ? 0 : (y > h - 1 ? h - 1 : y));
+		double dx = wx - x;
+		double dy = wy - y;
+		return dx * dx + dy * dy <= radius * radius;
+	}
+
+	@Override
+	public boolean isIn(int x, int y) {
+		double dx = x - getX();
+		double dy = y - getY();
+		return dx * dx + dy * dy < radius * radius;
+	}
+
+	@Override
+	public void draw(Graphics g) {
+		super.draw(g);
+		g.drawOval(
+				getX() - (int) radius,
+				getY() - (int) radius,
+				(int) radius * 2,
+				(int) radius * 2);
+	}
+
+	public static void testBubble() {
+		Bubble b = new Bubble(20, 30);
+		System.out.println(b.getX() == 20);
+		System.out.println(b.getY() == 30);
+		b.setX(40);
+		System.out.println(b.getX() == 40);
+		System.out.println(b.getY() == 30);
+		b.setY(60);
+		System.out.println(b.getX() == 40);
+		System.out.println(b.getY() == 60);
+		System.out.println(b.isVisible(100, 100) == true);
+		b.setX(50);
+		b.setY(0);
+		System.out.println(b.isVisible(100, 100) == true);
+	}
+}

assignment6/Question3/IShape.java

@@ -0,0 +1,17 @@
+import java.awt.Graphics;
+
+public interface IShape {
+	public int getX();
+
+	public int getY();
+
+	public void setX(int x);
+
+	public void setY(int y);
+
+	public boolean isVisible(int w, int h);
+
+	public boolean isIn(int x, int y);
+
+	public void draw(Graphics g);
+}

assignment6/Question3/Model.java

@@ -0,0 +1,105 @@
+import java.awt.Graphics;
+import java.util.ArrayList;
+
+public class Model {
+	// instance variables
+	private int score;
+	private ArrayList<IShape> bubbles;
+
+	// constructor
+	public Model() {
+		score = 0;
+		bubbles = new ArrayList<IShape>();
+	}
+
+	// getters and setters
+	public int getScore() {
+		return score;
+	}
+
+	/**
+	 * @param w
+	 * @param h
+	 */
+	public void addBubble(int w, int h) {
+		bubbles.add(new Bubble((int) (w * Math.random()), (int) (h * Math.random())));
+	}
+
+	/**
+	 * @param dx
+	 * @param dy
+	 */
+	public void moveAll(int dx, int dy) {
+		for (int i = 0; i < bubbles.size(); i++) {
+			bubbles.get(i).setX(bubbles.get(i).getX() + dx);
+			bubbles.get(i).setY(bubbles.get(i).getY() + dy);
+		}
+	}
+
+	/**
+	 * clear all bubbles
+	 * 
+	 * @param w
+	 * @param h
+	 */
+	public void clearInvisibles(int w, int h) {
+		for (int i = bubbles.size() - 1; i >= 0; i--) {
+			if (!bubbles.get(i).isVisible(w, h)) {
+				bubbles.remove(i);
+				score--;
+			}
+		}
+	}
+
+	/**
+	 * delete bubbles that are hit by the mouse
+	 * 
+	 * @param x
+	 * @param y
+	 */
+	public void deleteBubblesAtPoint(int x, int y) {
+		for (int i = bubbles.size() - 1; i >= 0; i--) {
+			if (bubbles.get(i).isIn(x, y)) {
+				bubbles.remove(i);
+				score++;
+			}
+		}
+	}
+
+	/**
+	 * draw all bubbles
+	 *
+	 * @param g
+	 */
+	public void drawAll(Graphics g) {
+		for (IShape bubble : bubbles) {
+			bubble.draw(g);
+		}
+	}
+
+	public static void testModel() {
+		Model m = new Model();
+		System.out.println(m.getScore() == 0);
+		System.out.println(m.bubbles.size() == 0);
+		m.addBubble(100, 100);
+		m.addBubble(100, 100);
+		System.out.println(m.getScore() == 0);
+		System.out.println(m.bubbles.size() == 2);
+		m.clearInvisibles(200, 200);
+		System.out.println(m.getScore() == 0);
+		System.out.println(m.bubbles.size() == 2);
+		m.clearInvisibles(0, 0);
+		System.out.println(m.getScore() == -2);
+		System.out.println(m.bubbles.size() == 0);
+		m.addBubble(100, 100);
+		m.addBubble(100, 100);
+		System.out.println(m.getScore() == -2);
+		System.out.println(m.bubbles.size() == 2);
+		m.moveAll(200, 200);
+		System.out.println(m.getScore() == -2);
+		System.out.println(m.bubbles.size() == 2);
+		m.clearInvisibles(200, 200);
+		System.out.println(m.getScore() == -4);
+		System.out.println(m.bubbles.size() == 0);
+	}
+}

assignment6/Question3/Shape.java

@@ -0,0 +1,41 @@
+import java.awt.Color;
+import java.awt.Graphics;
+
+public abstract class Shape {
+	private int x;
+	private int y;
+	private Color color;
+
+	public Shape(int x, int y) {
+		this.x = x;
+		this.y = y;
+		color = new Color((float) Math.random(), (float) Math.random(), (float) Math.random());
+	}
+
+	public int getX() {
+		return x;
+	}
+
+	public void setX(int x) {
+		this.x = x;
+	}
+
+	public int getY() {
+		return y;
+	}
+
+	public void setY(int y) {
+		this.y = y;
+	}
+
+	public abstract boolean isVisible(int w, int h);
+
+	public abstract boolean isIn(int x, int y);
+
+	public void draw(Graphics g) {
+		g.setColor(color);
+	}
+
+	public static void testShape() {
+	}
+}

assignment6/Question3/Start.java

@@ -0,0 +1,7 @@
+public class Start {
+	public static void main(String[] args) {
+		Shape.testShape();
+		Bubble.testBubble();
+		Model.testModel();
+	}
+}

lab/lab12/Question1/MyFrame.java

@@ -0,0 +1,30 @@
+import java.awt.*;
+import javax.swing.*;
+
+public class MyFrame extends JFrame {
+	public MyFrame() {
+		// init frame
+		setSize(400, 300);
+		setTitle("MyFrame");
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		setLayout(new BorderLayout());
+
+		// craete components
+		JPanel panel = new JPanel();
+		panel.setLayout(new FlowLayout(FlowLayout.CENTER));
+		JButton button1 = new JButton("left");
+		JButton button2 = new JButton("right");
+
+		// set layout
+		panel.add(button1);
+		panel.add(button2);
+		add(panel, BorderLayout.PAGE_START);
+
+		// MyPanel object
+		MyPanel mp = new MyPanel(new FlowLayout(FlowLayout.CENTER));
+		add(mp, BorderLayout.CENTER);
+
+		// done
+		setVisible(true);
+	}
+}

lab/lab12/Question1/MyPanel.java

@@ -0,0 +1,21 @@
+import java.awt.*;
+import javax.swing.*;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+public class MyPanel extends JPanel {
+	public MyPanel(LayoutManager layout) {
+		super(layout);
+
+		// add anonymouse listener
+		addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				// print if left clicked
+				if (e.getButton() == MouseEvent.BUTTON1) {
+					System.out.println("Left button clicked at " + e.getX() + "," + e.getY());
+				}
+			}
+		});
+	}
+}

lab/lab12/Question1/Start.java

@@ -0,0 +1,12 @@
+/**
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007).
+ */
+public class Start {
+	public static void main(String args[]) {
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}

lab/lab12/Question2/MyFrame.java

@@ -0,0 +1,28 @@
+import java.awt.*;
+import javax.swing.*;
+
+public class MyFrame extends JFrame {
+	public MyFrame() {
+		// init
+		setSize(400, 300);
+		setTitle("MyFrame");
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		setLayout(new BorderLayout());
+
+		// add layout
+		JPanel panel = new JPanel();
+		panel.setLayout(new FlowLayout(FlowLayout.CENTER));
+		JButton button1 = new JButton("left");
+		JButton button2 = new JButton("right");
+		panel.add(button1);
+		panel.add(button2);
+		add(panel, BorderLayout.PAGE_START);
+
+		// MyPanel object
+		MyPanel mp = new MyPanel(new FlowLayout(FlowLayout.CENTER));
+		add(mp, BorderLayout.CENTER);
+
+		// done
+		setVisible(true);
+	}
+}

lab/lab12/Question2/MyPanel.java

@@ -0,0 +1,37 @@
+import java.awt.*;
+import javax.swing.*;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+public class MyPanel extends JPanel {
+	private int x = -1;
+	private int y = -1;
+
+	public MyPanel(LayoutManager layout) {
+		super(layout);
+
+		// anonymouse listener
+		addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				// left clicked
+				if (e.getButton() == MouseEvent.BUTTON1) {
+					System.out.println("Left button clicked at " + e.getX() + "," + e.getY());
+				}
+				x = e.getX();
+				y = e.getY();
+				repaint();
+			}
+		});
+	}
+
+	@Override
+	protected void paintComponent(Graphics g) {
+		super.paintComponent(g);
+
+		// red dot
+		g.setColor(Color.RED);
+		g.drawRect(x, y, 1, 1);
+	}
+
+}

lab/lab12/Question2/Start.java

@@ -0,0 +1,12 @@
+/**
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007).
+ */
+public class Start {
+	public static void main(String args[]) {
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}

lab/lab13/Question1/Controller.java

@@ -0,0 +1,13 @@
+public class Controller {
+	protected Model m;
+
+	public Controller(Model m) {
+		this.m = m;
+	}
+
+	// save data before shutdown
+	protected void shutdown() {
+		m.saveData();
+		System.exit(0);
+	}
+}

lab/lab13/Question1/ControllerClicks.java

@@ -0,0 +1,19 @@
+import java.awt.Point;
+
+public class ControllerClicks extends Controller {
+	public ControllerClicks(Model m) {
+		super(m);
+	}
+
+	public void mouseClicked(Point p) {
+		m.addPoint(p);
+	}
+
+	public void resetClicked() {
+		m.clearAllPoints();
+	}
+
+	public void undoClicked() {
+		m.deleteLastPoint();
+	}
+}

lab/lab13/Question1/Model.java

@@ -0,0 +1,106 @@
+import java.awt.Point;
+import java.util.ArrayList;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+public class Model {
+	private ArrayList<Point> points;
+	private ArrayList<ModelListener> listeners;
+
+	public Model() {
+		points = new ArrayList<Point>();
+		listeners = new ArrayList<ModelListener>();
+
+		if (new java.io.File("points.bin").exists()) {
+			try {
+				FileInputStream fi = new FileInputStream("points.bin");
+				ObjectInputStream in = new ObjectInputStream(fi);
+				points = (ArrayList<Point>) in.readObject();
+				in.close();
+				fi.close();
+			} catch (IOException e) {
+				System.err.println(e.getMessage());
+				System.exit(1);
+			} catch (ClassNotFoundException e) {
+				System.err.println(e.getMessage());
+				System.exit(1);
+			}
+		}
+	}
+
+	public void addListener(ModelListener l) {
+		listeners.add(l);
+	}
+
+	public ArrayList<Point> getPoints() {
+		return points;
+	}
+
+	public void addPoint(Point p) {
+		points.add(p);
+		notifyListeners();
+	}
+
+	public void clearAllPoints() {
+		points.clear();
+		notifyListeners();
+	}
+
+	public void deleteLastPoint() {
+		if (points.size() > 0) {
+			points.remove(points.size() - 1);
+			notifyListeners();
+		}
+	}
+
+	private void notifyListeners() {
+		for (ModelListener l : listeners) {
+			l.update();
+		}
+	}
+
+	public int numberOfPoints() {
+		return points.size();
+	}
+
+	public void saveData() {
+
+		try {
+			FileOutputStream f = new FileOutputStream("points.bin");
+			ObjectOutputStream out = new ObjectOutputStream(f);
+			out.writeObject(points);
+			out.close();
+			f.close();
+		} catch (IOException e) {
+			System.err.println(e.getMessage());
+			System.exit(254);
+		}
+	}
+
+	public static void testModel() {
+		Model m = new Model();
+		m.addListener(new ModelListener() {
+			@Override
+			public void update() {
+				System.out.println(true + " (listener)");
+			}
+		});
+		System.out.println(m.getPoints() == m.points);
+		Point p1 = new Point(1, 2);
+		Point p2 = new Point(3, 4);
+		m.addPoint(p1);
+		m.addPoint(p2);
+		System.out.println(m.numberOfPoints() == 2);
+		System.out.println(m.points.get(0) == p1);
+		System.out.println(m.points.get(1) == p2);
+		m.deleteLastPoint();
+		System.out.println(m.numberOfPoints() == 1);
+		System.out.println(m.points.get(0) == p1);
+		m.clearAllPoints();
+		System.out.println(m.numberOfPoints() == 0);
+		m.notifyListeners();
+	}
+}

lab/lab13/Question1/ModelListener.java

@@ -0,0 +1,3 @@
+public interface ModelListener {
+	public void update();
+}

lab/lab13/Question1/MyFrame.java

@@ -0,0 +1,55 @@
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.JButton;
+import javax.swing.JPanel;
+
+public class MyFrame extends View<ControllerClicks> {
+
+	public MyFrame(Model m, ControllerClicks c) {
+		super(m, c);
+		this.setTitle("MyFrame Title");
+		this.setSize(400, 300);
+		this.setLocationRelativeTo(null);
+		this.setLayout(new BorderLayout());
+
+		// layout
+
+		MyPanel centerPanel = new MyPanel(m, c);
+		this.add(centerPanel, BorderLayout.CENTER);
+
+		JPanel topPanel = new JPanel();
+		this.add(topPanel, BorderLayout.PAGE_START);
+
+		// top panel
+		topPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
+
+		JButton resetButton = new JButton("Reset");
+		resetButton.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				c.resetClicked();
+			}
+		});
+
+		JButton undoButton = new JButton("Undo");
+		undoButton.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				c.undoClicked();
+			}
+		});
+
+		topPanel.add(resetButton);
+		topPanel.add(undoButton);
+
+		// final
+		this.setVisible(true);
+	}
+
+	@Override
+	public void update() {
+		repaint();
+	}
+}

lab/lab13/Question1/MyPanel.java

@@ -0,0 +1,49 @@
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Point;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.ArrayList;
+import javax.swing.JPanel;
+
+public class MyPanel extends JPanel {
+
+	private Model m;
+	private ControllerClicks c;
+
+	public MyPanel(Model m, ControllerClicks c) {
+		this.m = m;
+		this.c = c;
+
+		this.addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				if (e.getButton() == MouseEvent.BUTTON1) {
+					c.mouseClicked(e.getPoint());
+				}
+			}
+		});
+	}
+
+	@Override
+	protected void paintComponent(Graphics g) {
+
+		// Draw the background
+		super.paintComponent(g);
+		// Draw the grid
+		ArrayList<Point> points = m.getPoints();
+		g.setColor(Color.RED);
+		// Draw the points
+		if (points.size() == 1) {
+			Point p = points.get(0);
+			g.drawRect((int) p.getX(), (int) p.getY(), 1, 1);
+		} else {
+			// Draw the lines
+			for (int i = 1; i < points.size(); i++) {
+				Point start = points.get(i - 1);
+				Point end = points.get(i);
+				g.drawLine((int) start.getX(), (int) start.getY(), (int) end.getX(), (int) end.getY());
+			}
+		}
+	}
+}

lab/lab13/Question1/Start.java

@@ -0,0 +1,14 @@
+public class Start {
+	public static void main(String[] args) {
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				Model model = new Model();
+				ControllerClicks c1 = new ControllerClicks(model);
+				MyFrame frame = new MyFrame(model, c1);
+				Controller c2 = new Controller(model);
+				ViewNumber vn = new ViewNumber(model, c2);
+			}
+		});
+	}
+}

lab/lab13/Question1/Test.java

@@ -0,0 +1,5 @@
+public class Test {
+	public static void main(String[] args) {
+		Model.testModel();
+	}
+}

lab/lab13/Question1/View.java

@@ -0,0 +1,22 @@
+import javax.swing.JFrame;
+
+public abstract class View<T extends Controller> extends JFrame implements ModelListener {
+
+	protected Model m;
+	protected T c;
+
+	public View(Model m, T c) {
+		this.m = m;
+		this.c = c;
+		m.addListener(this);
+		setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); // hide the frame when the user clicks on the close button
+		addWindowListener(new java.awt.event.WindowAdapter() {
+			public void windowClosing(java.awt.event.WindowEvent e) {
+				c.shutdown();
+			}
+		});
+	}
+
+	@Override
+	public abstract void update();
+}

lab/lab13/Question1/ViewNumber.java

@@ -0,0 +1,21 @@
+import javax.swing.JLabel;
+
+public class ViewNumber extends View<Controller> {
+
+	private JLabel label;
+
+	public ViewNumber(Model m, Controller c) {
+		super(m, c);
+		this.setTitle("View Number");
+		this.setSize(150, 150);
+		label = new JLabel();
+		update();
+		this.add(label);
+		this.setVisible(true);
+	}
+
+	@Override
+	public void update() {
+		label.setText("Number of points is: " + m.numberOfPoints());
+	}
+}

lab/lab13/Question2/Controller.java

@@ -0,0 +1,12 @@
+public class Controller {
+	protected Model m;
+
+	public Controller(Model m) {
+		this.m = m;
+	}
+
+	protected void shutdown() {
+		m.saveData();
+		System.exit(0);
+	}
+}

lab/lab13/Question2/ControllerClicks.java

@@ -0,0 +1,19 @@
+import java.awt.Point;
+
+public class ControllerClicks extends Controller {
+	public ControllerClicks(Model m) {
+		super(m);
+	}
+
+	public void mouseClicked(Point p) {
+		m.addPoint(p);
+	}
+
+	public void resetClicked() {
+		m.clearAllPoints();
+	}
+
+	public void undoClicked() {
+		m.deleteLastPoint();
+	}
+}

lab/lab13/Question2/Model.java

@@ -0,0 +1,109 @@
+import java.awt.Point;
+import java.util.ArrayList;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+public class Model {
+	private ArrayList<Point> points;
+	private ArrayList<ModelListener> listeners;
+
+	/**
+	 * Constructor
+	 */
+	public Model() {
+		points = new ArrayList<Point>();
+		listeners = new ArrayList<ModelListener>();
+		if (new java.io.File("points.bin").exists()) {
+			// load points from file
+			try {
+				FileInputStream fi = new FileInputStream("points.bin");
+				ObjectInputStream in = new ObjectInputStream(fi);
+				points = (ArrayList<Point>) in.readObject();
+				in.close();
+				fi.close();
+			} catch (IOException e) {
+				System.err.println(e.getMessage());
+				System.exit(1);
+			} catch (ClassNotFoundException e) {
+				System.err.println(e.getMessage());
+				System.exit(1);
+			}
+		}
+	}
+
+	public void addListener(ModelListener l) {
+		listeners.add(l);
+	}
+
+	public ArrayList<Point> getPoints() {
+		return points;
+	}
+
+	public void addPoint(Point p) {
+		points.add(p);
+		notifyListeners();
+	}
+
+	public void clearAllPoints() {
+		points.clear();
+		notifyListeners();
+	}
+
+	public void deleteLastPoint() {
+		if (points.size() > 0) {
+			points.remove(points.size() - 1);
+			notifyListeners();
+		}
+	}
+
+	private void notifyListeners() {
+		for (ModelListener l : listeners) {
+			l.update();
+		}
+	}
+
+	public int numberOfPoints() {
+		return points.size();
+	}
+
+	public void saveData() {
+		try {
+			// save points to file
+			FileOutputStream fo = new FileOutputStream("points.bin");
+			ObjectOutputStream out = new ObjectOutputStream(fo);
+			out.writeObject(points);
+			out.close();
+			fo.close();
+		} catch (IOException e) {
+			System.err.println(e.getMessage());
+			System.exit(1);
+		}
+	}
+
+	public static void testModel() {
+		Model m = new Model();
+		m.addListener(new ModelListener() {
+			@Override
+			public void update() {
+				System.out.println(true + " (listener)");
+			}
+		});
+		System.out.println(m.getPoints() == m.points);
+		Point p1 = new Point(1, 2);
+		Point p2 = new Point(3, 4);
+		m.addPoint(p1);
+		m.addPoint(p2);
+		System.out.println(m.numberOfPoints() == 2);
+		System.out.println(m.points.get(0) == p1);
+		System.out.println(m.points.get(1) == p2);
+		m.deleteLastPoint();
+		System.out.println(m.numberOfPoints() == 1);
+		System.out.println(m.points.get(0) == p1);
+		m.clearAllPoints();
+		System.out.println(m.numberOfPoints() == 0);
+		m.notifyListeners();
+	}
+}

lab/lab13/Question2/ModelListener.java

@@ -0,0 +1,3 @@
+public interface ModelListener {
+	public void update();
+}

lab/lab13/Question2/MyFrame.java

@@ -0,0 +1,53 @@
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.JButton;
+import javax.swing.JPanel;
+
+public class MyFrame extends View<ControllerClicks> {
+
+	public MyFrame(Model m, ControllerClicks c) {
+		super(m, c);
+
+		this.setTitle("MyFrame Title");
+		this.setSize(400, 300);
+		this.setLocationRelativeTo(null);
+		this.setLayout(new BorderLayout());
+
+		MyPanel centerPanel = new MyPanel(m, c);
+		this.add(centerPanel, BorderLayout.CENTER);
+
+		JPanel topPanel = new JPanel();
+		this.add(topPanel, BorderLayout.PAGE_START);
+
+		topPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
+		JButton resetButton = new JButton("Reset");
+		resetButton.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				c.resetClicked();
+			}
+		});
+
+		topPanel.add(resetButton);
+		JButton undoButton = new JButton("Undo");
+
+		undoButton.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				c.undoClicked();
+			}
+		});
+
+		topPanel.add(undoButton);
+
+		// final
+		this.setVisible(true);
+	}
+
+	@Override
+	public void update() {
+		repaint();
+	}
+}

lab/lab13/Question2/MyPanel.java

@@ -0,0 +1,44 @@
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Point;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.ArrayList;
+import javax.swing.JPanel;
+
+public class MyPanel extends JPanel {
+	private Model m;
+	private ControllerClicks c;
+
+	public MyPanel(Model m, ControllerClicks c) {
+		this.m = m;
+		this.c = c;
+
+		// add mouse listener
+		this.addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				if (e.getButton() == MouseEvent.BUTTON1) {
+					c.mouseClicked(e.getPoint());
+				}
+			}
+		});
+	}
+
+	@Override
+	protected void paintComponent(Graphics g) {
+		super.paintComponent(g);
+		ArrayList<Point> points = m.getPoints();
+		g.setColor(Color.RED);
+		if (points.size() == 1) {
+			Point p = points.get(0);
+			g.drawRect((int) p.getX(), (int) p.getY(), 1, 1);
+		} else {
+			for (int i = 1; i < points.size(); i++) {
+				Point start = points.get(i - 1);
+				Point end = points.get(i);
+				g.drawLine((int) start.getX(), (int) start.getY(), (int) end.getX(), (int) end.getY());
+			}
+		}
+	}
+}

lab/lab13/Question2/Start.java

@@ -0,0 +1,14 @@
+public class Start {
+	public static void main(String[] args) {
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				Model model = new Model();
+				ControllerClicks c1 = new ControllerClicks(model);
+				MyFrame frame = new MyFrame(model, c1);
+				Controller c2 = new Controller(model);
+				ViewNumber vn = new ViewNumber(model, c2);
+			}
+		});
+	}
+}

lab/lab13/Question2/Test.java

@@ -0,0 +1,5 @@
+public class Test {
+	public static void main(String[] args) {
+		Model.testModel();
+	}
+}

lab/lab13/Question2/View.java

@@ -0,0 +1,23 @@
+import javax.swing.JFrame;
+
+public abstract class View<T extends Controller> extends JFrame implements ModelListener {
+	protected Model m;
+	protected T c;
+
+	public View(Model m, T c) {
+		this.m = m;
+		this.c = c;
+
+		m.addListener(this);
+		setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
+
+		addWindowListener(new java.awt.event.WindowAdapter() {
+			public void windowClosing(java.awt.event.WindowEvent e) {
+				c.shutdown();
+			}
+		});
+	}
+
+	@Override
+	public abstract void update();
+}

lab/lab13/Question2/ViewNumber.java

@@ -0,0 +1,21 @@
+import javax.swing.JLabel;
+
+public class ViewNumber extends View<Controller> {
+
+	private JLabel label;
+
+	public ViewNumber(Model m, Controller c) {
+		super(m, c);
+		this.setTitle("View Number");
+		this.setSize(150, 150);
+		label = new JLabel();
+		update();
+		this.add(label);
+		this.setVisible(true);
+	}
+
+	@Override
+	public void update() {
+		label.setText("Number of points is: " + m.numberOfPoints());
+	}
+}

lab/lab13/Question3/Controller.java

@@ -0,0 +1,15 @@
+public class Controller {
+	protected Model m;
+
+	public Controller(Model m) {
+		this.m = m;
+	}
+
+	/**
+	 * Gracefully exits the program.
+	 */
+	protected void shutdown() {
+		m.saveData();
+		System.exit(0);
+	}
+}

lab/lab13/Question3/ControllerClicks.java

@@ -0,0 +1,19 @@
+import java.awt.Point;
+
+public class ControllerClicks extends Controller {
+	public ControllerClicks(Model m) {
+		super(m);
+	}
+
+	public void mouseClicked(Point p) {
+		m.addPoint(p);
+	}
+
+	public void resetClicked() {
+		m.clearAllPoints();
+	}
+
+	public void undoClicked() {
+		m.deleteLastPoint();
+	}
+}

lab/lab13/Question3/Model.java

@@ -0,0 +1,104 @@
+import java.awt.Point;
+import java.util.ArrayList;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class Model {
+	private ArrayList<Point> points;
+	private ArrayList<ModelListener> listeners;
+
+	public Model() {
+		points = new ArrayList<Point>();
+		listeners = new ArrayList<ModelListener>();
+		// msw-sh wg. DB-Verbindung
+		try (Connection conn = DriverManager.getConnection("jdbc:mysql://msw-sh.local:3306/java", "hmsy",
+				"woshimima");
+				Statement stmt = conn.createStatement();) {
+			ResultSet rs = stmt.executeQuery("SELECT * FROM points");
+			while (rs.next()) {
+				points.add(new Point(rs.getInt("x"), rs.getInt("y")));
+			}
+		} catch (SQLException e) {
+			System.err.println(e.getMessage());
+			System.exit(1);
+		}
+	}
+
+	public void addListener(ModelListener l) {
+		listeners.add(l);
+	}
+
+	public ArrayList<Point> getPoints() {
+		return points;
+	}
+
+	public void addPoint(Point p) {
+		points.add(p);
+		notifyListeners();
+	}
+
+	public void clearAllPoints() {
+		points.clear();
+		notifyListeners();
+	}
+
+	public void deleteLastPoint() {
+		if (points.size() > 0) {
+			points.remove(points.size() - 1);
+			notifyListeners();
+		}
+	}
+
+	private void notifyListeners() {
+		for (ModelListener l : listeners) {
+			l.update();
+		}
+	}
+
+	public int numberOfPoints() {
+		return points.size();
+	}
+
+	// save to DB
+	public void saveData() {
+		try (Connection conn = DriverManager.getConnection("jdbc:mysql://msw-sh.local:3306/java", "hmsy",
+				"woshimima");
+				Statement stmt = conn.createStatement();) {
+			// delete all points
+			stmt.executeUpdate("DELETE FROM points");
+			for (Point p : points) {
+				stmt.executeUpdate("INSERT INTO points (x, y) VALUES (" + p.x + ", " + p.y + ")");
+			}
+		} catch (SQLException e) {
+			System.err.println(e.getMessage());
+			System.exit(2);
+		}
+	}
+
+	public static void testModel() {
+		Model m = new Model();
+		m.addListener(new ModelListener() {
+			@Override
+			public void update() {
+				System.out.println(true + " (listener)");
+			}
+		});
+		System.out.println(m.getPoints() == m.points);
+		Point p1 = new Point(1, 2);
+		Point p2 = new Point(3, 4);
+		m.addPoint(p1); // Listener called.
+		m.addPoint(p2); // Listener called.
+		System.out.println(m.numberOfPoints() == 2);
+		System.out.println(m.points.get(0) == p1);
+		System.out.println(m.points.get(1) == p2);
+		m.deleteLastPoint(); // Listener called.
+		System.out.println(m.numberOfPoints() == 1);
+		System.out.println(m.points.get(0) == p1);
+		m.clearAllPoints(); // Listener called.
+		System.out.println(m.numberOfPoints() == 0);
+		m.notifyListeners(); // Listener called.
+	}
+}

lab/lab13/Question3/ModelListener.java

@@ -0,0 +1,3 @@
+public interface ModelListener {
+	public void update();
+}

lab/lab13/Question3/MyFrame.java

@@ -0,0 +1,51 @@
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.JButton;
+import javax.swing.JPanel;
+
+public class MyFrame extends View<ControllerClicks> {
+	public MyFrame(Model m, ControllerClicks c) {
+		super(m, c);
+		this.setTitle("MyFrame Title");
+		this.setSize(400, 300);
+		this.setLocationRelativeTo(null);
+		this.setLayout(new BorderLayout());
+
+		MyPanel centerPanel = new MyPanel(m, c);
+		this.add(centerPanel, BorderLayout.CENTER);
+
+		JPanel topPanel = new JPanel();
+		this.add(topPanel, BorderLayout.PAGE_START);
+		
+		topPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
+
+		JButton resetButton = new JButton("Reset");
+		resetButton.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				c.resetClicked();
+			}
+		});
+
+		topPanel.add(resetButton);
+		JButton undoButton = new JButton("Undo");
+		undoButton.addActionListener(new ActionListener() {
+			@Override
+			public void actionPerformed(ActionEvent e) {
+				c.undoClicked();
+			}
+		});
+
+		topPanel.add(undoButton);
+
+		// final
+		this.setVisible(true);
+	}
+
+	@Override
+	public void update() {
+		repaint();
+	}
+}

lab/lab13/Question3/MyPanel.java

@@ -0,0 +1,42 @@
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Point;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.ArrayList;
+import javax.swing.JPanel;
+
+public class MyPanel extends JPanel {
+	private Model m;
+	private ControllerClicks c;
+
+	public MyPanel(Model m, ControllerClicks c) {
+		this.m = m;
+		this.c = c;
+		this.addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				if (e.getButton() == MouseEvent.BUTTON1) {
+					c.mouseClicked(e.getPoint());
+				}
+			}
+		});
+	}
+
+	@Override
+	protected void paintComponent(Graphics g) {
+		super.paintComponent(g);
+		ArrayList<Point> points = m.getPoints();
+		g.setColor(Color.RED);
+		if (points.size() == 1) {
+			Point p = points.get(0);
+			g.drawRect((int) p.getX(), (int) p.getY(), 1, 1);
+		} else {
+			for (int i = 1; i < points.size(); i++) {
+				Point start = points.get(i - 1);
+				Point end = points.get(i);
+				g.drawLine((int) start.getX(), (int) start.getY(), (int) end.getX(), (int) end.getY());
+			}
+		}
+	}
+}

lab/lab13/Question3/Start.java

@@ -0,0 +1,14 @@
+public class Start {
+	public static void main(String[] args) {
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				Model model = new Model();
+				ControllerClicks c1 = new ControllerClicks(model);
+				MyFrame frame = new MyFrame(model, c1);
+				Controller c2 = new Controller(model);
+				ViewNumber vn = new ViewNumber(model, c2);
+			}
+		});
+	}
+}

lab/lab13/Question3/Test.java

@@ -0,0 +1,5 @@
+public class Test {
+	public static void main(String[] args) {
+		Model.testModel();
+	}
+}

lab/lab13/Question3/View.java

@@ -0,0 +1,21 @@
+import javax.swing.JFrame;
+
+public abstract class View<T extends Controller> extends JFrame implements ModelListener {
+	protected Model m;
+	protected T c;
+
+	public View(Model m, T c) {
+		this.m = m;
+		this.c = c;
+		m.addListener(this);
+		setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
+		addWindowListener(new java.awt.event.WindowAdapter() {
+			public void windowClosing(java.awt.event.WindowEvent e) {
+				c.shutdown();
+			}
+		});
+	}
+
+	@Override
+	public abstract void update();
+}

lab/lab13/Question3/ViewNumber.java

@@ -0,0 +1,20 @@
+import javax.swing.JLabel;
+
+public class ViewNumber extends View<Controller> {
+	private JLabel label;
+
+	public ViewNumber(Model m, Controller c) {
+		super(m, c);
+		this.setTitle("View Number");
+		this.setSize(150, 150);
+		label = new JLabel();
+		update();
+		this.add(label);
+		this.setVisible(true);
+	}
+
+	@Override
+	public void update() {
+		label.setText("Number of points is: " + m.numberOfPoints());
+	}
+}