initial commit

MANIFEST.MF

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+Main-Class: ElevatorApplication

Makefile

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+all: build assemble
+
+.PHONY: build
+build:
+	mkdir -p build
+	javac -Xlint src/*.java -d build
+
+assemble:
+	cd build/; jar cvmf ../MANIFEST.MF ../Elevator.jar *.class
+
+clean:
+	-rm build/*.class

src/Direction.java

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+public enum Direction {
+    NONE,
+    UP,
+    DOWN,
+}

src/Elevator.java

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+public class Elevator {
+	private int currentFloor = 0;
+	private boolean betweenFloors = false; /* Between currentFloor and the one above it. */
+	private Direction direction = Direction.NONE;
+	private boolean stoppingNextFloor = false;
+	private boolean emergency = false;
+
+	public Elevator(int currentFloor) {
+		this.currentFloor = currentFloor;
+	}
+
+	public void goUp() {
+		if (emergency) return;
+		stoppingNextFloor = false;
+		direction = Direction.UP;
+	}
+
+	public void goDown() {
+		if (emergency) return;
+		stoppingNextFloor = false;
+		direction = Direction.DOWN;
+	}
+
+	public void stopElevator() {
+		direction = Direction.NONE;
+	}
+
+	public void stopNextFloor() {
+		stoppingNextFloor = true;
+	}
+
+	public void emergencyStop() {
+		emergency = true;
+		direction = Direction.NONE;
+	}
+
+	public void cancelEmergency() {
+		emergency = false;
+	}
+
+	public void move() {
+		if (emergency) return;
+		switch (direction) {
+		case DOWN:
+			/* Go halfway below. */
+			if (!betweenFloors) currentFloor--;
+			betweenFloors = !betweenFloors;
+			break;
+		case UP:
+			/* Go halfway above. */
+			if (betweenFloors) currentFloor++;
+			betweenFloors = !betweenFloors;
+			break;
+		default:
+			break;
+		}
+	}
+
+	public int getCurrentFloor() {
+		return currentFloor;
+	}
+
+	public boolean getBetweenFloors() {
+		return betweenFloors;
+	}
+
+	public Direction getDirection() {
+		return direction;
+	}
+}

src/ElevatorApplication.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+
+public class ElevatorApplication implements ActionListener {
+    private ElevatorCanvas canvas;
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+		canvas.setElevatorY((canvas.getElevatorY() + 1) % canvas.getHeight());
+    }
+
+    private void createAndShowGUI() {
+		JFrame frame = new JFrame();
+		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		Container pane = frame.getContentPane();
+		pane.setLayout(new BoxLayout(pane, BoxLayout.LINE_AXIS));
+
+		pane.add(Box.createHorizontalGlue());
+
+		canvas = new ElevatorCanvas();
+		canvas.setAlignmentY(Component.TOP_ALIGNMENT);
+		pane.add(canvas);
+
+		FloorPanels fp = new FloorPanels(5);
+		fp.setAlignmentY(Component.TOP_ALIGNMENT);
+		pane.add(fp);
+
+		pane.add(Box.createRigidArea(new Dimension(20, 0)));
+
+		ElevatorPanel elevatorPanel = new ElevatorPanel(5);
+		elevatorPanel.setAlignmentY(Component.TOP_ALIGNMENT);
+		pane.add(elevatorPanel);
+
+		pane.add(Box.createHorizontalGlue());
+
+		frame.pack();
+		frame.setVisible(true);
+    }
+
+    public static void main(String[] args) {
+		ElevatorApplication app = new ElevatorApplication();
+		SwingUtilities.invokeLater(new Runnable() {
+				public void run() {
+					app.createAndShowGUI();
+					Timer t = new Timer(16, app);
+					t.start();
+				}
+			});
+    }
+}

src/ElevatorCanvas.java

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+import javax.swing.*;
+import java.awt.*;
+
+
+class ElevatorCanvas extends JPanel {
+	private final static int WIDTH = 40;
+	private final static int HEIGHT = 50;
+	private final static Color COLOR = Color.PINK;
+	private final static Dimension DIMENSIONS = new Dimension(WIDTH, 200);
+
+    private int y = 0;
+
+    @Override
+    public Dimension getMinimumSize() {
+		return DIMENSIONS;
+    }
+    @Override
+    public Dimension getPreferredSize() {
+		return DIMENSIONS;
+    }
+    @Override
+    public Dimension getMaximumSize() {
+		return DIMENSIONS;
+    }
+
+    @Override
+    public void paintComponent(Graphics g) {
+		super.paintComponent(g);
+		g.setColor(COLOR);
+		g.fillRect(0, y, WIDTH, HEIGHT);
+    }
+
+    public void setElevatorY(int y) {
+		this.y = y;
+		repaint();
+    }
+
+    public int getElevatorY() {
+		return y;
+    }
+}

src/ElevatorPanel.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+
+class ElevatorPanel extends JPanel {
+	private JButton emergencyStop = new JButton("Emergency stop.");
+	private JButton[] buttons;
+
+	public ElevatorPanel(int nbFloors) {
+		this.setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
+		this.add(new JLabel("Elevator panel."));
+
+		buttons = new JButton[nbFloors];
+		for (int i = 0; i < nbFloors; i++) {
+			buttons[i] = new JButton("" + i);
+			this.add(buttons[i]);
+		}
+		add(emergencyStop);
+	}
+
+	public void addEmergencyStopListener(ActionListener l) {
+		emergencyStop.addActionListener(l);
+	}
+}

src/FloorPanels.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+
+class FloorPanels extends JPanel {
+	private int nbFloors;
+	private JPanel[] floors;
+
+	public FloorPanels(int nbFloors) {
+		this.nbFloors = nbFloors;
+		floors = new JPanel[nbFloors];
+		this.setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
+		this.add(new JLabel("Call."));
+		for (int i = 0; i < nbFloors; i++) {
+			floors[i] = new JPanel();
+			floors[i].setLayout(new BoxLayout(floors[i], BoxLayout.LINE_AXIS));
+			floors[i].add(new JLabel("" + (i + 1)));
+			floors[i].add(new JButton("↑"));
+			floors[i].add(new JButton("↓"));
+			this.add(floors[i]);
+		}
+	}
+}