2016 Update

Task/Honeycombs/Java/honeycombs.java

@@ -0,0 +1,131 @@
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+public class Honeycombs extends JFrame {
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            JFrame f = new Honeycombs();
+            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+            f.setVisible(true);
+        });
+    }
+
+    public Honeycombs() {
+        add(new HoneycombsPanel(), BorderLayout.CENTER);
+        setTitle("Honeycombs");
+        setResizable(false);
+        pack();
+        setLocationRelativeTo(null);
+    }
+}
+
+class HoneycombsPanel extends JPanel {
+
+    Hexagon[] comb;
+
+    public HoneycombsPanel() {
+        setPreferredSize(new Dimension(600, 500));
+        setBackground(Color.white);
+        setFocusable(true);
+
+        addMouseListener(new MouseAdapter() {
+            @Override
+            public void mousePressed(MouseEvent e) {
+                for (Hexagon hex : comb)
+                    if (hex.contains(e.getX(), e.getY())) {
+                        hex.setSelected();
+                        break;
+                    }
+                repaint();
+            }
+        });
+
+        addKeyListener(new KeyAdapter() {
+            @Override
+            public void keyPressed(KeyEvent e) {
+                for (Hexagon hex : comb)
+                    if (hex.letter == Character.toUpperCase(e.getKeyChar())) {
+                        hex.setSelected();
+                        break;
+                    }
+                repaint();
+            }
+        });
+
+        char[] letters = "LRDGITPFBVOKANUYCESM".toCharArray();
+        comb = new Hexagon[20];
+
+        int x1 = 150, y1 = 100, x2 = 225, y2 = 143, w = 150, h = 87;
+        for (int i = 0; i < comb.length; i++) {
+            int x, y;
+            if (i < 12) {
+                x = x1 + (i % 3) * w;
+                y = y1 + (i / 3) * h;
+            } else {
+                x = x2 + (i % 2) * w;
+                y = y2 + ((i - 12) / 2) * h;
+            }
+            comb[i] = new Hexagon(x, y, w / 3, letters[i]);
+        }
+
+        requestFocus();
+    }
+
+    @Override
+    public void paintComponent(Graphics gg) {
+        super.paintComponent(gg);
+        Graphics2D g = (Graphics2D) gg;
+        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+                RenderingHints.VALUE_ANTIALIAS_ON);
+
+        g.setFont(new Font("SansSerif", Font.BOLD, 30));
+        g.setStroke(new BasicStroke(3));
+
+        for (Hexagon hex : comb)
+            hex.draw(g);
+    }
+}
+
+class Hexagon extends Polygon {
+    final Color baseColor = Color.yellow;
+    final Color selectedColor = Color.magenta;
+    final char letter;
+
+    private boolean hasBeenSelected;
+
+    Hexagon(int x, int y, int halfWidth, char c) {
+        letter = c;
+        for (int i = 0; i < 6; i++)
+            addPoint((int) (x + halfWidth * Math.cos(i * Math.PI / 3)),
+                     (int) (y + halfWidth * Math.sin(i * Math.PI / 3)));
+        getBounds();
+    }
+
+    void setSelected() {
+        hasBeenSelected = true;
+    }
+
+    void draw(Graphics2D g) {
+        g.setColor(hasBeenSelected ? selectedColor : baseColor);
+        g.fillPolygon(this);
+
+        g.setColor(Color.black);
+        g.drawPolygon(this);
+
+        g.setColor(hasBeenSelected ? Color.black : Color.red);
+        drawCenteredString(g, String.valueOf(letter));
+    }
+
+    void drawCenteredString(Graphics2D g, String s) {
+        FontMetrics fm = g.getFontMetrics();
+        int asc = fm.getAscent();
+        int dec = fm.getDescent();
+
+        int x = bounds.x + (bounds.width - fm.stringWidth(s)) / 2;
+        int y = bounds.y + (asc + (bounds.height - (asc + dec)) / 2);
+
+        g.drawString(s, x, y);
+    }
+}