P6-P15: init

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

P8.java

@@ -0,0 +1,84 @@
+import java.applet.Applet;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.util.Calendar;
+
+public class P8 extends Applet implements Runnable {
+    Thread t = null;
+    boolean threadSuspended;
+    int hours = 0, minutes = 0, seconds = 0;
+
+    public void init() {
+        setBackground(Color.white);
+    }
+
+    public void start() {
+        if (threadSuspended) {
+            threadSuspended = false;
+            synchronized (this) {
+                notify();
+            }
+        }
+
+        if (t == null) {
+            t = new Thread(this);
+            threadSuspended = false;
+            t.start();
+        }
+    }
+
+    public void stop() {
+        threadSuspended = true;
+    }
+
+    public void run() {
+        try {
+            while (true) {
+                Calendar cal = Calendar.getInstance();
+                hours = cal.get(Calendar.HOUR_OF_DAY) % 12;
+                if (hours == 0)
+                    hours += 1;
+                minutes = cal.get(Calendar.MINUTE);
+                seconds = cal.get(Calendar.SECOND);
+
+                repaint();
+                Thread.sleep(1000);
+                if (threadSuspended) {
+                    synchronized (this) {
+                        while (threadSuspended)
+                            wait();
+                    }
+                }
+            }
+        } catch (InterruptedException e) {
+            System.out.println("Process interrupted");
+        }
+    }
+
+    void drawHand(double angle, int radius, Graphics g) {
+        angle -= 0.5 * Math.PI;
+        int x = (int) (radius * Math.cos(angle));
+        int y = (int) (radius * Math.sin(angle));
+        g.drawLine(getWidth() / 2, getHeight() / 2, getWidth() / 2 + x, getHeight() / 2 + y);
+    }
+
+    public void paint(Graphics g) {
+        int radius = Math.min(getWidth(), getHeight()) / 2 - 10;
+        g.setColor(Color.blue);
+        g.drawOval(getWidth() / 2 - radius, getHeight() / 2 - radius, 2 * radius, 2 * radius);
+
+        g.setColor(Color.black);
+        g.fillOval(getWidth() / 2 - 5, getHeight() / 2 - 5, 10, 10);
+
+        double hourAngle = (hours + minutes / 60.0) * (2 * Math.PI / 12) - 0.5 * Math.PI;
+        double minuteAngle = (minutes + seconds / 60.0) * (2 * Math.PI / 60) - 0.5 * Math.PI;
+        double secondAngle = (seconds * 2 * Math.PI / 60) - 0.5 * Math.PI;
+
+        g.setColor(Color.black);
+        drawHand(hourAngle, radius / 2, g);
+        g.setColor(Color.gray);
+        drawHand(minuteAngle, (int) (0.8 * radius), g);
+        g.setColor(Color.red);
+        drawHand(secondAngle, (int) (0.9 * radius), g);
+    }
+}