Simplify and document vibration pattern logic.
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@@ -380,7 +380,7 @@ public class GameActivity extends SDLActivity {
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public static void vibrate (int period, int duration) {
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if (vibrator == null || !vibrator.hasVibrator ()) {
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if (vibrator == null || !vibrator.hasVibrator () || period < 0 || duration <= 0) {
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return;
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@@ -400,8 +400,9 @@ public class GameActivity extends SDLActivity {
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} else {
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int periodMS = Math.max (1, (int)Math.ceil (period / 2.0));
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int count = Math.max (1, (int)Math.ceil ((duration / (double) period) * 2));
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// each period has two halves (vibrator off/vibrator on), and each half requires a separate entry in the array
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int periodMS = (int)Math.ceil (period / 2.0);
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int count = (int)Math.ceil (duration / (double) periodMS);
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long[] pattern = new long[count];
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for (int i = 0; i < count; i++) {
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