//--// name: Smacking.ck// desc: class and process for tracking smack events from sudden motion sensor//       only works with SMS-enabled laptops//// author: Rebecca Fiebrink + Ge Wang// date: 2007//--  // public classpublic class Smacking{    static Event @ the_event;} // initialize separately (due to a bug)new Event @=> Smacking.the_event; // smack detection threshold (less -> more sensitive)15 => int threshold;// pol rate.01::second => dur poll_rate;// recover time (after smack detection).10::second => dur recover_time; // instantiate a Hid objectHid hi;HidMsg msg; // open tilt sensorif( !hi.openTiltSensor() ){    <<< "tilt sensor unavailable", "" >>>;    me.exit();} // "doh"<<< "hit me!", "" >>>; // rememberHidMsg last;// initializehi.read( 9, 0, last ); // infinite event loopwhile( true ){    // poll the tilt sensor, expect to get back 3 element array of ints    hi.read( 9, 0, msg );        // compute difference    (Math.abs(msg.x - last.x) + Math.abs(msg.y - last.y) + Math.abs(msg.z - last.z)) => int diff;    // check threshold    if (diff > threshold) {        // smack detected!        // <<< "ouch!" >>>;        // fire!        Smacking.the_event.broadcast();        // go        recover_time => now;    } else {        // uncomment the following to dynamically calibrate the smack sensor        // msg.x => last.x;    	    	        // msg.y => last.y;        // msg.z => last.z;                // advance        poll_rate => now;    }}