// Screen Knock Version 1
// October 1, 2008
// by Chris Stones
// http://www.welcometochrisworld.com
//
// One of the few programs I pretty much wrote from skratch.
// Special thanks to the SMS Lib though by Daniel Shiffman and others
// Note: Spaces on Mac OS 10.5 needs to be set to use
//       Command + Arrow Keys for this program to work.
//       * For best performance customize
//         KNOCK and wait_for_shake to your system.
//         as in ... you know, use trail and error values until you get it right.

// I had always acted out like I was knocking my laptop
// from one space to the next. But I finally sat down and made
// it do it by itself.

import java.awt.Robot;
import java.awt.event.KeyEvent;
import sms.*;  // Sudden motion detection

Robot robot;
int[] init_vals;
int[] vals;
int KNOCK;
int wait_for_shake;
boolean wait;
int wait_cnt;

int X,Y,Z; // calculated thresholds

void setup() {
 size(100,100);
 frameRate(20);
 wait = false;
 wait_cnt = 0;
 wait_for_shake = 15; // wait for shaking to stop (number/frames = seconds of waiting)
 KNOCK = 15;          // How big of a jolt before you want to move the screen
 try {
   robot = new Robot();
 }
 catch (Exception e) {
   println("robot Can not be created.");
   exit();
 }

 // Opening values don't start at zero.
 // So we need to collect values at 'rest'
 init_vals = Unimotion.getSMSArray();

 X = init_vals[0];
 Y = init_vals[1];
 Z = init_vals[2];
}


void draw() {
 // Read Sudden Motion Sensor
 int[] vals = Unimotion.getSMSArray();

 // Reset wait count to allow another jolt
 if( wait_cnt == wait_for_shake) {
   wait = false;
   wait_cnt = 0;
 }

 // While we are not waiting for the computer to
 // stop shaking try to make a decision about
 // the motion.
 if(!wait) {
   
   // There's always some shaking going on so we
   // need to check if the shaking was on purpose.
   if( vals[0] > KNOCK+X ) {
     screenLeft();
     wait = true;
   }

   if( vals[0] < -1*KNOCK+X ) {
     screenRight();
     wait = true;
   }

 }
 else {
   wait_cnt++;
 }


}

void screenRight() {
 try {
   robot.keyPress(KeyEvent.VK_META);   // hold meta
   robot.keyPress(KeyEvent.VK_RIGHT ); // then press arrow
   robot.keyRelease(KeyEvent.VK_META);
   robot.keyRelease(KeyEvent.VK_RIGHT);
 }
 catch (Exception e) {
   println("Exception your honor!");
 }
}

void screenLeft() {
 try {
   robot.keyPress(KeyEvent.VK_META);   // hold meta
   robot.keyPress(KeyEvent.VK_LEFT ); // then press arrow
   robot.keyRelease(KeyEvent.VK_META);
   robot.keyRelease(KeyEvent.VK_LEFT);
 }
 catch (Exception e) {
   println("Exception your honor!");
 }
}

void screenUp() {
 try {
   robot.keyPress(KeyEvent.VK_META);   // hold meta
   robot.keyPress(KeyEvent.VK_UP ); // then press arrow
   robot.keyRelease(KeyEvent.VK_META);
   robot.keyRelease(KeyEvent.VK_UP);
 }
 catch (Exception e) {
   println("Exception your honor!");
 }
}


void screenDown() {
 try {
   robot.keyPress(KeyEvent.VK_META);   // hold meta
   robot.keyPress(KeyEvent.VK_DOWN );  // then press arrow
   robot.keyRelease(KeyEvent.VK_META);
   robot.keyRelease(KeyEvent.VK_DOWN);
 }
 catch (Exception e) {
   println("Exception your honor!");
 }
}