scrawlr/differences.js at master · sjaturner/scrawlr · GitHub

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phantom.injectJs('angles.js');
phantom.injectJs('utils.js');
function differences_stroke(a,b){
   var ret=[];
   var len_a=a.sec.length;
   var len_b=b.sec.length;
   var most;
   var len_most;
   var most_total_len;
   var least;
   var len_least;
   var least_total_len;
   var offset;
   var log_hi;
   var log_lo;
   var acc_most_len;
   var acc_least_len;
   var scan;
   var score;

   var most_len;
   var least_len;

   var lograt;

   if(len_a>len_b){
      most=a;
      len_most=len_a;

      least=b;
      len_least=len_b;
   }
   else{
      most=b;
      len_most=len_b;

      least=a;
      len_least=len_a;
   }

   most_total_len=most.len;
   least_total_len=least.len;


   for(offset=0;offset<len_most-len_least+1;++offset){
      log_hi=Number.MIN_VALUE;
      log_lo=Number.MAX_VALUE;
      acc_most_len=0;
      acc_least_len=0;
      acc_score=0;

      for(scan=0;scan<len_least;++scan){
         score=correlate(most.sec[offset+scan].resampled,least.sec[offset].resampled,poldiff);
         acc_score+=score;

         most_len=most.sec[offset+scan].len;
         acc_most_len+=most_len;

         least_len=least.sec[scan].len;
         acc_least_len+=least_len;

         lograt=Math.log(most_len/least_len);

         if(lograt>log_hi){
            log_hi=lograt;
         }

         if(lograt<log_lo){
            log_lo=lograt;
         }
      }

      logscale=log_hi-log_lo;
      leastrat=acc_least_len/(1+least_total_len);
      mostrat=acc_most_len/(1+most_total_len);

      if(leastrat==0 || mostrat==0){
         final_score=Number.MAX_VALUE; /* wtf, this cannot happen */
      }
      else{
         final_score=(1+logscale)*acc_score/Math.pow(leastrat*mostrat,3);
      }

      ret.push(final_score);
   }

   return ret;
}

// http://stackoverflow.com/questions/9960908/permutations-in-javascript
// http://jsfiddle.net/MgmMg/6/

/*
 *   Permutate the elements in the specified array by swapping them
 *   in-place and calling the specified callback function on the array
 *   for each permutation.
 *
 *   Return the number of permutations.
 *
 *   If array is undefined, null or empty, return 0.
 *
 *   NOTE: when permutation succeeds, the array should be in the original state
 *   on exit!
 */
function permutate(array, callback) {
    // Do the actual permuation work on array[], starting at index
    function p(array, index, callback) {
        // Swap elements i1 and i2 in array a[]
        function swap(a, i1, i2) {
            var t = a[i1];
            a[i1] = a[i2];
            a[i2] = t;
        }

        // Are we at the last element of the array?
        if (index == array.length - 1) {
            // Nothing more to do - call the callback
            callback(array);
            // We have found a single permutation
            return 1;
        } else {
            // Still work to do.
            // Count the number of permutations to our right
            var count = p(array, index + 1, callback);
            // Swap the element at position index with
            // each element to its right, permutate again,
            // and swap back
            for (var i = index + 1; i < array.length; i++) {
                swap(array, i, index);
                count += p(array, index + 1, callback);
                swap(array, i, index);
            }
            return count;
        }
    }

    // No data? Then no permutations!
    if (!array || array.length == 0) {
        return 0;
    }

    // Start the permutation
    return p(array, 0, callback);
}

function differences_multipart(a,b){
   var ret=[];
   var perms=[];
   var pi;
   var score;
   var bi;
   var res;

   permutate(a,function(p){
      perms.push(p.slice(0));
   });

   for(pi=0;pi<perms.length;++pi){
      score=0;
      for(bi=0;bi<b.length;++bi){
         score+=differences_stroke(perms[pi][bi],b[bi]).sort(intcmp)[0];
      }
      ret.push(score);
   }

   return ret;
}

a={"sec":[{"len":155,"resampled":[0,0,0,0,0,0,-0.03,-0.05,-0.05,-0.05,-0.05,-0.05,-0.06,-0.03,0,0]},{"len":183,"resampled":[2.83,2.88,2.84,2.81,2.79,2.79,2.8,2.76,2.72,2.78,2.82,2.82,2.8,2.79,2.74,2.77]},{"len":256,"resampled":[-0.14,-0.13,-0.12,-0.11,-0.1,-0.11,-0.12,-0.12,-0.11,-0.09,-0.09,-0.1,-0.09,-0.08,-0.10500000000000001,0]}],"len":607}
b={"sec":[{"len":155,"resampled":[0,0,0,0,0,0,-0.03,-0.05,-0.05,-0.05,-0.05,-0.05,-0.06,-0.03,0,0]},{"len":183,"resampled":[2.83,2.88,2.84,2.81,2.79,2.79,2.8,2.76,2.72,2.78,2.82,2.82,2.8,2.79,2.74,2.77]},{"len":256,"resampled":[-0.14,-0.13,-0.12,-0.11,-0.1,-0.11,-0.12,-0.12,-0.11,-0.09,-0.09,-0.1,-0.09,-0.08,-0.10500000000000001,0]}],"len":607}
c={"sec":[{"len":155,"resampled":[0,0,0,0,0,0,-0.03,-0.05,-0.05,-0.05,-0.05,-0.05,-0.06,-0.03,0,0]},{"len":256,"resampled":[-0.14,-0.13,-0.12,-0.11,-0.1,-0.11,-0.12,-0.12,-0.11,-0.09,-0.09,-0.1,-0.09,-0.08,-0.10500000000000001,0]}],"len":607}

// console.log(differences_stroke(a,c));

// console.log(differences_multipart([1,2,3],[7,8,9]));

a=[{'len': 127, 'stroke': [[531, 187], [532, 187], [535, 187], [542, 187], [559, 187], [574, 187], [586, 186], [597, 185], [607, 184], [615, 184], [622, 183], [629, 183], [635, 183], [640, 183], [645, 183], [649, 183], [653, 183], [656, 183], [657, 183], [658, 183], [658, 183]], 'sec': [{'resampled': [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -0.050000000000000003, -0.080000000000000002, -0.089999999999999997, -0.089999999999999997, -0.02, -0.095000000000000001, 0.0, 0.0, 0.0, 0.0], 'len': 127}], 'bbox': [[531, 183], [658, 187]], 'letter': {}, 'time': 1350153597.2683401}, {'len': 64, 'stroke': [[587, 181], [588, 181], [588, 183], [588, 185], [588, 187], [588, 189], [588, 190], [588, 192], [588, 194], [588, 196], [588, 197], [587, 200], [587, 203], [587, 206], [588, 210], [589, 213], [589, 216], [589, 220], [589, 223], [589, 226], [589, 229], [589, 232], [589, 236], [589, 239], [589, 241], [589, 242], [589, 243], [590, 243], [590, 243]], 'sec': [{'resampled': [1.3847499999999999, 1.5700000000000001, 1.5700000000000001, 1.5700000000000001, 1.7850000000000001, 1.6799999999999999, 1.5625, 1.3283333333333334, 1.4600000000000002, 1.5700000000000001, 1.5700000000000001, 1.5700000000000001, 1.5700000000000001, 1.5700000000000001, 1.5700000000000001, 1.5700000000000001], 'len': 64}], 'bbox': [[587, 181], [590, 243]], 'letter': {}, 'time': 1350153599.4100969}]
b=[{'len': 166, 'stroke': [[197, 116], [199, 116], [203, 117], [209, 122], [216, 129], [222, 138], [232, 148], [242, 158], [254, 169], [267, 180], [276, 188], [283, 194], [290, 201], [298, 208], [306, 214], [312, 219], [317, 223], [320, 225], [320, 226], [319, 226], [319, 226]], 'sec': [{'resampled': [0.30500000000000005, 0.72999999999999998, 0.85499999999999998, 0.93999999999999995, 0.79500000000000004, 0.78000000000000003, 0.77000000000000002, 0.73999999999999999, 0.71999999999999997, 0.70999999999999996, 0.70999999999999996, 0.72999999999999998, 0.76000000000000001, 0.68999999999999995, 0.67000000000000004, 0.68000000000000005], 'len': 166}], 'bbox': [[197, 116], [320, 226]], 'letter': {}, 'time': 1350153594.0370569}, {'len': 146, 'stroke': [[319, 131], [318, 131], [317, 131], [314, 134], [308, 139], [299, 145], [291, 152], [282, 160], [273, 169], [264, 181], [256, 193], [249, 203], [242, 210], [238, 215], [236, 218], [235, 220], [234, 220], [234, 221], [233, 222], [230, 224], [225, 228], [221, 231], [219, 233], [218, 233], [218, 233]], 'sec': [{'resampled': [2.5499999999999998, 2.4399999999999999, 2.5299999999999998, 2.46, 2.4199999999999999, 2.3999999999999999, 2.3599999999999999, 2.2799999999999998, 2.2000000000000002, 2.1600000000000001, 2.1699999999999999, 2.25, 2.3049999999999997, 2.1742857142857139, 2.5, 2.48], 'len': 146}], 'bbox': [[218, 131], [319, 233]], 'letter': {}, 'time': 1350153595.265907}]

console.log(differences_multipart(a,b));
phantom.exit();