protractor

by migerh

JavaScript

// Code from $N Multistroke recognizer

function OptimalCosineDistance(v1, v2) {
    var a = 0.0,
        b = 0.0,
        i, angle;
    
    for (i = 0; i < v1.length; i += 2) {
        a += v1[i] * v2[i] + v1[i + 1] * v2[i + 1];
        b += v1[i] * v2[i + 1] - v1[i + 1] * v2[i];
    }
    
    angle = Math.atan(b / a);
    alert(angle);
    return Math.acos(a * Math.cos(angle) + b * Math.sin(angle));
}

alert(OptimalCosineDistance([0, 1], [1, 0]));