function intersect(C, R, A, B) {
    var marge = 0.1
    var dist = function  (X, Y) {
        return Math.sqrt(Math.pow(X.x - Y.x, 2) + Math.pow(X.y - Y.y, 2))
    }

    var dichotomie = function (I, O) {
        if (dist(I, C) - D < marge) { return I }
        else if (dist(O, C) - D < marge) { return O }
        else {
            var M = {"x": (I.x + (O.x - I.x) / 2), "y": (I.y + (O.y - I.y) / 2)}
            if (dist(M, C) < D) { return dichotomie(M, O) }
            else { return dichotomie(I, M) }
        }
    }

    var A_Inside = dist(A, C) < R;
    var B_Inside = dist(B, C) < R;
    if (A_Inside && B_Inside) {
        return [undefined, undefined];
    }
    else if (A_Inside) {
        return [A, dichotomie(A, B)];
    }
    else if (B_Inside) {
        return [B, dichotomie(B, A)];
    }
    else {
        // TODO : both outside
    }
}