_relative_x[index[(k+1)%nb]] - _relative_x[index[m]],
_relative_y[index[(k+1)%nb]] - _relative_y[index[m]]);
- if(a1 * a2 > 0 && best_split < 0 || (abs(a1 - a2) < best_split)) {
+ if((a1 * a2 > 0 && best_split < 0) || (abs(a1 - a2) < best_split)) {
best_n = n; best_m = m;
best_split = abs(a1 - a2);
}