public bool isOverlap(Polygon poly)
{
for (int i = 0; i < points.Length; i++) {
if (poly.isOverlap(points[i])) {
return true;
}
}
for (int i = 0; i < poly.points.Length; i++) {
if (isOverlap(poly.points[i])) {
return true;
}
}
return false;
}