How to access to a Vector<Point(x,y)> vec() elements?

Assuming x and y are accessible as members of your Point type,

for (Vector<point>::iterator i = vec.begin(); i != vec.end(); ++i) // srsly, what's with the post-incr in ALL code??
{
    int x = i->x; // or whatever type it is
    // do stuff
}
</point>

If your compiler supports the C++11 range-based for, this could become

for (Point const &p: vec) // or non-const, or by value, whatever
{
    // do stuff with p.x and p.y
}

Or using <algorithm> and C++11 lambda's:

std::for_each(vec.begin(), vec.end(), [&]
(Point const &p) 
{
    // do stuff with p.x and p.y
});