```/*
*
*  This file is the solution to an exercise problem posed during
*  one of the UW CSE 333 lectures (333exercises).
*
*  333exercises is free software: you can redistribute it and/or modify
*  the Free Software Foundation, either version 3 of the License, or
*  (at your option) any later version.
*
*  333exercises is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with 333exercises.  If not, see <http://www.gnu.org/licenses/>.
*/

// Lecture 15 exercise 1

#include <sstream>
#include <math.h>

#include "./Square.h"

// Return the centroid of the shape.
std::pair<double, double> Square::Centroid() const {
std::pair<double, double> r3(
(v1_.first + v2_.first + v3_.first + v4_.first) / 4,
(v1_.second + v2_.second + v3_.second + v4_.second) / 4);
return r3;
}

// Return the area of the shape.
double Square::Area() const {
Triangle t1_(v1_, v2_, v3_);
Triangle t2_(v2_, v3_, v4_);
return t1_.Area() + t2_.Area();
}

// Move the shape by adding "delta" to the shape.
void Square::Move(const std::pair<double, double> &delta) {
v1_.first = v1_.first + delta.first;
v2_.first = v2_.first + delta.first;
v3_.first = v3_.first + delta.first;
v4_.first = v4_.first + delta.first;
v1_.second = v1_.second + delta.second;
v2_.second = v2_.second + delta.second;
v3_.second = v3_.second + delta.second;
v4_.second = v4_.second + delta.second;
}

// Return a string with some pretty-printed shape details.
std::string Square::Print() const {
std::stringstream retS;
retS << "[Square] v1=(" << v1_.first << "," << v1_.second << "), ";
retS << "v2=(" << v2_.first << "," << v2_.second << "), ";
retS << "v3=(" << v3_.first << "," << v3_.second << "), ";
retS << "v4=(" << v4_.first << "," << v4_.second << ")";
return retS.str();
}
```