/*
 * Copyright 2011 Steven Gribble
 *
 *  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
 *  it under the terms of the GNU General Public License as published by
 *  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"

using std::pair;
using std::string;
using std::stringstream;

// Return the centroid of the shape.
pair<double, double> Square::Centroid() const {
  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 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.
string Square::Print() const {
  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();
}