C++实现简单贪吃蛇游戏

蛇移动的算法是，头先动，如果判断可以走，则把头原来的位置push_front到body的头部，然后用pop_back把body的尾部抹去
（读者不熟悉list容器的操作的话可以先去了解一下，很容易的：））

4、游戏运行主文件(game.cpp)

#include "map.hpp"
#include "global.hpp"
#include <iostream>
#include <list>
#include <algorithm>

using std::cin;
using std::cout;
using std::cerr;
using std::endl;

class InvalidInputException {
 public:
 InvalidInputException() { cerr << "Invalid input!" << endl; }
};
class DuplicateInputException : public InvalidInputException {
 public:
 DuplicateInputException() { cerr << "Duplicate input!" << endl; }
};

class GameUI {
 private:
 map* world;
 point initial_size;
 point initial_head;
 std::list<point> initial_foods;

 public:
 GameUI() {
  cout << "please input two positive integers indicates the map size!"
     << endl;
  cin >> initial_size.x >> initial_size.y;
  if (initial_size.x <= 5 || initial_size.y <= 5 || initial_size.x > 15 ||
    initial_size.y > 15) {
   cout << "invalid input" << endl;
   throw InvalidInputException();
  }
  cout << "please input two positive integers(range(0, size_x-1), "
      "range(0,size_y-1)) the initialize snake head position!"
     << endl;
  cin >> initial_head.x >> initial_head.y;
  if (initial_head.x >= initial_size.x || initial_head.x < 0 ||
    initial_head.y >= initial_size.y || initial_head.y < 0) {
   cout << "invalid input" << endl;
   throw InvalidInputException();
  }
  int food_num;
  cout << "please input how many food you will put and then input food "
      "position which is different form each other"
     << endl;
  cin >> food_num;

  if (food_num <= 0) {
   throw InvalidInputException();
  }

  while (food_num > 0) {
   food_num--;
   point temp;
   cin >> temp.x >> temp.y;
   if (temp.x >= 0 && temp.x < initial_size.x && temp.y >= 0 &&
     temp.y < initial_size.y &&
     std::find(initial_foods.begin(), initial_foods.end(), temp) ==
       initial_foods.end() &&
     !(temp.x == initial_head.x && temp.y == initial_head.y)) {
    initial_foods.push_back(temp);
   } else {
    throw DuplicateInputException();
   }
  }

  world = new map(initial_size, initial_head, initial_foods);
 }

 ~GameUI() { delete world; }

 void GameLoop() {
  world->print();
  bool exit = false;
  while (true) {
   char operation = getInput();
   switch (operation) {
    case 'w':
    case 'W':
     this->world->move(up);
     break;
    case 's':
    case 'S':
     this->world->move(down);
     break;
    case 'a':
    case 'A':
     this->world->move(left);
     break;
    case 'd':
    case 'D':
     this->world->move(right);
     break;
    case 'q':
    case 'Q':
     exit = true;
     break;
    default:
     this->world->move(freeze);
   }
   world->print();
   if (world->isGameOver()) {
    cout << "Game Over!" << endl;
    break;
   }
   if (exit) {
    cout << "Bye!" << endl;
    break;
   }
  }
 }

 char getInput() {
  char temp;
  cin >> temp;
  return temp;
 }
};

int main() { // 看，main函数只有这么短！！！！
 GameUI greedySnake;
 greedySnake.GameLoop();
 return 0;
}

								 
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