用c++和SFML实现简易的界面版贪吃蛇

运行截图

等待开始界面

运行过程

失败界面截图

SFML配置

csdn上面已经有很多SFML配置的blog，随便就能搜到。正常配置好SFML后，还需要将字体ttf文件放在源代码同一目录和exe同一目录中，不然无法显示字符

代码部分

下面贴上各个部分的代码

头文件和全局常量

#include 
  
    #include 
   
     #include 
    
      #include 
     
       const int BodyMaxLong = 2000; //最长蛇身 const int SnakeInitLongth = 10; //初始蛇身 const sf::Vector2f SnakeInitPos = {200,200}; //蛇头初始位置 const int BodyRadius = 5; //蛇身半径 const sf::Vector2i WindowSize = { 500,500 }; const int FoodRadius = 2; const int FoodNum = 30; #define SnakeColor sf::Color::Green #define FoodColor sf::Color::Red 
      
     
    
  

sfml中已经定义了颜色可以直接用，还有图形类和二维向量类（int型vector2i，float型vector2f）,都在名称空间sf中。

蛇

既然是贪吃蛇游戏，那么一定有蛇啦。

class Snake { //蛇 private: int longth; //蛇身长度 sf::Vector2f dir; //蛇当前行进方向 sf::CircleShape body[BodyMaxLong]; //用圆形类来建造蛇身 public: Snake() { longth = SnakeInitLongth; dir = { 5 , 0 }; //初始方向 for (int i = 0;i < 5;i++) { //初始化位置和蛇身每个圆形之间的间距 sf::Vector2f pos = { SnakeInitPos.x - i * 5, SnakeInitPos.y }; body[i].setPosition(pos); } for (int i = 0;i < BodyMaxLong;i++) { //初始化蛇身半径和颜色 body[i].setRadius(BodyRadius); body[i].setFillColor(SnakeColor); } } void SnakeMove() { //整体移动蛇身函数,用一个循环依次移动每一个蛇身 for (int i = longth - 1;i > 0;i--) { body[i].setPosition(body[i - 1].getPosition().x,body[i - 1].getPosition().y); } body[0].move(dir); } void SnakeHolding(sf::Event &event) { //控制蛇行进方向 switch (event.key.code) { case sf::Keyboard::Up: case sf::Keyboard::W:if (dir.x != 0 && dir.y != 5) { dir = { 0,-5 }; }break; case sf::Keyboard::Left: case sf::Keyboard::A:if (dir.x != 5 && dir.y != 0) { dir = { -5,0 }; }break; case sf::Keyboard::Right: case sf::Keyboard::D:if (dir.x != -5 && dir.y != 0) { dir = { 5,0 }; }break; case sf::Keyboard::Down: case sf::Keyboard::S:if (dir.x != 0 && dir.y != -5) { dir = { 0 , 5 }; }break; default: break; } } sf::CircleShape PreDrawSnake(int i) { //在主函数绘制蛇时需要返回每个圆形对象 return this->body[i]; } int GetSnakeLongth() { return this->longth; } void UpLevel() { this->longth++; } //吃到食物升级，长度自增 sf::Vector2f GetDir() { return dir; } };

食物

typedef struct { //一个包含下x,y两个整型的结构体，用于表示坐标，本来可以用vector2i的，发现下面老是报错就尝试自己写个结构体，发现可以运行就这么运行了 int x; int y; }PosData; class Food { //食物类 private: PosData pos; sf::CircleShape Body; public: Food() { pos = { rand() % 500,rand() % 500 }; //初始化随机食物位置 Body.setFillColor(FoodColor); //初始化食物颜色 Body.setPosition({(float)pos.x,(float)pos.y}); //将位置设置进图形对象中 Body.setRadius(FoodRadius); //初始化食物的图形半径 } sf::Vector2f GetFoodPos() { //返回食物位置的函数 return { (float)this->pos.x+FoodRadius,(float)this->pos.y+FoodRadius }; } void SetFoodPos() { //一旦被吃掉，重新随机获得一个位置 pos = { rand() % WindowSize.x, rand() % WindowSize.y }; Body.setPosition({(float)pos.x,(float)pos.y}); } sf::CircleShape PreDraFood() { return this->Body; } //返回图形对象，以便绘制和其他功能 };

判断函数

检查有没有吃到食物用的函数

void GetFoodCheck(Snake& snake, Food& food) { sf::Vector2f snakepos = { snake.PreDrawSnake(0).getPosition().x+BodyRadius,snake.PreDrawSnake(0).getPosition().y+BodyRadius}; sf::Vector2f foodpos = food.GetFoodPos(); if (foodpos.x >= snakepos.x - BodyRadius && foodpos.x <= snakepos.x + BodyRadius && foodpos.y>=snakepos.y - BodyRadius && foodpos.y<=snakepos.y + BodyRadius) { snake.UpLevel(); food.SetFoodPos(); } }

检查有没有撞墙或者咬到尾巴的函数，都没有则返回1，有其一则返回0

bool CollideCheck(Snake& snake) { sf::CircleShape head = snake.PreDrawSnake(0); if (head.getPosition().x >= WindowSize.x || head.getPosition().x <= 0 || head.getPosition().y >= WindowSize.y || head.getPosition().y <= 0) { return 0; } int longth = snake.GetSnakeLongth(); for (int i = 1;i < longth;i++) { if (snake.GetDir().x == 0) { if (snake.PreDrawSnake(0).getPosition().x + BodyRadius >= snake.PreDrawSnake(i).getPosition().x && snake.PreDrawSnake(0).getPosition().x + BodyRadius <= snake.PreDrawSnake(i).getPosition().x + BodyRadius * 2) { if (snake.GetDir().y > 0) { if (snake.PreDrawSnake(0).getPosition().y + BodyRadius * 2 >= snake.PreDrawSnake(i).getPosition().y && snake.PreDrawSnake(0).getPosition().y + BodyRadius * 2 <= snake.PreDrawSnake(i).getPosition().y + BodyRadius * 2) { return 0; } } else { if (snake.PreDrawSnake(0).getPosition().y >= snake.PreDrawSnake(i).getPosition().y && snake.PreDrawSnake(0).getPosition().y <= snake.PreDrawSnake(i).getPosition().y + BodyRadius * 2) { return 0; } } } } if (snake.GetDir().y == 0) { if (snake.PreDrawSnake(0).getPosition().y + BodyRadius >= snake.PreDrawSnake(i).getPosition().y && snake.PreDrawSnake(0).getPosition().y + BodyRadius <= snake.PreDrawSnake(i).getPosition().y + BodyRadius * 2) { if (snake.GetDir().x > 0) { if (snake.PreDrawSnake(0).getPosition().x + BodyRadius * 2 >= snake.PreDrawSnake(i).getPosition().x && snake.PreDrawSnake(0).getPosition().x + BodyRadius * 2 <= snake.PreDrawSnake(i).getPosition().x + BodyRadius * 2) { return 0; } } else { if (snake.PreDrawSnake(0).getPosition().x >= snake.PreDrawSnake(i).getPosition().x && snake.PreDrawSnake(0).getPosition().x <= snake.PreDrawSnake(i).getPosition().x + BodyRadius * 2) { return 0; } } } } } return 1; }

main函数

int main() { sf::Text text,score,pretext; sf::Font font,cnfont; font.loadFromFile("arial.ttf"); //加载字体文件 cnfont.loadFromFile("hpsimplifiedhans-light.ttf"); text.setPosition(1, 1); //设置字体的位置 score.setPosition(100, 1); pretext.setPosition(20,150); pretext.setString("Welcome to shushuSnake Game\npress space button\n start the game"); //设置字符内容 pretext.setFont(font); pretext.setFillColor(sf::Color::Blue); text.setString("Score:"); text.setFont(font);score.setFont(font); text.setFillColor(sf::Color::Black);score.setFillColor(sf::Color::Black); std::string str; srand((int)time(0)); sf::RenderWindow window(sf::VideoMode(WindowSize.x,WindowSize.y),"shushuSnake"); Snake snake; //创建蛇 Food food[FoodNum]; //创建食物 sf::Clock clock; // double timer = 0, delay = 0.05; // bool prep = 0; //若prep = 0 等待玩家按空格开始游戏，开始游戏后prep = 1 int longth; while (window.isOpen()) { if (!prep) { sf::Event event; while (window.pollEvent(event)) { if (event.type == sf::Event::Closed) { window.close(); } if (event.type == sf::Event::KeyPressed) { if (event.key.code == sf::Keyboard::Space) { prep = 1; } } } window.clear(sf::Color::White); window.draw(text); score.setString("0"); window.draw(score); window.draw(pretext); window.display(); } if (prep) { float time = clock.getElapsedTime().asSeconds(); // clock.restart(); // timer += time; sf::Event event; while (window.pollEvent(event)) { if (event.type == sf::Event::Closed) { window.close(); } if (event.type == sf::Event::KeyPressed) { snake.SnakeHolding(event); } } longth = snake.GetSnakeLongth(); window.clear(sf::Color::White); for (int i = 0;i < FoodNum; i++) //食物绘制 { window.draw(food[i].PreDraFood()); } if (timer > delay) { timer = 0;snake.SnakeMove(); for (int i = 0; i < FoodNum;i++) { GetFoodCheck(snake, food[i]); } if (CollideCheck(snake) == 0) //咬到尾巴或者撞到墙失败了 { sf::Text endtext; endtext.setString("Game Over!!"); endtext.setPosition(100, 150); endtext.setFont(font); endtext.setCharacterSize(50); endtext.setFillColor(sf::Color::Red); window.clear(sf::Color::White); window.draw(text); window.draw(score); window.draw(endtext); longth = snake.GetSnakeLongth(); for (int i = 0; i < longth;i++) //蛇身绘制 window.draw(snake.PreDrawSnake(i)); window.display(); if (_getch())return 0; } str = std::to_string(snake.GetSnakeLongth() - SnakeInitLongth); score.setString(str); } for (int i = 0; i < longth;i++) //蛇身绘制 window.draw(snake.PreDrawSnake(i)); window.draw(text); window.draw(score); window.display(); } } return 0; }

欢迎大家一起讨论！