C++基于EasyX制作贪吃蛇游戏（四）第二版代码与程序
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上接C++基于EasyX制作贪吃蛇游戏（三）第二版文档 ，本文是代码的实现。
开发环境
工具：VS2017
依赖：EasyX Library for C++ (Ver:20200520(beta))
源代码
#include <graphics.h>
#include <conio.h>
#include <stdlib.h>
#include <time.h>
//蛇头方向预定义
#define UP 1 //↑
#define RIGHT 2 //→
#define DOWN 3 //↓
#define LEFT 4 //←
#define MAX_SPEED 5 //最大速度
#define MIN_SPEED 29 //最小速度
#define ORG_SPEED 18 //原始速度
/*-------------结构体定义---------------*/
typedef struct Node //蛇的节点
{
int x; //横左边
int y; //纵坐标
struct Node *next; //指向下一个节点的指针
struct Node *pre; //指向前一个节点的指针
} *LinkNode;
struct Snake //蛇的结构体
{
LinkNode head; //指向头节点的指针
LinkNode tail; //指向尾节点的指针
int direction; //蛇头方向
int num; //节点数目
};
struct Food //食物结构体
{
int x; //横坐标
int y; //纵坐标
bool exist; //是否存在，1表示存在
};
/*-------------全局变量---------------*/
int g_score = 0; //获得分数
int g_speed = ORG_SPEED; //控制速度，即延迟等待时间
Snake snake; //游戏中的蛇本体
Food food; //食物
/*-------------函数声明---------------*/
void init(); //初始化
void close(); //释放资源
void play(); //开始游戏
void initdata(); //游戏数据初始化
void drawgame(); //绘制界面
void gameplay(); //游戏流程控制
/*---游戏区相关函数---*/
void drawfood(Food food); //绘制食物
void drawsnake(Snake snake); //绘制蛇
void drawsnakenode(Node node); //绘制蛇的结点
void drawsnakehead(Node node); //画蛇的头部
void clearsnakenode(Node node); //清除蛇的结点
void snakebodymove(Snake &snake); //蛇身体结点向前复制
bool collidesnake(Snake snake); //碰撞自身检测
/*---数据展示区相关函数---*/
void cleardisplay(); //清除数据展示区内容
void drawscore(); //绘制分数
void drawnodes(); //绘制蛇长度
void drawspeed(); //绘制速度
/*---程序状态区相关函数---*/
void clearstate(); //清除程序状态区内容
void drawpause(); //输出暂停信息
void drawruntime(); //输出正在运行的信息
void drawover(); //输出游戏结束信息
void drawoverchoose(); //绘制游戏结束后的选项
/*-------------程序入口---------------*/
int main()
{
init();
play();
close();
return 0;
}
/*-------------函数实现---------------*/
//初始化
void init()
{
initgraph(640, 480); //初始化窗口
}
//游戏
void play()
{
initdata();
drawgame();
gameplay();
}
//释放资源
void close()
{
_getch();
closegraph();
}
//初始化数据
void initdata()
{
//蛇与食物初始化
//食物初始坐标为(310,230)
food.x = 310;
food.y = 230;
food.exist = true;
//蛇初始长度为3，蛇头坐标为(210,230)
//如果蛇的头节点和尾节点有信息
if (snake.head != NULL && snake.tail != NULL)
{
LinkNode linknode = snake.head;
while (linknode != snake.tail)
{
linknode = linknode->next;
free(linknode->pre);
}
free(snake.tail);
snake.head = NULL;
snake.tail = NULL;
}
//在堆上开辟空间，防止此函数的生命周期结束后结点全部被释放掉
LinkNode nodes2 = (LinkNode)malloc(sizeof(Node));
nodes2->x = 170;
nodes2->y = 230;
nodes2->next = nullptr;
LinkNode nodes1 = (LinkNode)malloc(sizeof(Node));
nodes1->x = 190;
nodes1->y = 230;
nodes1->next = nodes2;
LinkNode nodes0 = (LinkNode)malloc(sizeof(Node));
nodes0->x = 210;
nodes0->y = 230;
nodes0->next = nodes1;
nodes2->pre = nodes1;
nodes1->pre = nodes0;
nodes0->pre = nullptr;
snake.head = nodes0;
snake.tail = nodes2;
snake.direction = RIGHT;
snake.num = 3;
//初始分数
g_score = (snake.num - 3) * 10;
//初始化速度
g_speed = ORG_SPEED;
}
//绘制界面
void drawgame()
{
//清空屏幕
setbkcolor(0);//设置背景色黑色
cleardevice();
//画宽度为2的棕色实线，分割游戏区
setlinecolor(BROWN);
setlinestyle(PS_SOLID, 2);
line(482, 0, 482, 480);
/*--------------绘制功能介绍区----------*/
settextstyle(16, 0, L"宋体");
settextcolor(0XFFFFFF);
outtextxy(530,20,L"玩法介绍");
settextstyle(14, 0, L"宋体");
outtextxy(490, 50, L"↑ ← ↓ → 控制方向");
outtextxy(490, 70, L"w a s d 控制方向");
outtextxy(490, 90, L"速度等级1-25，默认12");
outtextxy(500, 110, L"c键加速，x键减速");
outtextxy(500, 130, L"z键恢复原始速度");
outtextxy(500, 150, L"空格键暂停/继续");
outtextxy(500, 170, L"Esc键直接关闭程序");
setlinecolor(BROWN);
setlinestyle(PS_SOLID, 2);
line(482, 190, 640, 190);
/*--------------绘制数据展示区----------*/
settextstyle(16, 0, L"宋体");
settextcolor(0XFFFFFF);
outtextxy(530, 200, L"数据展示");
//绘制分数
drawscore();
//绘制蛇身长度
drawnodes();
//绘制速度
drawspeed();
setlinecolor(BROWN);
setlinestyle(PS_SOLID, 2);
line(482, 300, 640, 300);
/*--------------绘制程序状态区----------*/
settextstyle(16, 0, L"宋体");
settextcolor(0XFFFFFF);
outtextxy(530, 310, L"游戏状态");
//绘制程序正在运行中
drawruntime();
settextstyle(14, 0, L"宋体");
settextcolor(0XFFFFFF);
outtextxy(530, 450, L"By Colourso");//作者信息
outtextxy(510, 465, L"www.colourso.top");
/*--------------游戏区----------*/
//绘制食物
drawfood(food);
//绘制蛇
drawsnake(snake);
}
//开始游戏
void gameplay()
{
Node ends; //末尾结点
bool speedchange = false;
BeginBatchDraw();
while (true)
{
ends.x = snake.tail->x;
ends.y = snake.tail->y;
if (!food.exist)
{
int x;
int y;
while (1)
{
srand(time(0));
x = (rand() % 24) * 20 + 10;
y = (rand() % 24) * 20 + 10;
//食物位置检测算法
LinkNode linknode = snake.head;
bool cont = true;
while (linknode != snake.tail->next)
{
if (linknode->x == x && linknode->y == y)
{
cont = false;
break;
}
linknode = linknode->next;
}
if (cont)
{
break;
}
}
food.x = x;
food.y = y;
food.exist = true;
drawfood(food);
}
//按键检测
if (_kbhit())
{
char key = _getch();
switch (key)
{
case 72: //↑
case 119: //w
if (snake.direction != UP && snake.direction != DOWN)
snake.direction = UP;
break;
case 80: //↓
case 115: //s
if (snake.direction != UP && snake.direction != DOWN)
snake.direction = DOWN;
break;
case 75: //←
case 97: //a
if (snake.direction != LEFT && snake.direction != RIGHT)
snake.direction = LEFT;
break;
case 77: //→
case 100: //d
if (snake.direction != LEFT && snake.direction != RIGHT)
snake.direction = RIGHT;
break;
case 99: //c 加速
if (g_speed > MAX_SPEED)
{
g_speed -= 1;
speedchange = true;
}
break;
case 120://x 减速
if (g_speed < MIN_SPEED)
{
g_speed += 1;
speedchange = true;
}
break;
case 122://z 回归原速
g_speed = ORG_SPEED;
speedchange = true;
break;
case 32: //空格暂停
drawpause(); //状态区显示
while (true)
{
if(_kbhit())
{
char key = _getch();
if (key == 32) //按空格继续
{
clearstate();
drawruntime(); //绘制程序正在运行中
break;
}
}
}
break;
case 27://Esc直接退出
exit(0);
break;
}
}
//速度变化的话绘制数据展示区内容
if (speedchange)
{
speedchange = false;
cleardisplay();
drawscore();
drawnodes();
drawspeed();
}
//消除走过的尾端结点
clearsnakenode(ends);
//前进，绘制头部走过的节点
switch (snake.direction)
{
case UP:
{
//头部y-20,x不变
snakebodymove(snake);
snake.head->y -= 20;
drawsnakehead(*(snake.head));
drawsnakenode(*(snake.head->next));//将原来的头部变成身体的颜色
break;
}
case RIGHT:
{
//头部x+20,y不变
snakebodymove(snake);
snake.head->x += 20;
drawsnakehead(*(snake.head));
drawsnakenode(*(snake.head->next));
break;
}
case DOWN:
{
//头部y+20,x不变
snakebodymove(snake);
snake.head->y += 20;
drawsnakehead(*(snake.head));
drawsnakenode(*(snake.head->next));
break;
}
case LEFT:
{
//头部x-20,y不变
snakebodymove(snake);
snake.head->x -= 20;
drawsnakehead(*(snake.head));
drawsnakenode(*(snake.head->next));
break;
}
}
//蛇吃食物
if (snake.head->x == food.x && snake.head->y == food.y && food.exist)
{
food.exist = false;
//分数变化
g_score += 10;
//在末尾增加新的结点，维护双向链表的关系
LinkNode nodes = (LinkNode)malloc(sizeof(Node));
nodes->x = ends.x;
nodes->y = ends.y;
nodes->next = snake.tail->next;
nodes->pre = snake.tail;
snake.tail->next = nodes;
snake.tail = nodes;
++snake.num;
drawsnakenode(ends);
cleardisplay();
drawscore();
drawnodes();
drawspeed();
}
FlushBatchDraw();
//碰撞判断
bool collidewall = snake.head->x < 10 || snake.head->x > 470 || snake.head->y < 10 || snake.head->y > 470;
if (collidewall || collidesnake(snake))
{
drawover();
drawoverchoose();
while (true)
{
if (_kbhit())
{
char key = _getch();
if (key == 114) //按r重新开始
{
Sleep(1000); //延迟1秒
play();
}
else if (key == 113)//按q退出
{
cleardevice();
TCHAR s[] = _T("Game Over");
settextstyle(48, 0, _T("黑体"));
outtextxy(230, 210, s);
settextstyle(24, 0, _T("宋体"));
outtextxy(250, 260, L"获得分数：");
settextcolor(0xFF5555);//亮蓝
TCHAR t[5];
_stprintf_s(t, _T("%d"), g_score); // 高版本 VC 推荐使用 _stprintf_s 函数
outtextxy(380, 260, t);
settextcolor(0xFFFFFF);//白
Sleep(1500);
exit(0);
}
}
}
break;
}
Sleep(g_speed*10);
EndBatchDraw();
}
}
//绘制食物
void drawfood(Food food)
{
//红色，全填充，无边框的圆
setfillcolor(RED);
setfillstyle(BS_SOLID);
solidcircle(food.x, food.y, 8);
}
//绘制蛇的结点
void drawsnakenode(Node node)
{
//绿色，全填充，无边框的正方形
setfillcolor(GREEN);
setfillstyle(BS_SOLID);
solidrectangle(node.x - 9, node.y + 9, node.x + 9, node.y - 9);
}
//画蛇的头部
void drawsnakehead(Node node)
{
//紫色，全填充，无边框的正方形
setfillcolor(0xAA00AA);
setfillstyle(BS_SOLID);
solidrectangle(node.x - 9, node.y + 9, node.x + 9, node.y - 9);
}
//清除蛇的结点
void clearsnakenode(Node node)
{
//黑色，全填充，无边框的正方形
setfillcolor(BLACK);
setfillstyle(BS_SOLID);
solidrectangle(node.x - 9, node.y + 9, node.x + 9, node.y - 9);
}
//绘制蛇
void drawsnake(Snake snake)
{
LinkNode linknode = snake.head;
drawsnakehead(*linknode);//画头部
linknode = linknode->next;
while (linknode != snake.tail->next)
{
drawsnakenode(*linknode);
linknode = linknode->next;
}
}
//蛇身体结点向前复制
void snakebodymove(Snake &snake)
{
LinkNode linknode = snake.tail;
while (linknode != snake.head)
{
linknode->x = linknode->pre->x;
linknode->y = linknode->pre->y;
linknode = linknode->pre;
}
}
//碰撞自身检测
bool collidesnake(Snake snake)
{
if (snake.num <= 3)
return false;
LinkNode node = snake.head->next;
while (node != snake.tail->next)
{
if (node->x == snake.head->x && node->y == snake.head->y)
return true;
node = node->next;
}
return false;
}
//清除功能展示区
void cleardisplay()
{
//黑色，全填充，无边框的正方形
setfillcolor(BLACK);
setfillstyle(BS_SOLID);
solidrectangle(485, 220, 640, 290);
}
//绘制分数
void drawscore()
{
TCHAR s[] = _T("获得分数：");
settextstyle(16, 0, _T("宋体"));
outtextxy(500, 230, s);
settextcolor(0xFF5555);//亮蓝
TCHAR t[5];
_stprintf_s(t, _T("%d"), g_score); // 高版本 VC 推荐使用 _stprintf_s 函数
outtextxy(580, 230, t);
settextcolor(0xFFFFFF);//白
}
//绘制蛇长度
void drawnodes()
{
settextstyle(16, 0, L"宋体");
outtextxy(500, 250, L"蛇身长度：");
settextcolor(0xFF55FF);//亮紫
TCHAR t[5];
_stprintf_s(t, _T("%d"), snake.num); // 高版本 VC 推荐使用 _stprintf_s 函数
outtextxy(580, 250, t);
settextcolor(0xFFFFFF);//白
}
//绘制速度
void drawspeed()
{
TCHAR s[] = _T("当前速度：");
settextstyle(16, 0, _T("宋体"));
outtextxy(500, 270, s);
int speed = 30 - g_speed;//速度等级显示为1 - 25
if (speed <= 9)
{
settextcolor(0x0000AA);//红-
}
else if (speed >= 18)
{
settextcolor(0x00AA00);//绿
}
else
{
settextcolor(0x55FFFF);//黄
}
TCHAR t[5];
_stprintf_s(t, _T("%d"), speed); // 高版本 VC 推荐使用 _stprintf_s 函数
outtextxy(580, 270, t);
settextcolor(0xFFFFFF);//白
}
//清除程序状态区内容
void clearstate()
{
//黑色，全填充，无边框的正方形
setfillcolor(BLACK);
setfillstyle(BS_SOLID);
solidrectangle(485, 330, 640, 450);
}
//绘制程序暂停状态
void drawpause()
{
settextcolor(0xFF55FF);//亮紫
settextstyle(16, 0, L"宋体");
outtextxy(530, 340, L"游戏暂停");
outtextxy(500, 360, L"按空格键继续");
settextcolor(0xFFFFFF);//白
}
//绘制程序正在运行中
void drawruntime()
{
settextcolor(0x55FF55);//亮绿
settextstyle(16, 0, L"宋体");
outtextxy(530, 340, L"畅玩ing");
settextcolor(0xFFFFFF);//白
}
void drawover()
{
settextcolor(0x5555FF);//亮红
settextstyle(16, 0, L"宋体");
outtextxy(530, 340, L"GameOver");
settextcolor(0xFFFFFF);//白
}
void drawoverchoose()
{
setlinecolor(0xFFFFFF);
rectangle(530,370,600,400);
settextcolor(0x55FF55);//亮绿
settextstyle(16, 0, L"宋体");
outtextxy(540, 377, L"重来(r)");
settextcolor(0xFFFFFF);//白
setlinecolor(0xFFFFFF);
rectangle(530, 420, 600, 450);
settextcolor(0x5555FF);//亮绿
settextstyle(16, 0, L"宋体");
outtextxy(540, 427, L"退出(q)");
settextcolor(0xFFFFFF);//白
}
程序展示
以下是B站视频
上面视频不能播放请移步：https://www.bilibili.com/video/BV1mK4y1e7Uo/
因为图片大小限制就不展示更多功能了，自行体会吧。
如果图片无法加载可以在博客园查看效果：
资源下载
链接：https://pan.baidu.com/s/1aR_p9Ji1lkj-nUoN2-o28Q
提取码：16eu
Github地址：https://github.com/Colourso/Simple-CPP-project-by-Colourso/
