这位朋友，你见过自动进食的贪吃蛇吗！想不想用C语言自己写一个...

- 日理万妓 2023-03-14 10:47 2阅读 0赞

## 效果图 ##

![静态效果图][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4OTAyODQ0_size_16_color_FFFFFF_t_70]  
![动态效果图][20200517162615580.gif]

## 说明 ##

*  由于本人水平有限，算法并不完美，所以每次的运行结果都不尽相同，得分有高有低
 *  本程序中使用ege图形库，所以如果你之前没有安装，需要先安装一下这个库。这个库相对于其它的图形库来说是比较简单的，很容易上手的。本程序只是使用了其中几个基础的绘图函数
 *  ege图形库的[官网链接][Link 1]

## 源代码 ##

#include <stdio.h>
    // 这个就是 ege图形库的头文件
    #include <graphics.h>
    #include <time.h>
    #include <conio.h>
    #include <stdlib.h>
    
    // 定义坐标
    typedef struct { 
    	int x;
    	int y;
    }Pos;
    
    // 定义蛇
    struct Snake{ 
    	// 用数组来保存蛇身的每一块的坐标,最长100节
    	Pos xy[100];
    	int len;	// 保存蛇身的长度
    	char dir;	// 定义蛇的前进方向
    }snake;
    
    enum dir{ up,down,left,right};
    
    // 定义食物
    struct Food{ 
    	Pos fdxy;	// 食物的位置
    	int flag;	// 蛇是否吃到了食物
    	int grade;	// 定义食物的分数
    }food;
    
    // 定义一些全局变量
    // 停顿时间，越小越快
    int speed=300;
    // 方块的大小
    int size=10;
    // 窗口的宽高
    int width = 400;
    int height = 300;
    
    void initSnake() { 
    	// 创建前三节
    	snake.xy[2].x = 0;
    	snake.xy[2].y = 0;
    	snake.xy[1].x = size;
    	snake.xy[1].y = 0;
    	snake.xy[0].x = 2*size;
    	snake.xy[0].y = 0;
    
    	snake.len = 3;
    	snake.dir = right;
    }
    
    void drawSnake() { 
    	// 把蛇身绘制出来 
    	setfillcolor(YELLOW);
    	bar(snake.xy[0].x, snake.xy[0].y, snake.xy[0].x + size, snake.xy[0].y + size);
    	bar(snake.xy[1].x, snake.xy[1].y, snake.xy[1].x + size, snake.xy[1].y + size);
    	for (int i = 2; i < snake.len; i++) { 
    		//setcolor(BLACK);
    		setfillcolor(BLUE);
    		bar(snake.xy[i].x, snake.xy[i].y, snake.xy[i].x + size, snake.xy[i].y + size);
    	}
    }
    
    void moveSnake() { 
    	// 除蛇头外的蛇身都向前移动
    	for (int i = snake.len - 1; i > 0; i--) { 
    		snake.xy[i].x = snake.xy[i-1].x;
    		snake.xy[i].y = snake.xy[i-1].y;
    	}
    	// 根据前进方向决定蛇头的位置
    	switch (snake.dir) { 
    		case up:
    			snake.xy[0].y -= size;
    			break;
    		case down:
    			snake.xy[0].y += size;
    			break;
    		case left:
    			snake.xy[0].x -= size;
    			break;
    		case right:
    			snake.xy[0].x += size;
    			break;
    		default:
    			break;
    	}
    }
    // 检测蛇是否撞到自己或墙
    // 1：会撞到 0：撞不到
    int check(Pos nextPos) { 
    	int i;
    	for (i = 1; i < snake.len; i++) { 
    		if (nextPos.x == snake.xy[i].x && nextPos.y == snake.xy[i].y) { 
    			return 1;
    		}
    	}
    	if (nextPos.x<0 || nextPos.x>=width || nextPos.y<0 || nextPos.y>=height) { 
    		return 1;
    	}
    	return 0;
    }
    
    // 
    void switchDir() { 
    	Pos nextPos;
    
    	switch (snake.dir)
    	{ 
    		case up:
    			nextPos.x = snake.xy[0].x;
    			nextPos.y = snake.xy[0].y - size;
    			// 如果前面走不通或者食物出现在身后
    			if (check(nextPos) || food.fdxy.y > snake.xy[0].y) { 
    				nextPos.x = snake.xy[0].x - size;
    				nextPos.y = snake.xy[0].y;
    				if (!check(nextPos)) { 
    					snake.dir = left;
    				}
    				else { 
    					snake.dir = right;
    				}
    			}
    			break;
    		case down:
    			nextPos.x = snake.xy[0].x;
    			nextPos.y = snake.xy[0].y + size;
    			if (check(nextPos) || food.fdxy.y < snake.xy[0].y) { 
    				nextPos.x = snake.xy[0].x - size;
    				nextPos.y = snake.xy[0].y;
    				if (!check(nextPos)) { 
    					snake.dir = left;
    				}
    				else { 
    					snake.dir = right;
    				}
    			}
    			break;
    		case left:
    			nextPos.x = snake.xy[0].x - size;
    			nextPos.y = snake.xy[0].y;
    			if (check(nextPos) || food.fdxy.x > snake.xy[0].x) { 
    				nextPos.x = snake.xy[0].x;
    				nextPos.y = snake.xy[0].y - size;
    				if (!check(nextPos)) { 
    					snake.dir = up;
    				}
    				else { 
    					snake.dir = down;
    				}
    			}
    			break;
    		case right:
    			nextPos.x = snake.xy[0].x + size;
    			nextPos.y = snake.xy[0].y;
    			if (check(nextPos) || food.fdxy.x < snake.xy[0].x) { 
    				nextPos.x = snake.xy[0].x;
    				nextPos.y = snake.xy[0].y - size;
    				if (!check(nextPos)) { 
    					snake.dir = up;
    				}
    				else { 
    					snake.dir = down;
    				}
    			}
    			break;
    	}
    }
    
    // 根据食物的位置改变前进方向
    void keyDown() { 
    	// 获取按键
    	Pos nextPos;
    	if (snake.dir == left || snake.dir == right) { 
    		if (food.fdxy.y < snake.xy[0].y) { 
    			nextPos.x = snake.xy[0].x;
    			nextPos.y = snake.xy[0].y-size;
    			if (!check(nextPos)) { 
    				snake.dir = up;
    			}
    			else { 
    				snake.dir = down;
    			}
    		}
    		else if(food.fdxy.y > snake.xy[0].y){ 
    			nextPos.x = snake.xy[0].x;
    			nextPos.y = snake.xy[0].y+size;
    			if (!check(nextPos)) { 
    				snake.dir = down;
    			}
    			else { 
    				snake.dir = up;
    			}
    		}
    		else { 
    			if (snake.xy[0].y <= 0) { 
    				snake.dir = down;
    			}
    			if (snake.xy[0].y >= height-size) { 
    				snake.dir = up;
    			}
    			switchDir();
    		}
    	}
    	else { 
    		if (food.fdxy.x < snake.xy[0].x) { 
    			nextPos.x = snake.xy[0].x - size;
    			nextPos.y = snake.xy[0].y;
    			if (!check(nextPos)) { 
    				snake.dir = left;
    			}
    			else { 
    				snake.dir = right;
    			}
    		}
    		else if(food.fdxy.x > snake.xy[0].x){ 
    			nextPos.x = snake.xy[0].x + size;
    			nextPos.y = snake.xy[0].y;
    			if (!check(nextPos)) { 
    				snake.dir = right;
    			}
    			else { 
    				snake.dir = left;
    			}
    		}
    		else { 
    			if (snake.xy[0].x <= 0) { 
    				snake.dir = right;
    			}
    			if (snake.xy[0].x >= width-size) { 
    				snake.dir = left;
    			}
    			switchDir();
    		}
    	}
    
    	switchDir();
    }
    
    void initFood() { 
    	// 随机数播种
    	srand(time(NULL));
    	// 生成随机坐标
    	food.fdxy.x = rand() % (width/size) * size;
    	food.fdxy.y = rand() % (height/size) * size;
    
    	// 判断食物是否与蛇身重合
    	for (int i = 0; i < snake.len; i++) { 
    		if (snake.xy[i].x == food.fdxy.x && snake.xy[i].y == food.fdxy.y) { 
    			// 重新生成坐标
    			food.fdxy.x = rand() % (width/size) * size;
    			food.fdxy.y = rand() % (height/size) * size;			
    		}
    	}
    	// 蛇还没吃到食物
    	food.flag = 1;
    }
    
    void drawFood() { 
    	setfillcolor(RED);
    	bar(food.fdxy.x, food.fdxy.y, food.fdxy.x+size, food.fdxy.y+size);
    }
    
    void eatFood() { 
    	// 如果蛇头与食物重合，我们就认为蛇吃到了食物
    	if (snake.xy[0].x == food.fdxy.x && snake.xy[0].y == food.fdxy.y) { 
    		// 蛇吃到了食物
    		food.flag = 0;
    		// 蛇身变长
    		snake.len++;
    		// 加分
    		food.grade += 10;
    	}
    }
    
    void showScore() { 
    	LOGFONTA f;
    	getfont(&f);                          // 获取当前字体设置
    	f.lfHeight = 16;    
    	setfont(&f);
    
    	char str[100] = "";
    	sprintf(str, "分数：%d", food.grade);
    	// 分数越高，速度越快，但不能小于50
    	if (speed > 50) { 
    		speed -= 50 * (food.grade / 50);
    	}
    	setbkmode(TRANSPARENT);
    	setcolor(LIGHTGREEN);
    	outtextxy(300, 20, str);
    }
    
    // 判断蛇是否死亡，1代表死亡，0代表活着
    int snakeDie() { 
    
    	LOGFONTA f;
    	getfont(&f);                          // 获取当前字体设置
    	f.lfHeight = 48;                      // 设置字体高度为 48（包含行距）
    	f.lfWidth = 0;
    	strcpy(f.lfFaceName, "黑体");         // 设置字体为“黑体”
    	f.lfQuality = ANTIALIASED_QUALITY;    // 设置输出效果为抗锯齿 
    	setfont(&f);                          // 设置字体样式
    
    	if (check(snake.xy[0])) { 
    		outtextxy(width/2-120,height/2-24,"Game Over!!!");
    		return 1;
    	}
    	
    	return 0;
    }
    
    int main() { 
    
    	// 创建窗口
    	initgraph(width, height);  
    	setcaption("欢迎来到贪吃蛇世界！！！");
    	// 设置背景颜色 
    	setbkcolor(WHITE);
    	// 使用背景颜色清屏
    	cleardevice();
    
    	initSnake();
    	initFood();
    	while (1) { 
    		drawSnake();
    		drawFood();
    		eatFood();
    		showScore();
    		if (snakeDie()) { 
    			// 如果蛇死亡就结束循环
    			break;
    		}
    		// 如果蛇吃到了食物，重新生成食物
    		if (food.flag == 0) { 
    			initFood();
    		}
    		keyDown();
    		moveSnake();
    		Sleep(speed);
    		// 刷新屏幕
    		cleardevice();
    	}
    	
    	// conio.h 和 ege.h 中都定义了此函数，需要指明是那个文件中的
    	ege::getch();          // 按任意键继续
    	closegraph();          // 关闭绘图窗口
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4OTAyODQ0_size_16_color_FFFFFF_t_70]: /images/20230312/51aa617fbce14ecfbbee376c29f20ee7.png
[20200517162615580.gif]: /images/20230312/d298135907054aca8b7833e03d73f3d6.png
[Link 1]: https://xege.org/