c语言第一个小游戏：贪吃蛇小游戏06

实现贪吃蛇四方向的风骚走位

实现代码

#include <curses.h>

#include <stdlib.h>

struct snake{

        int hang;

        int lie;

        struct snake *next;

};

struct snake *head;

struct snake *tail;

int key;

int dir; //全局变量

#define UP     1  //这个是宏定义，主要就是让人更好理解 ，也为了后期的方向做了铺垫

#define DOWN  -1

#define LEFT   2

#define RIGHT -2

void initNcurse()

{

        initscr();

        keypad(stdscr,1);

        noecho();

}

int  hasSnakeNode(int i,int j)

{

        struct snake *p;

        p = head;

        while(p != NULL){

                if(p->hang==i && p->lie==j){

                        return 1;

                }

                p=p->next;

        }

        return 0;

}

void gamepic()

{

        int hang;

        int lie;

        move(0,0);

        for(hang=0;hang<20;hang++){

                if(hang == 0){

                        for(lie=0;lie<20;lie++){

                                printw("--");

                        }

                 printw("\n");

                }

                if(hang>=0 && hang<=19){

                        for(lie=0;lie<=20;lie++){

                                 if(lie==0||lie==20){

                                         printw("|");

                                 }else if(hasSnakeNode(hang,lie)){

                                        printw("[]");

                                 }

                                 else{

                                         printw("  ");

                                 }

                        }

                        printw("\n");

                }

                if(hang == 19){

                        for(lie=0;lie<20;lie++){

                                 printw("--");

                        }

                        printw("\n");

                }

          }

          printw("by shijintao\n");

          printw("key =%d\n",key);

   }

void addNode()

{

        struct snake *new;

        new =(struct snake *)malloc(sizeof(struct snake));

        new->next=NULL;

                switch(dir){

                case UP:

                        new->hang=tail->hang-1;

                        new->lie=tail->lie;

                        tail->next=new;

                        tail = new;

                        break;

                case DOWN:

                        new->hang=tail->hang+1;

                        new->lie=tail->lie;

                        tail->next=new;

                        tail = new;

                        break;

                case LEFT:

                        new->lie=tail->lie-1;

                        new->hang=tail->hang;

                        tail->next=new;

                        tail = new;

                        break;

                case RIGHT:

                        new->lie=tail->lie+1;

                        new->hang=tail->hang;

                        tail->next=new;

                        tail = new;

                        break;

                 }

}

当为dir为up的时候  hang变，lie不变

当为dir为down的时候  hang变，lie不变

当为dir为left的时候  lie变，hang不变

当为dir为right的时候  lie变，hang不变

void  initSnake()

{

        struct snake *p;

         dir = RIGHT; //这边我们设置了一个初始方向  dir是全局变量

        while(head != NULL){

             p=head;

             head=head->next;

             free(p);

        }

head = (struct snake *)malloc(sizeof(struct snake))；

        head->hang=2;

        head->lie=2;

        head->next=NULL;

        tail = head;

        addNode();

        addNode();

}

void deleteNode()

{

        struct snake *p;

        p = head;

        head = head->next;

        free(p);

}

void moveSnake()

{

        addNode();

        deleteNode();

        if(tail->hang==0||tail->hang==20||tail->lie==20||tail->lie==0){

                initSnake();

        }

}

void *  changeDir()

{

        while(1){

                key =getch();

                switch(key){   //这个key是全局变量  会通过changeDir函数改变

                        case KEY_DOWN:

                                dir = DOWN;  //这个DOWN是通过宏定义定义的

                                break;

                        case KEY_UP:

                                dir = UP;

                                break;

                        case KEY_RIGHT:

                                dir = RIGHT;

                                break;

                        case KEY_LEFT:

                                dir = LEFT;

                                break;

                }

        }

}

void * gamerefresh()

{

        while(1){

                moveSnake();

                gamepic();

                refresh();

                usleep(100000);

        }

}

int main()

{

                pthread_t th1;

                pthread_t th2;

                initNcurse();

                initSnake();

                gamepic();

                pthread_create(&th2,NULL,gamerefresh,NULL);

                pthread_create(&th1,NULL,changeDir,NULL);

                while(1);//死循环不能让主线程退出，这样就可以一直玩游戏了

                getch();

                endwin();

                return 0;

}

                                                                      

优化代码（方向相反不能直接走）

#include <curses.h>

#include <stdlib.h>

struct snake{

        int hang;

        int lie;

        struct snake *next;

};

struct snake *head;

struct snake *tail;

int key;

int dir;

#define UP     1

#define DOWN  -1

#define LEFT   2

#define RIGHT -2

void initNcurse()

{

        initscr();

        keypad(stdscr,1);

        noecho(); //这个就是ncurse的按键盘的时候会弹出来乱七八糟的符号，输入这个就可以去掉，不然地图很奇怪，很多乱七八糟的符号

}

int  hasSnakeNode(int i,int j)

{

        struct snake *p;

        p = head;

        while(p != NULL){

                if(p->hang==i && p->lie==j){

                        return 1;

                }

                p=p->next;

        }

        return 0;

}

void gamepic()

{

        int hang;

        int lie;

        move(0,0);

        for(hang=0;hang<20;hang++){

                if(hang == 0){

                        for(lie=0;lie<20;lie++){

                                printw("--");

                        }

                 printw("\n");

                }

                if(hang>=0 && hang<=19){

                        for(lie=0;lie<=20;lie++){

                                 if(lie==0||lie==20){

                                         printw("|");

                                 }else if(hasSnakeNode(hang,lie)){

                                        printw("[]");

                                 }

                                 else{

                                         printw("  ");

                                 }

                        }

                        printw("\n");

                }

                if(hang == 19){

                        for(lie=0;lie<20;lie++){

                                 printw("--");

                        }

                        printw("\n");

                }

          }

          printw("by shijintao\n");

          printw("key =%d\n",key);

   }

void addNode()

{

        struct snake *new;

        new =(struct snake *)malloc(sizeof(struct snake));

        new->next=NULL;

                switch(dir){

                case UP:

                        new->hang=tail->hang-1;

                        new->lie=tail->lie;

                        tail->next=new;

                        tail = new;

                        break;

                case DOWN:

                        new->hang=tail->hang+1;

                        new->lie=tail->lie;

                        tail->next=new;

                        tail = new;

                        break;

                case LEFT:

                        new->lie=tail->lie-1;

                        new->hang=tail->hang;

                        tail->next=new;

                        tail = new;

                        break;

                case RIGHT:

                        new->lie=tail->lie+1;

                        new->hang=tail->hang;

                        tail->next=new;

                        tail = new;

                        break;

                 }

}

void  initSnake()

{

        struct snake *p;

        while(head != NULL){

             p=head;

             head=head->next;

             free(p);

        }

head = (struct snake *)malloc(sizeof(struct snake));

        dir = RIGHT;

        head->hang=2;

        head->lie=2;

        head->next=NULL;

        tail = head;

        addNode();

        addNode();

}

void deleteNode()

{

        struct snake *p;

        p = head;

        head = head->next;

        free(p);

}

void moveSnake()

{

        addNode();

        deleteNode();

        if(tail->hang==0||tail->hang==20||tail->lie==20||tail->lie==0){

                initSnake();

        }

}

void turn(int direction)

{

        if(abs(dir) != abs(direction)){

                dir = direction;

        }

}

//这段代码就是更改贪吃蛇不能相反移动的核心了，利用abs绝对值的方法，这个direction是新的方向，这个dir是旧方向 ，在这边我们设置左右上下的值互为相反数，如果他们的绝对值相等的话，那我们就不把新方向替代旧方向，说白了我白说了，只要绝对值相等，那么就不会换方向，只要绝对值不相等，就换方向，这个值取决于你在宏定义里面的设置,就像下面的一样

//#define UP     1

//#define DOWN  -1

//#define LEFT   2

//#define RIGHT -2

void *  changeDir()

{

        while(1){

                key =getch();

                switch(key){

                        case KEY_DOWN:

                                turn(DOWN);

                                break;

                        case KEY_UP:

                                turn(UP);

                                break;

                        case KEY_RIGHT:

                                turn(RIGHT);

                                break;

                        case KEY_LEFT:

                                turn(LEFT);

                                break;

                }

        }

}

void * gamerefresh()

{

        while(1){

                moveSnake();

                gamepic();

                refresh();

                usleep(100000);

        }

}

int main()

{

                pthread_t th1;

                pthread_t th2;

                initNcurse();

                initSnake();

                gamepic();

                pthread_create(&th2,NULL,gamerefresh,NULL);

                pthread_create(&th1,NULL,changeDir,NULL);

                while(1);

                getch();

                endwin();

                return 0;

}