贪吃蛇进度（1）
现在实现了计时器机制和事件机制。下一步是怎么去实现贪吃蛇的走动。
现在分为两个文件：snake.h和snake.c
如下：snake.h
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | #define NEWEVENT (EventLink)malloc(sizeof(event)) #define MAXSNAKELEN 30 /* Max length of the snake */ #define DEFAULTSNAKECOLOR WHITE /* The default snake color */ #define DEFAULTSPEED 100000 /* The start speed of the snake */ #define DEFAULTSTARTX 100 /* The start x of the snake */ #define DEFAULTSTARTY 100 /* The start y of the snake */ #define MAXEVENT 1 /* The startup event number */ /* Keyboard definition */ #define ENTER 13 /* The prototype of bool type */ typedef enum { true, false } bool; /* The prototype of directions */ typedef enum { up, right, down, left } direction; /* The prototype of a point of the snake */ typedef struct { int posx; int posy; direction dir; /* The current direction of this point */ } point; /* The prototype of the snake */ typedef struct { point dots[MAXSNAKELEN]; } snake; #ifndef __SNAKE /* prevent multiple includes */ #define __SNAKE /* The prototype of the event */ typedef struct { long interval; /* The interval of the event occurs */ long timer; void (*invoke)(); /* The function pointer to the invoke action */ } event; /* The prototype of the eventlist */ struct eventlist { event *eventnow; struct eventlist *next; }; typedef struct eventlist Node; typedef Node *Link; typedef event *EventLink; int screenx = 0; int screeny = 0; void Init(snake *s); void EventHandler(Link); void EventInsert(Link, EventLink); Link EventCreater(Link); void EventFree(Link); /* Registry Events */ void Controler(); /* The main keyboard controler */ void DrawPoint(); void DrawLine(); void DrawSnake(snake *s); void EventInsert(Link eventhead, EventLink newevent) { Link pointer; Link newlist; pointer = eventhead; while (1) { if (pointer->next == NULL) { newlist = (Link) malloc(sizeof (Node)); newlist->eventnow = newevent; newlist->next = NULL; pointer->next = newlist; break; } pointer = pointer->next; } } Link EventCreater(Link eventhead) { Link newevent; EventLink tempevent; int i; eventhead = (Link) malloc(sizeof (Node)); /* Create event list */ if (eventhead == NULL) { printf("Memory allocate Failure!!\n"); } else { tempevent = (EventLink) malloc(sizeof (event)); tempevent->interval = 1; tempevent->timer = 0; tempevent->invoke = Controler; eventhead->eventnow = tempevent; eventhead->next = NULL; } return eventhead; } void EventFree(Link eventhead) { Link pointer; EventLink tempevent; while (eventhead != NULL) { pointer = eventhead; eventhead = eventhead->next; tempevent = eventhead->eventnow; free(pointer); free(tempevent); } } #endif |
Snake.c
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | #include <stdio.h> #include <stdlib.h> #include <time.h> #include <conio.h> #include <graphics.h> #include <dos.h> #include <snake.h> /* To return the head pointer of the eventlist */ int main(void) { snake me; Link head; int gdriver = DETECT, gmode; EventLink tempevent; /* Init graphic mode */ initgraph(&gdriver, &gmode, ""); Init(&me); head = EventCreater(head); tempevent = NEWEVENT; tempevent->interval = 10000; tempevent->timer = 0; tempevent->invoke = DrawPoint; EventInsert(head, tempevent); EventHandler(head); EventFree(head); closegraph(); clrscr(); return 0; } void DrawLine() { int x; int y; x = random(500); y = random(500); circle(x, y, 20); } void DrawPoint() { int x1, x2; int y1, y2; x1 = random(200); x2 = random(100); y1 = random(200); y2 = random(100); line(x1, y1, x2, y2); } void Controler() { } void Init(snake *s) { int i, j; int sx = DEFAULTSTARTX, sy = DEFAULTSTARTY; randomize(); for (i = 0; i < MAXSNAKELEN; i++) { s->dots[i].posx = sx; s->dots[i].posy = sy; s->dots[i].dir = up; sy++; } screenx = getmaxx(); screeny = getmaxy(); } /* Draw snake */ void DrawSnake(snake *s) { int i; for (i = 0; i < MAXSNAKELEN; i++) { putpixel(s->dots[i].posx, s->dots[i].posy, DEFAULTSNAKECOLOR); } } void EventHandler(Link eventhead) { int i; Link pointer; while (1) { delay(1); pointer = eventhead; while (pointer != NULL) { pointer->eventnow->timer++; if ((pointer->eventnow->timer) >= (pointer->eventnow->interval)) { /* Invoke current event */ pointer->eventnow->invoke(); pointer->eventnow->timer = 0; } pointer = pointer->next; } if (kbhit()) { if (getch() == ENTER) break; } } } |