原文：https://www.bbsmax.com/A/kvJ3qEVpdg/
#include<graphics.h> //包含easyx图形库文件
#include<time.h> //C语言时间头文件
#include<mmsystem.h>//win32多媒体设备接口文件
#pragma comment(lib,"winmm.lib")//win32多媒体设备接口库
#define WIN_WIDTH 1024 //屏幕的宽
#define WIN_HEIGHT 640//576 //屏幕高
#define MAP_WIDTH (WIN_WIDTH*3) //地图宽度
#define MAP_HEIGHT (WIN_HEIGHT*3)//地图高度
#define FOOD_NUM 500 //食物数量
#define AI_NUM 200 //ai数量
IMAGE map(MAP_WIDTH, MAP_HEIGHT);
POINT g_CameraPos; // 摄像机(屏幕左上角)在地图上的位置
struct Ball
{
bool flag; // 是否被吃 活 1,死 0
COLORREF color; // 颜色
float r; //
float x; // 坐标
float y;
int type; //食物独有属性，决定是什么类型的食物（圆？矩形？多边形？）
};
struct Ball mover; //玩家
struct Ball food[FOOD_NUM]; //食物数组
struct Ball ai[AI_NUM]; //AI数量
void ChaseAlgorithom(Ball *chase, Ball *run);
float DisTance(Ball b1, Ball b2);
void Gameinit()
{
//设置随机数种子
srand((unsigned)time(NULL));
//播放背景音乐
mciSendString("open BallGame.mp3 alias bk", , , );
mciSendString("play bk repeat", , , );
//初始化食物
for (int i = ; i < FOOD_NUM; i++)
{
food[i].x = (float)(rand() % MAP_WIDTH);
food[i].y = (float)(rand() % MAP_HEIGHT);
food[i].r = (float)(rand() % + );
food[i].color = RGB(rand() % , rand() % , rand() % ); // 随机颜色
food[i].flag = ;
food[i].type = rand() % ;
}
//初始化AI
for (int i = ; i < AI_NUM; i++)
{
ai[i].color = RGB(rand() % , rand() % , rand() % ); //rand()%256 随机取值 0-255
ai[i].flag = ;
ai[i].x = rand() % (MAP_WIDTH - int(ai[i].r + 0.5)) + int(ai[i].r + 0.5); //AI产生的位置不会出现一个越界
ai[i].y = rand() % (MAP_HEIGHT - int(ai[i].r + 0.5)) + int(ai[i].r + 0.5);
ai[i].r = float(rand() % + );
}
{//初始化玩家数据
mover.color = BLUE;
mover.r = ;
//玩家在窗口的位置
mover.x = rand() % WIN_WIDTH;
mover.y = rand() % WIN_HEIGHT;
mover.flag = ;
}
}
//游戏地图开始绘制位置判断
void computeCameraPos()
{
// 以人物位置为中心计算摄像机的理论位置
g_CameraPos.x = mover.x - WIN_WIDTH / ;
g_CameraPos.y = mover.y - WIN_HEIGHT / ;
// 防止摄像机越界
if (g_CameraPos.x < ) g_CameraPos.x = ;
if (g_CameraPos.y < ) g_CameraPos.y = ;
if (g_CameraPos.x > MAP_WIDTH - WIN_WIDTH) g_CameraPos.x = MAP_WIDTH - WIN_WIDTH;
if (g_CameraPos.y > MAP_HEIGHT - WIN_HEIGHT) g_CameraPos.y = MAP_HEIGHT - WIN_HEIGHT;
}
//游戏绘制
void Gamedraw()
{
SetWorkingImage(&map);
setbkcolor(WHITE); // 白色背景
cleardevice();
//画食物
for (int i = ; i < FOOD_NUM; i++)
{
if (food[i].flag == )
{
setfillcolor(food[i].color);
if (food[i].type == )
{
solidellipse((int)food[i].x, (int)food[i].y, (int)(food[i].x + food[i].r), (int)(food[i].y + food[i].r));
}
else if (food[i].type == )
{
solidpie((int)food[i].x, (int)food[i].y, (int)(food[i].x + food[i].r), (int)(food[i].y + food[i].r), 0.0, 1.5);
}
else
{
solidcircle(int(food[i].x), int(food[i].y), int(food[i].r));
}
}
else
{
food[i].x = (float)(rand() % MAP_WIDTH);
food[i].y = (float)(rand() % MAP_HEIGHT);
food[i].r = (float)(rand() % + );
food[i].color = RGB(rand() % , rand() % , rand() % ); // 随机颜色
food[i].flag = ;
food[i].type = rand() % ;
}
}
//画AI
for (int i = ; i < AI_NUM; i++)
{
if (ai[i].flag == )
{
setfillcolor(ai[i].color);
solidcircle(ai[i].x, ai[i].y, ai[i].r);
}
else
{
ai[i].color = RGB(rand() % , rand() % , rand() % ); //rand()%256 随机取值 0-255
ai[i].flag = ;
ai[i].x = rand() % (MAP_WIDTH - int(ai[i].r + 0.5)) + int(ai[i].r + 0.5); //AI产生的位置不会出现一个越界
ai[i].y = rand() % (MAP_HEIGHT - int(ai[i].r + 0.5)) + int(ai[i].r + 0.5);
ai[i].r = float(rand() % + );
}
}
//绘制玩家
setfillcolor(RED);
fillcircle(mover.x, mover.y, mover.r);
//绘制玩家名称
settextcolor(BLACK);
setbkmode(TRANSPARENT);
settextstyle(, , "楷体");
char pname[] = "微信公众号：C语言编程学习基地";
int twidth = textwidth(pname) / ;//计算文字宽度为了居中显示在玩家中央
outtextxy(mover.x - twidth, mover.y, pname);
//恢复默认工作区，即窗口
SetWorkingImage();
//更新摄像机位置
computeCameraPos();
//把地图显示到窗口上
putimage(, , WIN_WIDTH, WIN_HEIGHT, &map, g_CameraPos.x, g_CameraPos.y);
}
//玩家移动，参数为玩家移动的速度（单位像素）
void Gamemove(int speed)
{
//获取键盘按键
if (GetAsyncKeyState(VK_UP) & 0x8000)
{
if (mover.y - mover.r > )
{
mover.y -= speed;
}
}
if (GetAsyncKeyState(VK_DOWN) & 0x8000)
{
if (mover.y + mover.r < MAP_HEIGHT)
{
mover.y += speed;
}
}
if (GetAsyncKeyState(VK_LEFT) & 0x8000)
{
if (mover.x - mover.r > )
{
mover.x -= speed;
}
}
if (GetAsyncKeyState(VK_RIGHT) & 0x8000)
{
if (mover.x + mover.r < MAP_WIDTH)
{
mover.x += speed;
}
}
//作弊测试，按空格不断增大,A缩小
if (GetAsyncKeyState(VK_SPACE) & 0x8000)
{
mover.r += ;
}
if (GetAsyncKeyState('A') & 0x8000)
{
if (mover.r > )
mover.r -= ;
}
}
//玩家吃食物
void EatFood()
{
for (int i = ; i < FOOD_NUM; i++)
{
if (food[i].flag == && DisTance(food[i], mover) < mover.r)
{
food[i].flag = ;
mover.r += food[i].r / ;
}
}
}
//玩家吃Ai，Ai吃玩家
void EatAi()
{
for (int i = ; i < AI_NUM; i++)
{
if (ai[i].flag == )
continue;
//玩家吃Ai
if (DisTance(ai[i], mover) < mover.r - ai[i].r / )
{
ai[i].flag = ;
mover.r += ai[i].r / ;
break;//吃到一个就退出
}
//ai吃玩家
else if (DisTance(ai[i], mover) < ai[i].r - mover.r / )
{
mover.x = rand() % MAP_WIDTH;
mover.y = rand() % MAP_HEIGHT;
ai[i].r += mover.r / ;
mover.r = ;
break;
}
}
}
//AI吃食物,AI吃Ai
void AiEatFood()
{
for (int i = ; i < AI_NUM; i++)
{
if (ai[i].flag == )
continue;
//ai吃食物
for (int j = ; j < FOOD_NUM; j++)
{
if (food[j].flag == && DisTance(ai[i], food[j]) < ai[i].r)
{
food[j].flag = ;
ai[i].r += food[i].r / ;
}
}
//Ai吃Ai
for (int k = i + ; k < AI_NUM; k++)
{
if (ai[k].flag == )
{
if (DisTance(ai[i], ai[k]) < ai[k].r - ai[i].r / )
{
ai[i].flag = ;
ai[k].r += ai[i].r / ;
}
else if (DisTance(ai[i], ai[k]) < ai[i].r - ai[k].r / )
{
ai[k].flag = ;
ai[i].r += ai[k].r / ;
}
}
}
}
}
//Ai移动算法，追逐比自己半径小的球
void AiMove()
{
for (int i = ; i < AI_NUM; i++)
{
double min_DISTANCE = MAP_WIDTH;//最大搜索距离
int min = -;//用来保存找到目标小球的下标
if (ai[i].flag == )
{
//AI靠近AI
for (int k = i + ; k < AI_NUM; k++)
{
if (ai[i].r > ai[k].r&&ai[k].flag == )
{//如果能吃，且距离达到要求则更新距离，并保存下标
if (DisTance(ai[i], ai[k]) < min_DISTANCE)
{
min_DISTANCE = DisTance(ai[i], ai[k]);
min = k;
}
}
}
}
//如果找到目标，则去追逐
if ((min != -))
{
ChaseAlgorithom(&ai[i], &ai[min]);
}
}
}
void JudeEat()
{
EatFood();
EatAi();
AiEatFood();
AiMove();
}
int main()
{
initgraph(WIN_WIDTH, WIN_HEIGHT, );
Gameinit();
DWORD t1, t2;
t1 = t2 = GetTickCount();
while ()
{
Gamedraw();
Gamemove();
if (t2 - t1 > )
{
JudeEat();
t1 = t2;
}
t2 = GetTickCount();
}
getchar();
closegraph();
return ;
}
//追逐算法
void ChaseAlgorithom(Ball *chase, Ball *run)
{
if (rand() % == )
{
if (chase->x < run->x)
{
chase->x += ;
}
else
{
chase->x -= ;
}
}
else
{
if (chase->y < run->y)
{
chase->y += ;
}
else
{
chase->y -= ;
}
}
}
//求两点之间的距离
float DisTance(Ball b1, Ball b2)
{
return sqrt((b1.x - b2.x)*(b1.x - b2.x) + (b1.y - b2.y)*(b1.y - b2.y));
}