游戏编程笔记起步（三）贪吃蛇游戏实现

游戏编程笔记-起步

3.贪吃蛇游戏实现

代码下载&＃xff1a;http://download.csdn.net/detail/you_lan_hai/3738025

核心代码实现如下&＃xff0c;算法描述见 “起步&＃xff08;一&＃xff09;”&＃xff1a;

#include "app.h"
#include
#include int g_map[100][100];//2维地图int g_nWidth &＃61; 610; //窗口宽度
int g_nHeight &＃61; 514;//窗口高度int g_rows &＃61; 0; //地图行数
int g_cols &＃61; 0; //地图列数
int g_nSize &＃61; 30; //地图方格尺寸struct Point//二维点
{int r;//行int c;//列
};Point g_snake[1000]; //蛇
int g_nLength &＃61; 0; //蛇的长度
int g_nSpeed;
bool g_bLive &＃61; true; //是否存活
int g_nSnakeDir &＃61; 0; //蛇的当前移动方向。0-左&＃xff0c;1-右&＃xff0c;2-上&＃xff0c;3-下const Point g_direction[4] &＃61; {{0,-1},{0,1},{-1,0},{1,0}};//四个方向运动增量。Point g_prizePos; //奖子坐标bool g_bPause &＃61; true; //是否暂停HBRUSH g_brushs[4]; //背景画刷void setSnakeDir(int dir)//设置蛇的运动方向。
{if ((dir&＃61;&＃61;0 && g_nSnakeDir&＃61;&＃61;1)|| (dir&＃61;&＃61;1 && g_nSnakeDir&＃61;&＃61;0)|| (dir&＃61;&＃61;2 && g_nSnakeDir&＃61;&＃61;3)|| (dir&＃61;&＃61;3 && g_nSnakeDir&＃61;&＃61;2))//反方向移动则令他暂停{g_bPause &＃61; true;return;//直接返回&＃xff0c;什么也不做。}else{g_bPause &＃61; false;g_nSnakeDir &＃61; dir;}
}void resetLevel()//重置关卡
{/*初始化地图。将四边初始为障碍&＃xff0c;即不可通过。* 0-可通过&＃xff0c;1-障碍&＃xff0c;2-奖子&＃xff0c;3-蛇*/memset(g_map,0,sizeof(g_map));for (int r&＃61;0; r}void init()//游戏初始化
{g_brushs[0] &＃61; CreateSolidBrush(RGB(255,255,255));//白色画刷g_brushs[1] &＃61; CreateSolidBrush(RGB(0,0,255));//绘制障碍画刷g_brushs[2] &＃61; CreateSolidBrush(RGB(255,0,0));//绘制奖子画刷g_brushs[3] &＃61; CreateSolidBrush(RGB(0,255,0));//绘制蛇画刷srand(GetTickCount());//矫正窗口高度、宽度数据RECT rc;GetClientRect(getHWnd(),&rc);g_nWidth &＃61; rc.right - rc.left;g_nHeight &＃61; rc.bottom - rc.top;//计算行列值g_rows &＃61; g_nHeight / g_nSize;g_cols &＃61; g_nWidth / g_nSize;resetLevel();
}void update()//逻辑更新
{//时钟控制static int oldTime &＃61; 0;int curTime &＃61; GetTickCount();if (curTime - oldTime 10000)//每隔10s更新一次位置。{//lastOcurTime不为-1表示&＃xff0c;没有被吃掉&＃xff0c;则将原来位置的奖子从地图擦掉。if (lastOcurTime !&＃61; -1){g_map[g_prizePos.r][g_prizePos.c] &＃61; 0;}lastOcurTime &＃61; curTime;//随机产生奖子位置。bool flag &＃61; true;while(flag){g_prizePos.r &＃61; rand()%(g_rows-2)&＃43;1;g_prizePos.c &＃61; rand()%(g_cols-2)&＃43;1;if (g_map[g_prizePos.r][g_prizePos.c] &＃61;&＃61; 0)//符合条件{flag &＃61; false;g_map[g_prizePos.r][g_prizePos.c] &＃61; 2;}}}if (!g_bLive || g_bPause)//死亡或暂停{return ;}//先判断是否可走&＃xff0c;即是否撞死。Point newHead;newHead.r &＃61; g_snake[0].r &＃43; g_direction[g_nSnakeDir].r;newHead.c &＃61; g_snake[0].c &＃43; g_direction[g_nSnakeDir].c;if (g_map[newHead.r][newHead.c]&＃61;&＃61;1 || g_map[newHead.r][newHead.c]&＃61;&＃61;3){g_bLive &＃61; false;if(IDYES &＃61;&＃61; MessageBox(getHWnd(),L"你撞死啦&＃xff01;是否重新来过&＃xff1f;",L"撞死提示",MB_YESNO)){resetLevel();}else{PostQuitMessage(0);}return ;}else if (g_map[newHead.r][newHead.c] &＃61;&＃61; 2)//遇到奖子{&＃43;&＃43;g_nLength ;lastOcurTime &＃61; -1;g_nSpeed -&＃61; 10;}else{//撤销尾部在地图上遗留数据g_map[g_snake[g_nLength-1].r][g_snake[g_nLength-1].c] &＃61; 0;}memmove(g_snake&＃43;1,g_snake,sizeof(Point)*(g_nLength-1));//移动蛇的中间数据g_snake[0].r &＃61; newHead.r;g_snake[0].c &＃61; newHead.c;//添加蛇头数据g_map[g_snake[0].r][g_snake[0].c] &＃61; 3;//
}void render()//画面渲染
{HDC hDC &＃61; GetDC(getHWnd()); //获得系统绘图设备HDC memDC &＃61; CreateCompatibleDC(0); //创建辅助绘图设备HBITMAP bmpBack &＃61; CreateCompatibleBitmap(hDC,g_nWidth,g_nHeight);//创建掩码位图&＃xff08;画布&＃xff09;SelectObject(memDC,bmpBack); //将画布贴到绘图设备上HPEN penBack &＃61; CreatePen(PS_SOLID,1,RGB(255,0,255));//创建画笔SelectObject(memDC,penBack); //将画笔选到绘图设备上//擦除背景RECT rcClient;//区域结构GetClientRect(getHWnd(),&rcClient);//获得客户区域HBRUSH brushTemp &＃61; (HBRUSH)GetStockObject(WHITE_BRUSH);//获得库存物体&＃xff0c;白色画刷。FillRect(memDC,&rcClient,brushTemp);//填充客户区域。////绘制2维网格&＃xff0c;矩形画法。for (int r&＃61;0; r}void clear()//资源释放
{//释放画刷资源for (int i&＃61;0; i<4; &＃43;&＃43;i){if(g_brushs !&＃61; NULL){DeleteObject(g_brushs[i]);g_brushs[i] &＃61; NULL;}}
}/*窗口过程。如果没有处理消息请返回0&＃xff0c;否则返回1。*/
LRESULT wndProc(HWND hwnd,UINT uMsg, WPARAM wParam,LPARAM lParam )
{switch(uMsg){case WM_KEYDOWN:{switch(wParam){case VK_LEFT: setSnakeDir(0); break; //向左case VK_RIGHT: setSnakeDir(1); break; //向右case VK_UP : setSnakeDir(2); break; //向上case VK_DOWN: setSnakeDir(3); break; //向下case VK_ESCAPE: DestroyWindow(hwnd);break;}}break;default:return 0;}return 1;
}//主函数
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE , LPSTR , int )
{if(!initApp(hInstance,L"贪吃蛇游戏",g_nWidth,g_nHeight)){return 0;}//初始化游戏init();//游戏循环mainLoop();//释放资源clear();return 0;
}