游戏编程笔记-起步

3.贪吃蛇游戏实现

代码下载：http://download.csdn.net/detail/you_lan_hai/3738025

核心代码实现如下，算法描述见 “起步（一）”：

#include "app.h"
#include <string.h>
#include <stdlib.h>int g_map[100][100];//2维地图int g_nWidth = 610; //窗口宽度
int g_nHeight = 514;//窗口高度int g_rows = 0;     //地图行数
int g_cols = 0;     //地图列数
int g_nSize = 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 = 0;  //蛇的长度
int     g_nSpeed;
bool    g_bLive = true; //是否存活
int     g_nSnakeDir = 0;    //蛇的当前移动方向。0-左，1-右，2-上，3-下const Point g_direction[4] = {{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 = 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==0 && g_nSnakeDir==1)|| (dir==1 && g_nSnakeDir==0)|| (dir==2 && g_nSnakeDir==3)|| (dir==3 && g_nSnakeDir==2))//反方向移动则令他暂停{g_bPause = true;return;//直接返回，什么也不做。}else{g_bPause = false;g_nSnakeDir = dir;}
}void resetLevel()//重置关卡
{/*初始化地图。将四边初始为障碍，即不可通过。* 0-可通过，1-障碍，2-奖子，3-蛇*/memset(g_map,0,sizeof(g_map));for (int r=0; r<g_rows; ++r){g_map[r][0] = 1;g_map[r][g_cols-1] = 1;}for (int c=0; c<g_cols; ++c){g_map[0][c] = 1;g_map[g_rows-1][c] = 1;}g_nSpeed = 500;g_bPause = true;//暂停g_nSnakeDir = 1;//向右。g_bLive = true;g_nLength = 3;//蛇初始有3个结点g_snake[0].r = 1;//蛇头g_snake[0].c = 3;g_snake[1].r = 1;g_snake[1].c = 2;g_snake[2].r = 1;g_snake[2].c = 1;//把初始状态写入地图for (int i=0; i<g_nLength; ++i){g_map[g_snake[i].r][g_snake[i].c] = 3;}//初始化奖子坐标g_prizePos.r = 1;g_prizePos.c = g_cols-2;
}void init()//游戏初始化
{g_brushs[0] = CreateSolidBrush(RGB(255,255,255));//白色画刷g_brushs[1] = CreateSolidBrush(RGB(0,0,255));//绘制障碍画刷g_brushs[2] = CreateSolidBrush(RGB(255,0,0));//绘制奖子画刷g_brushs[3] = 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 = rc.right - rc.left;g_nHeight = rc.bottom - rc.top;//计算行列值g_rows = g_nHeight / g_nSize;g_cols = g_nWidth / g_nSize;resetLevel();
}void update()//逻辑更新
{//时钟控制static int oldTime = 0;int curTime = GetTickCount();if (curTime - oldTime < g_nSpeed){return ;}oldTime = curTime;//static int lastOcurTime = 0;//奖子上次出现的时间if(curTime - lastOcurTime > 10000)//每隔10s更新一次位置。{//lastOcurTime不为-1表示，没有被吃掉，则将原来位置的奖子从地图擦掉。if (lastOcurTime != -1){g_map[g_prizePos.r][g_prizePos.c] = 0;}lastOcurTime = curTime;//随机产生奖子位置。bool flag = true;while(flag){g_prizePos.r = rand()%(g_rows-2)+1;g_prizePos.c = rand()%(g_cols-2)+1;if (g_map[g_prizePos.r][g_prizePos.c] == 0)//符合条件{flag = false;g_map[g_prizePos.r][g_prizePos.c] = 2;}}}if (!g_bLive || g_bPause)//死亡或暂停{return ;}//先判断是否可走，即是否撞死。Point newHead;newHead.r = g_snake[0].r + g_direction[g_nSnakeDir].r;newHead.c = g_snake[0].c + g_direction[g_nSnakeDir].c;if (g_map[newHead.r][newHead.c]==1 || g_map[newHead.r][newHead.c]==3){g_bLive = false;if(IDYES == MessageBox(getHWnd(),L"你撞死啦！是否重新来过？",L"撞死提示",MB_YESNO)){resetLevel();}else{PostQuitMessage(0);}return ;}else if (g_map[newHead.r][newHead.c] == 2)//遇到奖子{++g_nLength ;lastOcurTime = -1;g_nSpeed -= 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] = 0;}memmove(g_snake+1,g_snake,sizeof(Point)*(g_nLength-1));//移动蛇的中间数据g_snake[0].r = newHead.r;g_snake[0].c = newHead.c;//添加蛇头数据g_map[g_snake[0].r][g_snake[0].c] = 3;//
}void render()//画面渲染
{HDC hDC = GetDC(getHWnd());       //获得系统绘图设备HDC memDC = CreateCompatibleDC(0);   //创建辅助绘图设备HBITMAP bmpBack = CreateCompatibleBitmap(hDC,g_nWidth,g_nHeight);//创建掩码位图（画布）SelectObject(memDC,bmpBack);  //将画布贴到绘图设备上HPEN penBack = 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 = (HBRUSH)GetStockObject(WHITE_BRUSH);//获得库存物体，白色画刷。FillRect(memDC,&rcClient,brushTemp);//填充客户区域。////绘制2维网格，矩形画法。for (int r=0; r<g_rows; ++ r){for (int c=0; c<g_cols; ++c){SelectObject(memDC,g_brushs[g_map[r][c]]);Rectangle(memDC,c*g_nSize,r*g_nSize,(c+1)*g_nSize,(r+1)*g_nSize);}}//BitBlt(hDC,0,0,g_nWidth,g_nHeight,memDC,0,0,SRCCOPY);//复制到系统设备上显示DeleteObject(penBack);  //释放画笔资源DeleteObject(bmpBack);  //释放位图资源DeleteDC(memDC);      //释放辅助绘图设备ReleaseDC(getHWnd(),hDC); //归还系统绘图设备Sleep(10);
}void clear()//资源释放
{//释放画刷资源for (int i=0; i<4; ++i){if(g_brushs != NULL){DeleteObject(g_brushs[i]);g_brushs[i] = NULL;}}
}/*窗口过程。如果没有处理消息请返回0，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;
}