C++实现贪吃蛇

1

新建工程，这里新建的是单文档程序，然后一步步按照图示来，就能把工程建好了。这里注意的是一定要建立的是单文档程序

2

新建贪吃蛇类，CSnakeGame，这个类实现贪吃蛇的大部分功能，包含，初始化贪吃蛇，生成食物的位置，eat一个实物，向上下左右四个方向，next是下一步。代码如下// SnakeGame.h: interface for the CSnakeGame class.////////////////////////////////////////////////////////////////////////#if !defined(AFX_SNAKEGAME_H__074FBCE0_CE02_48E4_978F_AF89899F85A5__INCLUDED_)#define AFX_SNAKEGAME_H__074FBCE0_CE02_48E4_978F_AF89899F85A5__INCLUDED_#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000#include struct Point{ int x; int y; Point():x(0),y(0){} Point(int _x,int _y):x(_x),y(_y){}};class CSnakeGame {public: Point head; Point food; int direct; // 0 down 1 up 2 left 3 right CArray arr ; CSnakeGame(); virtual ~CSnakeGame(); void InitGame(){ head.x = 4 ; head.y = 4 ; arr.RemoveAll() ; AddHead() ; GenerateFood() ; } void AddHead(){arr.Add(head);} void Left(){if(direct!=3)direct = 2 ;} void Right(){if(direct!=2)direct = 3 ;} void Up(){if(direct!=0)direct = 1 ;} void Down(){if(direct!=1)direct = 0 ;} bool Next(){ head = arr.ElementAt(0) ; switch(direct){ case 0: head.x+=1; break; case 1: head.x-=1; break; case 2: head.y-=1; break; case 3: head.y+=1; break; } if(IsOver(head))return false ; if(head.x == food.x && head.y == food.y) { eat(); GenerateFood() ; }else{ arr.InsertAt(0,head) ; arr.RemoveAt(arr.GetSize()-1) ; } return true ; } bool IsOver(Point head){ if(head.x<0||head.x>=10||head.y<0||head.y>=10)return true ; return false ; } void eat(){ arr.InsertAt(0,food) ; } void GenerateFood(){ food.x = rand() % 10 ; food.y = rand() % 10 ; } };#endif // !defined(AFX_SNAKEGAME_H__074FBCE0_CE02_48E4_978F_AF89899F85A5__INCLUDED_)

3

然后就是编写界面和实现响应函数了，界面部分就是注意添加一个菜单，按照图中的说明，添加好菜单项的属性ID等信息。在通过类向导添加每个菜单项的响应函数。如图所示。添加定时器相应函数，添加KeyUp和keydown响应函数

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实现相应的响应函数代码，整个程序就基本完成了。下面是全部的实现代码SnakeView.cpp// SnakeView.cpp : implementation of the CSnakeView class//#include 'stdafx.h'#include 'Snake.h'#include 'SnakeDoc.h'#include 'SnakeView.h'#include 'SnakeGame.h'#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endifCSnakeGame snakeGame ;/////////////////////////////////////////////////////////////////////////////// CSnakeViewIMPLEMENT_DYNCREATE(CSnakeView, CView)BEGIN_MESSAGE_MAP(CSnakeView, CView) //{{AFX_MSG_MAP(CSnakeView) ON_COMMAND(ID_MENUITEM_START, OnMenuitemStart) ON_WM_TIMER() ON_WM_KEYUP() ON_WM_KEYDOWN() ON_COMMAND(ID_MENUITEM_STOP, OnMenuitemStop) ON_COMMAND(ID_MENUITEM_GOON, OnMenuitemGoon) //}}AFX_MSG_MAP // Standard printing commands ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CSnakeView construction/destructionCSnakeView::CSnakeView(){ // TODO: add construction code here my_start = false ; my_gameOver = false ; my_stop = false ; WhiteBrush.CreateSolidBrush(RGB(255,255,255)); BlackBrush.CreateSolidBrush(RGB(0,0,0)); GreenBrush.CreateSolidBrush(RGB(0,255,0)); RedBrush.CreateSolidBrush(RGB(255,0,0)); YellowBrush.CreateSolidBrush(RGB(255,255,0)); datas = new int[10][10] ;}CSnakeView::~CSnakeView(){}BOOL CSnakeView::PreCreateWindow(CREATESTRUCT& cs){ // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs return CView::PreCreateWindow(cs);}/////////////////////////////////////////////////////////////////////////////// CSnakeView drawingvoid CSnakeView::OnDraw(CDC* pDC){ CSnakeDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); // TODO: add draw code for native data here if(my_start){ RECT rect ; GetClientRect(&rect) ; //pDC->FillRect(&rect,&GreenBrush) ; InitFace(pDC); } }/////////////////////////////////////////////////////////////////////////////// CSnakeView printingBOOL CSnakeView::OnPreparePrinting(CPrintInfo* pInfo){ // default preparation return DoPreparePrinting(pInfo);}void CSnakeView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/){ // TODO: add extra initialization before printing}void CSnakeView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/){ // TODO: add cleanup after printing}/////////////////////////////////////////////////////////////////////////////// CSnakeView diagnostics#ifdef _DEBUGvoid CSnakeView::AssertValid() const{ CView::AssertValid();}void CSnakeView::Dump(CDumpContext& dc) const{ CView::Dump(dc);}CSnakeDoc* CSnakeView::GetDocument() // non-debug version is inline{ ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CSnakeDoc))); return (CSnakeDoc*)m_pDocument;}#endif //_DEBUG/////////////////////////////////////////////////////////////////////////////// CSnakeView message handlersvoid CSnakeView::OnMenuitemStart() { // TODO: Add your command handler code here my_start = true ; my_gameOver = false ; snakeGame.InitGame() ; Invalidate(TRUE) ;}void CSnakeView::InitFace(CDC* pDC){ CDC *cdc = this->GetDC(); CDC MemDC; //首先定义一个显示设备对象 CBitmap MemBitmap;//定义一个位图对象 CRect crect; this->GetClientRect(crect); MemDC.CreateCompatibleDC(NULL);//随后建立与屏幕显示兼容的内存显示设备 //下面建立一个与屏幕显示兼容的位图，至于位图的大小嘛，可以用窗口的大小 MemBitmap.CreateCompatibleBitmap(cdc, main_rect.right-main_rect.left, main_rect.bottom-main_rect.top); //将位图选入到内存显示设备中 //只有选入了位图的内存显示设备才有地方绘图，画到指定的位图上 CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap); //先用背景色将位图清除干净,颜色自选 MemDC.FillSolidRect(0,0, main_rect.right-main_rect.left, main_rect.bottom-main_rect.top,RGB(255,255,255)); //这里加入自己的画图代码，此时画图都是在内存中完成，操作对象是MemDC //然后将内存中的图拷贝到屏幕上进行显示 RECT rect ; CBrush* brush ; for(int i = 0 ; i < 10 ;i ++) { for(int j = 0 ; j < 10 ;j++){ rect.left = uWidth * j - 1; rect.top = uHeight * i - 1; rect.right = rect.left + uWidth -1 ; rect.bottom = rect.top + uHeight -1 ; if(datas[i][j] == 0 )brush = &BlackBrush ; else if(datas[i][j] == 1)brush = &GreenBrush ; else if(datas[i][j] == 2)brush = &RedBrush ; else if(datas[i][j] == 3)brush = &YellowBrush ; MemDC.FillRect(&rect,brush) ; } } cdc->BitBlt(0,0, crect.Width(), crect.Height(),&MemDC,0, 0,SRCCOPY); //绘图完成后清理临时对象 MemBitmap.DeleteObject(); MemDC.DeleteDC();}void CSnakeView::OnInitialUpdate() { CView::OnInitialUpdate(); GetClientRect(&main_rect) ; uWidth = (main_rect.right - main_rect.left) / 10; uHeight = (main_rect.bottom - main_rect.top) / 10; InitArr(datas,10,10) ; SetTimer(1,1000,NULL) ;}void CSnakeView::InitArr(int (*datas) [10],int x,int y){ for(int i = 0 ; i < x ; i++) { for(int j = 0 ; j < y ; j++){ datas[i][j] = 0 ; } }}void CSnakeView::GetPicMap(){ InitArr(datas,10,10) ; int len = snakeGame.arr.GetSize() ; for(int i = 0 ; i < len ; i++ ){ Point p = snakeGame.arr.GetAt(i) ; datas[p.x][p.y] = 1 ; } datas[snakeGame.head.x][snakeGame.head.y] = 2 ; datas[snakeGame.food.x][snakeGame.food.y] = 3 ;}void CSnakeView::drawOver(){ CDC* pcd = this->GetDC(); CString str = 'GAME OVER' ; CRect rect ; rect.left = main_rect.Width() / 2 - 100; rect.top = main_rect.Height() / 2 - 100; rect.right = main_rect.Width() / 2; rect.bottom = main_rect.Height() / 2; pcd->DrawText(str,rect, 0) ;}void CSnakeView::OnTimer(UINT nIDEvent) { // TODO: Add your message handler code here and/or call default if(nIDEvent == 1){ if(my_start && !my_gameOver && !my_stop){ my_gameOver = !snakeGame.Next() ; if(my_gameOver){ drawOver(); return ;} GetPicMap() ; Invalidate() ; } } CView::OnTimer(nIDEvent);}void CSnakeView::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) { // TODO: Add your message handler code here and/or call default switch(nChar){ case VK_UP: snakeGame.Up() ; break; case VK_LEFT: snakeGame.Left() ; break; case VK_RIGHT: snakeGame.Right() ; break; case VK_DOWN: snakeGame.Down() ; break; } CView::OnKeyUp(nChar, nRepCnt, nFlags);}void CSnakeView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) { if(my_gameOver){ drawOver(); return ;} // TODO: Add your message handler code here and/or call default if(my_gameOver){ drawOver(); return ;} switch(nChar){ case VK_UP: snakeGame.Up() ; break; case VK_LEFT: snakeGame.Left() ; break; case VK_RIGHT: snakeGame.Right() ; break; case VK_DOWN: snakeGame.Down() ; break; } my_gameOver = !snakeGame.Next() ; GetPicMap(); Invalidate() ; if(my_gameOver){ drawOver(); return ;} CView::OnKeyDown(nChar, nRepCnt, nFlags);}void CSnakeView::OnMenuitemStop() { // TODO: Add your command handler code here my_stop = true ;}void CSnakeView::OnMenuitemGoon() { // TODO: Add your command handler code here my_stop = false ;}

5

最后就是调试运行了，结果图如下

欧尼酱

C++实现贪吃蛇

C/C++中define编译预处理的用法