>_<:compared with the previous article,this one only adds key-message listener.
>_<:up down left right control the roal movement.
1 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) 2 { 3 int wmId, wmEvent; 4 PAINTSTRUCT ps; 5 6 switch (message) 7 { 8 case WM_KEYDOWN: 9 switch(wParam) 10 { 11 case VK_UP: 12 y-=20; 13 if(y<0)y+=480; 14 break; 15 case VK_DOWN: 16 y=(y+20)%480; 17 break; 18 case VK_LEFT: 19 speed-=10; 20 if(speed<0)speed=0; 21 SetTimer(hWnd,1,speed,NULL); 22 break; 23 case VK_RIGHT: 24 speed+=10; 25 if(speed>300)speed=300; 26 SetTimer(hWnd,1,speed,NULL); 27 break; 28 } 29 break; 30 case WM_TIMER: 31 MyPaint(hdc); 32 break; 33 case WM_COMMAND: 34 wmId = LOWORD(wParam); 35 wmEvent = HIWORD(wParam); 36 // 分析菜单选择: 37 switch (wmId) 38 { 39 case IDM_EXIT: 40 DestroyWindow(hWnd); 41 break; 42 default: 43 return DefWindowProc(hWnd, message, wParam, lParam); 44 } 45 break; 46 case WM_PAINT: 47 hdc = BeginPaint(hWnd, &ps); 48 // TODO: 在此添加任意绘图代码... 49 EndPaint(hWnd, &ps); 50 break; 51 case WM_DESTROY: 52 DeleteDC(mdc); 53 ReleaseDC(hWnd,hdc); 54 DeleteObject(bg); 55 DeleteObject(dra); 56 KillTimer(hWnd,1); 57 PostQuitMessage(0); 58 break; 59 default: 60 return DefWindowProc(hWnd, message, wParam, lParam); 61 } 62 return 0; 63 }
StdAfx.h
resourse.h
#include "stdafx.h" #include "resourse.h" #define MAX_LOADSTRING 100 // Global Variables: HINSTANCE hInst; // current instance TCHAR szTitle[MAX_LOADSTRING]; // The title bar text TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text HBITMAP dra,bg;//背景和恐龙 HDC hdc,mdc,bufdc;//窗口DC.存储贴到窗口上的内容并透明处理.选取位图用的DC HWND hWnd; DWORD tPre,tNow,tCheck; int x,y,num,speed=200;//恐龙坐标 // Foward declarations of functions included in this code module: ATOM MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM); void MyPaint(HDC hdc); //======================================================================================== int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { // TODO: Place code here. MSG msg; MyRegisterClass(hInstance);//调用函数向系统注册窗口类别，输入参数hInstance是目前运行程序的对象代码； // 调用InitInstance函数，进行初始化操作； if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } // 消息循环（通过消息循环来获取信息， //进行必要的键盘信息转换而后将控制权交给操作系统， //有操作系统决定哪个程序的消息处理函数处理消息 while (msg.message!=WM_QUIT) //不是窗口结束消息WM_QUIT,则继续循环 { if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))//PeekMessage()函数来检测目前是否有消息处理(检测到0，否则1) { //------------|不能用GetMassage()换，因为它只有取得WM_QUIT时才返回0，其他返回非0，错误返回-1 TranslateMessage(&msg);//转换伪码及字符 DispatchMessage(&msg);//将控制权交给系统，再有系统决定负责处理消息的程序； } else//当此次循环运行与上次绘图时间相差0.1秒时再进行重绘操作 { tNow=GetTickCount();//取得从开始到现在运行的时间百万分之一秒 if(tNow-tPre>=200)MyPaint(hdc); //tPre前次绘图的时间；计算上次绘图到这次循环之间的时间 } //------------|若相差100个单位进行一次绘图操作，通过这 } //------------|个操作可以调整运行快慢 return msg.wParam; } //===================================================================================== //============================================================================================= //在建立程序窗口实体之前，必须先定义一个窗口类别，其中包含所要建立窗口的信息， //并向系统注册，这里的MyRegisterClass函数就是进行定义及注册窗口类别的函数。 //============================================================================================== ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASSEX wcex; //申请一个窗口类别“WNDCLASSEX”和结构”wcex“ //-------------------------------------------------------------- //定义vcex结构的各项信息，其中设定信息处理函数（lpfnWndProc） //为WNDPROC，类别名称为（lpszClassName）为”fe"; //-------------------------------------------------------------- wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = (WNDPROC)WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = NULL; wcex.hCursor = NULL; wcex.hCursor = LoadCursor(NULL,IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wcex.lpszMenuName = NULL; wcex.lpszClassName = "fe"; wcex.hIconSm = NULL; return RegisterClassEx(&wcex);//调用RegisterClassEx函数注册类别，返回一个“ATOM"形态的字符串 //此字符串即为类别名称”fe"; } //============================================================================================ //============================================================================================ //按照前面所定义的窗口类别来建立并显示实际的程序窗口 //============================================================================================ BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { char filename[20]=""; HBITMAP bmp; hInst = hInstance; // 把instance handle 储存在全局变量中； hWnd = CreateWindow("fe","绘图窗口",WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); //----------------------------------------------- //调用CreateWindow函数来建立一个窗口对象 //第一个参数就是窗口建立依据的类别名称 //----------------------------------------------- if (!hWnd) { return FALSE; } //------------------------------------------------ //设定窗口的位置及窗口的大小，然后绘制显示在设备上 //------------------------------------------------- MoveWindow(hWnd,10,10,640,480,true);//位置及大小 ShowWindow(hWnd, nCmdShow);//改定窗口显示时的状态 UpdateWindow(hWnd);//将窗口绘制在显示设备上 hdc=GetDC(hWnd); mdc=CreateCompatibleDC(hdc); bufdc=CreateCompatibleDC(hdc); bmp=CreateCompatibleBitmap(hdc,640,480);//后面的位图处理是在bmp中进行 SelectObject(mdc,bmp); dra=(HBITMAP)LoadImage(NULL,"dra.bmp",IMAGE_BITMAP,760,200,LR_LOADFROMFILE); bg=(HBITMAP)LoadImage(NULL,"bg.bmp",IMAGE_BITMAP,640,480,LR_LOADFROMFILE); num=0; x=500;//起始坐标 y=300; SetTimer(hWnd,1,200,NULL); MyPaint(hdc); return TRUE; } //============================================================================================ //============================================================================================ // //============================================================================================ void MyPaint(HDC hdc) { if(num==8)num=0; if(tNow-tCheck>=200)//判断此次绘图时间由前一秒算起是否已经达到1秒钟的时间间隔 { tCheck=tNow;//并重设下一次起始时间 } SelectObject(bufdc,bg);//在mdc上贴上背景图 BitBlt(mdc,0,0,640,480,bufdc,0,0,SRCCOPY); SelectObject(bufdc,dra);//在mdc上透明处理 BitBlt(mdc,x,y,100,100,bufdc,num*100,100,SRCAND); BitBlt(mdc,x,y,100,100,bufdc,num*100,0,SRCPAINT); BitBlt(hdc,0,0,640,480,mdc,0,0,SRCCOPY);//将最后的画面显示在窗口上 tPre=GetTickCount();//记录此次绘图的时间 num++; x-=20;//记录下次贴图的坐标 if(x<=-95)x=640; } //============================================================================================ //============================================================================================ //在前面定义类别的时候把WndProc定义为消息处理函数（当某些外部消息发生时，会按消息的类型 //来决定该如何进行处理。此外该函数也是一个回叫函数（CALLBACK)（windows系统函数）每一个 //程序都会接收信息，选择性接受、处理； //============================================================================================ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { int wmId, wmEvent; PAINTSTRUCT ps; switch (message) { case WM_KEYDOWN: switch(wParam) { case VK_UP: y-=20; if(y<0)y+=480; break; case VK_DOWN: y=(y+20)%480; break; case VK_LEFT: speed-=10; if(speed<0)speed=0; SetTimer(hWnd,1,speed,NULL); break; case VK_RIGHT: speed+=10; if(speed>300)speed=300; SetTimer(hWnd,1,speed,NULL); break; } break; case WM_TIMER: MyPaint(hdc); break; case WM_COMMAND: wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // 分析菜单选择: switch (wmId) { case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } break; case WM_PAINT: hdc = BeginPaint(hWnd, &ps); // TODO: 在此添加任意绘图代码... EndPaint(hWnd, &ps); break; case WM_DESTROY: DeleteDC(mdc); ReleaseDC(hWnd,hdc); DeleteObject(bg); DeleteObject(dra); KillTimer(hWnd,1); PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } //============================================================================================
