[游戏模版20] Win32 物理引擎 加速运动

>_<:Compared with previous talk,there will be taking about how to create an accelerated speed.Only a little change in the MyPaint(...) function.

>_<:resource

>_<:code

 #include <windows.h>
 // C 运行时头文件
 #include <stdlib.h>
 #include <cstdio>
 #include <malloc.h>
 #include <memory.h>
 #include <tchar.h>
 #include <time.h>
 #include <string>
 #include <cmath>

 // 全局变量:
 HINSTANCE hInst;                                // 当前实例
 HBITMAP bg , ball[];
 HDC hdc,mdc,bufdc;
 HWND hWnd;
 RECT rect;//窗口矩形
 int x[] , y[];//位置
 int vx[] , vy[];//速度
 int ax[] , ay[];//加速度
 int t=;//时间

 // 此代码模块中包含的函数的前向声明:
 ATOM                MyRegisterClass(HINSTANCE hInstance);
 BOOL                InitInstance(HINSTANCE, int);
 LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
 INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
 void                MyPaint(HDC hdc);

 int APIENTRY _tWinMain(HINSTANCE hInstance,
                      HINSTANCE hPrevInstance,
                      LPTSTR    lpCmdLine,
                      int       nCmdShow){

     MSG msg;
     MyRegisterClass(hInstance);
     // 执行应用程序初始化:
     if (!InitInstance (hInstance, nCmdShow)){
         return FALSE;
     }
     // 主消息循环:
     while (GetMessage(&msg, NULL, , )){
         TranslateMessage(&msg);
         DispatchMessage(&msg);
     }
     return (int) msg.wParam;
 }

 //  函数: MyRegisterClass()
 //
 //  目的: 注册窗口类。
 ATOM MyRegisterClass(HINSTANCE hInstance){
     WNDCLASSEX wcex;

     wcex.cbSize = sizeof(WNDCLASSEX);

     wcex.style            = CS_HREDRAW | CS_VREDRAW;
     wcex.lpfnWndProc    = WndProc;
     wcex.cbClsExtra        = ;
     wcex.cbWndExtra        = ;
     wcex.hInstance        = hInstance;
     wcex.hIcon            = NULL;
     wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
     wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+);
     wcex.lpszMenuName    = "Beautifulzzzz";
     wcex.lpszClassName    = "Beautifulzzzz";
     wcex.hIconSm        = NULL;

     return RegisterClassEx(&wcex);
 }

 //
 //   函数: InitInstance(HINSTANCE, int)
 //
 //   目的: 保存实例句柄并创建主窗口
 //
 //   注释:
 //
 //        在此函数中，我们在全局变量中保存实例句柄并
 //        创建和显示主程序窗口。
 //        棋盘拼接以及调用InitGame()开始棋局
 BOOL InitInstance(HINSTANCE hInstance, int nCmdShow){
    HBITMAP bmp;
    hInst = hInstance; // 将实例句柄存储在全局变量中

    hWnd = CreateWindow("Beautifulzzzz","Beautifulzzzz", WS_OVERLAPPEDWINDOW,
       CW_USEDEFAULT, , CW_USEDEFAULT, , NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
       return FALSE;
    }

    MoveWindow(hWnd,,,,,true);
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    hdc=GetDC(hWnd);
    mdc=CreateCompatibleDC(hdc);
    bufdc=CreateCompatibleDC(hdc);

    bmp=CreateCompatibleBitmap(hdc,,);
    SelectObject(mdc,bmp);

    bg=(HBITMAP)LoadImageA(NULL,"bg.bmp",IMAGE_BITMAP,,,LR_LOADFROMFILE);
    ball[]=(HBITMAP)LoadImageA(NULL,"ball0.bmp",IMAGE_BITMAP,,,LR_LOADFROMFILE);
    ball[]=(HBITMAP)LoadImageA(NULL,"ball1.bmp",IMAGE_BITMAP,,,LR_LOADFROMFILE);

    GetClientRect(hWnd,&rect);//取得内部窗口区域的大小；

    x[]=;y[]=;vx[]=;vy[]=;ax[]=;ay[]=;
    x[]=;y[]=;vx[]=-;vy[]=-;ax[]=;ay[]=;

    SetTimer(hWnd,,,NULL);
    MyPaint(hdc);

    return TRUE;
 }

 //
 //  函数: WndProc(HWND, UINT, WPARAM, LPARAM)
 //
 //  目的: 处理主窗口的消息。
 //
 //  WM_COMMAND    - 处理应用程序菜单
 //  WM_PAINT    - 绘制主窗口
 //  WM_DESTROY    - 发送退出消息并返回
 //
 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){
     int wmId, wmEvent;
     PAINTSTRUCT ps;

     switch (message){
     case WM_TIMER:
         A:MyPaint(hdc);
         break;
     case WM_PAINT:
         hdc = BeginPaint(hWnd, &ps);
         goto A;// TODO: 在此添加任意绘图代码...
         EndPaint(hWnd, &ps);
         break;
     case WM_DESTROY:
         DeleteDC(mdc);
         DeleteDC(bufdc);
         DeleteObject(bg);
         DeleteObject(ball[]);
         DeleteObject(ball[]);

         KillTimer(hWnd,);
         ReleaseDC(hWnd,hdc);

         PostQuitMessage();
         break;
     default:
         return DefWindowProc(hWnd, message, wParam, lParam);
     }
     return ;
 }

 //MyPaint()
 //1、窗口贴图
 //2、计算小球贴图坐标并判断小球是否碰撞窗口边缘
 void MyPaint(HDC hdc){
     SelectObject(bufdc,bg);
     BitBlt(mdc,,,,,bufdc,,,SRCCOPY);

     SelectObject(bufdc,ball[]);
     BitBlt(mdc,x[],y[],,,bufdc,,,SRCAND);
     BitBlt(mdc,x[],y[],,,bufdc,,,SRCPAINT);

     SelectObject(bufdc,ball[]);
     BitBlt(mdc,x[],y[],,,bufdc,,,SRCAND);
     BitBlt(mdc,x[],y[],,,bufdc,,,SRCPAINT);

     BitBlt(hdc,,,,,mdc,,,SRCCOPY);

     for(int i=;i<;i++){
     //计算x轴方向贴图坐标与速度
         vx[i]+=t*ax[i];
         x[i]+=vx[i];
         if(x[i]<=){
             x[i]=;
             vx[i]=-vx[i];
         }else if(x[i]>=rect.right-){
             x[i]=rect.right-;
             vx[i]=-vx[i];
         }

         //计算y轴方向坐标及速度
         vy[i]+=t*ay[i];
         y[i]+=vy[i];
         if(y[i]<=){
             y[i]=;
             vy[i]=-vy[i];
         }else if(y[i]>=rect.bottom-){
             y[i]=rect.bottom-;
             vy[i]=-vy[i];
         }
     }
     if((x[]-x[])*(x[]-x[])+(y[]-y[])*(y[]-y[])<=){
         vx[]=-vx[];vy[]=-vy[];
         vx[]=-vx[];vy[]=-vy[];

     }
 }