[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[2];
HDC hdc,mdc,bufdc;
HWND hWnd;
RECT rect;//窗口矩形
int x[2] , y[2];//位置
int vx[2] , vy[2];//速度
int ax[2] , ay[2];//加速度
int t=3;//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, 0, 0)){
        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        = 0;
    wcex.cbWndExtra        = 0;
    wcex.hInstance        = hInstance;
    wcex.hIcon            = NULL;
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1);
    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, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   MoveWindow(hWnd,10,10,600,450,true);
   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

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

   bmp=CreateCompatibleBitmap(hdc,600,480);
   SelectObject(mdc,bmp);

   bg=(HBITMAP)LoadImageA(NULL,"bg.bmp",IMAGE_BITMAP,640,480,LR_LOADFROMFILE);
   ball[0]=(HBITMAP)LoadImageA(NULL,"ball0.bmp",IMAGE_BITMAP,52,26,LR_LOADFROMFILE);
   ball[1]=(HBITMAP)LoadImageA(NULL,"ball1.bmp",IMAGE_BITMAP,52,26,LR_LOADFROMFILE);

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

   x[0]=50;y[0]=50;vx[0]=4;vy[0]=4;ax[0]=0;ay[0]=2;
   x[1]=380;y[1]=380;vx[1]=-4;vy[1]=-4;ax[1]=0;ay[1]=0;

   SetTimer(hWnd,1,10,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[0]);
        DeleteObject(ball[1]);

        KillTimer(hWnd,1);
        ReleaseDC(hWnd,hdc);

        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

//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,0,0,640,480,bufdc,0,0,SRCCOPY);

    SelectObject(bufdc,ball[0]);
    BitBlt(mdc,x[0],y[0],26,26,bufdc,26,0,SRCAND);
    BitBlt(mdc,x[0],y[0],26,26,bufdc,0,0,SRCPAINT);

    SelectObject(bufdc,ball[1]);
    BitBlt(mdc,x[1],y[1],26,26,bufdc,26,0,SRCAND);
    BitBlt(mdc,x[1],y[1],26,26,bufdc,0,0,SRCPAINT);

    BitBlt(hdc,0,0,640,480,mdc,0,0,SRCCOPY);

    for(int i=0;i<2;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]<=0){
            x[i]=0;
            vx[i]=-vx[i];
        }else if(x[i]>=rect.right-26){
            x[i]=rect.right-26;
            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]<=0){
            y[i]=0;
            vy[i]=-vy[i];
        }else if(y[i]>=rect.bottom-26){
            y[i]=rect.bottom-26;
            vy[i]=-vy[i];
        }
    }
    if((x[0]-x[1])*(x[0]-x[1])+(y[0]-y[1])*(y[0]-y[1])<=1000){
        vx[0]=-vx[0];vy[0]=-vy[0];
        vx[1]=-vx[1];vy[1]=-vy[1];

    }
}