windows编程：画线，简单的碰撞检测，简单的帧率锁定

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include <windowsx.h>

#include <mmsystem.h>

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#define WINDOW_CLASS_NAME "WINCLASS1"

#define WINDOW_WIDTH  640

#define WINDOW_HEIGHT 480

#define KEYDOWN(vk_code)    ((GetAsyncKeyState(vk_code) & 0x8000) ? 1:0)

#define KEYUP(vk_code)        ((GetAsyncKeyState(vk_code) & 0x8000) ? 0:1)

//全局变量

HWND main_window_handle = NULL;

HINSTANCE hInstance_App = NULL;

char buffer[];

//窗口处理函数

LRESULT CALLBACK WindowProc(HWND hwnd,

    UINT msg,

    WPARAM wParam,

    LPARAM lPram)

{

    PAINTSTRUCT ps;

    HDC hdc;

    RECT rect;

    char buffer[];

    switch (msg)

    {

    case WM_CREATE:

    {

                      return ;

    }break;

    case WM_PAINT:

    {

                     hdc = GetDC(hwnd);

                     ReleaseDC(hwnd, hdc);

                     GetClientRect(hwnd, &rect);

                     ValidateRect(hwnd, &rect);

                     return ;

    }break;

    case WM_CLOSE:

    {

                     if (IDYES != MessageBox(hwnd, "确实要退出应用程序？", "退出", MB_YESNO | MB_ICONEXCLAMATION))

                     {

                         return ;

                     }

                     else

                     {

                         PostQuitMessage();

                     }

    }break;

    case WM_SIZE:

    {

    }break;

    case WM_DESTROY:

    {

                       PostQuitMessage();

                       return ;

    }break;

    default:break;

    }

    return DefWindowProc(hwnd, msg, wParam, lPram);

}

void GameMain()

{

    return;

}

int WINAPI WinMain(HINSTANCE hInstance,

    HINSTANCE hPrevInstance,

    LPSTR lpCmdLine,

    int nCmdShow)

{

    //定义窗口类

    WNDCLASSEX winClass;

    HWND hWnd;

    MSG msg;

    HPEN pen = NULL;

    int color_change_count = ;

    //填充窗口类的各成员

    winClass.cbSize = sizeof(WNDCLASSEX);

    winClass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;

    winClass.lpfnWndProc = WindowProc;    //窗口消息处理函数

    winClass.cbClsExtra = ;

    winClass.cbWndExtra = ;

    winClass.hInstance = hInstance;

    winClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    winClass.hCursor = LoadCursor(NULL, IDC_ARROW);

    winClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);

    winClass.lpszMenuName = NULL;

    winClass.lpszClassName = WINDOW_CLASS_NAME;        //窗口类名

    winClass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    //保存实例句柄到全局变量

    hInstance_App = hInstance;

    //注册窗口类

    if (!RegisterClassEx(&winClass))

    {

        return ;

    }

    //创建窗口类的一个成员

    if (!(hWnd = CreateWindowEx(NULL,

        WINDOW_CLASS_NAME,

        "时间锁定的屏幕保护程序",

        WS_OVERLAPPEDWINDOW | WS_VISIBLE,

        , ,

        WINDOW_WIDTH, WINDOW_HEIGHT,

        NULL,

        NULL,

        hInstance,

        NULL)))

    {

        return ;

    }

    //保存窗体句柄到全局变量中

    main_window_handle = hWnd;

    //得到设备上下文

    HDC hdc = GetDC(hWnd);

    //设置随机数生成器的种子

    srand(GetTickCount());

    //线段终点坐标

    int x1 = rand() % WINDOW_WIDTH;

    int y1 = rand() % WINDOW_HEIGHT;

    int x2 = rand() % WINDOW_WIDTH;

    int y2 = rand() % WINDOW_HEIGHT;

    //线段终点的速度

    int x1v = - + rand() % ;

    int y1v = - + rand() % ;

    int x2v = - + rand() % ;

    int y2v = - + rand() % ;

    //消息循环

    while (TRUE)

    {

        DWORD start_time = GetTickCount();

        if (PeekMessage(&msg, hWnd, , , PM_REMOVE))

        {

            if (msg.message == WM_QUIT)

            {

                break;

            }

            TranslateMessage(&msg);

            DispatchMessage(&msg);

        }

        //100次变换一次颜色

        if (++color_change_count >= )

        {

            color_change_count = ;

            if (pen)

            {

                DeleteObject(pen);

            }

            pen = CreatePen(PS_SOLID, , RGB(rand() % , rand() % , rand() % ));

            SelectObject(hdc, pen);

        }

        //移动线段终点

        x1 += x1v;

        y1 += y1v;

        x2 += x2v;

        y2 += y2v;

        //碰撞检测，看是否碰到窗体的边界

        if (x1< || x1>WINDOW_WIDTH)

        {

            x1v = -x1v;

            x1 += x1v;

        }

        if (y1< || y1>WINDOW_HEIGHT)

        {

            y1v = -y1v;

            y1 += y1v;

        }

        if (x2< || x2>WINDOW_WIDTH)

        {

            x2v = -x2v;

            x2 += x2v;

        }

        if (y2< || y2>WINDOW_HEIGHT)

        {

            y2v = -y2v;

            y2 += y2v;

        }

        MoveToEx(hdc, x1, y1,NULL);

        LineTo(hdc, x2, y2);

        //锁定帧率为30fps,1/30秒，约等于33毫秒。

        while (GetTickCount() - start_time < );

        //如果用户按了ESC，发送WM_CLOSE消息。退出程序。

        if (KEYDOWN(VK_ESCAPE))

            SendMessage(hWnd, WM_CLOSE, , );

    }

    ReleaseDC(hWnd, hdc);

    return msg.wParam;

}

windows编程：画线，简单的碰撞检测，简单的帧率锁定的相关教程结束。