C++ 공튀기기

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg,

    WPARAM wParam, LPARAM lParam);

void CALLBACK TimerProc(HWND hwnd, UINT msg, UINT id, DWORD time);

void DrawCircle(HDC hdc, POINT pt)

{

    Ellipse(hdc, pt.x - 10, pt.y - 10, pt.x + 10, pt.y + 10);

}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,

    LPSTR lpszCmdLine, int nCmdShow)

{

    HWND hwnd;

    MSG msg;

    WNDCLASS WndClass;

    WndClass.style = CS_HREDRAW | CS_VREDRAW;

    WndClass.lpfnWndProc = WndProc;

    WndClass.cbClsExtra = 0;

    WndClass.cbWndExtra = 0;

    WndClass.hInstance = hInstance;

    WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);

    WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

    WndClass.lpszMenuName = NULL;

    WndClass.lpszClassName = "Window Class Name";

    RegisterClass(&WndClass);

    hwnd = CreateWindow("Window Class Name",

        "Window Title Name",

        WS_OVERLAPPEDWINDOW,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        NULL,

        NULL,

        hInstance,

        NULL

    );

    ShowWindow(hwnd, nCmdShow);

    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, 0, 0))

    {

        TranslateMessage(&msg);

        DispatchMessage(&msg);

    }

    return (int)msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg,

    WPARAM wParam, LPARAM lParam)

{

    HDC hdc;

    PAINTSTRUCT ps;

    static bool bTimer = false;

    static RECT client_rect;

    static POINT circle;

    static int x_increase;

    static int y_increase;

    switch (iMsg)

    {

    case WM_CREATE:

        srand(GetTickCount());

        break;

    case WM_TIMER:

    {

        circle.x += x_increase;

        circle.y += y_increase;

        if (circle.x <= 0 || circle.x >= client_rect.right)

            x_increase = -x_increase;

        if (circle.y <= 0 || circle.y >= client_rect.bottom)

            y_increase = -y_increase;

        InvalidateRect(hwnd, NULL, TRUE);

    }

    break;

    case WM_SIZE:

        GetClientRect(hwnd, &client_rect);

        circle.x = LOWORD(lParam) / 2;

        circle.y = HIWORD(lParam) / 2;

        break;

    case WM_LBUTTONDOWN:

    {

        if (bTimer == false)

        {

            if (rand() % 2)//렌드가 홀수면 양수

            {

                x_increase = rand() % 10;

            }

            else//렌드가 짝수면 음수

            {

                x_increase = -rand() % 10;

            }

            if (rand() % 2)//렌드가 홀수면 양수

            {

                y_increase = rand() % 10;

            }

            else//렌드가 짝수면 음수

            {

                y_increase = -rand() % 10;

            }

            SetTimer(hwnd, 1, 1, NULL);

        }

        else

        {

            KillTimer(hwnd, 1);

        }

        bTimer ^= true;

    }

    break;

    case WM_PAINT:

        hdc = BeginPaint(hwnd, &ps);

        DrawCircle(hdc, circle);

        EndPaint(hwnd, &ps);

        break;

    case WM_DESTROY:

        PostQuitMessage(0);

        break;

    }

    return DefWindowProc(hwnd, iMsg, wParam, lParam);

}