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Код

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;


    HBRUSH hBrush, hOldBrush;
    HRGN RoundBall;
    BOOL Down = false;
    BOOL Up = false;

POINT point[2] = {{20, 20},{60, 60}};
RECT RoundBallRect = {point[0].x, point[0].y, point[1].x, point[1].y};
RECT RectangleField = {20, 20, 350, 450};
    


    switch (message)
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // Parse the menu selections:
        switch (wmId)
        {
        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            break;
        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        case IDC_BUTTON1:
            SetTimer(hWnd, 1, 250, NULL);
            break;
        case IDC_BUTTON2:
            KillTimer(hWnd, 1);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        
        hBrush = CreateSolidBrush(RGB(255, 200, 255));
        hOldBrush = (HBRUSH)SelectObject(hdc, hBrush);

        Rectangle(hdc, 20, 20, 350, 450);
        SelectObject(hdc,hOldBrush);
        DeleteObject(hBrush);

        hBrush = CreateHatchBrush(HS_DIAGCROSS,RGB(0, 255, 128));
        hOldBrush = (HBRUSH)SelectObject(hdc, hBrush);

        RoundBall = CreateEllipticRgnIndirect(&RoundBallRect);
        FillRgn(hdc, RoundBall, hBrush);
        SelectObject(hdc,hOldBrush);
        DeleteObject(hBrush);
        
        EndPaint(hWnd, &ps);
        break;
    case WM_TIMER:
        
        if (Down)
        {
            Down = true;
        }

        else
        {
        
            while (Down);
            {
                if (RoundBallRect.top == 100)
                {
                    Down = true;
                    Up = false;
                }

                else
                {
                    RoundBallRect.top+=10;
                    RoundBallRect.bottom+=10;
                    Up = true;
                }
            }
        }
        if (Up)
        {
            Up = true;
        }

        else
        {
            while (Up);
            {
                if (RoundBallRect.bottom == 20)
                {
                    Up = true;
                    Down = false;
                }
                else
                {
                    RoundBallRect.top-=10;
                    RoundBallRect.bottom-=10;
                    Down = true;
                    //Up = false;
                }
            }
        }
        
        
        InvalidateRect(hWnd, &RoundBallRect, TRUE);
        InvalidateRect(hWnd, &RectangleField, TRUE);
        break;