Windows 7 Pro process of rolling windows sine curv

/ / by transferring the origin of coordinates to attain the sine curve, the array elements can minimize the mobile
/ / two * NUM, but to open up area for the array.
# incorporate
# consist of

# outline ID_TIMER 1
# outline NUM 1000
# define Stage 10 / / Every action of relocating
# define TWOPI (2 * three.14159)

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain ( ; HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName [] = TEXT (hwnd;
MSG msg;
WNDCLASS wndclass;

wndclass.style ; = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbCl######tra = 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 = szAppName;

if (! RegisterClass (& wndclass))

MessageBox (NULL, TEXT (szAppName, MB_ICONERROR);
return 0;


hwnd = CreateWindow (szAppName , TEXT (CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance,Windows 7 Pro, NULL);
ShowWindow (hwnd, iCmdShow);
UpdateWindow (hwnd);

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

TranslateMessage ( & msg);
DispatchMessage (& msg);

return msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxClient, cyClient;
HDC ; hdc;
int i;
PAINTSTRUCT ps;
static POINT apt [2 * NUM];
static HPEN hPen1, hPen2;
static int step;

switch (message)
{
case WM_SIZE:
cxClient = LOWORD (lParam);
cyClient = HIWORD (lParam);

for (i = 0; i <2 * NUM; i + +)

apt [i]. x = (int) (i * cxClient / NUM);
apt [i]. y = (int) (cyClient * (1 - sin (TWOPI * i / NUM)) / 2);

return 0;
case WM_CREATE:
hPen1 = CreatePen (PS_SOLID, 4, RGB (255,0,0));