我设的定时器为什么没有用呀

LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
        PAINTSTRUCT ps;
        HDC hdc;
        static HICON Speople, Apoint, Bpoint;
        static POINT people;
        Speople=LoadIcon(hInst,MAKEINTRESOURCE(IDI_ICON3));
        Apoint=LoadIcon(hInst,MAKEINTRESOURCE(IDI_ICON1));
        Bpoint=LoadIcon(hInst,MAKEINTRESOURCE(IDI_ICON2));
    switch(uMsg)
    {
    case WM_CREATE:
        {
            people.x=23;
            people.y=23;
        }
        break;
    case WM_PAINT:
        {
        hdc=BeginPaint(hwnd,&ps);
        Hdc=BeginPaint(hwnd,&ps);
        DrawIcon(hdc,people.x,people.y,Speople);
        DrawIcon(hdc,53,23,Apoint);
        DrawIcon(hdc,800,23,Bpoint);

        while (people.x<=800)
        {
        people.x=people.x+30;
        DrawIcon(hdc,people.x,people.y,Speople);
        SetTimer(hwnd,1,1000,NULL);
        }

        EndPaint(hwnd,&ps);
        }
        break;
    case WM_CLOSE:
        KillTimer(hwnd,1);
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);
    }
    return 0;
}
为什么不是间隔1S出来一张图片？怎么一下子全出来了？这是为什么呀？本人菜鸟，求指点！