Code:
#include<windows.h>
#define ID_TIMER 101
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Invalidaterect") ;
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 (BLACK_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
return 0 ;
}
hwnd = CreateWindow (szAppName, // window class name
TEXT ("The Hello Program"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL) ; // creation parameters
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 BOOL bFlipFlop = FALSE ;
HDC hdc ;
PAINTSTRUCT ps ;
RECT rect ;
HBRUSH hBrush, brDiagonal;
POINT points [7] = {{20, 50},{180, 50},{180, 20},{230, 70},
{180, 120},{180, 90},{20, 90}};
int cpt = 7 ;
switch (message)
{
case WM_CREATE:
SetTimer (hwnd, ID_TIMER, 1000, NULL);
break;
case WM_TIMER :
bFlipFlop = !bFlipFlop ;
rect.left = 15;
rect.top = 15;
rect.right = 235;
rect.bottom = 125;
InvalidateRect (hwnd, &rect, FALSE) ;
return 0 ;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect);
hBrush = CreateSolidBrush (bFlipFlop ? RGB(255,0,0) :
RGB(0,0,255)) ;
FillRect (hdc, &rect, hBrush) ;
Polygon(hdc, points, cpt);
brDiagonal = CreateHatchBrush (bFlipFlop ? HS_FDIAGONAL :
HS_BDIAGONAL, bFlipFlop ? RGB(0,0,255) :RGB(255,0,0)) ;
SelectObject(hdc, brDiagonal);
Polygon(hdc, points, cpt);
DeleteObject(brDiagonal);
DeleteObject (hBrush) ;
EndPaint(hwnd, &ps);
return 0 ;
case WM_DESTROY:
KillTimer (hwnd, ID_TIMER) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}