マウス movemont を使用して、ビットマップをマウス カーソル位置に bitblt しようとしていますが、ちらつきの問題があります。
ちらつきを減らすためのダブルバッファリングについて読んだことがありますが、方法がわかりません...これにより極端なちらつきが発生します。ちらつきを減らすためのダブルバッファリングについて読んだことがありますが、この例でそれを実装する方法がわかりません。助けてください。ありがとう
以下にコードを示します。ご協力ありがとうございます。
// screen blinks.trying to use double buffer so solve this problem.
#include <windows.h>
HDC bufferDC = NULL;
HDC hdc=GetWindowDC(NULL) ;
HDC hammerDC = NULL;
HBITMAP hammer1BMP = NULL;
HBITMAP bufferBMP = NULL;
POINT cursorpoint;
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("DigClock") ;
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 = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("Program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Digital Clock"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
bufferDC=CreateCompatibleDC(hdc);
hammerDC=CreateCompatibleDC(hdc);
hammer1BMP=(HBITMAP)LoadImage(NULL,"star.bmp",IMAGE_BITMAP,160,160,LR_LOADFROMFILE);
SelectObject(hammerDC,hammer1BMP);
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 f24Hour, fSuppress ;
static HBRUSH hBrushRed ;
static int cxClient, cyClient ;
HDC hdc ;
PAINTSTRUCT ps ;
TCHAR szBuffer [2] ;
switch (message)
{
case WM_CREATE:
hBrushRed = CreateSolidBrush (RGB (255, 0, 0)) ;
SetTimer (hwnd, ID_TIMER, 1000/24,NULL) ;//1000
// fall through
case WM_SETTINGCHANGE:
InvalidateRect (hwnd, NULL, TRUE) ;
return 0 ;
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_TIMER:
InvalidateRect (hwnd, NULL, TRUE) ;
return 0 ;
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
bufferBMP=CreateCompatibleBitmap(hdc,cxClient,cyClient);
SelectObject(bufferDC,bufferBMP);
// SelectObject(bufferDC,hammer1BMP);
GetCursorPos(&cursorpoint);
BitBlt(bufferDC,0,0,cxClient,cyClient,hammerDC,0,0,SRCCOPY);
BitBlt(hdc,cursorpoint.x,cursorpoint.y,cxClient,cyClient,bufferDC,0,0,SRCCOPY);
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_LBUTTONDOWN:
// GetCursorPos(&cursorpoint);
//BitBlt(hdc,cursorpoint.x,cursorpoint.y,cxClient,cyClient,hammerDC,0,0,SRCCOPY);
return 0;
case WM_DESTROY:
KillTimer (hwnd, ID_TIMER) ;
DeleteDC(hammerDC);
DeleteObject (hBrushRed) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}